General Motors (GM) 10-K 4 Feb 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document (USD $)	12 Months Ended
In Billions, except Share data, unless otherwise specified	Dec. 31, 2014	Jan. 28, 2015	Jun. 30, 2014
Document Entity Information [Abstract]
Entity Registrant Name	GENERAL MOTORS COMPANY
Entity Central Index Key	1467858
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Document Period End Date	31-Dec-14
Amendment Flag	FALSE
Entity Common Stock, Shares Outstanding		1,610,365,961
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$58.20

Consolidated_Income_Statements

Consolidated Income Statements (USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net sales and revenue
Automotive	$151,092	$152,092	$150,295
GM Financial	4,837	3,335	1,961
Total	155,929	155,427	152,256
Costs and expenses
Automotive cost of sales	138,082	134,925	140,236
GM Financial operating and other expenses	4,039	2,448	1,207
Automotive selling, general and administrative expense	12,158	12,382	14,031
Goodwill impairment charges	120	541	27,145
Total costs and expenses	154,399	150,296	182,619
Operating income (loss)	1,530	5,131	-30,363
Automotive interest expense	1,829	1,049	772
Interest income and other non-operating income, net	823	1,063	845
Gain (loss) on extinguishment of debt	202	-212	-250
Equity income	2,094	1,810	1,562
Income (loss) before income taxes	4,246	7,458	-28,695
Income tax expense (benefit)	228	2,127	-34,831
Net income	4,018	5,331	6,136
Net (income) loss attributable to noncontrolling interests	-69	15	52
Net income attributable to stockholders	3,949	5,346	6,188
Net income attributable to common stockholders	2,804	3,770	4,859
Basic Earnings per Common Share
Basic earnings per common share	$1.75	$2.71	$3.10
Weighted-average common shares outstanding	1,605	1,393	1,566
Diluted Earnings per Common Share
Diluted earnings per common share	$1.65	$2.38	$2.92
Weighted-average common shares outstanding	1,687	1,676	1,675
Automotive [Member]
Costs and expenses
Goodwill impairment charges	120	541
Automotive interest expense	403	334	489
Gain (loss) on extinguishment of debt	$202	($212)	($250)

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income	$4,018	$5,331	$6,136
Other comprehensive income (loss), net of tax
Foreign currency translation adjustments	-473	-733	-103
Cash flow hedging losses, net	0	0	-2
Unrealized gains (losses) on securities, net	-5	-39	45
Defined benefit plans, net	-4,505	5,693	-2,120
Other comprehensive income (loss), net of tax	-4,983	4,921	-2,180
Comprehensive income (loss)	-965	10,252	3,956
Comprehensive (income) loss attributable to noncontrolling interests	-46	33	41
Comprehensive income (loss) attributable to stockholders	($1,011)	$10,285	$3,997

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
ASSETS
Cash and cash equivalents	$18,954	$20,021
Marketable securities	9,222	8,972
Restricted cash and marketable securities	1,338	1,247
Accounts and notes receivable, net	9,078	8,535
Inventories	13,642	14,039
Equipment on operating leases, net	3,564	2,398
Deferred income taxes	9,760	10,349
Other current assets	1,584	1,662
Total current assets	83,670	81,501
Restricted cash and marketable securities	935	829
Equity in net assets of nonconsolidated affiliates	8,350	8,094
Property, net	27,743	25,867
Goodwill	1,427	1,560
Intangible assets, net	4,983	5,668
Deferred income taxes	25,414	22,736
Other assets	2,089	2,352
Total non-current assets	94,007	84,843
Total Assets	177,677	166,344
LIABILITIES AND EQUITY
Accounts payable (principally trade)	22,529	23,621
Accrued liabilities	28,184	24,633
Total current liabilities	65,701	62,412
Postretirement benefits other than pensions	6,229	5,897
Pensions	23,788	19,483
Other liabilities	14,082	13,353
Total non-current liabilities	75,952	60,758
Total Liabilities	141,653	123,170
Commitments and contingencies
Common stock, $0.01 par value	16	15
Additional paid-in capital	28,937	28,780
Retained earnings	14,577	13,816
Accumulated other comprehensive loss	-8,073	-3,113
Total stockholders' equity	35,457	42,607
Noncontrolling interests	567	567
Total Equity	36,024	43,174
Total Liabilities and Equity	177,677	166,344
Series A Preferred Stock [Member]
LIABILITIES AND EQUITY
Series A preferred stock, $0.01 par value	0	3,109
Total Equity	0	3,109
Automotive [Member]
ASSETS
Goodwill	0	138
LIABILITIES AND EQUITY
Short-term debt and current portion of long-term debt	500	564
Long-term debt	8,910	6,573
GM Financial [Member]
ASSETS
GM Financial receivables, net, current	16,528	14,278
GM Financial receivables, net, noncurrent	16,006	14,354
Goodwill	1,427	1,422
GM Financial equipment on operating leases, net	7,060	3,383
LIABILITIES AND EQUITY
Short-term debt and current portion of long-term debt	14,488	13,594
Long-term debt	$22,943	$15,452

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets Parenthetical (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, except Per Share data, unless otherwise specified
Common Stock, Par Value	$0.01	$0.01
Automotive [Member]
Allowance for accounts and notes receivable	$340	$344
GM Financial [Member]
Finance receivables at VIEs - current	16,528	14,278
Finance receivables at VIEs - noncurrent	16,006	14,354
Operating lease assets at VIEs	7,060	3,383
Consolidated VIE [Member] | GM Financial [Member]
Finance receivables at VIEs - current	11,134	10,001
Finance receivables at VIEs - noncurrent	11,583	11,216
Operating lease assets at VIEs	4,595	1,803
Debt at VIEs	22,794	19,448
Consolidated VIE [Member] | Short-term Debt [Member] | GM Financial [Member]
Debt at VIEs	10,502	10,088
Consolidated VIE [Member] | Long-term Debt [Member] | GM Financial [Member]
Debt at VIEs	$12,292	$9,330
Series A Preferred Stock [Member]
Preferred Stock, Par Value	$0.01	$0.01

Consolidated_Statements_Of_Cas

Consolidated Statements Of Cash Flows (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities
Net income	$4,018	$5,331	$6,136
Depreciation, amortization and impairment charges	7,238	8,041	38,762
Foreign currency remeasurement and transaction losses	437	350	117
Amortization of discount and issuance costs on debt issues	181	114	188
Undistributed earnings of nonconsolidated affiliates and gains on investments	-301	-92	-179
Pension contributions and OPEB payments	-1,315	-1,458	-3,759
Pension and OPEB expense, net	439	638	3,232
(Gains) losses on extinguishment of debt	-202	212	250
Provision (benefit) for deferred taxes	-574	1,561	-35,561
Change in other operating assets and liabilities	244	-1,326	630
Other operating activities	-107	-741	789
Net cash provided by operating activities	10,058	12,630	10,605
Cash flows from investing activities
Expenditures for property	-7,091	-7,565	-8,068
Available-for-sale marketable securities, acquisitions	-7,636	-6,754	-4,650
Trading marketable securities, acquisitions	-1,518	-3,214	-6,234
Available-for-sale marketable securities, liquidations	6,874	3,566	10,519
Trading marketable securities, liquidations	1,881	6,538	7,267
Acquisition of companies, net of cash acquired	-53	-2,623	-44
Proceeds from sale of business units/investments, net of cash disposed	0	896	18
Increase in restricted cash and marketable securities	-839	-984	-661
Decrease in restricted cash and marketable securities	515	1,107	1,526
Purchase of finance receivables	-14,744	-10,838	-6,122
Principal collections and recoveries on finance receivables	10,860	7,555	4,007
Purchases of leased vehicles, net	-4,776	-2,254	-1,050
Proceeds from termination of leased vehicles	533	217	59
Other investing activities	296	-9	-72
Net cash used in investing activities	-15,698	-14,362	-3,505
Cash flows from financing activities
Net increase (decrease) in short-term debt	391	156	-247
Proceeds from issuance of debt (original maturities greater than three months)	31,373	28,041	9,036
Payments on debt (original maturities greater than three months)	-19,524	-20,191	-7,377
Payments to purchase stock	-3,277	-2,438	-5,098
Dividends paid (including charge related to redemption and purchase of Series A preferred stock)	-3,165	-1,687	-939
Other financing activities	-123	-150	-116
Net cash provided by (used in) financing activities	5,675	3,731	-4,741
Effect of exchange rate changes on cash and cash equivalents	-1,102	-400	-8
Net increase (decrease) in cash and cash equivalents	-1,067	1,599	2,351
Cash and cash equivalents at beginning of period	20,021	18,422	16,071
Cash and cash equivalents at end of period	18,954	20,021	18,422
Investing Cash Flows
Non-cash property additions	3,313	3,224	3,879
Financing Cash Flows
Mandatory conversion of Series B Preferred Stock into common stock			1
Series B Preferred Stock [Member]
Financing Cash Flows
Mandatory conversion of Series B Preferred Stock into common stock		$4,854

Consolidated_Statements_Of_Equ

Consolidated Statements Of Equity (USD $)	Total	Series A Preferred Stock [Member]	Series B Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Noncontrolling Interests [Member]
In Millions
Balance at Dec. 31, 2011	$38,991	$5,536	$4,855	$16	$26,391	$7,183	($5,861)	$871
Net income	6,136					6,188		-52
Other comprehensive income (loss)	-2,180						-2,191	11
Purchase and retirement of common stock	-5,109			-2	-2,652	-2,455
Exercise of common stock warrants	5				5
Stock based compensation	89				89
Conversion of Series B Preferred Stock into common stock	1				1
Cash dividends on Series A Preferred Stock and cumulative dividends on Series B Preferred Stock	-859					-859
Dividends declared or paid to noncontrolling interest	-80							-80
Other	6							6
Balance at Dec. 31, 2012	37,000			14	23,834	10,057	-8,052	756
Balance at Nov. 30, 2012
Purchase and retirement of common stock				-5,100
Balance at Dec. 31, 2012	37,000	5,536	4,855	14	23,834	10,057	-8,052	756
Net income	5,331					5,346		-15
Other comprehensive income (loss)	4,921						4,939	-18
Purchase/Redemption and cancellation of Series A Preferred Stock	-2,427	-2,427
Exercise of common stock warrants	3				3
Stock based compensation	75				75
Conversion of Series B Preferred Stock into common stock			4,854	1	4,854
Mandatory conversion of Series B Preferred Stock into common stock	0		-4,855
Cash dividends paid on Series A Preferred Stock and charge related to purchase/redemption of Series A Preferred Stock and dividends on Series B Preferred Stock	-1,587					-1,587
Dividends declared or paid to noncontrolling interest	-82							-82
Other	-60				14			-74
Balance at Dec. 31, 2013	43,174	3,109	0	15	28,780	13,816	-3,113	567
Net income	4,018					3,949		69
Other comprehensive income (loss)	-4,983						-4,960	-23
Purchase/Redemption and cancellation of Series A Preferred Stock	-3,109	-3,109
Purchase of common stock	-168				-85	-83
Exercise of common stock warrants	39			1	38
Stock based compensation	189				206	-17
Cash dividends paid on Series A Preferred Stock and charge related to purchase/redemption of Series A Preferred Stock and dividends on Series B Preferred Stock	-1,160					-1,160
Cash dividends paid on common stock	-1,928					-1,928
Dividends declared or paid to noncontrolling interest	-73							-73
Other	25				-2			27
Balance at Dec. 31, 2014	$36,024	$0		$16	$28,937	$14,577	($8,073)	$567

Nature_Of_Operations_and_Basis

Nature Of Operations and Basis of Presentation	12 Months Ended
	Dec. 31, 2014
Nature of Operations and Basis of Presentation [Abstract]
Nature of Operations and Basis of Presentation [Text Block]	Nature of Operations and Basis of Presentation
	General Motors Company was incorporated as a Delaware corporation in 2009. We design, build and sell cars, trucks and automobile parts worldwide. We also provide automotive financing services through GM Financial. We analyze the results of our business through the following segments: GMNA, GME, GMIO, GMSA and GM Financial. Nonsegment operations are classified as Corporate. Corporate includes certain centrally recorded income and costs, such as interest, income taxes and corporate expenditures and certain nonsegment specific revenues and expenses.
	As discussed in Note 13 we announced recalls of approximately 42 million vehicles and recorded charges of approximately $2.9 billion in Automotive cost of sales relating to recall campaigns and courtesy transportation in the year ended December 31, 2014 and as discussed in Note 17 we announced the creation of a compensation program related to faulty ignition switches on certain vehicles and recorded a charge of $400 million in the three months ended June 30, 2014.
	Principles of Consolidation
	The consolidated financial statements are prepared in conformity with U.S. GAAP. All intercompany balances and transactions have been eliminated in consolidation. Certain prior year amounts were reclassified to conform to our current year presentation. In the three months ended March 31, 2014 we changed our managerial and financial reporting structure to reclassify the results of our Russian subsidiaries previously reported in our GMIO segment to our GME segment. We have retrospectively revised the segment presentation for all periods presented. Refer to Note 25 for additional information on our segment reporting.
	We consolidate entities that we control due to ownership of a majority voting interest and we consolidate variable interest entities (VIEs) when we have variable interests and are the primary beneficiary. We continually evaluate our involvement with VIEs to determine when these criteria are met. Our share of earnings or losses of nonconsolidated affiliates is included in our consolidated operating results using the equity method of accounting when we are able to exercise significant influence over the operating and financial decisions of the affiliate. We use the cost method of accounting if we are not able to exercise significant influence over the operating and financial decisions of the affiliate.
	Use of Estimates in the Preparation of the Financial Statements
	Accounting estimates are an integral part of the consolidated financial statements. These estimates require the use of judgments and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses in the periods presented. We believe that the accounting estimates employed are appropriate and the resulting balances are reasonable; however, due to the inherent uncertainties in making estimates actual results could differ from the original estimates, requiring adjustments to these balances in future periods.
	Change in Accounting Estimate
	We historically accrued estimated costs related to recall campaigns in GMNA when they are probable and reasonably estimable, which typically occurs once it is determined a specific recall campaign is needed and announced. During the three months ended June 30, 2014, following the significant increase in the number of vehicles subject to recall in GMNA, the results of our ongoing comprehensive safety review, additional engineering analysis, the creation of a new Global Product Integrity organization, the appointment of a new Global Vice President of Vehicle Safety responsible for the safety development of our vehicle systems and our overall commitment to customer satisfaction, we accumulated sufficient historical data in GMNA to support the use of an actuarial-based estimation technique for recall campaigns. As such we now accrue at the time of vehicle sale in GMNA the costs for recall campaigns. Based on expanded historical data, we recorded a catch-up adjustment of $874 million in Automotive cost of sales in the three months ended June 30, 2014 to adjust the estimate for recall costs for previously sold vehicles. In other geographical regions the historical claims data did not support the application of an actuarial-based model; therefore, recall campaigns are accrued when probable and reasonably estimable, which typically occurs once it is determined a specific recall campaign is needed and announced.
	GM Financial
	The amounts presented for GM Financial have been adjusted to include the effect of our tax attributes on GM Financial's deferred tax positions and provision for income taxes since the date of acquisition, which are not applicable to GM Financial on a stand-alone basis, and to eliminate the effect of transactions between GM Financial and the other members of the consolidated group. Accordingly, the amounts presented will differ from those presented by GM Financial on a stand-alone basis.

Significant_Accounting_Policie

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]	Significant Accounting Policies
	The accounting policies which follow are utilized by our automotive and automotive financing operations, unless otherwise indicated.
	Revenue Recognition
	Automotive
	Automotive net sales and revenue are primarily composed of revenue generated from the sale of vehicles. Vehicle sales are recorded when title and all risks and rewards of ownership have passed to our customers. For the majority of our automotive sales this occurs when a vehicle is released to the carrier responsible for transporting to a dealer and when collectability is reasonably assured. Vehicle sales are recorded when the vehicle is delivered to the dealer in most remaining cases. Provisions for recurring or announced dealer and customer sales and leasing incentives, consisting of allowances and rebates, are recorded as reductions to Automotive net sales and revenue at the time of vehicle sales. All other incentives, allowances and rebates related to vehicles previously sold are recorded as reductions to Automotive net sales and revenue when announced.
	Vehicle sales to daily rental car companies with guaranteed repurchase obligations are accounted for as operating leases. Estimated lease revenue is recorded ratably over the estimated term of the lease based on the difference between net sales proceeds and the guaranteed repurchase amount. The difference between the cost of the vehicle and estimated residual value is depreciated on a straight-line basis over the estimated term of the lease.
	Automotive Financing - GM Financial
	Finance charge income earned on receivables is recognized using the effective interest method for consumer financing receivables and accrual method for commercial financing receivables. Fees and commissions (including incentive payments) received and direct costs of originating loans are deferred and amortized over the term of the related finance receivables using the effective interest method and are removed from the consolidated balance sheets when the related finance receivables are sold, charged off or paid in full. Accrual of finance charge income on consumer finance receivables is generally suspended on accounts that are more than 60 days delinquent, accounts in bankruptcy and accounts in repossession. Payments received on nonaccrual loans are first applied to any fees due, then to any interest due and then any remaining amounts are recorded to principal. Interest accrual generally resumes once an account has received payments bringing the delinquency to less than 60 days past due. Accrual of finance charge income on commercial finance receivables is generally suspended on accounts that are more than 90 days delinquent, upon receipt of a bankruptcy notice from a borrower, or where reasonable doubt about the full collectability of contractually agreed upon principal and interest exist. Payments received on nonaccrual loans are first applied to principal. Interest accrual resumes once an account has received payments bringing the account fully current and collection of contractual principal and interest is reasonably assured (including amounts previously charged-off) or, for troubled debt restructurings (TDRs), when repayment is reasonably assured based on the modified terms of the loan.
	Income from operating lease assets, which includes lease origination fees, net of lease origination costs and incentives, is recorded as operating lease revenue on a straight-line basis over the term of the lease agreement.
	Advertising and Promotion Expenditures
	Advertising and promotion expenditures, which are expensed as incurred in Automotive selling, general and administrative expense, were $5.2 billion, $5.5 billion and $5.4 billion in the years ended December 31, 2014, 2013 and 2012.
	Research and Development Expenditures
	Research and development expenditures, which are expensed as incurred in Automotive cost of sales, were $7.4 billion, $7.2 billion and $7.4 billion in the years ended December, 31 2014, 2013 and 2012.
	Cash Equivalents
	Cash equivalents are defined as short-term, highly-liquid investments with original maturities of 90 days or less.
	Allowance for Doubtful Accounts
	We record an allowance for doubtful accounts based on our best estimate of recoverability of receivables. Charges related to the allowance for doubtful accounts are recorded in Automotive selling, general and administrative expense. The following table summarizes activity in our allowance for doubtful accounts and notes receivable related to our automotive operations (dollars in millions):
		Years Ended December 31,
		2014			2013			2012
	Balance at beginning of period	$	344		$	311		$	331
	Amounts charged (credited) to costs and expenses	50			61			(10		)
	Deductions	(8		)	(24		)	(46		)
	Effect of foreign currency and other	(46		)	(4		)	36
	Balance at end of period	$	340		$	344		$	311
	Fair Value Measurements
	A three-level valuation hierarchy, based upon observable and unobservable inputs, is used for fair value measurements. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect market assumptions based on the best evidence available. These two types of inputs create the following fair value hierarchy:
	•	Level 1 - Quoted prices for identical instruments in active markets;
	•	Level 2 - Quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active and model-derived valuations whose significant inputs are observable; and
	•	Level 3 - Instruments whose significant inputs are unobservable.
	Financial instruments are transferred in and/or out of Level 1, 2 or 3 at the beginning of the accounting period in which there is a change in the valuation inputs.
	Marketable Securities
	We classify marketable securities as available-for-sale or trading. Various factors, including turnover of holdings and investment guidelines, are considered in determining the classification of securities. Available-for-sale securities are recorded at fair value with unrealized gains and losses recorded net of related income taxes in Accumulated other comprehensive loss until realized. Trading securities are recorded at fair value with changes in fair value recorded in Interest income and other non-operating income, net. We determine realized gains and losses for all securities using the specific identification method.
	We measure the fair value of our marketable securities using a market approach where identical or comparable prices are available and an income approach in other cases. If quoted market prices are not available, fair values of securities are determined using prices from a pricing service, pricing models, quoted prices of securities with similar characteristics or discounted cash flow models. These prices represent non-binding quotes. Our pricing service utilizes industry-standard pricing models that consider various inputs. We conduct an annual review of our pricing service. Based on our review we believe the prices received from our pricing service are a reliable representation of exit prices.
	An evaluation is made quarterly to determine if unrealized losses related to non-trading investments in securities are other-than-temporary. Factors considered in determining whether a loss on a marketable security is other-than-temporary include: (1) the length of time and extent to which the fair value has been below cost; (2) the financial condition and near-term prospects of the issuer; and (3) the intent to sell or likelihood to be forced to sell the security before any anticipated recovery.
	Finance Receivables
	As the result of our October 2010 acquisition of GM Financial and GM Financial's acquisition of the Ally Financial international operations, finance receivables are reported in two portfolios: pre-acquisition and post-acquisition portfolios. The pre-acquisition finance receivables portfolio consists of finance receivables that were considered to have had deterioration in credit quality at the time they were acquired with the acquisitions of GM Financial or the Ally Financial international operations. The pre-acquisition portfolio will decrease over time with the amortization of the acquired receivables. The post-acquisition finance receivables portfolio consists of finance receivables that were considered to have had no deterioration in credit quality at the time they were acquired with the acquisition of the Ally Financial international operations and finance receivables originated since the acquisitions of GM Financial and the Ally Financial international operations. The post-acquisition portfolio is expected to grow over time as GM Financial originates new receivables.
	Pre-Acquisition Consumer Finance Receivables
	At the time of acquisitions the receivables were recorded at fair value. The pre-acquisition finance receivables were acquired at a discount, which contains two components: a non-accretable difference and an accretable yield. The accretable yield is recorded as finance charge income over the life of the acquired receivables.
	Any deterioration in the performance of the pre-acquisition finance receivables from their expected performance will result in an incremental provision for loan losses. Improvements in the performance of the pre-acquisition finance receivables will result first in the reversal of any incremental related allowance for loan losses and then in a transfer of the excess from the non-accretable difference to accretable yield, which will be recorded as finance charge income over the remaining life of the receivables.
	Post-Acquisition Consumer Finance Receivables and Allowance for Loan Losses
	Post-acquisition finance receivables originated since the acquisitions of GM Financial and the Ally Financial international operations are carried at amortized cost, net of allowance for loan losses.
	The component of the allowance for consumer finance receivables that is collectively evaluated for impairment is based on a statistical calculation supplemented by management judgment. GM Financial uses a combination of forecasting models to determine the allowance for loan losses. Factors that are considered when estimating the allowance include loss confirmation period, historical delinquency migration to loss, probability of default and loss given default. The loss confirmation period is a key assumption within the models, which represents the average amount of time from when a loss event first occurs to when the receivable is charged-off.
	Consumer finance receivables that become classified as TDRs are separately assessed for impairment. A specific allowance is estimated based on the present value of the expected future cash flows of the receivable discounted at the loan's original effective interest rate.
	Consumer finance receivables are generally charged off in the month in which the account becomes 120 days contractually delinquent if we have not yet recorded a repossession charge-off. A charge-off generally represents the difference between the estimated net sales proceeds and the amount of the contract, including accrued interest.
	The finance receivables acquired with the Ally Financial international operations that were considered to have no deterioration in credit quality at the time of acquisition were recorded at fair value. The purchase discount will accrete to income over the life of the receivables, based on contractual cash flows, using the effective interest method. Provisions for loan losses are charged to operations in amounts equal to net credit losses for the period. Any subsequent deterioration in the performance of the acquired receivables will result in an incremental provision for loan losses.
	Inventory
	Inventories are stated at the lower of cost or market. Market, which represents selling price less cost to sell, considers general market and economic conditions, periodic reviews of current profitability of vehicles, product warranty costs and the effect of current and expected incentive offers at the balance sheet date. Market for off-lease and other vehicles is current auction sales proceeds less disposal and warranty costs. Productive material, work in process, supplies and service parts are reviewed to determine if inventory quantities are in excess of forecasted usage or if they have become obsolete.
	Equipment on Operating Leases, net
	Equipment on operating leases, net is reported at cost, less accumulated depreciation and impairment, net of origination fees or costs and lease incentives. Estimated income from operating lease assets, which includes lease origination fees, net of lease origination costs, is recorded as operating lease revenue on a straight-line basis over the term of the lease agreement. Leased vehicles are depreciated on a straight-line basis to an estimated residual value over the term of the lease agreements.
	We have significant investments in vehicles in operating lease portfolios, which are composed of vehicle leases to retail customers with lease terms of up to 60 months and vehicles leased to rental car companies with lease terms that average eight months or less. We are exposed to changes in the residual values of those assets. For impairment purposes the residual values represent estimates of the values of the vehicles leased at the end of the lease contracts and are determined based on forecasted auction proceeds when there is a reliable basis to make such a determination. Realization of the residual values is dependent on the future ability to market the vehicles under the prevailing market conditions. The adequacy of the estimate of the residual value is evaluated over the life of the lease and adjustments may be made to the extent the expected value of the vehicle at lease termination changes. Adjustments may be in the form of revisions to the depreciation rate or recognition of an impairment charge. Impairment is determined to exist if the expected future cash flows, which include estimated residual values, are lower than the carrying amount of the vehicles leased. If the carrying amount is considered impaired an impairment charge is recorded for the amount by which the carrying amount exceeds the fair value. Fair value is determined primarily using the anticipated cash flows, including estimated residual values.
	In our automotive operations when a leased vehicle is returned the asset is reclassified from Equipment on operating leases, net to Inventories at the lower of cost or estimated selling price, less cost to sell. Upon disposition proceeds are recorded in Automotive net sales and revenue and costs are recorded in Automotive cost of sales. In our automotive finance operations when a leased vehicle is returned or repossessed the asset is recorded in Other assets at the lower of cost or estimated selling price, less costs to sell. Upon disposition a gain or loss is recorded for any difference between the net book value of the leased asset and the proceeds from the disposition of the asset.
	Depreciation expense and impairment charges related to Equipment on operating leases, net are recorded in Automotive cost of sales or GM Financial operating and other expenses.
	Valuation of Cost and Equity Method Investments
	When events and circumstances warrant, investments accounted for under the cost or equity method of accounting are evaluated for impairment. An impairment charge is recorded whenever a decline in value of an investment below its carrying amount is determined to be other-than-temporary. Impairment charges related to equity method investments are recorded in Equity income. Impairment charges related to cost method investments are recorded in Interest income and other non-operating income, net.
	Property, net
	Property, plant and equipment, including internal use software, is recorded at cost. Major improvements that extend the useful life or add functionality of property are capitalized. The gross amount of assets under capital leases is included in property, plant and equipment. Expenditures for repairs and maintenance are charged to expense as incurred. We depreciate all depreciable property using the straight-line method. Leasehold improvements are amortized over the period of lease or the life of the asset, whichever is shorter. The amortization of the assets under capital leases is included in depreciation expense. Upon retirement or disposition of property, plant and equipment, the cost and related accumulated depreciation are removed from the accounts and any resulting gain or loss is recorded in earnings. Impairment charges related to property are recorded in Automotive cost of sales, Automotive selling, general and administrative expense or GM Financial operating and other expenses.
	Special Tools
	Special tools represent product-specific powertrain and non-powertrain related tools, dies, molds and other items used in the vehicle manufacturing process. Expenditures for special tools are recorded at cost and are capitalized. We amortize all non-powertrain special tools over their estimated useful lives using an accelerated amortization method. We amortize powertrain special tools over their estimated useful lives using the straight-line method. Impairment charges related to special tools are recorded in Automotive cost of sales.
	Goodwill
	Goodwill arises from the application of fresh-start reporting and acquisitions accounted for as business combinations. Goodwill is tested for impairment for all reporting units on an annual basis as of October 1, or more frequently if events occur or circumstances change that would warrant such a review. Our reporting units are GMNA and GME and various reporting units within the GMIO, GMSA and GM Financial segments. When performing our goodwill impairment testing, the fair values of our reporting units are determined based on valuation techniques using the best available information, primarily discounted cash flow projections. We make significant assumptions and estimates, which utilize Level 3 measures, about the extent and timing of future cash flows, growth rates, market share and discount rates that represent unobservable inputs into our valuation methodologies. Our fair value estimates for annual and event-driven impairment tests assume the achievement of the future financial results contemplated in our forecasted cash flows and there can be no assurance that we will realize that value. The valuation methodologies utilized to perform our goodwill impairment testing were consistent with those used in our application of fresh-start reporting on July 10, 2009 and in any subsequent annual or event-driven goodwill impairment tests and utilized Level 3 measures. Because the fair value of goodwill can be measured only as a residual amount and cannot be determined directly we calculate the implied goodwill for those reporting units failing Step 1 in the same manner that goodwill is recognized in a business combination pursuant to Accounting Standards Codification (ASC) 805.
	Intangible Assets, net
	Intangible assets, excluding goodwill, primarily include brand names, technology and intellectual property, customer relationships and dealer networks. Intangible assets are amortized on a straight-line or an accelerated method of amortization over their estimated useful lives. An accelerated amortization method reflecting the pattern in which the asset will be consumed is utilized if that pattern can be reliably determined. We consider the period of expected cash flows and underlying data used to measure the fair value of the intangible assets when selecting a useful life. Impairment charges related to intangible assets are recorded in Automotive selling, general and administrative expense or Automotive cost of sales. Amortization of developed technology and intellectual property is recorded in Automotive cost of sales. Amortization of brand names, customer relationships and our dealer networks is recorded in Automotive selling, general and administrative expense or GM Financial operating and other expenses.
	Valuation of Long-Lived Assets
	The carrying amount of long-lived assets and finite-lived intangible assets to be held and used in the business are evaluated for impairment when events and circumstances warrant. If the carrying amount of a long-lived asset group is considered impaired, a loss is recorded based on the amount by which the carrying amount exceeds fair value. Product-specific long-lived asset groups are tested for impairment at the platform or vehicle line level and consider their geographical location. Non-product specific long-lived assets are tested for impairment on a reporting unit basis in GMNA and GME and tested at or within our various reporting units within our GMIO, GMSA and GM Financial segments. Fair value is determined using either the market or sales comparison approach, cost approach or anticipated cash flows discounted at a rate commensurate with the risk involved. Long-lived assets to be disposed of other than by sale are considered held for use until disposition. Product-specific assets may become impaired as a result of declines in profitability due to changes in volume, pricing or costs.
Pension and OPEB Plans
Attribution, Methods and Assumptions
The cost of benefits provided by defined benefit pension plans is recorded in the period employees provide service. The cost of pension plan amendments that provide for benefits already earned by plan participants is amortized over the expected period of benefit which may be: (1) the duration of the applicable collective bargaining agreement specific to the plan; (2) expected future working lifetime; or (3) the life expectancy of the plan participants.
The cost of medical, dental, legal service and life insurance benefits provided through postretirement benefit plans is recorded in the period employees provide service. The cost of postretirement plan amendments that provide for benefits already earned by plan participants is amortized over the expected period of benefit which may be: (1) the average period to full eligibility; (2) the average life expectancy of the plan participants; or (3) the period to the plan's termination date for a plan which provides legal services.
An expected return on plan asset methodology is utilized to calculate future pension expense for certain significant funded benefit plans. A market-related value of plan assets methodology is also utilized that averages gains and losses on the plan assets over a period of years to determine future pension expense. The methodology recognizes 60% of the difference between the fair value of assets and the expected calculated value in the first year and 10% of that difference over each of the next four years.
The discount rate assumption is established for each of the retirement-related benefit plans at their respective measurement dates. In the U.S. we use a cash flow matching approach that uses projected cash flows matched to spot rates along a high quality corporate yield curve to determine the present value of cash flows to calculate a single equivalent discount rate.
The benefit obligation for pension plans in Canada, the United Kingdom and Germany represents 92% of the non-U.S. pension benefit obligation at December 31, 2014. The discount rates for plans in Canada, the United Kingdom and Germany are determined using a cash flow matching approach similar to the U.S. approach.
Plan Asset Valuation
Due to the lack of timely available market information for certain investments in the asset classes described below as well as the inherent uncertainty of valuation, reported fair values may differ from fair values that would have been used had timely available market information been available.
Cash Equivalents and Other Short-Term Investments
Money market funds and other similar short-term investment funds are valued using the net asset value per share (NAV). Prices for short-term debt securities are received from independent pricing services or from dealers who make markets in such securities. Independent pricing services utilize matrix pricing which considers readily available inputs such as the yield or price of bonds of comparable quality, coupon, maturity and type as well as dealer supplied prices. Money market mutual funds which provide investors with the ability to redeem their interests on a daily basis and for which NAVs are publicly available are classified in Level 1. Other cash equivalents and short-term investments are classified in Level 2.
Common and Preferred Stock
Common and preferred stock for which market prices are readily available at the measurement date are valued at the last reported sale price or official closing price on the primary market or exchange on which they are actively traded and are classified in Level 1. Such equity securities for which the market is not considered to be active are valued via the use of observable inputs, which may include, among others, the use of adjusted market prices last available, bids or last available sales prices and/or other observable inputs and are classified in Level 2. Common and preferred stock classified in Level 3 are those privately issued securities or other issues that are valued via the use of valuation models using significant unobservable inputs that generally consider among others, aged (stale) pricing, earnings multiples, discounted cash flows and/or other qualitative and quantitative factors.
Fixed Income Securities
Fixed income securities are valued based on quotations received from independent pricing services or from dealers who make markets in such securities. Debt securities which are priced via the use of pricing services that utilize matrix pricing which considers readily observable inputs such as the yield or price of bonds of comparable quality, coupon, maturity and type as well as dealer supplied prices, are classified in Level 2. Fixed income securities within this category that are typically priced by dealers and pricing services via the use of proprietary pricing models which incorporate significant unobservable inputs are classified in Level 3. These inputs primarily consist of yield and credit spread assumptions, discount rates, prepayment curves, default assumptions and recovery rates.
Investment Funds, Private Equity and Debt Investments and Real Estate Investments
Investments in exchange traded funds, real estate investment trusts and mutual funds, for which market quotations are generally readily available, are valued at the last reported sale price, official closing price or publicly available NAV (or its equivalent) on the primary market or exchange on which they are traded and are classified in Level 1. Investments in private investment funds (including hedge funds, private equity funds and real estate funds) are generally valued based on their respective NAV (or its equivalent), as a practical expedient to estimate fair value due to the absence of readily available market prices. Investments in private investment funds, which may be fully redeemed at NAV in the near-term are generally classified in Level 2. Investments in funds, which may not be fully redeemed at NAV in the near-term, are generally classified in Level 3.
Direct investments in private equity, private debt and real estate securities are generally valued in good faith via the use of the market approach (earnings multiples from comparable companies) or the income approach (discounted cash flow techniques), and consider inputs such as revenue growth and gross margin assumptions, discount rates, discounts for lack of liquidity, market capitalization rates and the selection of comparable companies. As these valuations incorporate significant unobservable inputs they are classified in Level 3.
Fair value estimates for private investment funds, private equity, private debt and real estate investments are provided by the respective investment sponsors or investment advisers and are subsequently reviewed and approved by management. In the event management concludes a reported NAV or fair value estimate (collectively, external valuation) does not reflect fair value or is not determined as of the financial reporting measurement date, we will consider whether and when deemed necessary to make an adjustment at the balance sheet date. In determining whether an adjustment to the external valuation is required, we will review material factors that could affect the valuation, such as changes to the composition or performance of the underlying investments or comparable investments, overall market conditions, expected sale prices for private investments which are probable of being sold in the short-term and other economic factors that may possibly have a favorable or unfavorable effect on the reported external valuation.
Derivatives
Exchange traded derivatives, such as options and futures, for which market quotations are readily available, are valued at the last reported sale price or official closing price on the primary market or exchange on which they are traded and are classified in Level 1. Over-the-counter derivatives, including but not limited to swaps, swaptions and forwards, which are typically valued through independent pricing services with observable inputs are generally classified in Level 2. Swaps that are cleared by clearinghouses or exchanges are valued with the prices provided by those venues and are generally classified in Level 2. Derivatives classified in Level 3 are typically valued via the use of pricing models which incorporate significant unobservable inputs. The inputs part of the model based valuations may include extrapolated or model-derived assumptions such as volatilities, yield and credit spread assumptions.
Job Security Programs and Extended Disability Benefits
We have job security programs to provide UAW and Unifor (combined union of the Canadian Auto Workers union and the Communications, Energy and Paperworkers Union of Canada) employees reduced wages and continued coverage under certain employee benefit programs depending on the employee's classification as well as the number of years of service that the employee has accrued. We also provide extended disability benefits for employees currently disabled and those in the active workforce who may become disabled in the form of income replacement, healthcare costs and life insurance premiums.
We recognize a liability for job security programs and extended disability benefits over the expected service period using measurement provisions similar to those used to measure our OPEB obligations based on our best estimate of the probable liability at the measurement date. We record actuarial gains and losses immediately in earnings.
Stock Incentive Plans
We measure and record compensation expense for all share-based payment awards based on the award's estimated fair value which is the fair value of our common stock on the date of grant for RSUs and Performance Share Units (PSUs). For awards that do not have an accounting grant date established, the compensation cost is based on the fair value of our common stock at the end of each reporting period. We record compensation cost for the awards on a straight-line basis over the entire vesting period, or for retirement eligible employees over the requisite service period. Salary stock awards granted are fully vested and nonforfeitable upon grant; therefore, compensation cost is recorded on the date of grant. The liability for stock incentive plan awards settled in cash is remeasured to fair value at the end of each reporting period.
Policy, Product Warranty and Recall Campaigns
The estimated costs related to policy and product warranties are accrued at the time products are sold and are charged to Automotive cost of sales. These estimates are established using historical information on the nature, frequency and average cost of claims of each vehicle line or each model year of the vehicle line and assumptions about future activity and events. Revisions are made when necessary based on changes in these factors. The estimated costs related to recall campaigns are accrued at the time of vehicle sale in GMNA and when probable and reasonably estimable in other geographical regions.
Income Taxes
The liability method is used in accounting for income taxes. Deferred tax assets and liabilities are recorded for temporary differences between the tax basis of assets and liabilities and their reported amounts in the consolidated financial statements using the statutory tax rates in effect for the year in which the differences are expected to reverse. The effect on deferred tax assets and liabilities of a change in tax rates is recorded in the results of operations in the period that includes the enactment date under the law.
Deferred income tax assets are evaluated quarterly to determine if valuation allowances are required or should be adjusted. We establish valuation allowances for deferred tax assets based on a more likely than not standard. The ability to realize deferred tax assets depends on the ability to generate sufficient taxable income within the carryback or carryforward periods provided for in the tax law for each applicable tax jurisdiction. The assessment regarding whether a valuation allowance is required or should be adjusted also considers all available positive and negative evidence factors. It is difficult to conclude a valuation allowance is not required when there is significant objective and verifiable negative evidence, such as cumulative losses in recent years. We utilize a rolling three years of actual and current year results as the primary measure of cumulative losses in recent years.
Income tax expense (benefit) for the year is allocated between continuing operations and other categories of income such as Other comprehensive income (loss). In periods in which there is a pre-tax loss from continuing operations and pre-tax income in another income category, the tax benefit allocated to continuing operations is determined by taking into account the pre-tax income of other categories.
We record uncertain tax positions on the basis of a two-step process whereby: (1) we determine whether it is more likely than not that the tax positions will be sustained based on the technical merits of the position; and (2) for those tax positions that meet the more likely than not recognition, we recognize the largest amount of tax benefit that is greater than 50% likely to be realized upon ultimate settlement with the related tax authority. We record interest and penalties on uncertain tax positions in Income tax expense (benefit).
Foreign Currency Transactions and Translation
The assets and liabilities of foreign subsidiaries that use the local currency as their functional currency are translated to U.S. Dollars based on the current exchange rate prevailing at each balance sheet date and any resulting translation adjustments are included in Accumulated other comprehensive loss. The assets and liabilities of foreign subsidiaries whose local currency is not their functional currency are remeasured from their local currency to their functional currency and then translated to U.S. Dollars. Revenues and expenses are translated into U.S. Dollars using the average exchange rates prevailing for each period presented.
Gains and losses arising from foreign currency transactions and the effects of remeasurements discussed in the preceding paragraph are recorded in Automotive cost of sales and GM Financial operating and other expenses unless related to Automotive debt, which are recorded in Interest income and other non-operating income, net. Foreign currency transaction and remeasurement losses were $437 million, $350 million and $117 million in the years ended December 31, 2014, 2013 and 2012.
Accounting Standards Not Yet Adopted
In May 2014 the Financial Accounting Standards Board issued Accounting Standards Update (ASU) 2014-09, “Revenue from Contracts with Customers” (ASU 2014-09) which requires companies to recognize revenue when a customer obtains control rather than when companies have transferred substantially all risks and rewards of a good or service. This update is effective for annual reporting periods beginning on or after December 15, 2016 and interim periods therein and requires expanded disclosures. We are currently assessing the impact the adoption of ASU 2014-09 will have on our consolidated financial statements.

Acquisition_of_Businesses

Acquisition of Businesses	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Acquisition of Businesses [Text Block]	Acquisition of Businesses
	Acquisition of Certain Ally Financial International Operations
	In November 2012 GM Financial entered into a definitive agreement with Ally Financial to acquire 100% of the outstanding equity interests in the top level holding companies of its automotive finance and financial services operations in Europe and Latin America and a separate agreement to acquire Ally Financial’s non-controlling equity interest in SAIC-GMAC, which conducts automotive finance and other financial services in China.
	In the year ended December 31, 2013 GM Financial completed acquisitions of Ally Financial's European and Latin American automotive finance operations for an aggregate consideration of $3.3 billion. GM Financial recorded the fair value of the assets acquired and liabilities assumed on the acquisition dates, which consisted primarily of finance receivables and secured and unsecured debt with the remaining amount allocated to cash, other assets and liabilities and the residual goodwill recorded of $144 million. In the year ended December 31, 2014 there were no significant adjustments recorded to these assets acquired or liabilities assumed. The results of the acquired European and Latin American automotive finance operations are included in GM Financial's results beginning on the dates GM Financial completed each acquisition. The unaudited pro forma revenue and net income attributable to stockholders for the year ended December 31, 2013 had these acquisitions occurred as of January 1, 2012 would be $156.3 billion and $5.5 billion.
	On January 2, 2015 GM Financial completed its acquisition of Ally Financial's 40% equity interest in SAIC-GMAC in China. The aggregate purchase price was approximately $1.0 billion, subject to certain post-closing adjustments. Also on January 2, 2015 GM Financial sold a 5% equity interest in SAIC-GMAC to SAICFC, a current shareholder of SAIC-GMAC, for proceeds of approximately $120 million, subject to certain post-closing adjustments. The valuation of the equity interest acquired was not yet complete at the time of this filing on Form 10-K because it was not practicable. As a result of these transactions GM indirectly owns 45% of SAIC-GMAC.

Marketable_Securities

Marketable Securities	12 Months Ended
	Dec. 31, 2014
Marketable Securities [Abstract]
Marketable Securities [Text Block]	Marketable Securities
	The following table summarizes information regarding marketable securities (dollars in millions):
		Fair Value Level		December 31, 2014						December 31, 2013
				Cost				Fair Value		Cost		Fair Value
	Cash and cash equivalents
	Available-for-sale securities
	U.S. government and agencies	2		$	1,600			$	1,600	$	1,437	$	1,437
	Sovereign debt	2		774				774		515		515
	Money market funds	1		2,480				2,480		1,262		1,262
	Corporate debt	2		6,036				6,036		7,598		7,598
	Total available-for-sale securities			$	10,890			10,890		$	10,812	10,812
	Trading securities
	Sovereign debt	2						431				—
	Corporate debt	2						—				25
	Total trading securities							431				25
	Total marketable securities classified as cash equivalents							11,321				10,837
	Cash, cash equivalents and time deposits							7,633				9,184
	Total cash and cash equivalents							$	18,954			$	20,021
	Marketable securities
	Available-for-sale securities
	U.S. government and agencies	2		$	5,957			$	5,957	$	5,343	$	5,344
	Corporate debt	2		2,000				1,998		1,889		1,891
	Total available-for-sale securities			$	7,957			7,955		$	7,232	7,235
	Trading securities – sovereign debt	2						1,267				1,737
	Total marketable securities							$	9,222			$	8,972
	Restricted cash and marketable securities
	Available-for-sale securities
	Money market funds	1		$	1,381			$	1,381	$	897	$	897
	Other	2		45				46		34		35
	Total marketable securities classified as restricted cash and marketable securities			$	1,426			1,427		$	931	932
	Restricted cash and cash equivalents and time deposits							846				1,144
	Total restricted cash and marketable securities							$	2,273			$	2,076
	We are required to post cash and marketable securities as collateral as part of certain agreements that we enter into as part of our operations. Cash and marketable securities subject to contractual restrictions and not readily available are classified as Restricted cash and marketable securities. Restricted cash and marketable securities are invested in accordance with the terms of the underlying agreements and include amounts related to various deposits, escrows and other cash collateral.
	Sales proceeds from investments classified as available-for-sale and sold prior to maturity were $5.9 billion, $4.7 billion and $4.7 billion in the years ended December 31, 2014, 2013 and 2012. Cumulative unrealized gains and losses on available-for-sale securities and net unrealized gains and losses on trading securities were insignificant at and in the years ended December 31, 2014, 2013 and 2012.
	The following table summarizes the amortized cost and the fair value of investments classified as available-for-sale by contractual maturity at December 31, 2014 (dollars in millions):
		Amortized Cost				Fair Value
	Due in one year or less	$	14,461			$	14,461
	Due after one year through five years	1,951				1,950
	Total contractual maturities of available-for-sale securities	$	16,412			$	16,411
	Peugeot S.A.
	In December 2013 we sold our seven percent investment in Peugeot S. A. (PSA) common stock for $339 million, net of disposal costs and we recorded a net gain of $152 million in Interest income and other non-operating income, net.
	At December 31, 2012 we determined that the carrying amount of our investment in PSA common stock was impaired and that the impairment was other-than-temporary. As a result we transferred the total unrealized losses from Accumulated other comprehensive loss to Interest income and other non-operating income, net resulting in an impairment charge of $220 million.

GM_Financial_Receivables_net

GM Financial Receivables, net (GM Financial [Member])	12 Months Ended
	Dec. 31, 2014
GM Financial [Member]
Finance Receivables [Line Items]
GM Financial Receivables, net [Text Block]	GM Financial Receivables, net
	The following table summarizes the components of consumer and commercial finance receivables, net (dollars in millions):
		December 31, 2014											December 31, 2013
		Consumer			Commercial				Total				Consumer			Commercial			Total
	Pre-acquisition finance receivables, outstanding amount	$	508		$	—			$	508			$	1,294		$	—		$	1,294
	Pre-acquisition finance receivables, carrying amount	$	459		$	—			$	459			$	1,174		$	—		$	1,174
	Post-acquisition finance receivables, net of fees	25,164			7,606				32,770				21,956			6,050			28,006
	Finance receivables	25,623			7,606				33,229				23,130			6,050			29,180
	Less: allowance for loan losses	(655		)	(40		)		(695		)		(497		)	(51		)	(548		)
	GM Financial receivables, net	$	24,968		$	7,566			$	32,534			$	22,633		$	5,999		$	28,632
	Fair value of GM Financial receivables, net								$	33,106									$	28,668
	Allowance for loan losses classified as current at December 31, 2014 and 2013 were $529 million and $427 million.
	GM Financial determines the fair value of consumer finance receivables using observable and unobservable inputs within a cash flow model. The inputs reflect assumptions regarding expected prepayments, deferrals, delinquencies, recoveries and charge-offs of the loans within the portfolio. The cash flow model produces an estimated amortization schedule of the finance receivables which is the basis for the calculation of the series of cash flows that derive the fair value of the portfolio. The series of cash flows are calculated and discounted using a weighted-average cost of capital (WACC) or current interest rates. The WACC uses unobservable debt and equity percentages, an unobservable cost of equity and an observable cost of debt based on companies with a similar credit rating and maturity profile as the portfolio. Macroeconomic factors could affect the credit performance of the portfolio and therefore could potentially affect the assumptions used in GM Financial's cash flow model. A substantial majority of commercial finance receivables have variable interest rates and maturities of one year or less. Therefore, the carrying amount is considered to be a reasonable estimate of fair value.
	The following table summarizes activity for the allowance for loan losses on consumer and commercial finance receivables (dollars in millions):
		Years Ended December 31,
		2014			2013				2012
	Balance at beginning of period	$	548		$	351			$	179
	Provision for loan losses	604			475				304
	Charge-offs	(914		)	(643		)		(304		)
	Recoveries	470			362				172
	Effect of foreign currency	(13		)	3				—
	Balance at end of period	$	695		$	548			$	351
	The balances and activity of the allowance for commercial loan losses were insignificant at and for the years ended December 31, 2014, 2013 and 2012.
	Credit Quality
	Consumer Finance Receivables
	GM Financial uses proprietary scoring systems that measure the credit quality of the receivables using several factors, such as credit bureau information, consumer credit risk scores (e.g. FICO scores) and contract characteristics. In addition to GM Financial's proprietary scoring systems GM Financial considers other individual consumer factors such as employment history, financial stability and capacity to pay. Subsequent to origination GM Financial reviews the credit quality of retail receivables based on customer payment activity. At the time of loan origination substantially all of GM Financial's international consumers have prime credit scores. At the time of loan origination many consumers in North America had sub-prime credit scores, which are defined as FICO scores of less than 620. At December 31, 2014 and 2013, 83% and 88% of the consumer finance receivables in North America were from consumers with FICO scores of less than 620.
	GM Financial purchases consumer finance contracts from automobile dealers without recourse, and accordingly, the dealer has no liability to GM Financial if the consumer defaults on the contract. Finance receivables are collateralized by vehicle titles and GM Financial has the right to repossess the vehicle in the event the consumer defaults on the payment terms of the contract.
	An account is considered delinquent if a substantial portion of a scheduled payment has not been received by the date such payment was contractually due. At December 31, 2014 and 2013 the accrual of finance charge income has been suspended on delinquent consumer finance receivables with contractual amounts due of $682 million and $642 million. The following table summarizes the contractual amount of delinquent contracts, which is not significantly different than the recorded investment of the consumer finance receivables (dollars in millions):
		December 31, 2014						December 31, 2013
		Amount			Percent of Contractual Amount Due			Amount				Percent of Contractual Amount Due
	31-to-60 days delinquent	$	1,083		4.2	%		$	952			4.1	%
	Greater-than-60 days delinquent	432			1.7	%		408				1.7	%
	Total finance receivables more than 30 days delinquent	1,515			5.9	%		1,360				5.8	%
	In repossession	40			0.2	%		41				0.2	%
	Total finance receivables more than 30 days delinquent or in repossession	$	1,555		6.1	%		$	1,401			6	%
	Impaired Finance Receivables - TDRs
	The following table summarizes the outstanding recorded investment for consumer finance receivables that are considered to be TDRs and the related allowance (dollars in millions):
		December 31, 2014			December 31, 2013
	Outstanding recorded investment	$	1,234		$	767
	Less: allowance for loan losses	(172		)	(103		)
	Outstanding recorded investment, net of allowance	$	1,062		$	664
	Unpaid principal balance	$	1,255		$	779
	Commercial Finance Receivables
	GM Financial's commercial finance receivables consist of dealer financings, primarily for inventory purchases. A proprietary model is used to assign a risk rating to each dealer. A credit review of each dealer is performed at least annually and, if necessary, the dealer's risk rating is adjusted on the basis of the review. At December 31, 2014 and 2013 the commercial finance receivables on non-accrual status were insignificant. The following table summarizes the credit risk profile by dealer grouping of the commercial finance receivables (dollars in millions):
		December 31, 2014			December 31, 2013
	Group I - Dealers with superior financial metrics	$	1,050		$	549
	Group II - Dealers with strong financial metrics	2,022			1,460
	Group III - Dealers with fair financial metrics	2,599			1,982
	Group IV - Dealers with weak financial metrics	1,173			1,462
	Group V - Dealers warranting special mention due to potential weaknesses	524			385
	Group VI - Dealers with loans classified as substandard, doubtful or impaired	238			212
		$	7,606		$	6,050
	The credit lines for Group VI dealers are typically suspended and no further funding is extended to these dealers.

Inventories

Inventories	12 Months Ended
	Dec. 31, 2014
Inventory Disclosure [Abstract]
Inventories [Text Block]	Inventories
	The following table summarizes the components of Inventories (dollars in millions):
		December 31, 2014		December 31, 2013
	Productive material, supplies and work in process	$	5,380	$	5,872
	Finished product, including service parts	8,262		8,167
	Total inventories	$	13,642	$	14,039

Equipment_on_Operating_Leases_

Equipment on Operating Leases, net (Vehicles [Member])	12 Months Ended
	Dec. 31, 2014
Vehicles [Member]
Property Subject to or Available for Operating Lease [Line Items]
Equipment on Operating Leases, net [Text Block]	Equipment on Operating Leases, net
	Automotive
	Equipment on operating leases, net is composed of vehicle sales to daily rental car companies with a guaranteed repurchase obligation. The following tables summarize information related to Equipment on operating leases, net (dollars in millions):
		December 31, 2014			December 31, 2013
	Equipment on operating leases	$	3,822		$	2,605
	Less: accumulated depreciation	(258		)	(207		)
	Equipment on operating leases, net	$	3,564		$	2,398
		Years Ended December 31,
		2014			2013			2012
	Depreciation expense	$	507		$	218		$	227
	Impairment charges	$	155		$	168		$	181
	Automotive Financing - GM Financial
	GM Financial originates leases in the U.S. and Canada that are recorded as operating leases. A Canadian subsidiary of GM Financial originates and sells leases to a third-party with servicing retained. The following table summarizes GM Financial equipment on operating leases, net (dollars in millions):
		December 31, 2014			December 31, 2013
	GM Financial equipment on operating leases	$	8,268		$	4,025
	Less: accumulated depreciation	(1,208		)	(642		)
	GM Financial equipment on operating leases, net	$	7,060		$	3,383
	Depreciation expense related to GM Financial equipment on operating leases, net was $868 million, $450 million and $205 million in the years ended December 31, 2014, 2013 and 2012.
	The following table summarizes minimum rental payments due to GM Financial as lessor under operating leases (dollars in millions):
		2015			2016			2017		2018		2019
	Minimum rental receipts under operating leases	$	1,241		$	1,019		$	597	$	98	$	5

Equity_In_Net_Assets_Of_Noncon

Equity In Net Assets Of Nonconsolidated Affiliates	12 Months Ended
	Dec. 31, 2014
Equity Method Investments and Joint Ventures [Abstract]
Equity in Net Assets of Nonconsolidated Affiliates [Text Block]	Equity in Net Assets of Nonconsolidated Affiliates
	Nonconsolidated affiliates are entities in which an equity ownership interest is maintained and for which the equity method of accounting is used due to the ability to exert significant influence over decisions relating to their operating and financial affairs.
	Sales and income of our China JVs are not consolidated into our financial statements; rather, our proportionate share of the earnings of each joint venture is reflected as Equity income. The following table summarizes information regarding Equity income (dollars in millions):
		Years Ended December 31,
		2014			2013		2012
	China JVs	$	2,066		$	1,763	$	1,521
	Others	28			47		41
	Total equity income	$	2,094		$	1,810	$	1,562
	We received dividends from nonconsolidated affiliates of $1.8 billion, $1.7 billion and $1.4 billion in the years ended December 31, 2014, 2013 and 2012. At December 31, 2014 and 2013 we had undistributed earnings including dividends declared but not received of $2.0 billion and $1.8 billion related to our nonconsolidated affiliates.
	Investment in China JVs
	The following table summarizes our direct ownership interests in China JVs:
		December 31, 2014		December 31, 2013
	Shanghai General Motors Co., Ltd. (SGM)	50	%	50	%
	Shanghai GM Norsom Motor Co., Ltd. (SGM Norsom)	25	%	25	%
	Shanghai GM Dong Yue Motors Co., Ltd. (SGM DY)	25	%	25	%
	Shanghai GM Dong Yue Powertrain (SGM DYPT)	25	%	25	%
	SAIC-GM-Wuling Automobile Co., Ltd.	44	%	44	%
	FAW-GM Light Duty Commercial Vehicle Co., Ltd.	50	%	50	%
	Pan Asia Technical Automotive Center Co., Ltd.	50	%	50	%
	Shanghai OnStar Telematics Co., Ltd. (Shanghai OnStar)	40	%	40	%
	Shanghai Chengxin Used Car Operation and Management Co., Ltd. (Shanghai Chengxin Used Car)	33	%	33	%
	SAIC General Motors Sales Co., Ltd. (SGMS)	49	%	49	%
	SGM is a joint venture established by Shanghai Automotive Industry Corporation (SAIC) (50%) and us (50%). SGM has interests in three other joint ventures in China: SGM Norsom, SGM DY and SGM DYPT. These three joint ventures are jointly held by SGM (50%), SAIC (25%) and us (25%). These four joint ventures are engaged in the production, import and sale of a comprehensive range of products under the Buick, Chevrolet and Cadillac brands. SGM also has interests in Shanghai OnStar (20%) and Shanghai Chengxin Used Car (33%). SGM also has a 20% equity interest in SAIC-GMAC, a joint venture established by General Motors Acceptance Corporation (now Ally Financial) (40%) and SAICFC (40%). As a result of GM Financial's transactions on January 2, 2015 GM Financial now owns 35% of SAIC-GMAC and SAICFC owns 45%.
	SGMS is a joint venture established in November 2011 by SAIC (51%) and us (49%) to engage in the sales of the imported Buick, Chevrolet and Cadillac brands and the sales of automobiles manufactured by SGM.
	Investment in and Summarized Financial Data of Nonconsolidated Affiliates
	The following table summarizes the carrying amount of investments in nonconsolidated affiliates (dollars in millions):
		December 31, 2014			December 31, 2013
	China JVs	$	8,140		$	7,851
	Other investments	210			243
	Total equity in net assets of nonconsolidated affiliates	$	8,350		$	8,094
	At December 31, 2014 and 2013 the carrying amount of our investments in certain joint ventures exceeded our share of the underlying net assets by $3.9 billion and $3.8 billion primarily related to goodwill from the application of fresh-start reporting and purchase of additional interests in nonconsolidated affiliates.
	The following tables present summarized financial data for nonconsolidated affiliates (dollars in millions):
		31-Dec-14								31-Dec-13
		China JVs			Others		Total			China JVs		Others		Total
	Summarized Balance Sheet Data
	Current assets	$	15,442		$	2,636	$	18,078		$	14,666	$	2,234	$	16,900
	Non-current assets	9,758			1,507		11,265			8,187		1,458		9,645
	Total assets	$	25,200		$	4,143	$	29,343		$	22,853	$	3,692	$	26,545
	Current liabilities	$	16,141		$	2,179	$	18,320		$	14,019	$	1,859	$	15,878
	Non-current liabilities	931			495		1,426			1,065		511		1,576
	Total liabilities	$	17,072		$	2,674	$	19,746		$	15,084	$	2,370	$	17,454
	Non-controlling interests	$	1,043		$	3	$	1,046		$	1,040	$	—	$	1,040
		Years Ended December 31,
		2014			2013		2012
	Summarized Operating Data
	China JVs' net sales	$	43,853		$	38,767	$	33,364
	Others' net sales	3,171			1,830		3,963
	Total net sales	$	47,024		$	40,597	$	37,327
	China JVs' net income	$	4,312		$	3,685	$	3,198
	Others' net income (loss)	91			50		(23		)
	Total net income	$	4,403		$	3,735	$	3,175
	Transactions with Nonconsolidated Affiliates
	Nonconsolidated affiliates are involved in various aspects of the development, production and marketing of cars, trucks and automobile parts. We purchase component parts and vehicles from certain nonconsolidated affiliates for resale to dealers. We also sell component parts and vehicles to certain nonconsolidated affiliates. The following tables summarize transactions with nonconsolidated affiliates (dollars in millions):
		Years Ended December 31,
		2014			2013		2012
	Automotive sales and revenue	$	2,762		$	2,724	$	2,572
	Automotive purchases, net	$	311		$	724	$	497
	Interest income and other non-operating income, net	$	23		$	19	$	184
	Operating cash flows	$	4,321		$	3,607	$	3,385
		December 31, 2014			December 31, 2013
	Accounts and notes receivable, net	$	706		$	756
	Accounts payable	$	205		$	183

Property_net

Property, net	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment, Net [Abstract]
Property, net [Text Block]	Property, net
	The following table summarizes the components of Property, net (dollars in millions):
		Estimated Useful Lives in Years		December 31, 2014				December 31, 2013
	Land			$	1,695			$	1,868
	Buildings and improvements	May-40		5,236				4,971
	Machinery and equipment	27-Mar		16,788				15,222
	Construction in progress			4,114				2,644
	Real estate, plants and equipment			27,833				24,705
	Less: accumulated depreciation			(8,067		)		(6,787		)
	Real estate, plants and equipment, net			19,766				17,918
	Special tools, net	15-Jan		7,977				7,949
	Total property, net			$	27,743			$	25,867
	The amount of capitalized software included in Property, net was $817 million and $630 million in the years ended December 31, 2014 and 2013. The amount of interest capitalized and excluded from Automotive interest expense related to Property, net was $70 million, $81 million and $117 million in the years ended December 31, 2014, 2013 and 2012.
	The following table summarizes depreciation, amortization and impairment charges related to Property, net (dollars in millions):
		Years Ended December 31,
		2014				2013				2012
	Depreciation and amortization expense	$	4,187			$	3,959			$	3,888
	Impairment charges(a)	709				901				3,793
	Depreciation, amortization and impairment charges	$	4,896			$	4,860			$	7,681
	Capitalized software amortization expense(b)	$	295			$	244			$	209
	__________
	(a)	Includes impairment charges of $321 million and $179 million at GMIO and GME whose assets were written down to fair values of $85 million and $11 million at December 31, 2014. Also includes other assets whose fair value was determined to be $0 in the years ended December 31, 2014, 2013 and 2012 measured utilizing Level 3 inputs. Fair value measurements of the non-GMIO and non-GME asset group long-lived assets utilized projected cash flows discounted at a rate commensurate with the perceived business risks related to the assets involved.
	(b)	Included in total depreciation, impairment charges and amortization expense.
	Impairment Charges
	Year Ended December 31, 2013
	GMIO
	As a result of our strategic assessment of GM India in response to lower than expected sales performance of our current product offerings in India, higher raw material costs, unfavorable foreign exchange rates and recent deterioration in local market conditions we recorded impairment charges of $280 million to adjust the carrying amount of GM India’s real and personal property to fair value of $45 million. These charges were recorded in Automotive cost of sales. We also recorded intangible asset and goodwill impairment charges of $103 million, for total impairment charges of $383 million. The noncontrolling interest portion of these charges was $35 million based on our 90.8% ownership of GM India. Refer to Note 11 for additional information regarding the impairment of Intangible assets, net and Note 10 for additional information regarding the impairment of Goodwill.
	As a result of our plans to cease manufacturing and significantly reduce engineering at our GM Holden Ltd. (Holden) subsidiary in Australia by the end of 2017 we recorded asset impairment charges of $477 million to adjust the carrying amounts of certain long-lived assets to fair value of $71 million. These charges were recorded in Automotive cost of sales. Refer to Note 19 for additional information on the actions taken at Holden.
	Year Ended December 31, 2012
	During the fourth quarter of 2012 our European industry outlook deteriorated and our forecast of 2013 cash flows declined notwithstanding our actions. As a result of our recoverability test of the GME asset group we recorded asset impairment charges of $3.7 billion to adjust the carrying amount of the GME real and personal property to fair value of $0.4 billion. These charges were recorded primarily in Automotive cost of sales. We also recorded intangible asset and other long-lived asset impairment charges of $1.8 billion, for total impairment charges of $5.5 billion. Refer to Note 11 for additional information regarding the impairment of Intangible assets, net.
	Fair Value Measurements
	To determine the estimated fair value of real and personal property, the cost approach, market approach and income approach were considered. Under the cost approach, the determination of fair value considered the estimates of the cost to construct or purchase a new asset of equal utility at current prices with adjustments in value for physical deterioration, functional obsolescence, and economic obsolescence. Under the market approach, the determination of fair value considered the market prices in transactions for similar assets and certain direct market values based on quoted prices from brokers and secondary market participants for similar assets. Under the income approach, the determination of fair value considered the estimate of the present worth of future benefits derived from ownership, usually measured through the capitalization of a specific level of income which can be derived from the subject asset with adjustments in value for demolition costs and for the effect of an estimated holding period. Under the income approach, it was assumed fair value could not exceed the present value of the net cash flows discounted at a rate commensurate with the level of risk inherent in the subject asset. An in-exchange premise was determined to be the highest and best use.
	The following table summarizes the significant Level 3 inputs for real and personal property measurements:
		Valuation Technique(s)		Unobservable Input(s)		Range
	GM India personal property	Market approach		Economic obsolescence(a)		72% - 100%
	Holden real property	Income approach		Holding period(b)		0 - 3 years
				Discount rate(c)		11% - 12%
	GME real property	Market approach		Demolition costs(d)		6% - 23%
		Cost approach		Holding period(b)		0 - 4 years
		Income approach		Discount rate(c)		11.2% - 14.5%
	GME personal property	Market approach		Physical deterioration(e)		52% - 69%
		Cost approach		Functional obsolescence(f)		8% - 28%
				Economic obsolescence(a)		17% - 23%
	__________
	(a)	Represents estimated loss in asset value caused by factors external to the asset such as legislative enactments, changes in use, social change and change in supply and demand.
	(b)	Represents estimated marketing period for each property which dictates the amount of property specific holding costs to be incurred such as real estate taxes.
	(c)	Represents the discount rate for the specific property based on local market sources and available benchmarking data.
	(d)	Represents estimated gross cost to demolish and clear the structures on the property as a percentage of replacement cost new.
	(e)	Represents estimated loss in asset value due to wear and tear, action of the elements and other physical factors that reduce the life and serviceability of the asset.
	(f)	Represents estimated loss in asset value caused by inefficiencies and inadequacies of the asset itself.
	The personal property in our Holden asset group was determined to have a nominal fair value because of anticipated losses during the wind-down period and limited to no salvage value given the decline in the automotive manufacturing base in Australia.
	The fair value estimates for GM India, Holden and GME real and personal property are based on a valuation premise that assumes the assets' highest and best use are different than their current use based on the forecasted financial results of the asset groups.

Goodwill

Goodwill	12 Months Ended
	Dec. 31, 2014
Goodwill [Abstract]
Goodwill [Text Block]	Goodwill
	The following table summarizes the changes in the carrying amounts of Goodwill (dollars in millions):
		Automotive			GM Financial		Total
	Balance at January 1, 2013	$	695		$	1,278	$	1,973
	Impairment charges	(541		)	—		(541		)
	Goodwill from business combinations(a)	10			144		154
	Effect of foreign currency and other	(26		)	—		(26		)
	Balance at December 31, 2013	138			1,422		1,560
	Impairment charges	(120		)	—		(120		)
	Effect of foreign currency and other	(18		)	5		(13		)
	Balance at December 31, 2014	$	—		$	1,427	$	1,427
	Accumulated impairment charges at January 1, 2013	$	(29,897	)	$	—	$	(29,897	)
	Accumulated impairment charges at December 31, 2013	$	(30,438	)	$	—	$	(30,438	)
	Accumulated impairment charges at December 31, 2014	$	(30,558	)	$	—	$	(30,558	)
	_________
	(a)	Refer to Note 3 for additional information concerning the acquisitions.
	The total automotive Goodwill balance at December 31, 2013 was recorded in GMSA. In addition to our annual goodwill impairment tests we performed event-driven goodwill impairment tests at various dates for certain of our reporting units in the years ended December 31, 2013 and 2012.
	GMSA
	Based on the results of our annual goodwill impairment tests we recorded total Goodwill impairment charges of $120 million in the year ended December 31, 2014. The impairment charges primarily resulted from lower forecasted profitability in Brazil resulting from recent deterioration in local market conditions and in Venezuela resulting from challenging local market conditions, including unfavorable foreign exchange rates and the recent downward trend in the price of oil. At December 31, 2014 the goodwill balance was $0 for all of the reporting units in GMSA.
	GMNA
	Subsequent to our 2012 annual goodwill impairment test, we reversed $36.2 billion of our deferred tax asset valuation allowances for our GMNA reporting unit. The reversal of the deferred tax asset valuation allowances resulted in the carrying amount of our GMNA reporting unit exceeding fair value. As a result we performed an event-driven goodwill impairment test in the three months ended December 31, 2012 and recorded a Goodwill impairment charge of $26.4 billion. Refer to Note 18 for additional information on the reversal of our deferred tax asset valuation allowances for our U.S. and Canadian operations.
	GME
	At the time of our 2012 annual impairment test our GME reporting unit had a negative carrying amount and because it was more likely than not further goodwill impairment existed due to further deterioration in the business outlook for GME and increases in the fair value of estimated employee benefit obligations, we recorded Goodwill impairment charges of $590 million in the year ended December 31, 2012.
	GMIO
	Based on the results of our annual and event-driven goodwill impairment tests we recorded total Goodwill impairment charges of $541 million and $156 million in the years ended December 31, 2013 and 2012. The impairment charges primarily related to our GM Korea Company (GM Korea) and Holden reporting units. We performed event-driven goodwill impairment tests for GM Korea in 2013 and 2012 as the fair value of GM Korea continued to be below its carrying amount due to ongoing economic weakness in certain markets to which GM Korea exports coupled with lower forecasted margins resulting from higher raw material costs and unfavorable foreign exchange rates. Furthermore in the three months ended December 31, 2013 we announced our plans to cease mainstream distribution of Chevrolet brand in Western and Central Europe that resulted in the impairment of the remaining goodwill. Chevrolet sales in Europe are included in our GM Korea operations. We also recorded a Goodwill impairment charge in the three months ended December 31, 2013 associated with our GM India reporting unit resulting from lower forecasted profitability in India due to lower than expected sales performance of our current product offerings in India, higher raw material costs, unfavorable foreign exchange rates and deterioration in local market conditions. Refer to Note 9 for additional information on our operations in India. At December 31, 2013 the goodwill balance was $0 for all of the reporting units in GMIO.

Intangible_Assets_net

Intangible Assets, net	12 Months Ended
	Dec. 31, 2014
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Intangible Assets, net [Text Block]	Intangible Assets, net
	The following table summarizes the components of Intangible assets, net (dollars in millions):
		December 31, 2014							December 31, 2013
		Gross Carrying Amount			Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
	Technology and intellectual property	$	8,193		$	7,744	$	449	$	8,210	$	7,308	$	902
	Brands	4,447			683		3,764		4,466		559		3,907
	Dealer network and customer relationships	1,094			434		660		1,108		364		744
	Favorable contracts and other	345			331		14		345		326		19
	Total amortizing intangible assets	14,079			9,192		4,887		14,129		8,557		5,572
	Nonamortizing in process research and development	96					96		96				96
	Total intangible assets	$	14,175		$	9,192	$	4,983	$	14,225	$	8,557	$	5,668
	In December 2012 we entered into a product development agreement with PSA to collaborate on the development of certain vehicle platforms, components and modules. As a result of this agreement, in the three months ended March 31, 2013 we acquired the rights to certain technology and intellectual property for total consideration of $642 million. Consideration of $201 million was paid in cash in May 2013 with the remaining consideration to be paid by May 2018. The acquired rights were recorded at the present value of the total payments to be made as technology and intellectual property of $594 million. In December 2013 we agreed with PSA to mutually cancel development of one of the vehicle programs and reduce the amount of remaining consideration to be paid, resulting in a net charge of $49 million recorded in Automotive cost of sales in GMNA. The net charge consisted of an impairment of the associated intellectual property of $211 million and a reduction of total consideration from $642 million to $480 million.
	The following table summarizes the amortization expense and impairment charges related to Intangible assets, net (dollars in millions):
		Years Ended December 31,
		2014			2013		2012
	Amortization expense	$	676		$	1,281	$	1,568
	Impairment charges	$	16		$	523	$	1,755
	The following table summarizes estimated amortization expense related to Intangible assets, net in each of the next five years (dollars in millions):
		2015			2016		2017		2018		2019
	Estimated amortization expense	$	332		$	311	$	306	$	302	$	205
	Impairment Charges
	Year Ended December 31, 2013
	GMIO
	As a result of our strategic assessment of GM India we recorded impairment charges of $48 million to adjust the carrying amounts of Intangible assets, net, primarily favorable contract intangibles, to fair value of $0 because of a lack of economic support associated with GM India's declining operations. These charges were recorded primarily in Automotive cost of sales. Refer to Note 9 for additional information regarding the triggering events of the impairment charges in GM India.
	We recorded impairment charges of $264 million to adjust the carrying amounts of Intangible assets, net, primarily dealer network intangibles related to the Chevrolet network in Europe, to fair value of $0 because we are winding down the dealer network in 2014 and we expect to incur losses during the wind-down period. These charges were recorded in Automotive cost of sales. Refer to Note 19 for additional information on the withdrawal of the Chevrolet brand from Europe.
	Year Ended December 31, 2012
	We adjusted the carrying amount of the GME intangible assets to fair value of $139 million and recorded asset impairment charges of $1.8 billion at December 31, 2012. These charges were recorded primarily in Automotive selling, general and administrative expense. The fair value estimates for GME's intangible assets are based on a valuation premise that assumes the assets' highest and best use are different than their current use due to the overall European macro-economic environment.
	To determine the estimated fair value of the brand intangible assets we used the relief from royalty method which is a form of the income approach. Under this approach revenue associated with the brand is projected over the expected remaining useful life of the asset. A royalty rate is then applied to estimate the royalty savings. The royalty rate used was based on an analysis of empirical, market-derived royalty rates for guideline intangible assets and a profit split analysis to determine a rate that is economically supported by GME's forecasted profitability. The net after-tax royalty savings are calculated for each year during the remaining economic life of the asset and discounted to present value.
	To determine the estimated fair value of the dealer network we used the cost approach with adjustments in value for the overcapacity of dealers and the sales environment in the region. We determined the fair value to be $0.
	The following table summarizes the significant Level 3 inputs for brand intangible assets measurements:
			Valuation Technique	Unobservable Input(s)		Percentage
	Brand intangible assets		Income approach	Long-term growth rate		0.50%
				Pre-tax royalty rate(a)		0.14%
				Discount rate(b)		21.25%
	__________
	(a)	Represents estimated savings realized from owning the asset or having the royalty-free right to use the asset.
	(b)	Represents WACC adjusted for perceived business risks related to these intangible assets.

Variable_Interest_Entities

Variable Interest Entities	12 Months Ended
	Dec. 31, 2014
Variable Interest Entities [Abstract]
Variable Interest Entities [Text Block]	Variable Interest Entities
	Automotive Financing - GM Financial Consolidated VIEs
	GM Financial uses special purpose entities (SPEs) that are considered VIEs to issue variable funding notes to third party bank-sponsored warehouse facilities or asset-backed securities to investors in securitization transactions. The debt issued by these VIEs is backed by the cash flows related to finance receivables and leasing related assets transferred by GM Financial to the VIEs (Securitized Assets). GM Financial holds variable interests in the VIEs that could potentially be significant to the VIEs. GM Financial determined that they are the primary beneficiary of the SPEs because: (1) the servicing responsibilities for the Securitized Assets give GM Financial the power to direct the activities that most significantly impact the performance of the VIEs; and (2) the variable interests in the VIEs give GM Financial the obligation to absorb losses and the right to receive residual returns that could potentially be significant. The assets and liabilities of the VIEs are included in GM Financial's consolidated balance sheets. The following table summarizes the assets and liabilities related to GM Financial's consolidated VIEs prior to intercompany eliminations (dollars in millions):
		December 31, 2014		December 31, 2013
	Restricted cash	$	1,721	$	1,523
	Securitized Assets	$	27,704	$	23,584
	Securitization notes payable and other credit facilities	$	22,794	$	19,448
	The assets of the VIEs and the restricted cash held by GM Financial serve as the sole source of repayment for the debt issued by these entities. Restricted cash represents collections from the underlying Securitized Assets and certain reserve accounts held as credit enhancement for securitizations held by GM Financial for the benefit of the noteholders. An additional form of credit enhancement is provided in the form of overcollateralization, whereby more loans or leases are transferred to the VIEs than the amount of asset-backed securities issued by the VIEs. GM Financial also maintains an allowance for estimated probable credit losses on securitized receivables. Cash pledged is invested in highly liquid securities with original maturities of 90 days or less.
	Investors in the notes issued by the VIEs do not have recourse to GM Financial or its other assets, with the exception of customary representation and warranty repurchase provisions and indemnities that GM Financial provides as the servicer. GM Financial is not required and does not currently intend to provide additional financial support to these SPEs. While these subsidiaries are included in GM Financial's consolidated financial statements, these subsidiaries are separate legal entities and their assets are legally owned by them and are not available to GM Financial's creditors.

Accrued_Liabilities_and_Other_

Accrued Liabilities and Other Liabilities	12 Months Ended
	Dec. 31, 2014
Accrued Liabilities and Other Liabilities [Abstract]
Accrued Liabilities and Other Liabilities[Text Block]	Accrued Liabilities and Other Liabilities
	The following table summarizes the components of Accrued liabilities and Other liabilities (dollars in millions):
		December 31, 2014			December 31, 2013
	Current
	Dealer and customer allowances, claims and discounts	$	8,035		$	7,919
	Deposits primarily from rental car companies	6,089			4,713
	Deferred revenue	1,622			1,276
	Product warranty and related liabilities	3,582			2,721
	Payrolls and employee benefits excluding postemployment benefits	2,144			2,285
	Other	6,712			5,719
	Total accrued liabilities	$	28,184		$	24,633
	Non-current
	Deferred revenue	$	1,556		$	1,249
	Product warranty and related liabilities	6,064			4,880
	Employee benefits excluding postemployment benefits	1,049			1,192
	Postemployment benefits including facility idling reserves	1,259			1,216
	Other	4,154			4,816
	Total other liabilities	$	14,082		$	13,353
	The following table summarizes activity for product warranty and related liabilities which include policy, product warranty, recall campaigns and courtesy transportation (dollars in millions):
		Years Ended December 31,
		2014			2013			2012
	Beginning balance	$	7,601		$	7,633		$	7,031
	Warranties issued and assumed in period - recall campaigns and courtesy transportation	2,910			640			775
	Warranties issued and assumed in period - policy and warranty	2,540			2,757			2,840
	Payments	(4,326		)	(3,240		)	(3,575		)
	Adjustments to pre-existing warranties	1,187			49			504
	Effect of foreign currency and other	(266		)	(238		)	58
	Ending balance	$	9,646		$	7,601		$	7,633
	In the year ended December 31, 2014 we recorded charges of approximately $2.9 billion in Automotive cost of sales relating to recall campaigns and courtesy transportation, of which over 86% was recorded in GMNA. The recorded charges primarily comprised: (1) approximately $680 million for 2.6 million vehicles to repair ignition switches that could result in a loss of electrical power under certain circumstances that may prevent front airbags from deploying in the event of a crash (accident victims who died or suffered physical injury associated with these vehicles (or their families) may be eligible to participate in a compensation program, as more fully described in Note 17); to fix ignition lock cylinders that could allow removal of the ignition key while the engine is running, leading to possible rollaway or crash; and to provide courtesy transportation to owners of affected vehicles; partially offset by adjustments of approximately $95 million for courtesy transportation as a result of greater part availability and fewer customers utilizing courtesy transportation than originally estimated and approximately $80 million for costs originally estimated separately for ignition switches and ignition lock cylinders that are now being shipped and repaired at the same time resulting in reduced costs; (2) approximately $340 million for 1.9 million vehicles to replace either the power steering motor, the steering column, the power steering motor control unit or a combination of the steering column and the power steering motor control unit as the electric power steering could fail under certain circumstances; (3) approximately $185 million for 1.3 million vehicles prone to non-deployment of the side impact restraints if vehicles are not serviced when the Service Air Bag warning light is illuminated; (4) approximately $90 million for 2.7 million vehicles to modify the brake lamp wiring harness that could have corrosion develop due to micro-vibration; (5) approximately $80 million for 1.5 million vehicles to replace front safety lap belt cables that could fatigue and separate over time; (6) approximately $150 million for 1.4 million vehicles to replace the shift cable that could wear out over time resulting in mismatches of the gear position indicated by the shift lever; (7) approximately $325 million for 12.1 million vehicles to rework or replace ignition keys because the ignition switch may move out of the “run” position which may impact power steering and power braking and, depending on the timing of the key movement relative to the activation of the sensing algorithm of a crash event, may result in airbags not deploying; and (8) approximately $520 million for 5.2 million vehicles for other matters.
	We have historically accrued estimated costs related to recall campaigns in GMNA when they are probable and reasonably estimable, which typically occurs once it is determined a specific recall campaign is needed and announced. During the three months ended June 30, 2014, following the significant increase in the number of vehicles subject to recall in GMNA, the results of our ongoing comprehensive safety review, additional engineering analysis, the creation of a new Global Product Integrity organization, the appointment of a new Global Vice President of Vehicle Safety responsible for the safety development of our vehicle systems and our overall commitment to customer satisfaction, we accumulated sufficient historical data in GMNA to support the use of an actuarial-based estimation technique for recall campaigns. As such, we now accrue at the time of vehicle sale in GMNA the costs for recall campaigns. Based on the expanded historical data, we recorded a catch-up adjustment of $874 million to adjust the estimate for recall costs for previously sold vehicles, which is included in Adjustments to pre-existing warranties in the three months ended June 30, 2014. The estimation technique for recall campaigns takes into account our historical experience, including incident rates of recall campaigns. In the six months ended December 31, 2014 we announced 23 recalls covering approximately 8.1 million vehicles related to safety, customer satisfaction and other matters. The costs for these recalls are comprehended in the catch-up adjustment and also resulted in additional adjustment of approximately $200 million.

ShortTerm_and_LongTerm_Debt

Short-Term and Long-Term Debt	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Short-Term and Long-Term Debt [Text Block]	Short-Term and Long-Term Debt
	Automotive
	The following table summarizes the components of our short-term and long-term debt (dollars in millions):
		December 31, 2014			December 31, 2013
	Secured debt	$	237		$	320
	Unsecured debt	8,205			5,852
	Capital leases	968			965
	Total automotive debt(a)	$	9,410		$	7,137
	Fair value of automotive debt	$	9,799		$	6,837
	Available under credit facility agreements	$	12,026		$	10,404
	Interest rate range on outstanding debt(b)	0.0-18.0%			0.0-19.0%
	Weighted-average interest rate on outstanding short-term debt(b)	6.4		%	9		%
	Weighted-average interest rate on outstanding long-term debt(b)	4.3		%	3.8		%
	__________
	(a)	Net of a $681 million and $765 million net discount at December 31, 2014 and 2013.
	(b)	Includes coupon rates on debt denominated in various foreign currencies and interest free loans.
	The fair value of debt includes $7.6 billion measured utilizing Level 1 inputs at December 31, 2014 and $2.2 billion and $6.8 billion measured utilizing Level 2 inputs at December 31, 2014 and 2013. The fair value of debt measured utilizing Level 1 inputs was based on quoted prices in active markets for identical instruments that a market participant can access at the measurement date. The fair value of debt measured utilizing Level 2 inputs was based on quoted market prices in inactive markets for identical instruments and if unavailable, a discounted cash flow model. This model utilizes observable inputs such as contractual repayment terms and benchmark yield curves, plus a spread based on our senior unsecured notes that is intended to represent our nonperformance risk. We obtain the benchmark yield curves and yields on unsecured notes from independent sources that are widely used in the financial industry.
	Revolving Credit Facilities
	We received an investment grade corporate rating from Moody's in September 2013 and from S&P in September 2014 which allowed the release of the collateral securing our $11.0 billion revolving credit facilities under their terms.
	In October 2014 we amended our two primary revolving credit facilities, increasing our aggregate borrowing capacity from $11.0 billion to $12.5 billion. These facilities consist of a three-year, $5.0 billion facility and a five-year, $7.5 billion facility. Both facilities are available to the Company as well as certain wholly-owned subsidiaries, including GM Financial. The three-year, $5.0 billion facility allows for borrowings in U.S. Dollars and other currencies and includes a GM Financial borrowing sub-limit of $2.0 billion, a letter of credit sub-facility of $1.6 billion and a Brazilian Real sub-facility of $305 million. The five-year, $7.5 billion facility allows for borrowings in U.S. Dollars and other currencies and includes a GM Financial borrowing sub-limit of $2.0 billion, a letter of credit sub-limit of $500 million and a Brazilian Real sub-facility of $195 million.
	The revolving credit facilities contain representations, warranties and covenants that are typical for these types of facilities. The facilities also require us to maintain at least $4.0 billion in global liquidity and at least $2.0 billion in U.S. liquidity and to guarantee any borrowings by our subsidiaries. If we fail to maintain an investment grade corporate rating from two or more of the following credit rating agencies: Fitch, Moody's and S&P, we will be required to provide guarantees from certain domestic subsidiaries under the terms of the facilities. Interest rates on obligations under the revolving credit facilities are based on prevailing annual interest rates for Eurodollar loans or an alternative base rate, plus an applicable margin.
	Senior Unsecured Notes
	In November 2014 we issued $2.5 billion in aggregate principal amount of senior unsecured notes comprising $500 million of 4.0% notes due in 2025, $750 million of 5.0% notes due in 2035 and $1.25 billion of 5.2% notes due in 2045. In September 2013 we issued $4.5 billion in aggregate principal amount of senior unsecured notes comprising $1.5 billion of 3.5% notes due in 2018, $1.5 billion of 4.875% notes due in 2023 and $1.5 billion of 6.25% notes due in 2043. These notes contain terms and covenants customary of these types of securities including limitations on the amount of certain secured debt we may issue.
	Extinguishment of Debt
	In the year ended December 31, 2014 we prepaid and retired debt obligations with a total carrying amount of $325 million and recorded a net gain on extinguishment of debt of $202 million which primarily represented unsecured debt in Brazil. In the year ended December 31, 2013 we prepaid and retired debt obligations with a total carrying amount of $1.8 billion and recorded a net loss on extinguishment of debt of $212 million which primarily represented the unamortized debt discount on GM Korea mandatorily redeemable preferred shares. In the year ended December 31, 2012 we prepaid and retired debt obligations with a total carrying amount of $514 million and recorded a net loss on extinguishment of debt of $250 million which primarily represented the unamortized debt discount on GM Korea mandatorily redeemable preferred shares.
	Automotive Financing - GM Financial
	The following table summarizes the carrying amount and fair value of debt (dollars in millions):
			December 31, 2014						December 31, 2013
			Carrying Amount			Fair Value			Carrying Amount		Fair Value
	Secured debt		$	25,214		$	25,228		$	22,073	$	22,170
	Unsecured debt		12,217			12,479			6,973		7,078
	Total GM Financial debt		$	37,431		$	37,707		$	29,046	$	29,248
	The fair value of debt includes $32.8 billion and $23.0 billion measured utilizing Level 2 inputs and $4.9 billion and $6.2 billion measured utilizing Level 3 inputs at December 31, 2014 and December 31, 2013. The fair value of debt measured utilizing Level 2 inputs was based on quoted market prices and if unavailable, quoted market prices of similar securities. For debt that has terms of one year or less or has been priced within the last six months, the carrying amount or par value is considered to be a reasonable estimate of fair value. The fair value of debt measured utilizing Level 3 inputs was based on the discounted future net cash flows expected to be settled using current risk-adjusted rates.
	Secured Debt
	Most of the secured debt was issued by VIEs and is repayable only from proceeds related to the underlying pledged finance receivables and leases. Refer to Note 12 for additional information relating to GM Financial's involvement with VIEs. Secured debt consists of revolving credit facilities and securitization notes payable. Weighted-average interest rates are both fixed and variable, ranging from 0.35% to 13.43% at December 31, 2014.
	The revolving credit facilities are expected to be repaid over periods ranging up to five years. At the end of the revolving period, if not renewed, the debt will amortize over a defined period. GM Financial is required to hold certain funds in restricted cash accounts to provide additional collateral for borrowings under certain secured credit facilities. In the year ended December 31, 2014 GM Financial entered into new or renewed credit facilities with a total additional borrowing capacity of $5.5 billion.
	Securitization notes payable at December 31, 2014 are due beginning in 2016 through 2022. In the year ended December 31, 2014 GM Financial issued securitization notes payable of $10.7 billion with a weighted-average interest rate of 1.4% maturing on various dates through 2022.
	Unsecured Debt
	Unsecured debt consists of senior notes, credit facilities and other unsecured debt. Senior notes outstanding at December 31, 2014 are due beginning in 2016 through 2023 and have interest rates that range from 1.875% to 6.75%. In May 2014 GM Financial issued CAD 400 million of 3.25% senior notes which are due in May 2017. In July 2014 GM Financial issued $1.5 billion in aggregate principal amount of senior notes comprising $700 million of 2.625% notes due in July 2017 and $800 million of 3.5% notes due in July 2019. In September 2014 GM Financial issued $2.0 billion in aggregate principal amount of senior notes comprising $750 million of 3.0% notes due in September 2017 and $1.25 billion of 4.375% notes due in September 2021. In October 2014 GM Financial issued Euro 500 million of 1.875% term notes which are due in October 2019. The notes are guaranteed by GM Financial's principal operating subsidiary.
	In January 2015 GM Financial issued $2.25 billion in aggregate principal amount of senior notes comprising $1.0 billion of 3.15% notes due in January 2020, $1.0 billion of 4.0% notes due in January 2025 and $250 million of floating rate notes due in January 2020. Interest rates on the floating rate notes are equal to three-month LIBOR plus an applicable margin. The notes are guaranteed by GM Financial's principal operating subsidiary.
	The terms of advances on revolving credit facilities and other unsecured debt have remaining maturities of up to five years. Interest rates on credit facilities and other unsecured debt ranged from 0.98% to 13.35% at December 31, 2014.
	Consolidated
	Interest Expense
	The following table summarizes interest expense (dollars in millions):
		Years Ended December 31,
		2014			2013			2012
	Automotive	$	403		$	334		$	489
	Automotive Financing - GM Financial	1,426			715			283
	Total interest expense	$	1,829		$	1,049		$	772
	Debt Maturities
	The following table summarizes contractual maturities including capital leases at December 31, 2014 (dollars in millions):
		Automotive			Automotive Financing(a)			Total
	2015	$	503		$	14,491		$	14,994
	2016	174			9,177			9,351
	2017	511			7,255			7,766
	2018	1,600			2,666			4,266
	2019	109			1,860			1,969
	Thereafter	7,194			2,000			9,194
		$	10,091		$	37,449		$	47,540
	________
	(a)	Secured debt, credit facilities and other unsecured debt are based on expected payoff date. Senior notes principal amounts are based on maturity.
	At December 31, 2014 future interest payments on automotive capital lease obligations were $488 million. GM Financial had no capital lease obligations at December 31, 2014.
	Compliance with Debt Covenants
	Several of our loan facilities, including our revolving credit facilities, require compliance with certain financial and operational covenants as well as regular reporting to lenders, including providing certain subsidiary financial statements. Some of GM Financial’s secured and unsecured debt agreements also contain various covenants, including maintaining minimum financial ratios, asset quality and portfolio performance ratios as well as limits on deferment levels. Failure to meet certain of these requirements may result in a covenant violation or an event of default depending on the terms of the agreement. An event of default may allow lenders to declare amounts outstanding under these agreements immediately due and payable, to enforce their interests against collateral pledged under these agreements or restrict our ability or GM Financial's ability to obtain additional borrowings. No technical defaults or covenant violations existed at December 31, 2014.

Pensions_And_Other_Postretirem

Pensions And Other Postretirement Benefits	12 Months Ended
	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Pensions and Other Postretirement Benefits [Text Block]	Pensions and Other Postretirement Benefits
	Employee Pension and Other Postretirement Benefit Plans
	Defined Benefit Pension Plans
	Defined benefit pension plans covering eligible U.S. hourly employees (hired prior to October 2007) and Canadian hourly employees generally provide benefits of negotiated, stated amounts for each year of service and supplemental benefits for employees who retire with 30 years of service before normal retirement age. The benefits provided by the defined benefit pension plans covering eligible U.S. (hired prior to January 1, 2001) and Canadian salaried employees and employees in certain other non-U.S. locations are generally based on years of service and compensation history. Accrual of defined pension benefits ceased on September 30, 2012 for U.S. salaried employees and on December 31, 2012 for Canadian salaried employees. There is also an unfunded nonqualified pension plan covering primarily U.S. executives for service prior to January 1, 2007 and it is based on an “excess plan” for service after that date.
	The funding policy for qualified defined benefit pension plans is to contribute annually not less than the minimum required by applicable law and regulations or to directly pay benefit payments where appropriate. At December 31, 2014 all legal funding requirements had been met. We expect to contribute $70 million to our U.S. non-qualified plans and $1.1 billion to our non-U.S. pension plans in 2015. The following table summarizes contributions made to the defined benefit pension plans (dollars in millions):
		Years Ended December 31,
		2014				2013				2012
	U.S. hourly and salaried	$	143			$	128			$	2,420
	Non-U.S.	770				886				855
	Total	$	913			$	1,014			$	3,275
	We continue to pursue various options to fund and derisk our pension plans, including continued changes to the pension asset portfolio mix to reduce funded status volatility.
	Other Postretirement Benefit Plans
	Certain hourly and salaried defined benefit plans provide postretirement medical, dental, legal service and life insurance to eligible U.S. and Canadian retirees and their eligible dependents. Certain other non-U.S. subsidiaries have postretirement benefit plans, although most non-U.S. employees are covered by government sponsored or administered programs.
	The following table summarizes contributions to the U.S. OPEB plans (dollars in millions):
		Years Ended December 31,
		2014				2013				2012
	Employer contributions	$	354			$	393			$	432
	Plan participants' contributions	22				29				4
	Total contributions	$	376			$	422			$	436
	Defined Contribution Plans
	We have defined contribution plans for eligible U.S. salaried and hourly employees that provide discretionary matching contributions. Contributions are also made to certain non-U.S. defined contribution plans. We made contributions to our defined contribution plans of $513 million, $502 million and $352 million in the years ended December 31, 2014, 2013 and 2012.
	Significant Plan Amendments, Benefit Modifications and Related Events
	U.S. Salaried Defined Benefit Life Insurance Plan
	In September 2013 we amended the U.S. salaried life insurance plan effective January 1, 2014 to eliminate benefits for retirees and eligible employees retiring on or after August 1, 2009. The remeasurement, settlement and curtailment resulted in a decrease in the OPEB liability of $319 million, a decrease in the net pre-tax actuarial loss component of Accumulated other comprehensive loss of $236 million and a pre-tax gain of $83 million.
	U.S. Salaried Defined Benefit Pension Plan
	In the year ended December 31, 2012 we amended the salaried pension plan to cease the accrual of additional benefits effective September 30, 2012 resulting in a curtailment of $309 million which decreased the pension liability. We divided the plan to create a new legally separate defined benefit plan primarily for active and terminated vested participants. Settlement payments of $30.6 billion were made consisting of lump-sum pension distributions of $3.6 billion to retired salaried plan participants, group annuity contracts purchased for a total annuity premium of $25.1 billion and two separate previously guaranteed obligations of $1.9 billion were settled. These agreements unconditionally and irrevocably guarantee the full payment of all annuity payments to the participants that were receiving payments from the plan and the insurance companies assumed all investment risk associated with the assets that were delivered as the annuity contract premiums.
	Through these transactions we have settled certain pension obligations in their entirety resulting in a pre-tax settlement loss of $2.6 billion ($2.2 billion after tax) in Automotive cost of sales. The pre-tax loss is composed of existing losses in Accumulated other comprehensive loss of $377 million and the premium paid to the insurance company of $2.1 billion. The tax benefit of $413 million is composed of the statutory tax benefit of $1.0 billion offset by tax expense of $596 million primarily associated with the removal of prior period income tax allocations between Accumulated other comprehensive loss and Income tax expense (benefit).
	In the year ended December 31, 2012 we provided short-term, interest-free, unsecured loans of $2.2 billion to provide the plan with incremental liquidity to pay ongoing benefits and administrative costs. Through December 31, 2013 contributions of $1.7 billion were made from the $2.2 billion loans and the remaining amounts were repaid.
	Active salaried plan participants began receiving additional contributions in the defined contribution plan in October 2012. Lump-sum pension distributions in 2013 of $430 million resulted in a pre-tax settlement gain of $128 million.
	Other Remeasurements
	In the three months ended December 31, 2014 the SOA issued new mortality and mortality improvement tables that raise life expectancies and thereby indicate the amount of estimated aggregate benefit payments to our U.S. pension plans' participants is increasing. We have incorporated the new SOA mortality and mortality improvement tables into our December 31, 2014 measurement of our U.S. pension plans' benefit obligations. The change in these assumptions had the effect of increasing the December 31, 2014 U.S. pension plans' obligations by $2.2 billion.
	In September 2011 a plan which provided legal services to U.S. hourly employees and retirees was remeasured as a result of our labor agreement provisions which terminated the plan effective December 31, 2013. The negotiated termination has been accounted for as a negative plan amendment resulting in a decrease in the OPEB liability and a pre-tax increase of $266 million in the prior service credit component of Accumulated other comprehensive loss was amortized through December 31, 2013.
	In March 2012 certain pension plans in GME were remeasured as part of our goodwill impairment testing, resulting in an increase of $150 million in the pension liability and a pre-tax increase in the net actuarial loss component of Accumulated other comprehensive loss.
	Pension and OPEB Obligations and Plan Assets
	The following table summarizes the change in benefit obligations and related plan assets (dollars in millions):
		Year Ended December 31, 2014														Year Ended December 31, 2013
		Pension Benefits								Other Benefits						Pension Benefits						Other Benefits
		U.S. Plans				Non-U.S. Plans				U.S. Plans			Non-U.S. Plans			U.S. Plans			Non-U.S. Plans			U.S. Plans			Non-U.S. Plans
	Change in benefit obligations
	Beginning benefit obligation	$	71,480			$	27,528			$	5,110		$	1,238		$	82,110		$	29,301		$	6,271		$	1,528
	Service cost	247				358				13			10			298			394			24			13
	Interest cost	3,060				1,031				218			55			2,837			1,010			217			57
	Amendments	—				17				—			—			—			(4		)	—			(4		)
	Actuarial (gains) losses	7,770				3,179				331			117			(7,661		)	(1,009		)	(757		)	(210		)
	Benefits paid	(5,779		)		(1,699		)		(376		)	(50		)	(5,719		)	(1,683		)	(422		)	(53		)
	Foreign currency translation adjustments	—				(2,536		)		—			(108		)	—			(528		)	—			(98		)
	Curtailments, settlements and other	(54		)		19				(7		)	74			(385		)	47			(223		)	5
	Ending benefit obligation	76,724				27,897				5,289			1,336			71,480			27,528			5,110			1,238
	Change in plan assets
	Beginning fair value of plan assets	64,166				14,986				—			—			68,085			15,541			—			—
	Actual return on plan assets	7,346				1,893				—			—			2,107			988			—			—
	Employer contributions	143				770				354			48			128			886			393			51
	Benefits paid	(5,779		)		(1,699		)		(376		)	(50		)	(5,719		)	(1,683		)	(422		)	(53		)
	Foreign currency translation adjustments	—				(1,232		)		—			—			—			(692		)	—			—
	Settlements and other	(53		)		(49		)		22			2			(435		)	(54		)	29			2
	Ending fair value of plan assets	65,823				14,669				—			—			64,166			14,986			—			—
	Ending funded status	$	(10,901	)		$	(13,228	)		$	(5,289	)	$	(1,336	)	$	(7,314	)	$	(12,542	)	$	(5,110	)	$	(1,238	)
	Amounts recorded in the consolidated balance sheets
	Non-current assets	$	—			$	111			$	—		$	—		$	—		$	137		$	—		$	—
	Current liabilities	(69		)		(383		)		(338		)	(58		)	(131		)	(379		)	(368		)	(83		)
	Non-current liabilities	(10,832		)		(12,956		)		(4,951		)	(1,278		)	(7,183		)	(12,300		)	(4,742		)	(1,155		)
	Net amount recorded	$	(10,901	)		$	(13,228	)		$	(5,289	)	$	(1,336	)	$	(7,314	)	$	(12,542	)	$	(5,110	)	$	(1,238	)
	Amounts recorded in Accumulated other comprehensive loss
	Net actuarial gain (loss)	$	452			$	(5,019	)		$	(859	)	$	(83	)	$	4,747		$	(3,379	)	$	(542	)	$	47
Net prior service (cost) credit	35				(57		)		16			72			38			(87		)	19			91
Total recorded in Accumulated other comprehensive loss	$	487			$	(5,076	)		$	(843	)	$	(11	)	$	4,785		$	(3,466	)	$	(523	)	$	138
The following table summarizes the total accumulated benefit obligations (ABO), the fair value of plan assets for defined benefit pension plans with ABO in excess of plan assets, and the projected benefit obligation (PBO) and fair value of plan assets for defined benefit pension plans with PBO in excess of plan assets (dollars in millions):
	December 31, 2014								December 31, 2013
	U.S. Plans				Non-U.S. Plans				U.S. Plans			Non-U.S. Plans
ABO	$	76,702			$	27,425			$	71,461		$	27,069
Plans with ABO in excess of plan assets
ABO	$	76,702			$	26,510			$	71,461		$	25,897
Fair value of plan assets	$	65,823			$	13,638			$	64,166		$	13,663
Plans with PBO in excess of plan assets
PBO	$	76,724			$	26,935			$	71,480		$	26,788
Fair value of plan assets	$	65,823			$	13,643			$	64,166		$	14,109
The following table summarizes the components of net periodic pension and OPEB expense along with the assumptions used to determine benefit obligations (dollars in millions):
	Year Ended December 31, 2014														Year Ended December 31, 2013												Year Ended December 31, 2012
	Pension Benefits								Other Benefits						Pension Benefits						Other Benefits						Pension Benefits						Other Benefits
	U.S. Plans				Non-U.S. Plans				U.S. Plans			Non-U.S. Plans			U.S. Plans			Non-U.S. Plans			U.S. Plans			Non-U.S. Plans			U.S. Plans			Non-U.S. Plans			U.S. Plans			Non-U.S. Plans
Components of expense
Service cost	$	380			$	389			$	13		$	10		$	395		$	425		$	24		$	13		$	590		$	411		$	23		$	16
Interest cost	3,060				1,031				218			55			2,837			1,010			217			57			4,055			1,110			234			63
Expected return on plan assets	(3,914		)		(873		)		—			—			(3,562		)	(823		)	—			—			(5,029		)	(870		)	—			—
Amortization of prior service cost (credit)	(4		)		17				(2		)	(14		)	(4		)	19			(116		)	(14		)	(1		)	1			(116		)	(12		)
Recognized net actuarial loss	(91		)		154				14			(6		)	6			208			85			6			2			35			52			6
Curtailments, settlements and other	(1		)		3				—			—			(77		)	(6		)	(62		)	—			2,580			71			—			11
Net periodic expense (income)	$	(570	)		$	721			$	243		$	45		$	(405	)	$	833		$	148		$	62		$	2,197		$	758		$	193		$	84
Weighted-average assumptions used to determine benefit obligations
Discount rate	3.73		%		3.14		%		3.8		%	3.99		%	4.46		%	4.1		%	4.52		%	4.71		%	3.59		%	3.7		%	3.68		%	3.97		%
Rate of compensation increase(a)	N/A				2.85		%		N/A			4.21		%	N/A			2.9		%	N/A			4.21		%	N/A			2.77		%	4.5		%	4.21		%
Weighted-average assumptions used to determine net expense
Discount rate	4.46		%		4.1		%		4.52		%	4.71		%	3.59		%	3.69		%	3.69		%	3.97		%	4.06		%	4.45		%	4.24		%	4.31		%
Expected rate of return on plan assets	6.53		%		6.28		%		N/A			N/A			5.77		%	5.7		%	N/A			N/A			6.18		%	6.2		%	N/A			N/A
Rate of compensation increase(a)	N/A				2.9		%		N/A			4.21		%	N/A			2.77		%	4.5		%	4.21		%	4.5		%	3.15		%	4.5		%	4.21		%
_________
(a)	As a result of ceasing the accrual of additional benefits for salaried plan participants, the rate of compensation increase does not have a significant effect on our U.S. pension and OPEB plans.
U.S. pension plan service cost includes administrative expenses of $133 million, $97 million and $138 million in the years ended December 31, 2014, 2013 and 2012. Weighted-average assumptions used to determine net expense are determined at the beginning of the period and updated for remeasurements. Non-U.S. pension plan administrative expenses included in service cost were insignificant in the years ended December 31, 2014, 2013 and 2012.
Estimated amounts to be amortized from Accumulated other comprehensive loss into net periodic benefit cost in the year ending December 31, 2015 based on December 31, 2014 plan measurements are $295 million, consisting primarily of amortization of the net actuarial loss in the non-U.S. pension plans.
Assumptions
Investment Strategies and Long-Term Rate of Return
Detailed periodic studies conducted by outside actuaries and an internal asset management group are used to determine the long-term strategic mix among asset classes, risk mitigation strategies and the expected long-term return on asset assumptions for the U.S. pension plans. The U.S. study includes a review of alternative asset allocation and risk mitigation strategies, anticipated future long-term performance and risk of the individual asset classes that comprise the plans' asset mix. Similar studies are performed for the significant non-U.S. pension plans with the assistance of outside actuaries and asset managers. While the studies incorporate data from recent plan performance and historical returns, the expected long-term return on plan asset assumptions are determined based on long-term prospective rates of return.
The strategic asset mix and risk mitigation strategies for the plans are tailored specifically for each plan. Individual plans have distinct liabilities, liquidity needs and regulatory requirements. Consequently there are different investment policies set by individual plan fiduciaries. Although investment policies and risk mitigation strategies may differ among plans, each investment strategy is considered to be appropriate in the context of the specific factors affecting each plan.
In setting new strategic asset mixes, consideration is given to the likelihood that the selected mixes will effectively fund the projected pension plan liabilities, while aligning with the risk tolerance of the plans' fiduciaries. The strategic asset mixes for U.S. defined benefit pension plans are increasingly designed to satisfy the competing objectives of improving funded positions (market value of assets equal to or greater than the present value of the liabilities) and mitigating the possibility of a deterioration in funded status.
Derivatives may be used to provide cost effective solutions for rebalancing investment portfolios, increasing or decreasing exposure to various asset classes and for mitigating risks, primarily interest rate and currency risks. Equity and fixed income managers are permitted to utilize derivatives as efficient substitutes for traditional physical securities. Interest rate derivatives may be used to adjust portfolio duration to align with a plan's targeted investment policy. Alternative investment managers are permitted to employ leverage, including through the use of derivatives, which may alter economic exposure.
In December 2014 an investment policy study was completed for the U.S. pension plans. The study resulted in new target asset allocations being approved for the U.S. pension plans with resulting changes to the expected long-term rate of return on assets. The weighted-average long-term rate of return on assets decreased from 6.5% at December 31, 2013 to 6.4% at December 31, 2014. The expected long-term rate of return on plan assets used in determining pension expense for non-U.S. plans is determined in a similar manner to the U.S. plans.
Target Allocation Percentages
The following table summarizes the target allocations by asset category for U.S. and non-U.S. defined benefit pension plans:
	December 31, 2014						December 31, 2013
	U.S. Plans			Non-U.S. Plans			U.S. Plans			Non-U.S. Plans
Equity	16	%		27	%		19	%		28	%
Debt	60	%		47	%		58	%		49	%
Other(a)	24	%		26	%		23	%		23	%
Total	100	%		100	%		100	%		100	%
__________
(a)	Primarily includes private equity, real estate and absolute return strategies which mainly consist of hedge funds.
Assets and Fair Value Measurements
The following tables summarize the fair value of U.S. defined benefit pension plan assets by asset class (dollars in millions):
	31-Dec-14														31-Dec-13
	Level 1				Level 2				Level 3			Total			Level 1			Level 2			Level 3			Total
Assets
Cash equivalents and other short-term investments	$	—			$	42			$	—		$	42		$	—		$	411		$	—		$	411
Common and preferred stocks	10,033				30				3			10,066			10,234			70			6			10,310
Government and agency debt securities(a)	—				16,143				—			16,143			—			14,971			—			14,971
Corporate and other debt securities(b)	—				22,725				83			22,808			—			20,647			130			20,777
Investment funds(c)	70				910				5,221			6,201			99			1,018			5,174			6,291
Private equity and debt investments(d)	—				—				5,909			5,909			—			—			6,335			6,335
Real estate investments(e)	560				2				3,608			4,170			390			4			4,127			4,521
Other investments	—				—				65			65			—			—			62			62
Derivative assets	55				313				1			369			17			157			—			174
Total assets	10,718				40,165				14,890			65,773			10,740			37,278			15,834			63,852
Liabilities
Derivative liabilities	(23		)		(496		)		—			(519		)	(22		)	(311		)	(6		)	(339		)
Net plan assets subject to leveling	$	10,695			$	39,669			$	14,890		65,254			$	10,718		$	36,967		$	15,828		63,513
Other plan assets and liabilities(f)												569												653
Net Plan Assets												$	65,823											$	64,166
The following tables summarize the fair value of non-U.S. defined benefit pension plan assets by asset class (dollars in millions):
	31-Dec-14														31-Dec-13
	Level 1				Level 2				Level 3			Total			Level 1			Level 2			Level 3			Total
Assets
Cash equivalents and other short-term investments	$	—			$	207			$	—		$	207		$	—		$	156		$	—		$	156
Common and preferred stocks	1,959				3				—			1,962			1,816			6			—			1,822
Government and agency debt securities(a)	—				3,614				—			3,614			—			3,418			—			3,418
Corporate and other debt securities(b)	—				1,986				—			1,986			—			2,475			14			2,489
Investment funds(c)	101				3,409				889			4,399			128			3,529			745			4,402
Private equity and debt investments(d)	—				—				509			509			—			—			430			430
Real estate investments(e)	20				4				1,263			1,287			13			12			1,405			1,430
Other investments	—				—				722			722			—			—			618			618
Derivative assets	17				24				—			41			3			44			—			47
Total assets	2,097				9,247				3,383			14,727			1,960			9,640			3,212			14,812
Liabilities
Derivative liabilities	—				(44		)		—			(44		)	(12		)	(56		)	—			(68		)
Net plan assets subject to leveling	$	2,097			$	9,203			$	3,383		14,683			$	1,948		$	9,584		$	3,212		14,744
Other plan assets and liabilities(f)												(14		)										242
Net Plan Assets												$	14,669											$	14,986
__________
(a)	Includes U.S. and sovereign government and agency issues.
(b)	Includes mortgage and asset-backed securities.
(c)	U.S. and non-U.S. Level 3 assets consist primarily of funds of hedge funds. Non-U.S. Level 2 assets consist primarily of equity and fixed income funds.
(d)	Includes private equity investment funds.
(e)	Includes investment funds and public real estate investment trusts.
(f)	Cash held by the plans, net of amounts receivable/payable for unsettled security transactions and payables for investment manager fees, custody fees and other expenses.
The following tables summarize the activity for U.S. defined benefit pension plan net assets measured at fair value using Level 3 inputs (dollars in millions):
	Balance at January 1, 2014				Net Realized/Unrealized				Purchases, Sales and			Transfers Into/Out of Level 3			Balance at December 31, 2014			Change in Unrealized Gains/(Losses) Attributable to Assets Held at
					Gains (Losses)				Settlements, Net									31-Dec-14
Common and preferred stocks	$	6			$	2			$	(5	)	$	—		$	3		$	—
Corporate and other debt securities	130				—				(41		)	(6		)	83			(4		)
Investment funds	5,174				231				(184		)	—			5,221			208
Private equity and debt investments	6,335				651				(1,077		)	—			5,909			27
Real estate investments	4,127				251				(770		)	—			3,608			68
Other investments	62				5				(2		)	—			65			5
Derivatives, net	(6		)		(4		)		11			—			1			—
Total net assets	$	15,828			$	1,136			$	(2,068	)	$	(6	)	$	14,890		$	304
	Balance at January 1, 2013				Net Realized/Unrealized				Purchases, Sales and			Transfers Into/Out of Level 3			Balance at December 31, 2013			Change in Unrealized Gains/(Losses) Attributable to Assets Held at
					Gains (Losses)				Settlements, Net									31-Dec-13
Common and preferred stocks	$	19			$	3			$	(16	)	$	—		$	6		$	1
Corporate and other debt securities	182				6				(58		)	—			130			(3		)
Investment funds	4,959				552				(337		)	—			5,174			537
Private equity and debt investments	6,400				926				(991		)	—			6,335			436
Real estate investments	4,335				458				(666		)	—			4,127			190
Other investments	63				(2		)		1			—			62			(2		)
Derivatives, net	(8		)		2				—			—			(6		)	1
Total net assets	$	15,950			$	1,945			$	(2,067	)	$	—		$	15,828		$	1,160
The following tables summarize the activity for non-U.S. defined benefit pension plan assets measured at fair value using Level 3 inputs (dollars in millions):
	Balance at January 1, 2014				Net Realized/Unrealized				Purchases, Sales and			Transfers Into/Out of Level 3			Effect of Foreign Currency			Balance at December 31, 2014			Change in Unrealized Gains/(Losses) Attributable to Assets Held at
					Gains (Losses)				Settlements, Net												31-Dec-14
Corporate and other debt securities	$	14			$	—			$	(13	)	$	—		$	(1	)	$	—		$	—
Investment funds	745				103				111			—			(70		)	889			103
Private equity and debt investments	430				100				20			—			(41		)	509			75
Real estate investments	1,405				48				(84		)	—			(106		)	1,263			44
Other investments	618				92				72			—			(60		)	722			76
Total assets	$	3,212			$	343			$	106		$	—		$	(278	)	$	3,383		$	298
	Balance at January 1, 2013				Net Realized/Unrealized				Purchases, Sales and			Transfers Into/Out of Level 3			Effect of Foreign Currency			Balance at December 31, 2013			Change in Unrealized Gains/(Losses) Attributable to Assets Held at
					Gains (Losses)				Settlements, Net												31-Dec-13
Corporate and other debt securities	$	5			$	1			$	7		$	1		$	—		$	14		$	1
Investment funds	641				110				27			—			(33		)	745			112
Private equity and debt investments	381				73				3			—			(27		)	430			53
Real estate investments	1,422				103				(57		)	—			(63		)	1,405			122
Other investments	665				(10		)		(43		)	—			6			618			4
Total assets	$	3,114			$	277			$	(63	)	$	1		$	(117	)	$	3,212		$	292
Investment Fund Strategies
Investment funds consist primarily of equity funds, fixed income funds and funds of hedge funds. Equity funds invest in U.S. common and preferred stocks as well as similar equity securities issued by companies incorporated, listed or domiciled in developed and/or emerging markets countries. Fixed income funds include investments in high quality funds and to a lesser extent, high yield funds. High quality fixed income funds invest in government securities, investment-grade corporate bonds and mortgage and asset-backed securities. High yield fixed income funds invest in high yield fixed income securities issued by corporations which are rated below investment grade. Funds of hedge funds represent funds that invest in a portfolio of hedge funds. Fund managers typically seek to achieve their objectives by allocating capital across a broad array of funds and/or investment managers. Other investment funds also included in this category primarily represent multi-strategy funds that invest in broadly diversified portfolios of equity, fixed income and derivative instruments.
Private equity and debt investments principally consist of investments in private equity and debt funds. These investments provide exposure to and benefit from long-term equity investments in private companies, including leveraged buy-outs, venture capital and distressed debt strategies.
Real estate investments include funds that invest in entities which are principally engaged in the ownership, acquisition, development, financing, sale and/or management of income-producing real estate properties, both commercial and residential. These funds typically seek long-term growth of capital and current income that is above average relative to public equity funds.
Significant Concentrations of Risk
The assets of the pension plans include certain private investment funds, private equity and debt securities, real estate investments and derivative instruments. Investment managers may be unable to quickly sell or redeem some or all of these investments at an amount close or equal to fair value in order to meet a plan's liquidity requirements or to respond to specific events such as deterioration in the creditworthiness of any particular issuer or counterparty.
Illiquid investments held by the plans are generally long-term investments that complement the long-term nature of pension obligations and are not used to fund benefit payments when currently due. Plan management monitors liquidity risk on an ongoing basis and has procedures in place that are designed to maintain flexibility in addressing plan-specific, broader industry and market liquidity events.
The pension plans may invest in financial instruments denominated in foreign currencies and may be exposed to risks that the foreign currency exchange rates might change in a manner that has an adverse effect on the value of the foreign currency denominated assets or liabilities. Forward currency contracts may be used to manage and mitigate foreign currency risk.
The pension plans may invest in fixed income securities for which any change in the relevant interest rates for particular securities might result in an investment manager being unable to secure similar returns upon the maturity or the sale of securities. In addition, changes to prevailing interest rates or changes in expectations of future interest rates might result in an increase or decrease in the fair value of the securities held. Interest rate swaps and other financial derivative instruments may be used to manage interest rate risk.
Counterparty credit risk is the risk that a counterparty to a financial instrument will default on its commitment. Counterparty risk is primarily related to over-the-counter derivative instruments used to manage risk exposures related to interest rates on long-term debt securities and foreign currency exchange rate fluctuations. The risk of default can be influenced by various factors including macro-economic conditions, market liquidity, fiscal and monetary policies and counterparty-specific characteristics and activities. Certain agreements with counterparties employ set-off, collateral support arrangements and other risk mitigating procedures designed to reduce the net exposure to credit risk in the event of counterparty default. Credit policies and processes are in place to manage concentrations of counterparty risk by seeking to undertake transactions with large well-capitalized counterparties and by monitoring the creditworthiness of these counterparties. The majority of derivatives held by the plans at December 31, 2014 were fully collateralized and therefore, the related counterparty credit risk was significantly reduced.
Pension Funding Requirements
We are subject to a variety of U.S. federal rules and regulations, including the Employee Retirement Income Security Act of 1974, as amended and the Pension Protection Act of 2006, which govern the manner in which we fund and administer our U.S. pension plans. The Moving Ahead for Progress in the 21st Century Act which expired on September 30, 2014 allowed plan sponsors funding relief for pension plans through the application of higher funding interest rates. The 2014 Highway and Transportation Funding Act extended the application of higher funding interest rates. As a result, utilizing current assumptions we expect no significant mandatory contributions to our U.S. qualified pension plans for the next five years. We have no funding requirements for our U.S. qualified plans in 2015.
We also maintain pension plans for employees in a number of countries outside the U.S. which are subject to local laws and regulations. Except for Canada and the United Kingdom, most non-U.S. pension laws and regulations do not have specific funding requirements.
Benefit Payments
The following table summarizes net benefit payments expected to be paid in the future, which include assumptions related to estimated future employee service (dollars in millions):
	Pension Benefits(a)								Other Benefits
	U.S. Plans				Non-U.S. Plans				U.S. Plans			Non-U.S. Plans
2015	$	5,616			$	1,530			$	344		$	59
2016	$	5,572			$	1,570			$	331		$	63
2017	$	5,380			$	1,558			$	322		$	61
2018	$	5,239			$	1,458			$	313		$	63
2019	$	5,128			$	1,448			$	307		$	65
2020 - 2024	$	23,754			$	7,136			$	1,470		$	348
__________
(a)	Benefits for most U.S. pension plans and certain non-U.S. pension plans are paid out of plan assets rather than our Cash and cash equivalents.

Derivative_Financial_Instrumen

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments [Text Block]	Derivative Financial Instruments
	Automotive
	At December 31, 2014 and 2013 our derivative instruments consisted primarily of options and forward contracts primarily related to foreign currency, none of which were designated as hedging relationships. We had derivative instruments in asset positions with notional amounts of $8.8 billion and $9.3 billion and liability positions with notional amounts of $953 million and $427 million at December 31, 2014 and 2013. The fair value of these derivative instruments was insignificant.
	Automotive Financing - GM Financial
	GM Financial had interest rate swaps and caps and foreign currency swaps in asset positions with notional amounts of $5.4 billion and $5.5 billion and liability positions with notional amounts of $8.5 billion and $7.6 billion at December 31, 2014 and 2013. The fair value of these derivative financial instruments was insignificant.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies [Text Block]	Commitments and Contingencies
	The following tables summarize information related to commitments and contingencies (dollars in millions):
		December 31, 2014						December 31, 2013
		Liability Recorded			Maximum Liability(a)			Liability Recorded			Maximum Liability(a)
	Guarantees
	Third-party commercial loans and other obligations(b)	$	37		$	197		$	51		$	15,616
	Other product-related claims	$	51		$	2,458		$	54		$	1,317
	__________
	(a)	Calculated as future undiscounted payments.
	(b)	Includes liabilities recorded of $10 million and maximum liabilities of $15.3 billion related to Ally Financial repurchase obligations at December 31, 2013.
		Liability Recorded
		December 31, 2014			December 31, 2013
	Other litigation-related liability and tax administrative matters	$	1,000		$	1,227
	Product liability	$	732		$	690
	Ignition switch recall compensation program	$	315
	Credit card programs(a)
	Redemption liability(b)	$	87		$	183
	Deferred revenue(c)	$	263		$	295
	Environmental liability	$	133		$	154
	Asset retirement obligations	$	146		$	159
	__________
	(a)	Credit card programs offer rebates that can be applied primarily against the purchase or lease of our vehicles. At December 31, 2014 and 2013 qualified cardholders had rebates available, net of deferred program revenue, of approximately $2.3 billion and $2.6 billion.
	(b)	Recorded in Accrued liabilities.
	(c)	Recorded in Other liabilities.
	Guarantees
	We provide payment guarantees on commercial loans outstanding with third parties such as dealers or rental car companies. We determined the fair value ascribed to the guarantees at inception and subsequent to inception to be insignificant based on the credit worthiness of the third parties. In March 2014 a new agreement was signed with Ally Financial that removed the repurchase obligation for vehicles invoiced after December 31, 2013. The repurchase obligation for vehicles invoiced prior to December 31, 2013 was maintained until December 31, 2014 at which time repurchase obligations expired for all vehicles.
	Agreements with third parties that guarantee the fulfillment of certain suppliers' commitments and other obligations expire in 2015 through 2019 or upon the occurrence of specific events or are ongoing.
	In some instances certain assets of the party whose debt or performance we have guaranteed may offset, to some degree, the cost of the guarantee. The offset of certain of our payables to guaranteed parties may also offset certain guarantees, if triggered. If vehicles are required to be repurchased under vehicle repurchase obligations, the total exposure would be reduced to the extent vehicles are able to be resold to another dealer.
	In connection with certain divestitures of assets or operating businesses, we have entered into agreements indemnifying certain buyers and other parties with respect to environmental conditions and other closure costs pertaining to real property we owned. We periodically enter into agreements that incorporate indemnification provisions in the normal course of business. It is not possible to estimate our maximum exposure under these indemnifications or guarantees due to the conditional nature of these obligations. Insignificant amounts have been recorded for such obligations as the majority of them are not probable or estimable at this time and the fair value of the guarantees at issuance was insignificant. In addition, we indemnify dealers for certain product liability related claims as subsequently discussed.
	With respect to other product-related claims involving products manufactured by certain joint ventures, we believe that costs incurred are adequately covered by recorded accruals. These guarantees terminate in years ranging from 2020 to 2029.
	Other Litigation-Related Liability and Tax Administrative Matters
	Various legal actions, governmental investigations, claims and proceedings are pending against us including matters arising out of alleged product defects; employment-related matters; governmental regulations relating to safety, emissions and fuel economy; product warranties; financial services; dealer, supplier and other contractual relationships; tax-related matters not recorded pursuant to ASC 740, "Income Taxes" (indirect tax-related matters) and environmental matters.
	With regard to the litigation matters discussed in the previous paragraph, reserves have been established for matters in which we believe that losses are probable and can be reasonably estimated, the majority of which are associated with indirect tax-related matters as well as non-U.S. labor-related matters. Indirect tax-related matters are being litigated globally pertaining to value added taxes, customs, duties, sales, property taxes and other non-income tax related tax exposures. The various non-U.S. labor-related matters include claims from current and former employees related to alleged unpaid wage, benefit, severance and other compensation matters. Certain South American administrative proceedings are indirect tax-related and may require that we deposit funds in escrow. Escrow deposits may range from $500 million to $700 million. Some of the matters may involve compensatory, punitive or other treble damage claims, environmental remediation programs or sanctions that, if granted, could require us to pay damages or make other expenditures in amounts that could not be reasonably estimated at December 31, 2014. We believe that appropriate accruals have been established for such matters based on information currently available. Reserves for litigation losses are recorded in Accrued liabilities and Other liabilities. Litigation is inherently unpredictable however; and unfavorable resolutions could occur. Accordingly it is possible that an adverse outcome from such proceedings could exceed the amounts accrued in an amount that could be material to our financial condition, results of operations and cash flows in any particular reporting period.
	Proceedings Related to Ignition Switch and Other Recalls
	In the three months ended March 31, 2014 we announced recalls to repair ignition switches that under certain circumstances could unintentionally move from the “run” position to the “accessory” or “off” position with a corresponding loss of power, which in turn may prevent airbags from deploying in the event of a crash. Those recalls included Chevrolet Cobalt and HHR, Pontiac G5, Pursuit and Solstice and Saturn ION and Sky vehicles. Since those recalls, we have announced a number of additional recalls in the year ended December 31, 2014 relating to safety, customer satisfaction and other matters.
	Through January 30, 2015 we are aware of 108 putative class actions that are pending against GM in various U.S. District Courts and state courts alleging that consumers who purchased or leased GM vehicles have been economically harmed by one or more of the recalls announced this year and/or the underlying vehicle conditions associated with those recalls (economic-loss cases). Additionally, through January 30, 2015, 20 putative class actions have been filed in various Provincial Courts in Canada seeking similar relief as the U.S.-based cases. In the aggregate, these economic-loss cases seek recovery for purported compensatory damages, including alleged diminution in value of the vehicles, punitive damages, and injunctive and other relief. In addition through January 30, 2015, we are aware of 104 actions pending against GM alleging injury or death as a result of defects that may be the subject of recalls announced in the year ended December 31, 2014, including faulty ignition switches and/or the failure of air bags to properly deploy due to faulty ignition switches (personal injury cases). In the aggregate these personal injury cases seek recovery for purported compensatory damages, punitive damages and other relief.
	Since June 2014 the United States Judicial Panel on Multidistrict Litigation has issued orders from time to time directing that certain pending economic-loss and personal injury federal lawsuits involving alleged faulty ignition switches or other defects that may be related to the recalls announced in 2014 be transferred to, and consolidated in, a single federal court, the Southern District of New York (the multidistrict litigation). Through January 30, 2015, 156 cases have been transferred and consolidated as part of the multidistrict litigation. We have requested that various other recently filed federal lawsuits also be transferred and consolidated in the multidistrict litigation. The court in the multidistrict litigation has appointed lead counsel to prosecute the claims on behalf of all plaintiffs in the consolidated cases. On October 14, 2014 lead counsel filed two amended consolidated complaints. Because the majority of plaintiffs in these actions are suing over vehicles manufactured by pre-bankruptcy General Motors Corporation, we are seeking to enforce the terms of the federal Bankruptcy Court’s July 2009 Sale Order and Injunction to preclude liability for any economic loss damages based on vehicles and parts manufactured prior to July 2009. These cases are in their early stages. In addition to the cases pending in the multidistrict litigation, other economic-loss and personal injury cases related to ignition-switch and other alleged defects that may be the subject of recalls in 2014 are pending in various other state and federal courts throughout the country. The cases pending in other state courts include a November 19, 2014 lawsuit filed by the Attorney General for Arizona against GM in Arizona state court alleging claims similar to those alleged in the economic-loss actions discussed above and seeking an injunction, civil penalties and other relief.
	Through January 30, 2015 we are aware of two actions that have been filed against GM alleging that GM’s purported concealment of the ignition switch and other defects that have been the subject of recalls in 2014 has diminished the value of other GM vehicles and seeking economic damages under California consumer protection statutes. One of these actions is a putative class action that has been consolidated with the ignition switch putative class actions and transferred to the Southern District of New York. The other action was brought by the Orange County, California district attorney and is pending in California state court. In the aggregate, these actions seek recovery under California consumer protection statutes for economic damages as well as civil penalties, punitive damages, attorneys’ fees and costs.
	On March 21, 2014 a putative shareholder class action was filed in the United States District Court for the Eastern District of Michigan against GM and various current and former officers or employees of GM (Pio v. General Motors Company et al.) on behalf of purchasers of GM securities from November 17, 2010 through March 10, 2014. The complaint alleges that defendants made material misstatements and omissions relating to problems with the ignition switch and other matters in SEC filings. Plaintiffs seek unspecified monetary damages, interest and attorneys’ fees and costs. The court appointed the New York State Teachers’ Retirement System as the lead plaintiff. On January 15, 2015 New York State Teachers’ Retirement System filed a Consolidated Class Action Complaint against GM and several current and former officers and employees. The Consolidated Class Action Complaint supersedes the complaint filed March 21, 2014 in this same case.
	On March 28, 2014 a shareholder derivative action was filed in the United States District Court for the Eastern District of Michigan against certain current and former GM directors (Hockstein v. Barra, et al.). The complaint alleges breach of fiduciary duty, waste of corporate assets, and unjust enrichment by GM’s directors in connection with monitoring, remediation and disclosure of the issues underlying the ignition switch recall. Between April 9, 2014 and July 22, 2014, similar shareholder derivative actions were filed in the Eastern District of Michigan (Police Retirement System of St. Louis v. Barra, et al.), the Circuit Court for Wayne County, Michigan (Bekkerman v. Barra, et al., Wietschiner, et al. v. Barra, et al.) and the Chancery Court for the State of Delaware (Nash v. Barra, et al., DiStefano v. Barra, et al., Newspaper and Magazine Employees Union v. Barra, et al., Boso v. Solso, et al.). All of these actions seek damages allegedly resulting from defendants’ failure to timely identify, correct and disclose the ignition switch defect, an order compelling implementation of various corporate governance policies and practices and other relief purportedly for the benefit of GM.
	With regard to the two above listed shareholder derivative actions pending in the United States District Court for the Eastern District of Michigan against certain current and former GM directors, those actions have been consolidated and we filed a motion to dismiss the consolidated amended complaint on October 9, 2014. On January 11, 2015 the court issued an order suspending further proceedings in the actions and holding our motion to dismiss in abeyance pending disposition of the parallel action currently being litigated in Delaware Chancery Court (In re General Motors Deriv. Litig., C.A. No. 9627-VCG). With regard to that pending litigation in Delaware Chancery Court, the four above listed shareholder derivative actions pending in that court have been consolidated and plaintiffs filed an amended consolidated complaint on October 13, 2014. We filed a motion to dismiss the amended consolidated complaint on December 5, 2014. With regard to the two above listed derivative actions filed in the Circuit Court of Wayne County, Michigan, those actions have been consolidated and stayed pending the federal derivative actions.
	We are also the subject of various inquiries, investigations, subpoenas and requests for information from the U.S. Attorney’s Office for the Southern District of New York, Congress, the SEC, Transport Canada and 49 state attorneys general in connection with the 2014 recalls. We are investigating these matters and believe we are cooperating fully with all requests. Such investigations and discussions could in the future result in the imposition of material damages, fines or civil and criminal penalties and other remedies.
	We are currently unable to estimate a range of reasonably possible loss for the lawsuits and investigations because these matters involve significant uncertainties at these early stages. These uncertainties include the legal theory or the nature of the claims as well as the complexity of the facts. Although we cannot estimate a reasonable range of loss based on currently available information, the resolution of these matters could have a material adverse effect on our financial position, results of operations or cash flows.
	GMCL Dealers' Claim
	On February 12, 2010 a claim was filed in the Ontario Superior Court of Justice against General Motors of Canada Limited (GMCL) on behalf of a purported class of over 200 former GMCL dealers (the Plaintiff Dealers) which had entered into wind-down agreements with GMCL. In May 2009 in the context of the global restructuring of the business and the possibility that GMCL might be required to initiate insolvency proceedings, GMCL offered the Plaintiff Dealers the wind-down agreements to assist with their exit from the GMCL dealer network and to facilitate winding down their operations in an orderly fashion by December 31, 2009 or such other date as GMCL approved but no later than on October 31, 2010. The Plaintiff Dealers allege that the Dealer Sales and Service Agreements were wrongly terminated by GMCL and that GMCL failed to comply with certain disclosure obligations, breached its statutory duty of fair dealing and unlawfully interfered with the Plaintiff Dealers' statutory right to associate in an attempt to coerce the Plaintiff Dealers into accepting the wind-down agreements. The Plaintiff Dealers seek damages and assert that the wind-down agreements are rescindable. The Plaintiff Dealers' initial pleading makes reference to a claim “not exceeding” CAD $750 million, without explanation of any specific measure of damages. On March 1, 2011 the court approved certification of a class for the purpose of deciding a number of specifically defined issues including: (1) whether GMCL breached its obligation of "good faith" in offering the wind-down agreements; (2) whether GMCL interfered with the Plaintiff Dealers' rights of free association; (3) whether GMCL was obligated to provide a disclosure statement and/or disclose more specific information regarding its restructuring plans in connection with proffering the wind-down agreements; and (4) assuming liability, whether the Plaintiff Dealers can recover damages in the aggregate (as opposed to proving individual damages). A number of former dealers have opted out of participation in the litigation, leaving 181 dealers in the certified class. Trial of the class issues was completed in the fourth quarter of 2014. We are now awaiting a decision from the Ontario Superior Court. The current prospects for liability are uncertain, but because liability is not deemed probable we have no accrual relating to this litigation. We cannot estimate the range of reasonably possible loss in the event of liability as the case presents a variety of different legal theories, none of which GMCL believes are valid.
	UAW Claim
	On April 6, 2010 the UAW filed suit against us in the U.S. District Court for the Eastern District of Michigan claiming that we breached our obligation to contribute $450 million to the New VEBA. The UAW alleges that we were contractually required to make this contribution pursuant to the UAW-Delphi-GM Memorandum of Understanding Delphi Restructuring dated June 22, 2007. We believe this claim is without merit. On December 10, 2013 the court granted our motion for summary judgment and dismissed the claims asserted by the UAW, holding that the relevant agreement is unambiguous and does not require the payment sought. The UAW has appealed. On October 9, 2014 the United States Court of Appeals for the Sixth Circuit heard oral arguments. We are now awaiting a decision from the United States Court of Appeals for the Sixth Circuit.
	GM Korea Wage Litigation
	Commencing on or about September 29, 2010 current and former hourly employees of GM Korea filed eight separate group actions in the Incheon District Court in Incheon, Korea. The cases, which in aggregate involve more than 10,000 employees, allege that GM Korea failed to include bonuses and certain allowances in its calculation of Ordinary Wages due under the Presidential Decree of the Korean Labor Standards Act. On November 23, 2012 the Seoul High Court (an intermediate level appellate court) issued a decision affirming a decision of the Incheon District Court in a case involving five GM Korea employees which was contrary to GM Korea's position. GM Korea appealed to the Supreme Court of the Republic of Korea (Supreme Court) and initiated a constitutional challenge to the adverse interpretation of the relevant statute. In December 2013 the Supreme Court rendered a decision in a case involving another company not affiliated with us which addressed many of the issues presented in the cases pending against GM Korea and resolved many of them in a manner which we believe is favorable to GM Korea. In particular, while the Supreme Court held that fixed bonuses should be included in the calculation of Ordinary Wages, it also held that claims for retroactive application of this rule would be barred under certain circumstances. On May 29, 2014 the Supreme Court rendered its decision with respect to the case involving the five GM Korea employees and remanded the case to the Seoul High Court consistent with its December 2013 ruling. In July 2014 GM Korea and its labor union agreed to include bonuses and certain allowances in ordinary wages retroactively to March 1, 2014. Therefore our accrual related to these cases was reclassified from a contingent liability to the Pensions liability. We estimate our reasonably possible loss, as defined by ASC 450, “Contingencies,” in excess of amounts accrued to be 562 billion South Korean Won (equivalent to $511 million) at December 31, 2014, which relates to periods before March 1, 2014. We are also party to litigation with current and former salaried employees over allegations relating to Ordinary Wages regulation. At December 31, 2014 we have identified a reasonably possible loss in excess of the amount of our accrual of 164 billion South Korean Won (equivalent to $149 million). Both the scope of claims asserted and GM Korea's assessment of any or all of the individual claim elements may change if new information becomes available. These cases are currently pending before various district courts in Korea and the Supreme Court.
	Inventory Management Securities Class Action
	On June 29, 2012 a putative securities class action was filed against us and a number of our past and current officers and directors in the United States District Court for the Southern District of New York (George G. Scott v. General Motors Company et al). Purporting to sue on behalf of owners of common stock deriving from our 2010 initial public offering, plaintiff asserts non-fraud prospectus based liability claims under various federal securities statutes alleging that the Company has made false statements about its vehicle inventory controls and production decisions, particularly with respect to full-size trucks. The plaintiff's complaint requests compensatory damages, rescission and litigation costs, fees and disbursements. On November 21, 2012 the court appointed the Teamster's Local 710 Pension Fund as lead plaintiff in the matter. On February 1, 2013 the plaintiff filed an amended complaint. On September 4, 2014 the district court granted our motion to dismiss, and dismissed the case with prejudice. Plaintiff filed an appeal.
	GM Financial Subpoena
	In July 2014 GM Financial was served with a subpoena by the U.S. Department of Justice directing GM Financial to produce certain documents relating to GM Financial’s and its subsidiaries’ and affiliates’ origination and securitization of sub-prime automobile loans since 2007 in connection with an investigation by the U.S. Department of Justice in contemplation of a civil proceeding for potential violations of the Financial Institutions Reform, Recovery, and Enforcement Act of 1989. Among other matters, the subpoena requests information relating to the underwriting criteria used to originate these automobile loans and the representations and warranties relating to those underwriting criteria that were made in connection with the securitization of the automobile loans. GM Financial was subsequently served with additional investigative subpoenas to produce documents from state attorneys general and other governmental offices relating to its sub-prime automotive finance business and securitization of sub-prime automobile loans. In October 2014 GM Financial received a document request from the SEC in connection with its investigation into certain practices in sub-prime automobile loan securitization. GM Financial is investigating these matters internally and believes that it is cooperating with all requests. Such investigations could in the future result in the imposition of damages, fines or civil or criminal claims and/or penalties. No assurance can be given that the ultimate outcome of the investigations or any resulting proceedings would not materially and adversely affect GM Financial or any of its subsidiaries and affiliates.
	Product Liability
	With respect to product liability claims involving our and General Motors Corporation's products, we believe that any judgment against us for actual damages will be adequately covered by our recorded accruals and, where applicable, excess liability insurance coverage. Although punitive damages are claimed in some of these lawsuits and such claims are inherently unpredictable, accruals incorporate historic experience with these types of claims. In addition we indemnify dealers for certain product liability related claims including products sold by General Motors Corporation's dealers. We monitor actual claims experience and make periodic adjustments to our estimates. Liabilities have been recorded in Accrued liabilities and Other liabilities for the expected cost of all known product liability claims plus an estimate of the expected cost for product liability claims that have already been incurred and are expected to be filed in the future for which we are self-insured. In light of recent vehicle recalls it is reasonably possible that our accruals for product liability claims may increase in future periods in material amounts, although we cannot estimate a reasonable range of incremental loss based on currently available information.
	Ignition Switch Recall Compensation Program
	In the three months ended June 30, 2014 we announced the creation of a compensation program (the Program) to compensate accident victims who died or suffered physical injury (or their families) as a result of a faulty ignition switch related to the 2.6 million vehicles recalled as more fully described in Note 13. It is important to our company that we reach everyone through this Program who has been impacted. The Program is being administered by an independent program administrator. The independent administrator has established a protocol that defines the eligibility requirements to participate in the Program. There is no cap on the amount of payments that can be made to claimants under the Program.
	At December 31, 2014 we have an accrual of $315 million recorded in Corporate which represents our best estimate of remaining amounts that may be paid under the Program. However, it is reasonably possible that the liability could exceed our recorded amount by approximately $200 million. The most significant estimates affecting the amount recorded include the number of participants that have eligible claims related to death and physical injury, which also contemplates the severity of injury, the length of hospital stays and related compensation amounts and the number of people who actually elect to participate in the Program. Our estimate is subject to significant uncertainties, as programs of this nature are highly unusual and each eligible claim will have a unique underlying fact pattern. While we do not anticipate material changes to our current estimate, it is possible that material changes could occur should actual eligible claims and the related compensation amounts differ from this estimate. The Program accepted claims from August 1, 2014 through January 31, 2015. Payments to eligible claimants began in the fourth quarter 2014 and will continue through the first half of 2015. Accident victims (or their families) could choose not to participate in the Program and pursue litigation against us. At January 30, 2015 the Program had received 3,810 claims and the independent program administrator has determined 128 claims to be eligible for payment under the Program. Remaining claims are either under review, deficient awaiting further documentation or deemed ineligible. Based on currently available information we believe our accrual at December 31, 2014 is adequate to cover the estimated costs under the Program. At January 30, 2015 we have paid $93 million to eligible claimants under the Program. Accident victims that accept a payment under the Program agree to settle all claims against GM related to the accident.
	Environmental Liability
	Automotive operations, like operations of other companies engaged in similar businesses, are subject to a wide range of environmental protection laws, including laws regulating air emissions, water discharges, waste management and environmental remediation. Liabilities have been recorded primarily in Other liabilities for the expected costs to be paid over the periods of remediation for the applicable sites, which typically range from five to 30 years.
	The final outcome of environmental matters cannot be predicted with certainty at this time. Subsequent adjustments to initial estimates are recorded as necessary based upon additional information obtained. In future periods new laws or regulations, advances in remediation technologies and additional information about the ultimate remediation methodology to be used could significantly change our estimates. It is possible that the resolution of one or more environmental matters could exceed the amounts accrued in an amount that could be material to our financial condition, results of operations and cash flows. At December 31, 2014 we estimate the remediation losses could range from $110 million to $210 million.
	Other Matters
	Brazil Excise Tax Incentive
	In October 2012 the Brazilian government issued a decree which increased an excise tax rate by 30 percentage points, but also provided an offsetting tax incentive that requires participating companies to meet certain criteria, such as local investment and fuel efficiency standards. Participating companies that fail to meet the required criteria are subject to clawback provisions and fines. At December 31, 2014 we believe it is reasonably assured that the program requirements will be met based on the current business model and available technologies.
Korea Fuel Economy Certification
We determined the certified fuel economy ratings on our Cruze 1.8L gasoline vehicles sold in Korea were incorrect. We re-tested and re-certified the Cruze fuel economy ratings which fell below our prior certification and self-reported this issue to local government authorities. We voluntarily announced a customer compensation program for current and previous Cruze owners and recorded an insignificant charge in the three months ended December 31, 2014.
In November 2014 the Korean government released new fuel economy certification guidelines. We are reviewing the impact the new testing guidelines may have on the domestic fuel economy certification ratings of our products.
India Tavera Emissions Compliance
We determined there was an emissions compliance issue with certain Tavera models produced in India. We self-reported this issue in the three months ended September 30, 2013 to local government authorities and are continuing to cooperate. We developed a solution, and while the issue was not safety related, we voluntarily recalled the vehicles to serve our customers. We believe our accrual at December 31, 2014 is adequate to cover the estimated costs of the recalled vehicles.
Noncancelable Operating Leases
The following table summarizes our minimum commitments under noncancelable operating leases having initial terms in excess of one year, primarily for property (dollars in millions):
	2015			2016			2017			2018			2019			Thereafter
Minimum commitments(a)	$	348		$	280		$	196		$	171		$	144		$	396
Sublease income	(53		)	(62		)	(59		)	(56		)	(54		)	(248		)
Net minimum commitments	$	295		$	218		$	137		$	115		$	90		$	148
__________
(a)	Certain of the leases contain escalation clauses and renewal or purchase options.
Rental expense under operating leases was $444 million, $477 million and $474 million in the years ended December 31, 2014, 2013 and 2012.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes [Text Block]	Income Taxes
	The following table summarizes income (loss) before income taxes and equity income (dollars in millions):
		Years Ended December 31,
		2014			2013			2012
	U.S. income (loss)	$	1,683		$	4,880		$	(19,063	)
	Non-U.S. income (loss)	469			768			(11,194		)
	Income (loss) before income taxes and equity income	$	2,152		$	5,648		$	(30,257	)
	Income Tax Expense (Benefit)
	The following table summarizes Income tax expense (benefit) (dollars in millions):
		Years Ended December 31,
		2014			2013			2012
	Current income tax expense (benefit)
	U.S. federal	$	(23	)	$	(34	)	$	6
	U.S. state and local	154			88			78
	Non-U.S.	671			512			646
	Total current income tax expense	802			566			730
	Deferred income tax expense (benefit)
	U.S. federal	(581		)	1,049			(28,965		)
	U.S. state and local	(60		)	137			(3,415		)
	Non-U.S.	67			375			(3,181		)
	Total deferred income tax expense (benefit)	(574		)	1,561			(35,561		)
	Total income tax expense (benefit)	$	228		$	2,127		$	(34,831	)
	Provisions are made for estimated U.S. and non-U.S. income taxes, less available tax credits and deductions, which may be incurred on the remittance of our basis differences in investments in foreign subsidiaries and corporate joint ventures not deemed to be indefinitely reinvested. Taxes have not been provided on basis differences in investments primarily as a result of earnings in foreign subsidiaries and corporate joint ventures which are deemed indefinitely reinvested of $3.0 billion and $2.6 billion at December 31, 2014 and 2013. Additional basis differences related to investments in nonconsolidated China JVs exist of $4.1 billion at December 31, 2014 and 2013 primarily related to fresh-start reporting. Quantification of the deferred tax liability, if any, associated with indefinitely reinvested basis differences is not practicable.
	The following table summarizes a reconciliation of Income tax expense (benefit) compared with the amounts at the U.S. federal statutory income tax rate (dollars in millions):
		Years Ended December 31,
		2014			2013			2012
	Income tax expense (benefit) at U.S. federal statutory income tax rate	$	753		$	1,977		$	(10,590	)
	State and local tax expense	73			145			254
	Non-U.S. income taxed at other than 35%	(72		)	(168		)	908
	Foreign tax credit election change	—			—			(1,075		)
	U.S. tax on Non-U.S. income	(8		)	543			713
	Change in valuation allowance	(402		)	182			(33,917		)
	Change in tax laws	602			146			67
	Research incentives	(279		)	(490		)	(68		)
	Goodwill impairment	41			124			8,705
	Settlements of prior year tax matters	(275		)	(473		)	—
	Realization of basis differences in affiliates	(256		)	—			—
	Foreign currency remeasurement	124			(21		)	(36		)
	U.S. salaried pension plan settlement	—			—			541
	Other adjustments	(73		)	162			(333		)
	Total income tax expense (benefit)	$	228		$	2,127		$	(34,831	)
	Deferred Income Tax Assets and Liabilities
	Deferred income tax assets and liabilities at December 31, 2014 and 2013 reflect the effect of temporary differences between amounts of assets, liabilities and equity for financial reporting purposes and the bases of such assets, liabilities and equity as measured by tax laws, as well as tax loss and tax credit carryforwards. The following table summarizes the components of temporary differences and carryforwards that give rise to deferred tax assets and liabilities (dollars in millions):
		December 31, 2014			December 31, 2013
	Deferred tax assets
	Postretirement benefits other than pensions	$	2,958		$	2,902
	Pension and other employee benefit plans	7,503			5,469
	Warranties, dealer and customer allowances, claims and discounts	5,512			4,282
	Property, plants and equipment	2,323			2,464
	Capitalized research expenditures	8,588			7,179
	Operating loss and tax credit carryforwards(a)	14,136			19,342
	Miscellaneous	3,286			1,663
	Total deferred tax assets before valuation allowances	44,306			43,301
	Less: valuation allowances	(9,659		)	(10,823		)
	Total deferred tax assets	34,647			32,478
	Deferred tax liabilities
	Intangible assets	416			397
	Net deferred tax assets	$	34,231		$	32,081
	_________
	(a)	Includes operating loss and tax credit carryforwards of $8.9 billion expiring through 2034 and $5.2 billion that may be carried forward indefinitely at December 31, 2014.
	At December 31, 2014 and 2013 valuation allowances against deferred tax assets were primarily in GME and South Korea business units and in the U.S. and Canada related primarily to capital loss tax attributes and state operating loss carryforwards.
	At December 31, 2014 our European businesses had deferred tax asset valuation allowances of $4.9 billion. As a result of the changes in our European operating structure and improving financial performance in certain jurisdictions, we are experiencing positive evidence trends in certain operations. If these operations generate profits and taxable income in the future, it is reasonably possible our conclusion regarding the need for full valuation allowances could change, resulting in the reversal of significant portions of the valuation allowances. In the quarter in which significant valuation allowances are reversed, we will record a material tax benefit reflecting the reversal, which could result in a negative effective tax rate for both the quarter and full year.
	At December 31, 2012 as a result of sustained profitability in the U.S. and Canada evidenced by three years of earnings and the completion of our near- and medium-term business plans in the three months ended December 31, 2012 that forecast continuing profitability, we determined it was more likely than not future earnings will be sufficient to realize deferred tax assets in these two jurisdictions. Accordingly we reversed most of the U.S. and Canadian valuation allowances resulting in non-cash income tax benefits of $33.2 billion and $3.1 billion.
	Uncertain Tax Positions
The following table summarizes activity of the total amounts of unrecognized tax benefits (dollars in millions):
	Years Ended December 31,
	2014			2013			2012
Beginning balance	$	2,530		$	2,745		$	2,370
Additions to current year tax positions	184			251			112
Additions to prior years' tax positions	149			276			512
Reductions to prior years' tax positions	(603		)	(535		)	(141		)
Reductions in tax positions due to lapse of statutory limitations	(164		)	(73		)	(34		)
Settlements	(138		)	(132		)	(112		)
Other	(81		)	(2		)	38
Ending balance	$	1,877		$	2,530		$	2,745
At December 31, 2014 and 2013 there were $1.2 billion and $1.5 billion of unrecognized tax benefits that if recognized would favorably affect our effective tax rate in the future. In the years ended December 31, 2014, 2013 and 2012 income tax related interest and penalties were insignificant. At December 31, 2014 and 2013 we had liabilities of $246 million and $286 million for income tax related interest and penalties.
In the year ended December 31, 2013 we remeasured a previously disclosed uncertain tax position and recorded a $473 million tax benefit that increased net operating loss carryforwards, reducing future taxable income.
At December 31, 2014 it is not possible to reasonably estimate the expected change to the total amount of unrecognized tax benefits in the next twelve months.
Other Matters
Income tax returns are filed in multiple jurisdictions and are subject to examination by taxing authorities throughout the world. We have open tax years from 2006 to 2014 with various significant tax jurisdictions. These open years contain matters that could be subject to differing interpretations of applicable tax laws and regulations as they relate to the amount, character, timing or inclusion of revenue and expenses or the sustainability of income tax credits for a given audit cycle. Given the global nature of our operations there is a risk that transfer pricing disputes may arise.
We have net operating loss carryforwards in Germany through November 30, 2009 that, as a result of reorganizations that took place in 2008 and 2009, were not recorded as deferred tax assets. Depending on the outcome of European court decisions these loss carryforwards may be available to reduce future taxable income in Germany.
General Motors Corporation was liquidated on December 15, 2011. The IRS has audited the returns through the liquidation date and, in January 2014, the audit of these returns was closed. The reduction to the amount of unrecognized tax benefits was not significant.
In January 2013 the U.S. Congress enacted federal income tax legislation including an extension of the research credit for tax years 2012 and 2013. As a result, in the year ended December 31, 2013 we recorded an income tax benefit related to the 2012 research credit of approximately $200 million.

Restructuring_And_Other_Initia

Restructuring And Other Initiatives	12 Months Ended
	Dec. 31, 2014
Restructuring and Related Activities [Abstract]
Restructuring and Other Initiatives [Text Block]	Restructuring and Other Initiatives
	We have executed various restructuring and other initiatives and we plan to execute additional initiatives in the future, if necessary, in order to align manufacturing capacity and other costs with prevailing global automotive production and to improve the utilization of remaining facilities. To the extent these programs involve voluntary separations, no liabilities are generally recorded until offers to employees are accepted. If employees are involuntarily terminated, a liability is generally recorded at the communication date. Related charges are recorded in Automotive cost of sales and Automotive selling, general and administrative expense.
	The following table summarizes the reserves related to restructuring and other initiatives and charges by segment, including postemployment benefit reserves and charges (dollars in millions):
		GMNA			GME			GMIO			GMSA			Total
	Balance at January 1, 2012	$	884		$	687		$	1		$	12		$	1,584
	Additions, interest accretion and other	140			254			84			92			570
	Payments	(304		)	(344		)	(46		)	(55		)	(749		)
	Revisions to estimates and effect of foreign currency	(67		)	(7		)	—			(11		)	(85		)
	Balance at December 31, 2012(a)	653			590			39			38			1,320
	Additions, interest accretion and other	58			202			404			50			714
	Payments	(182		)	(299		)	(111		)	(68		)	(660		)
	Revisions to estimates and effect of foreign currency	(32		)	10			1			(4		)	(25		)
	Balance at December 31, 2013(a)	497			503			333			16			1,349
	Additions, interest accretion and other	42			675			213			83			1,013
	Payments	(96		)	(329		)	(342		)	(95		)	(862		)
	Revisions to estimates and effect of foreign currency	16			(98		)	(38		)	(2		)	(122		)
	Balance at December 31, 2014(a)	$	459		$	751		$	166		$	2		$	1,378
	__________
	(a)	The remaining cash payments related to these reserves for restructuring and other initiatives, including temporary layoff benefits of $354 million, $353 million and $356 million at December 31, 2014, 2013 and 2012 for GMNA, primarily relate to postemployment benefits to be paid.
	Year Ended December 31, 2014
	Restructuring and other initiatives at GME primarily related to the termination of all vehicle and transmission production at our Bochum, Germany facility. Through December 31, 2014 the active separation programs related to Germany had a total cost of $841 million and had affected a total of 3,560 employees. We completed the separation program at Bochum in December 2014.
	Restructuring and other initiatives at GMIO primarily related to separation programs in Australia and Korea, the withdrawal of the Chevrolet brand from Europe and the cessation of manufacturing in Australia. Through December 31, 2014 the active separation programs related to Australia, Korea and Chevrolet Europe locations had a total cost of $514 million and affected a total of 3,380 employees. We expect to complete these programs in 2017 and incur additional restructuring and other charges of $270 million.
	Restructuring and other initiatives at GMSA primarily related to completed separation programs in Brazil and an active separation program in Venezuela and through December 31, 2014 had a total cost of $169 million.
	Year Ended December 31, 2013
	Restructuring and other initiatives primarily related to: (1) cash severance incentive programs for skilled trade U.S. hourly employees and service cost for hourly layoff benefits at GMNA; (2) our plan to terminate all vehicle and transmission production at our Bochum, Germany facility by the end of 2014 which had a total cost of $194 million and had affected a total of 450 employees at GME through December 31, 2013; (3) separation programs in Australia and Korea and programs related to the withdrawal of the Chevrolet brand from Europe, described below, which had a total cost of $420 million and had affected a total of 4,100 employees at GMIO through December 31, 2013; and (4) active separation programs in Brazil which had a total cost of $103 million at GMSA through December 31, 2013.
	Year Ended December 31, 2012
	Restructuring and other initiatives primarily related to: (1) our 2011 UAW labor agreement, which included cash severance incentive programs that were completed at March 31, 2012 at a total cost of $99 million affecting 1,400 skilled trade U.S. hourly employee participants and increased production capacity utilization in Canada at GMNA; (2) separation and early retirement programs in Germany and the United Kingdom that had a total cost of $400 million and affected a total of 2,550 employees, of which $310 million related to a program initiated in Germany in 2010 at GME; (3) voluntary separation programs in Korea and Australia which had a total cost of $69 million and affected 650 employees at GMIO; and (4) a separation program in Brazil of $87 million at GMSA.
	Withdrawal of the Chevrolet Brand from Europe
	In December 2013 we announced our plans to focus our marketing and product portfolio on our Opel and Vauxhall brands in Western and Central Europe and cease mainstream distribution of the Chevrolet brand in those markets in 2015. This decision impacts 1,200 Chevrolet dealers and distributors in the affected countries and 480 Chevrolet Europe employees. In the three months ended December 31, 2013 we recorded pre-tax charges of $636 million, net of noncontrolling interests of $124 million. These charges included dealer restructuring costs of $233 million and employee severance costs of $30 million which are reflected in the table above. The remaining charges for intangible asset impairments of $264 million and sales incentive, inventory related and other costs of $233 million are not included in the table above. Refer to Note 11 for additional information on the intangible asset impairment charges.
	Manufacturing Operations at Holden
	In December 2013 we announced plans to cease vehicle and engine manufacturing and significantly reduce engineering operations at Holden by the end of 2017. Holden will continue to sell imported vehicles through its Holden dealer network and maintain its global design studio. This decision affects 2,900 employees at certain Holden facilities. In the three months ended December 31, 2013 we recorded pre-tax charges of $536 million in Automotive cost of sales consisting primarily of asset impairment charges of $477 million, including property, plant and equipment, which are not included in the table above. The remaining charges relate to exit-related costs, including certain employee severance related costs, of which $59 million are included in the table above. Refer to Note 9 for additional information on the property, plant and equipment impairment charges.

Interest_Income_and_Other_NonO

Interest Income and Other Non-Operating Income, net	12 Months Ended
	Dec. 31, 2014
Interest and Other Income [Abstract]
Interest Income and Other Non-Operating Income, net [Text Block]	Interest Income and Other Non-Operating Income, net
	The following table summarizes the components of Interest income and other non-operating income, net (dollars in millions):
		Years Ended December 31,
		2014		2013			2012
	Interest income	$	211	$	246		$	343
	Net gains (losses) on derivatives	48		(13		)	(63		)
	Dividends and royalties	101		97			98
	Foreign currency transaction and remeasurement gains (losses)	378		(154		)	16
	Gains (losses) on securities and other investments - realized and unrealized	13		691			(193		)
	Deferred income from technology agreements	—		100			114
	Other	72		96			530
	Total interest income and other non-operating income, net	$	823	$	1,063		$	845
	In December 2013 we sold our investment in Ally Financial common stock through a private offering for net proceeds of $880 million and recorded a gain of $483 million.

Stockholders_Equity_and_Noncon

Stockholders' Equity and Noncontrolling Interests	12 Months Ended
	Dec. 31, 2014
Stockholders' Equity Note [Abstract]
Stockholders' Equity and Noncontrolling Interests [Text Block]	Stockholders’ Equity and Noncontrolling Interests
	Preferred and Common Stock
	We have 2.0 billion shares of preferred stock and 5.0 billion shares of common stock authorized for issuance. There were no shares of Series A Preferred Stock issued and outstanding at December 31, 2014 and 156 million shares of Series A Preferred Stock issued and outstanding at December 31, 2013. We had 1.6 billion and 1.5 billion shares of common stock issued and outstanding at December 31, 2014 and 2013.
	The following table summarizes significant features relating to our preferred and common stock (dollars in millions, except for per share amounts):
		Liquidation Preference Per Share			Dividend Per Annum			Dividends Paid
								Years Ended December 31,
								2014			2013		2012
	Series A Preferred Stock	$	25		9		%	$	1,160		$	1,370	$	621
	Series B Preferred Stock	$	50		4.75		%				$	237	$	238
	Common stock	N/A			$	1.2		$	1,928		$	—	$	—
	Series A Preferred Stock
	In December 2014 we redeemed all of the remaining outstanding shares of our Series A Preferred Stock at a price equal to the aggregate liquidation amount, including accumulated dividends, of $3.9 billion, which reduced Net income attributable to common stockholders by $809 million and is included within dividends paid in the table above.
	In September 2013 we purchased 120 million shares (or 43.5% of the total shares outstanding) of our Series A Preferred Stock held by the New VEBA at a price equal to 108.1% of the aggregate liquidation amount for $3.2 billion. We recorded a loss for the difference between the carrying amount of the Series A Preferred Stock purchased and the consideration paid, which reduced Net income attributable to common stockholders by $816 million and is included within dividends paid in the table above.
	Series B Preferred Stock
	On December 1, 2013 each of the 100 million shares of our Series B Preferred Stock outstanding automatically converted into 1.3736 shares of our common stock for a total of 137 million common shares. The number of shares of our common stock issued upon mandatory conversion of each share of Series B Preferred Stock was determined based on the average of the closing prices of our common stock over the 40 consecutive trading day period ended November 26, 2013.
	Common Stock
	Holders of our common stock are entitled to dividends at the sole discretion of our Board of Directors. No common stock dividends were declared or paid prior to 2014. Holders of common stock are entitled to one vote per share on all matters submitted to our stockholders for a vote. The liquidation rights of holders of our common stock are secondary to the payment or provision for payment of all our debts and liabilities and to holders of our preferred stock, if any such shares are then outstanding.
	In September 2014 we repurchased 5 million shares of our outstanding common stock at a weighted-average price of $33.69 per share, to offset the dilution from the June 2014 grant of stock incentive awards under the 2014 Long-term Incentive Plan.
	In December 2012 we purchased 200 million shares of our common stock from the U.S. Treasury at a price of $27.50 per share for a total of $5.5 billion. The purchase price represented a premium to the prior day's closing price of $25.49. We allocated the purchase price between a direct reduction to stockholders' equity of $5.1 billion and a charge to Automotive selling, general and administrative expense of $402 million representing the premium. These shares were retired and returned to authorized but unissued status. In the year ended December 31, 2012 we issued 1.3 million shares of common stock for the settlement of restricted stock and salary stock awards and 400,000 shares for exercised warrants. Refer to Note 23 for additional information on our stock incentive plans.
	Warrants
	In July 2009 we issued two tranches of warrants, each to acquire 136 million shares of common stock, to Motors Liquidation Company (MLC) which have all been distributed to creditors of General Motors Corporation and to the Motors Liquidation Company GUC Trust by MLC and one tranche of warrants to acquire 46 million shares of common stock to the New VEBA. The first tranche of MLC warrants is exercisable at any time prior to July 10, 2016 at an exercise price of $10.00 per share and the second tranche of MLC warrants is exercisable at any time prior to July 10, 2019 at an exercise price of $18.33 per share. The New VEBA warrants, which were subsequently sold by the New VEBA, are exercisable at any time prior to December 31, 2015 at an exercise price of $42.31 per share. Upon exercise of the warrants, the shares issued will be included in the number of basic shares outstanding used in the computation of earnings per share. The number of shares of common stock underlying each of the warrants and the per share exercise price are subject to adjustment as a result of certain events, including stock splits, reverse stock splits and stock dividends. The outstanding balance of warrants was 165 million and 293 million at December 31, 2014 and 2013.
	Accumulated Other Comprehensive Loss
	The following table summarizes the components of Accumulated other comprehensive loss (dollars in millions):
		Years Ended December 31,
		2014			2013			2012
	Foreign Currency Translation Adjustments
	Balance at beginning of period	$	(614	)	$	101		$	215
	Other comprehensive loss	(477		)	(722		)	(103		)
	Tax expense (benefit)	(4		)	11			—
	Other comprehensive loss, net of tax	(473		)	(733		)	(103		)
	Other comprehensive income (loss) attributable to noncontrolling interests, net of tax	23			18			(11		)
	Balance at end of period	$	(1,064	)	$	(614	)	$	101
	Unrealized Gains and Losses on Securities, Net
	Balance at beginning of period	$	2		$	41		$	(4	)
	Other comprehensive income (loss) before reclassification adjustment	(2		)	133			(140		)
	Tax expense (benefit)	(1		)	(6		)	22
	Other comprehensive income (loss) before reclassification adjustment, net of tax	(1		)	139			(162		)
	Reclassification adjustment	(7		)	(185		)	202
	Tax benefit	(3		)	(7		)	(5		)
	Reclassification adjustment, net of tax	(4		)	(178		)	207
	Other comprehensive income (loss), net of tax	(5		)	(39		)	45
	Balance at end of period	$	(3	)	$	2		$	41
	Defined Benefit Plans, Net
	Balance at beginning of period	$	(2,501	)	$	(8,194	)	$	(6,074	)
	Other comprehensive income (loss) before reclassification adjustment - prior service cost or credit	(20		)	6			(53		)
	Other comprehensive income (loss) before reclassification adjustment - actuarial gains or losses	(6,457		)	8,673			(3,180		)
	Tax expense (benefit)	(1,854		)	3,087			(1,021		)
	Other comprehensive income (loss) before reclassification adjustment, net of tax	(4,623		)	5,592			(2,212		)
	Reclassification adjustment - prior service cost or credit(a)	22			(128		)	(125		)
	Reclassification adjustment - actuarial gains or losses(a)	76			178			229
	Tax expense (benefit)(a)	(20		)	(51		)	12
	Reclassification adjustment, net of tax(a)	118			101			92
	Other comprehensive income (loss), net of tax	(4,505		)	5,693			(2,120		)
	Balance at end of period	$	(7,006	)	$	(2,501	)	$	(8,194	)
	__________
	(a)	Included in the computation of net periodic pension and OPEB (income) expense. Refer to Note 15 for additional information.

Earnings_Per_Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Earnings Per Share [Text Block]	Earnings Per Share
	Basic and diluted earnings per share are computed by dividing Net income attributable to common stockholders by the weighted-average common shares outstanding in the period. Diluted earnings per share is computed by giving effect to all potentially dilutive securities that are outstanding. The following table summarizes basic and diluted earnings per share (in millions, except for per share amounts):
		Years Ended December 31,
		2014			2013			2012
	Basic earnings per share
	Net income attributable to stockholders	$	3,949		$	5,346		$	6,188
	Less: cumulative dividends on preferred stock and charge related to redemption and purchase of preferred stock(a)	(1,145		)	(1,576		)	(859		)
	Less: undistributed earnings allocated to Series B Preferred Stock participating security				—			(470		)
	Net income attributable to common stockholders	$	2,804		$	3,770		$	4,859
	Weighted-average common shares outstanding - basic	1,605			1,393			1,566
	Basic earnings per common share	$	1.75		$	2.71		$	3.1
	Diluted earnings per share
	Net income attributable to stockholders	$	3,949		$	5,346		$	6,188
	Add: preferred dividends to holders of Series B Preferred Stock				218			—
	Less: cumulative dividends on preferred stock and charge related to redemption and purchase of preferred stock(a)	(1,145		)	(1,576		)	(859		)
	Less: undistributed earnings allocated to Series B Preferred Stock participating security				—			(442		)
	Less: earnings adjustment for dilutive stock compensation	(18		)
	Net income attributable to common stockholders	$	2,786		$	3,988		$	4,887
	Weighted-average common shares outstanding - diluted
	Weighted-average common shares outstanding - basic	1,605			1,393			1,566
	Dilutive effect of warrants and RSUs	82			149			109
	Dilutive effect of conversion of Series B Preferred Stock				134			—
	Weighted-average common shares outstanding - diluted	1,687			1,676			1,675
	Diluted earnings per common share	$	1.65		$	2.38		$	2.92
	__________
	(a)	Includes earned but undeclared dividends of $15 million and $26 million on our Series A Preferred Stock in the years ended December 31, 2013 and 2012 and $20 million on our Series B Preferred Stock in the year ended December 31, 2012.
	Prior to the December 2013 conversion to common shares, holders of the Series B Preferred Stock had a right to participate in our undistributed earnings because a dividend, if declared, would result in a transfer of value to the holder through an adjustment to the fixed conversion ratios according to various anti-dilution provisions. Based on the nature of the Series B Preferred Stock and the nature of these anti-dilution provisions, we concluded that the Series B Preferred Stock was a participating security and, as such, requires the application of the more dilutive of the two-class or if-converted method to calculate earnings per share when the applicable market value of our common stock is below or above the range of $33.00 to $39.60 per common share. The calculation of the applicable market value is applied to the full year, irrespective of the applicable market value computed during the prior quarters of the current year. On the mandatory conversion date of our Series B Preferred Stock, December 1, 2013, the applicable market value of our common stock was within the range of $33.00 to $39.60 per common share and, as such, we applied the if-converted method for purposes of calculating diluted earnings per share in the year ended December 31, 2013. The impact on diluted earnings per share was an increase of $0.13 in the year ended December 31, 2013 using the if-converted as compared to the two-class method.
	In the year ended December 31, 2012 we were required to use the two-class method for calculating earnings per share as the applicable market value of our common stock was below $33.00 per common share. Under the two-class method for computing earnings per share, undistributed earnings are allocated to common stock and the Series B Preferred Stock according to their respective participation rights in undistributed earnings, as if all the earnings for the period had been distributed. This allocation to the Series B Preferred Stock holders reduced Net income attributable to common stockholders, resulting in a lower basic and diluted earnings per share amount. The application of the two-class method resulted in an allocation of undistributed earnings to our Series B Preferred Stock holders and, accordingly, 152 million common stock equivalents from the assumed conversion of the Series B Preferred Stock are not considered outstanding for purposes of determining the weighted-average common shares outstanding in the computation of diluted earnings per share for December 31, 2012.
	In the years ended December 31, 2014, 2013 and 2012 warrants to purchase 46 million shares were not included in the computation of diluted earnings per share because the warrants' exercise price was greater than the average market price of the common shares.

Stock_Incentive_Plans

Stock Incentive Plans	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Incentive Plans [Text Block]	Stock Incentive Plans
	Stock incentive plan awards outstanding at December 31, 2014 consist of awards granted under the 2014 Long-Term Incentive Plan, the 2009 Long-Term Incentive Plan and the Salary Stock Plan. The 2014 Long-Term Incentive Plan was approved by stockholders in June 2014 and replaced the 2009 Long-Term Incentive Plan and Salary Stock Plan. These plans are administered by the Executive Compensation Committee of our Board of Directors. The aggregate number of shares with respect to which awards may be granted under the 2014 Long-Term Incentive Plan shall not exceed 60 million. In January 2014 we amended the 2009 Long-Term Incentive Plan and the Salary Stock Plan to provide cash payment, on a going forward basis, of dividend equivalents upon settlement to active employees and certain former employees with outstanding awards as of the amendment date.
	Long-Term Incentive Plan
	We grant RSUs and PSUs under our 2014 Long-Term Incentive Plan and, prior to our 2014 Long-Term Incentive Plan, RSUs under our 2009 Long-Term Incentive Plan. Shares awarded under the plans are subject to forfeiture if the participant leaves the company for reasons other than those permitted under the plans such as retirement, death or disability. Our policy is to issue new shares upon settlement of RSUs and PSUs.
	We granted 8 million, 7 million and 7 million RSUs in the years ended December 31, 2014, 2013 and 2012. These awards either cliff vest or ratably vest generally over a three-year service period, as defined in the terms of each award. Vesting and subsequent settlement will generally occur based upon employment at the end of each specified service period.
	We issued 4 million PSUs, equal to the targeted number of shares, in the year ended December 31, 2014. The ultimate number of shares earned will be determined at the end of the specified performance period, which is three years, based on performance criteria determined by the Executive Compensation Committee of the Board of Directors at the time of award. The number of shares earned may equal, exceed or be less than the targeted number of shares depending on whether the performance criteria are met, surpassed or not met. PSU awards generally vest and settle at the end of a three-year period.
	Salary Stock Plan
	In the years ended December 31, 2013 and 2012 a portion of each participant's salary was accrued on each salary payment date and converted to RSUs on a quarterly basis. In June 2013 we amended the plan to provide for cash or share settlement of awards based on election by the participant. The liability for these awards continues to be remeasured to fair value at the end of each reporting period.
	RSUs and PSUs
	The following table summarizes information about the RSUs and PSUs under our stock incentive plans (units in millions):
		Shares		Weighted-Average Grant Date Fair Value			Weighted-Average Remaining Contractual Term in Years
	Units outstanding at January 1, 2014	18.6		$	27.76		1.2
	Granted	12.1		$	35.31
	Settled	(9.3	)	$	27.85
	Forfeited or expired	(1.5	)	$	30.39
	Units outstanding at December 31, 2014	19.9		$	32.11		1.3
	Units unvested and expected to vest at December 31, 2014	12.7		$	32.91		1.5
	Units vested and payable at December 31, 2014	6.7		$	30.49
	Units granted in the year ended December 31, 2013			$	29.05
	Units granted in the year ended December 31, 2012			$	25.1
	The following table summarizes compensation expense recorded for our stock incentive plans (dollars in millions):
		Years Ended December 31,
		2014			2013			2012
	Compensation expense	$	245		$	311		$	302
	Income tax benefit	$	81		$	100		$	100
	At December 31, 2014 the total unrecognized compensation expense for nonvested equity awards granted was $247 million. This expense is expected to be recorded over a weighted-average period of 1.5 years. The total fair value of RSUs and PSUs vested in the years ended December 31, 2014, 2013 and 2012 was $221 million, $342 million and $141 million. In the years ended December 31, 2014, 2013 and 2012 total payments for 2.4 million, 3.1 million and 1.6 million RSUs settled under stock incentive plans were $85 million, $94 million and $36 million.

Supplementary_Quarterly_Financ

Supplementary Quarterly Financial Information (Unaudited)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Supplementary Quarterly Financial Information (Unaudited) [Text Block]	Supplementary Quarterly Financial Information (Unaudited)
	The following tables summarize supplementary quarterly financial information (dollars in millions, except per share amounts):
		1st Quarter		2nd Quarter		3rd Quarter		4th Quarter
	2014
	Total net sales and revenue	$	37,408	$	39,649	$	39,255	$	39,617
	Automotive gross margin	$	2,188	$	2,611	$	3,945	$	4,266
	Net income	$	280	$	287	$	1,442	$	2,009
	Net income attributable to stockholders	$	213	$	278	$	1,471	$	1,987
	Earnings per share, basic	$	0.08	$	0.12	$	0.86	$	0.69
	Earnings per share, diluted	$	0.06	$	0.11	$	0.81	$	0.66
		1st Quarter		2nd Quarter		3rd Quarter		4th Quarter
	2013
	Total net sales and revenue	$	36,884	$	39,075	$	38,983	$	40,485
	Automotive gross margin	$	3,727	$	4,416	$	4,954	$	4,070
	Net income	$	1,185	$	1,388	$	1,705	$	1,053
	Net income attributable to stockholders	$	1,175	$	1,414	$	1,717	$	1,040
	Earnings per share, basic	$	0.63	$	0.87	$	0.5	$	0.64
	Earnings per share, diluted	$	0.58	$	0.75	$	0.45	$	0.57
	The three months ended December 31, 2014 included the following on a pre-tax basis:
	•	Gain on extinguishment of debt of $207 million related to unsecured debt in Brazil in GMSA.
	•	Asset impairment charges of $158 million related to our Thailand subsidiary in GMIO.
	The three months ended September 30, 2014 included asset impairment charges of $194 million related to Russian subsidiaries in GME on a pre-tax basis.
	The three months ended June 30, 2014 included the following on a pre-tax basis:
	•	Recall campaign and courtesy transportation charges of $1.1 billion in GMNA.
	•	Catch-up adjustment of $874 million related to change in estimate of recall campaigns in GMNA.
	•	Charge of $400 million for ignition switch recall compensation program in Corporate.
	The three months ended March 31, 2014 included the following on a pre-tax basis:
	•	Recall campaign and courtesy transportation charges of $1.3 billion in GMNA.
	•	Charge of $419 million for the Venezuela currency devaluation in GMSA.
	The three months ended December 31, 2013 included the following on a pre-tax (except tax matters) and pre-noncontrolling interests basis:
	•	Benefit from the release of GM Korea wage litigation accruals of $846 million in GMIO.
	•	Asset impairment charges of $805 million at Holden and GM India in GMIO.
	•	Charges of $745 million related to our plans to cease mainstream distribution of Chevrolet brand in Europe in GMIO.
	•	Gain on sale of equity investment in Ally Financial of $483 million in Corporate.
	•	Goodwill impairment charges of $481 million in GMIO.
	•	Tax benefit of $473 million from remeasurement of uncertain tax position in Corporate.
	•	Gain on sale of equity investment in PSA of $152 million in GME.
	The three months ended June 30, 2013 included loss on extinguishment of debt of $240 million related to early redemption of preferred shares at GM Korea in GMIO on a pre-tax and pre-noncontrolling interests basis.
	The three months ended March 31, 2013 included a charge of $162 million in GMSA for the Venezuela currency devaluation on a pre-tax basis. In the three months ended March 31, 2013 we used the two-class method for calculating earnings per share because Series B Preferred Stock was a participating security.

Segment_Reporting

Segment Reporting	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Segment Reporting [Text Block]	Segment Reporting
	We analyze the results of our business through the following segments: GMNA, GME, GMIO, GMSA and GM Financial. The chief operating decision maker evaluates the operating results and performance of our automotive segments through income before interest and income taxes, as adjusted for additional amounts, which is presented net of noncontrolling interests. The chief operating decision maker evaluates GM Financial through income before income taxes-adjusted because he/she believes interest income and interest expense are part of operating results when assessing and measuring the operational and financial performance of the segment. Each segment has a manager responsible for executing our strategies. Our automotive manufacturing operations are integrated within the segments, benefit from broad-based trade agreements and are subject to regulatory requirements, such as CAFE regulations. While not all vehicles within a segment are individually profitable on a fully allocated cost basis, those vehicles are needed in our product mix in order to attract customers to dealer showrooms and to maintain sales volumes for other, more profitable vehicles. Because of these and other factors, we do not manage our business on an individual brand or vehicle basis.
	Substantially all of the cars, trucks and parts produced are marketed through retail dealers in North America, and through distributors and dealers outside of North America, the substantial majority of which are independently owned.
	In addition to the products sold to dealers for consumer retail sales, cars and trucks are also sold to fleet customers, including daily rental car companies, commercial fleet customers, leasing companies and governments. Sales to fleet customers are completed through the network of dealers and in some cases sold directly to fleet customers. Retail and fleet customers can obtain a wide range of aftersale vehicle services and products through the dealer network, such as maintenance, light repairs, collision repairs, vehicle accessories and extended service warranties.
	GMNA primarily meets the demands of customers in North America with vehicles developed, manufactured and/or marketed under the Buick, Cadillac, Chevrolet and GMC brands. The demands of customers outside North America are primarily met with vehicles developed, manufactured and/or marketed under the Buick, Cadillac, Chevrolet, GMC, Holden, Opel and Vauxhall brands. We also had equity ownership stakes directly or indirectly in entities through various regional subsidiaries, primarily in Asia. These companies design, manufacture and market vehicles under the Alpheon, Baojun, Buick, Cadillac, Chevrolet, Jiefang and Wuling brands.
	Our automotive operations' interest income and interest expense are recorded centrally in Corporate. Corporate assets consist primarily of cash and cash equivalents, marketable securities and intercompany balances. All intersegment balances and transactions have been eliminated in consolidation.
	The following tables summarize key financial information by segment (dollars in millions):
		At and For the Year Ended December 31, 2014
		GMNA			GME			GMIO			GMSA			Corporate			Eliminations			Total Automotive			GM Financial			Eliminations			Total
	Sales
	External customers	$	101,199		$	22,235		$	14,392		$	13,115		$	151					$	151,092		$	—		$	—		$	151,092
	GM Financial revenue	—			—			—			—			—						—			4,854			(17		)	4,837
	Total net sales and revenue	$	101,199		$	22,235		$	14,392		$	13,115		$	151					$	151,092		$	4,854		$	(17	)	$	155,929
	Income (loss) before interest and taxes-adjusted	$	6,603		$	(1,369	)	$	1,222		$	(180	)	$	(580	)				$	5,696		$	803		$	(5	)	$	6,494
	Adjustments(a)	$	(975	)	$	(245	)	$	(180	)	$	(539	)	$	(400	)				$	(2,339	)	$	12		$	—		(2,327		)
	Automotive interest income																												211
	Automotive interest expense																												(403		)
	Gain on extinguishment of debt																												202
	Net income attributable to noncontrolling interests																												69
	Income before income taxes																												$	4,246
	Equity in net assets of nonconsolidated affiliates	$	88		$	6		$	8,254		$	2		$	—		$	—		$	8,350		$	—		$	—		$	8,350
	Total assets	$	92,864		$	10,528		$	22,949		$	10,066		$	24,368		$	(29,041	)	$	131,734		$	47,861		$	(1,918	)	$	177,677
	Expenditures for property	$	4,985		$	887		$	681		$	359		$	127		$	—		$	7,039		$	52		$	—		$	7,091
	Depreciation, amortization and impairment of long-lived assets and finite-lived intangible assets	$	4,376		$	627		$	740		$	386		$	75		$	(4	)	$	6,200		$	918		$	—		$	7,118
	Equity income (loss)	$	19		$	(45	)	$	2,120		$	—		$	—		$	—		$	2,094		$	—		$	—		$	2,094
	__________
	(a)	Consists of a catch-up adjustment related to the change in estimate for recall campaigns of $874 million and charges related to flood damage, net of insurance recoveries, of $101 million in GMNA; asset impairment charges of $245 million related to our Russian subsidiaries in GME; asset impairment charges of $158 million related to our Thailand subsidiary in GMIO; Venezuela currency devaluation charges of $419 million and Goodwill impairment charges of $120 million in GMSA; a charge related to the ignition switch recall compensation program of $400 million in Corporate; and other of $10 million.
		At and For the Year Ended December 31, 2013
		GMNA			GME			GMIO			GMSA			Corporate			Eliminations			Total Automotive			GM Financial			Eliminations			Total
	Sales
	External customers	$	95,091		$	21,962		$	18,411		$	16,478		$	150					$	152,092		$	—		$	—		$	152,092
	GM Financial revenue	—			—			—			—			—						—			3,344			(9		)	3,335
	Intersegment	8			—			—			—			—						8			—			(8		)	—
	Total net sales and revenue	$	95,099		$	21,962		$	18,411		$	16,478		$	150					$	152,100		$	3,344		$	(17	)	$	155,427
	Income (loss) before interest and taxes-adjusted	$	7,461		$	(869	)	$	1,255		$	327		$	(494	)				$	7,680		$	898		$	—		$	8,578
	Adjustments(a)	$	(100	)	$	153		$	(1,169	)	$	(157	)	$	483					$	(790	)	$	(15	)	$	—		(805		)
	Automotive interest income																												246
	Automotive interest expense																												(334		)
	Loss on extinguishment of debt																												(212		)
	Net loss attributable to noncontrolling interests																												(15		)
	Income before income taxes																												$	7,458
	Equity in net assets of nonconsolidated affiliates	$	74		$	95		$	7,921		$	4		$	—		$	—		$	8,094		$	—		$	—		$	8,094
	Total assets	$	87,978		$	11,276		$	22,100		$	11,488		$	26,460		$	(29,252	)	$	130,050		$	38,084		$	(1,790	)	$	166,344
	Expenditures for property	$	5,466		$	818		$	724		$	444		$	92		$	5		$	7,549		$	16		$	—		$	7,565
	Depreciation, amortization and impairment of long-lived assets and finite-lived intangible assets	$	4,216		$	426		$	1,786		$	522		$	63		$	(1	)	$	7,012		$	498		$	(10	)	$	7,500
	Equity income	$	15		$	34		$	1,760		$	1		$	—		$	—		$	1,810		$	—		$	—		$	1,810
	__________
	(a)	Consists of pension settlement charges of $56 million and charges related to PSA product development agreement of $49 million in GMNA; gain on sale of equity investment in PSA of $152 million in GME; property and intangible asset impairment charges of $774 million, costs related to the withdrawal of the Chevrolet brand in Europe of $621 million and goodwill impairment charges of $442 million, partially offset by GM Korea hourly wage litigation of $577 million and acquisition of GM Korea preferred shares of $67 million in GMIO, all net of noncontrolling interests; Venezuela currency devaluation charges of $162 million in GMSA; gain on sale of equity investment in Ally Financial of $483 million in Corporate; costs related to the withdrawal of the Chevrolet brand in Europe of $15 million in GM Financial; and income related to various insurance recoveries of $35 million.
		At and For the Year Ended December 31, 2012
		GMNA			GME			GMIO			GMSA			Corporate			Eliminations			Total Automotive			GM Financial			Eliminations			Total
	Sales
	External customers	$	89,912		$	23,055		$	20,588		$	16,700		$	40					$	150,295		$	—		$	—		$	150,295
	GM Financial revenue	—			—			—			—			—						—			1,961			—			1,961
	Intersegment	(2		)	—			—			—			—						(2		)	—			2			—
	Total net sales and revenue	$	89,910		$	23,055		$	20,588		$	16,700		$	40					$	150,293		$	1,961		$	2		$	152,256
	Income (loss) before interest and taxes-adjusted	$	6,470		$	(1,949	)	$	2,538		$	457		$	(400	)				$	7,116		$	744		$	(1	)	$	7,859
	Adjustments(a)	$	(29,052	)	$	(6,389	)	$	(290	)	$	27		$	(402	)				$	(36,106	)	$	—		$	—		(36,106		)
	Automotive interest income																												343
	Automotive interest expense																												(489		)
	Loss on extinguishment of debt																												(250		)
	Net loss attributable to noncontrolling interests																												(52		)
	Loss before income taxes																												$	(28,695	)
	Equity in net assets of nonconsolidated affiliates	$	65		$	159		$	6,656		$	3		$	—		$	—		$	6,883		$	—		$	—		$	6,883
	Total assets	$	87,100		$	10,475		$	24,147		$	11,958		$	16,991		$	(16,927	)	$	133,744		$	16,368		$	(690	)	$	149,422
Expenditures for property	$	4,766		$	1,075		$	1,185		$	956		$	77		$	(4	)	$	8,055		$	13		$	—		$	8,068
Depreciation, amortization and impairment of long-lived assets and finite-lived intangible assets	$	3,663		$	6,584		$	624		$	483		$	49		$	(1	)	$	11,402		$	225		$	(10	)	$	11,617
Equity income	$	9		$	35		$	1,517		$	1		$	—		$	—		$	1,562		$	—		$	—		$	1,562
Valuation allowances against deferred tax assets(b)	$	—		$	—		$	—		$	—		$	(36,261	)	$	—		$	(36,261	)	$	(103	)	$	—		$	(36,364	)
__________
(a)	Consists primarily of Goodwill impairment charges of $26.4 billion, pension settlement charges of $2.7 billion and income related to various insurance recoveries of $9 million in GMNA; property impairment charges of $3.7 billion, intangible assets impairment charges of $1.8 billion, goodwill impairment charges of $590 million, impairment charges related to investment in PSA of $220 million, a charge of $119 million to record General Motors Strasbourg S.A.S. assets and liabilities to estimated fair value and income related to various insurance recoveries of $9 million in GME; GM Korea hourly wage litigation charge of $336 million, goodwill impairment charges of $132 million, which are presented net of noncontrolling interests, income related to various insurance recoveries of $110 million and income related to redemption of the GM Korea mandatorily redeemable preferred shares of $68 million in GMIO; income related to various insurance recoveries of $27 million in GMSA; and a charge of $402 million which represents the premium paid to purchase our common stock from the UST in Corporate.
(b)	Includes valuation allowance releases of $36.5 billion net of the establishment of new valuation allowances of $0.1 billion. Amounts exclude changes related to income tax expense (benefits) in jurisdictions with a full valuation allowance throughout the period.
Automotive revenue is attributed to geographic areas based on the country in which our subsidiary is located. Automotive Financing revenue is attributed to the geographic area where the financing is originated. The following table summarizes information concerning principal geographic areas (dollars in millions):
	At and For the Years Ended December 31,
	2014						2013						2012
	Net Sales & Revenue			Long-Lived Assets			Net Sales & Revenue			Long-Lived Assets			Net Sales & Revenue			Long-Lived Assets
Automotive
U.S.	$	93,559		$	18,813		$	88,784		$	15,844		$	85,105		$	13,520
Non-U.S.	57,533			12,355			63,308			12,289			65,190			12,425
GM Financial
U.S.	2,549			5,477			2,233			2,472			1,832			1,112
Non-U.S.	2,288			1,755			1,102			1,043			129			590
Total consolidated	$	155,929		$	38,400		$	155,427		$	31,648		$	152,256		$	27,647
No individual country other than the U.S. represented more than 10% of our total Net sales and revenue or Long-lived assets.

Supplemental_Information_for_t

Supplemental Information for the Consolidated Statements of Cash Flows	12 Months Ended
	Dec. 31, 2014
Supplemental Cash Flow Information [Abstract]
Supplemental Information for the Consolidated Statements of Cash Flows [Text Block]	Supplemental Information for the Consolidated Statements of Cash Flows
	The following table summarizes the sources (uses) of cash provided by Change in other operating assets and liabilities and cash paid for income taxes and interest (dollars in millions):
		Years Ended December 31,
		2014			2013			2012
	Accounts receivable	$	(1,248	)	$	8		$	(460	)
	Purchases of wholesale receivables, net	(2,000		)	—			—
	Inventories	(309		)	59			(326		)
	Automotive equipment on operating leases	(1,949		)	(968		)	370
	Change in other assets	(213		)	(563		)	(312		)
	Accounts payable	19			(485		)	162
	Income taxes payable	(145		)	(161		)	155
	Accrued liabilities and other liabilities	6,089			784			1,041
	Total	$	244		$	(1,326	)	$	630
	Cash paid for income taxes and interest
	Cash paid for income taxes	$	947		$	727		$	575
	Cash paid for interest (net of amounts capitalized) - Automotive	$	301		$	299		$	335
	Cash paid for interest (net of amounts capitalized) - GM Financial	1,120			760			298
	Total cash paid for interest (net of amounts capitalized)	$	1,421		$	1,059		$	633

Nature_Of_Operations_and_Basis1

Nature Of Operations and Basis of Presentation (Policies)	12 Months Ended
	Dec. 31, 2014
Nature of Operations and Basis of Presentation [Abstract]
Consolidation, Policy [Policy Text Block]	Principles of Consolidation
	The consolidated financial statements are prepared in conformity with U.S. GAAP. All intercompany balances and transactions have been eliminated in consolidation. Certain prior year amounts were reclassified to conform to our current year presentation. In the three months ended March 31, 2014 we changed our managerial and financial reporting structure to reclassify the results of our Russian subsidiaries previously reported in our GMIO segment to our GME segment. We have retrospectively revised the segment presentation for all periods presented. Refer to Note 25 for additional information on our segment reporting.
	We consolidate entities that we control due to ownership of a majority voting interest and we consolidate variable interest entities (VIEs) when we have variable interests and are the primary beneficiary. We continually evaluate our involvement with VIEs to determine when these criteria are met. Our share of earnings or losses of nonconsolidated affiliates is included in our consolidated operating results using the equity method of accounting when we are able to exercise significant influence over the operating and financial decisions of the affiliate. We use the cost method of accounting if we are not able to exercise significant influence over the operating and financial decisions of the affiliate.
Use of Estimates, Policy [Policy Text Block]	Use of Estimates in the Preparation of the Financial Statements
	Accounting estimates are an integral part of the consolidated financial statements. These estimates require the use of judgments and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses in the periods presented. We believe that the accounting estimates employed are appropriate and the resulting balances are reasonable; however, due to the inherent uncertainties in making estimates actual results could differ from the original estimates, requiring adjustments to these balances in future periods.
	Change in Accounting Estimate
	We historically accrued estimated costs related to recall campaigns in GMNA when they are probable and reasonably estimable, which typically occurs once it is determined a specific recall campaign is needed and announced. During the three months ended June 30, 2014, following the significant increase in the number of vehicles subject to recall in GMNA, the results of our ongoing comprehensive safety review, additional engineering analysis, the creation of a new Global Product Integrity organization, the appointment of a new Global Vice President of Vehicle Safety responsible for the safety development of our vehicle systems and our overall commitment to customer satisfaction, we accumulated sufficient historical data in GMNA to support the use of an actuarial-based estimation technique for recall campaigns. As such we now accrue at the time of vehicle sale in GMNA the costs for recall campaigns. Based on expanded historical data, we recorded a catch-up adjustment of $874 million in Automotive cost of sales in the three months ended June 30, 2014 to adjust the estimate for recall costs for previously sold vehicles. In other geographical regions the historical claims data did not support the application of an actuarial-based model; therefore, recall campaigns are accrued when probable and reasonably estimable, which typically occurs once it is determined a specific recall campaign is needed and announced.

Significant_Accounting_Policie1

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Revenue Recognition, Policy [Policy Text Block]	Revenue Recognition
	Automotive
	Automotive net sales and revenue are primarily composed of revenue generated from the sale of vehicles. Vehicle sales are recorded when title and all risks and rewards of ownership have passed to our customers. For the majority of our automotive sales this occurs when a vehicle is released to the carrier responsible for transporting to a dealer and when collectability is reasonably assured. Vehicle sales are recorded when the vehicle is delivered to the dealer in most remaining cases. Provisions for recurring or announced dealer and customer sales and leasing incentives, consisting of allowances and rebates, are recorded as reductions to Automotive net sales and revenue at the time of vehicle sales. All other incentives, allowances and rebates related to vehicles previously sold are recorded as reductions to Automotive net sales and revenue when announced.
	Vehicle sales to daily rental car companies with guaranteed repurchase obligations are accounted for as operating leases. Estimated lease revenue is recorded ratably over the estimated term of the lease based on the difference between net sales proceeds and the guaranteed repurchase amount. The difference between the cost of the vehicle and estimated residual value is depreciated on a straight-line basis over the estimated term of the lease.
	Automotive Financing - GM Financial
	Finance charge income earned on receivables is recognized using the effective interest method for consumer financing receivables and accrual method for commercial financing receivables. Fees and commissions (including incentive payments) received and direct costs of originating loans are deferred and amortized over the term of the related finance receivables using the effective interest method and are removed from the consolidated balance sheets when the related finance receivables are sold, charged off or paid in full. Accrual of finance charge income on consumer finance receivables is generally suspended on accounts that are more than 60 days delinquent, accounts in bankruptcy and accounts in repossession. Payments received on nonaccrual loans are first applied to any fees due, then to any interest due and then any remaining amounts are recorded to principal. Interest accrual generally resumes once an account has received payments bringing the delinquency to less than 60 days past due. Accrual of finance charge income on commercial finance receivables is generally suspended on accounts that are more than 90 days delinquent, upon receipt of a bankruptcy notice from a borrower, or where reasonable doubt about the full collectability of contractually agreed upon principal and interest exist. Payments received on nonaccrual loans are first applied to principal. Interest accrual resumes once an account has received payments bringing the account fully current and collection of contractual principal and interest is reasonably assured (including amounts previously charged-off) or, for troubled debt restructurings (TDRs), when repayment is reasonably assured based on the modified terms of the loan.
	Income from operating lease assets, which includes lease origination fees, net of lease origination costs and incentives, is recorded as operating lease revenue on a straight-line basis over the term of the lease agreement.
Advertising and Promotion, Policy [Policy Text Block]	Advertising and Promotion Expenditures
	Advertising and promotion expenditures, which are expensed as incurred in Automotive selling, general and administrative expense, were $5.2 billion, $5.5 billion and $5.4 billion in the years ended December 31, 2014, 2013 and 2012.
Research and Development Expenditures, Policy [Policy Text Block]	Research and Development Expenditures
	Research and development expenditures, which are expensed as incurred in Automotive cost of sales, were $7.4 billion, $7.2 billion and $7.4 billion in the years ended December, 31 2014, 2013 and 2012.
Cash Equivalents, Policy [Policy Text Block]	Cash Equivalents
	Cash equivalents are defined as short-term, highly-liquid investments with original maturities of 90 days or less.
Allowance for Doubtful Accounts [Policy Text Block]	Allowance for Doubtful Accounts
	We record an allowance for doubtful accounts based on our best estimate of recoverability of receivables. Charges related to the allowance for doubtful accounts are recorded in Automotive selling, general and administrative expense. The following table summarizes activity in our allowance for doubtful accounts and notes receivable related to our automotive operations (dollars in millions):
		Years Ended December 31,
		2014			2013			2012
	Balance at beginning of period	$	344		$	311		$	331
	Amounts charged (credited) to costs and expenses	50			61			(10		)
	Deductions	(8		)	(24		)	(46		)
	Effect of foreign currency and other	(46		)	(4		)	36
	Balance at end of period	$	340		$	344		$	311
Fair Value Measurements, Policy [Policy Text Block]	Fair Value Measurements
	A three-level valuation hierarchy, based upon observable and unobservable inputs, is used for fair value measurements. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect market assumptions based on the best evidence available. These two types of inputs create the following fair value hierarchy:
	•	Level 1 - Quoted prices for identical instruments in active markets;
	•	Level 2 - Quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active and model-derived valuations whose significant inputs are observable; and
	•	Level 3 - Instruments whose significant inputs are unobservable.
	Financial instruments are transferred in and/or out of Level 1, 2 or 3 at the beginning of the accounting period in which there is a change in the valuation inputs.
Marketable Securities, Policy [Policy Text Block]	Marketable Securities
	We classify marketable securities as available-for-sale or trading. Various factors, including turnover of holdings and investment guidelines, are considered in determining the classification of securities. Available-for-sale securities are recorded at fair value with unrealized gains and losses recorded net of related income taxes in Accumulated other comprehensive loss until realized. Trading securities are recorded at fair value with changes in fair value recorded in Interest income and other non-operating income, net. We determine realized gains and losses for all securities using the specific identification method.
	We measure the fair value of our marketable securities using a market approach where identical or comparable prices are available and an income approach in other cases. If quoted market prices are not available, fair values of securities are determined using prices from a pricing service, pricing models, quoted prices of securities with similar characteristics or discounted cash flow models. These prices represent non-binding quotes. Our pricing service utilizes industry-standard pricing models that consider various inputs. We conduct an annual review of our pricing service. Based on our review we believe the prices received from our pricing service are a reliable representation of exit prices.
	An evaluation is made quarterly to determine if unrealized losses related to non-trading investments in securities are other-than-temporary. Factors considered in determining whether a loss on a marketable security is other-than-temporary include: (1) the length of time and extent to which the fair value has been below cost; (2) the financial condition and near-term prospects of the issuer; and (3) the intent to sell or likelihood to be forced to sell the security before any anticipated recovery.
Finance Receivable, Policy [Policy Text Block]	Finance Receivables
	As the result of our October 2010 acquisition of GM Financial and GM Financial's acquisition of the Ally Financial international operations, finance receivables are reported in two portfolios: pre-acquisition and post-acquisition portfolios. The pre-acquisition finance receivables portfolio consists of finance receivables that were considered to have had deterioration in credit quality at the time they were acquired with the acquisitions of GM Financial or the Ally Financial international operations. The pre-acquisition portfolio will decrease over time with the amortization of the acquired receivables. The post-acquisition finance receivables portfolio consists of finance receivables that were considered to have had no deterioration in credit quality at the time they were acquired with the acquisition of the Ally Financial international operations and finance receivables originated since the acquisitions of GM Financial and the Ally Financial international operations. The post-acquisition portfolio is expected to grow over time as GM Financial originates new receivables.
	Pre-Acquisition Consumer Finance Receivables
	At the time of acquisitions the receivables were recorded at fair value. The pre-acquisition finance receivables were acquired at a discount, which contains two components: a non-accretable difference and an accretable yield. The accretable yield is recorded as finance charge income over the life of the acquired receivables.
	Any deterioration in the performance of the pre-acquisition finance receivables from their expected performance will result in an incremental provision for loan losses. Improvements in the performance of the pre-acquisition finance receivables will result first in the reversal of any incremental related allowance for loan losses and then in a transfer of the excess from the non-accretable difference to accretable yield, which will be recorded as finance charge income over the remaining life of the receivables.
	Post-Acquisition Consumer Finance Receivables and Allowance for Loan Losses
	Post-acquisition finance receivables originated since the acquisitions of GM Financial and the Ally Financial international operations are carried at amortized cost, net of allowance for loan losses.
	The component of the allowance for consumer finance receivables that is collectively evaluated for impairment is based on a statistical calculation supplemented by management judgment. GM Financial uses a combination of forecasting models to determine the allowance for loan losses. Factors that are considered when estimating the allowance include loss confirmation period, historical delinquency migration to loss, probability of default and loss given default. The loss confirmation period is a key assumption within the models, which represents the average amount of time from when a loss event first occurs to when the receivable is charged-off.
	Consumer finance receivables that become classified as TDRs are separately assessed for impairment. A specific allowance is estimated based on the present value of the expected future cash flows of the receivable discounted at the loan's original effective interest rate.
	Consumer finance receivables are generally charged off in the month in which the account becomes 120 days contractually delinquent if we have not yet recorded a repossession charge-off. A charge-off generally represents the difference between the estimated net sales proceeds and the amount of the contract, including accrued interest.
	The finance receivables acquired with the Ally Financial international operations that were considered to have no deterioration in credit quality at the time of acquisition were recorded at fair value. The purchase discount will accrete to income over the life of the receivables, based on contractual cash flows, using the effective interest method. Provisions for loan losses are charged to operations in amounts equal to net credit losses for the period. Any subsequent deterioration in the performance of the acquired receivables will result in an incremental provision for loan losses.
Inventory, Policy [Policy Text Block]	Inventory
	Inventories are stated at the lower of cost or market. Market, which represents selling price less cost to sell, considers general market and economic conditions, periodic reviews of current profitability of vehicles, product warranty costs and the effect of current and expected incentive offers at the balance sheet date. Market for off-lease and other vehicles is current auction sales proceeds less disposal and warranty costs. Productive material, work in process, supplies and service parts are reviewed to determine if inventory quantities are in excess of forecasted usage or if they have become obsolete.
Equipment on Operating Leases, net, Policy [Policy Text Block]	Equipment on Operating Leases, net
	Equipment on operating leases, net is reported at cost, less accumulated depreciation and impairment, net of origination fees or costs and lease incentives. Estimated income from operating lease assets, which includes lease origination fees, net of lease origination costs, is recorded as operating lease revenue on a straight-line basis over the term of the lease agreement. Leased vehicles are depreciated on a straight-line basis to an estimated residual value over the term of the lease agreements.
	We have significant investments in vehicles in operating lease portfolios, which are composed of vehicle leases to retail customers with lease terms of up to 60 months and vehicles leased to rental car companies with lease terms that average eight months or less. We are exposed to changes in the residual values of those assets. For impairment purposes the residual values represent estimates of the values of the vehicles leased at the end of the lease contracts and are determined based on forecasted auction proceeds when there is a reliable basis to make such a determination. Realization of the residual values is dependent on the future ability to market the vehicles under the prevailing market conditions. The adequacy of the estimate of the residual value is evaluated over the life of the lease and adjustments may be made to the extent the expected value of the vehicle at lease termination changes. Adjustments may be in the form of revisions to the depreciation rate or recognition of an impairment charge. Impairment is determined to exist if the expected future cash flows, which include estimated residual values, are lower than the carrying amount of the vehicles leased. If the carrying amount is considered impaired an impairment charge is recorded for the amount by which the carrying amount exceeds the fair value. Fair value is determined primarily using the anticipated cash flows, including estimated residual values.
	In our automotive operations when a leased vehicle is returned the asset is reclassified from Equipment on operating leases, net to Inventories at the lower of cost or estimated selling price, less cost to sell. Upon disposition proceeds are recorded in Automotive net sales and revenue and costs are recorded in Automotive cost of sales. In our automotive finance operations when a leased vehicle is returned or repossessed the asset is recorded in Other assets at the lower of cost or estimated selling price, less costs to sell. Upon disposition a gain or loss is recorded for any difference between the net book value of the leased asset and the proceeds from the disposition of the asset.
	Depreciation expense and impairment charges related to Equipment on operating leases, net are recorded in Automotive cost of sales or GM Financial operating and other expenses.
Valuation of Cost and Equity Method Investments, Policy [Policy Text Block]	Valuation of Cost and Equity Method Investments
	When events and circumstances warrant, investments accounted for under the cost or equity method of accounting are evaluated for impairment. An impairment charge is recorded whenever a decline in value of an investment below its carrying amount is determined to be other-than-temporary. Impairment charges related to equity method investments are recorded in Equity income. Impairment charges related to cost method investments are recorded in Interest income and other non-operating income, net.
Property, net, Policy [Policy Text Block]	Property, net
	Property, plant and equipment, including internal use software, is recorded at cost. Major improvements that extend the useful life or add functionality of property are capitalized. The gross amount of assets under capital leases is included in property, plant and equipment. Expenditures for repairs and maintenance are charged to expense as incurred. We depreciate all depreciable property using the straight-line method. Leasehold improvements are amortized over the period of lease or the life of the asset, whichever is shorter. The amortization of the assets under capital leases is included in depreciation expense. Upon retirement or disposition of property, plant and equipment, the cost and related accumulated depreciation are removed from the accounts and any resulting gain or loss is recorded in earnings. Impairment charges related to property are recorded in Automotive cost of sales, Automotive selling, general and administrative expense or GM Financial operating and other expenses.
	Special Tools
	Special tools represent product-specific powertrain and non-powertrain related tools, dies, molds and other items used in the vehicle manufacturing process. Expenditures for special tools are recorded at cost and are capitalized. We amortize all non-powertrain special tools over their estimated useful lives using an accelerated amortization method. We amortize powertrain special tools over their estimated useful lives using the straight-line method. Impairment charges related to special tools are recorded in Automotive cost of sales.
Goodwill, Policy [Policy Text Block]	Goodwill
	Goodwill arises from the application of fresh-start reporting and acquisitions accounted for as business combinations. Goodwill is tested for impairment for all reporting units on an annual basis as of October 1, or more frequently if events occur or circumstances change that would warrant such a review. Our reporting units are GMNA and GME and various reporting units within the GMIO, GMSA and GM Financial segments. When performing our goodwill impairment testing, the fair values of our reporting units are determined based on valuation techniques using the best available information, primarily discounted cash flow projections. We make significant assumptions and estimates, which utilize Level 3 measures, about the extent and timing of future cash flows, growth rates, market share and discount rates that represent unobservable inputs into our valuation methodologies. Our fair value estimates for annual and event-driven impairment tests assume the achievement of the future financial results contemplated in our forecasted cash flows and there can be no assurance that we will realize that value. The valuation methodologies utilized to perform our goodwill impairment testing were consistent with those used in our application of fresh-start reporting on July 10, 2009 and in any subsequent annual or event-driven goodwill impairment tests and utilized Level 3 measures. Because the fair value of goodwill can be measured only as a residual amount and cannot be determined directly we calculate the implied goodwill for those reporting units failing Step 1 in the same manner that goodwill is recognized in a business combination pursuant to Accounting Standards Codification (ASC) 805.
Intangible Assets, net Policy [Policy Text Block]	Intangible Assets, net
	Intangible assets, excluding goodwill, primarily include brand names, technology and intellectual property, customer relationships and dealer networks. Intangible assets are amortized on a straight-line or an accelerated method of amortization over their estimated useful lives. An accelerated amortization method reflecting the pattern in which the asset will be consumed is utilized if that pattern can be reliably determined. We consider the period of expected cash flows and underlying data used to measure the fair value of the intangible assets when selecting a useful life. Impairment charges related to intangible assets are recorded in Automotive selling, general and administrative expense or Automotive cost of sales. Amortization of developed technology and intellectual property is recorded in Automotive cost of sales. Amortization of brand names, customer relationships and our dealer networks is recorded in Automotive selling, general and administrative expense or GM Financial operating and other expenses.
Valuation of Long-Lived Assets, Policy [Policy Text Block]	Valuation of Long-Lived Assets
	The carrying amount of long-lived assets and finite-lived intangible assets to be held and used in the business are evaluated for impairment when events and circumstances warrant. If the carrying amount of a long-lived asset group is considered impaired, a loss is recorded based on the amount by which the carrying amount exceeds fair value. Product-specific long-lived asset groups are tested for impairment at the platform or vehicle line level and consider their geographical location. Non-product specific long-lived assets are tested for impairment on a reporting unit basis in GMNA and GME and tested at or within our various reporting units within our GMIO, GMSA and GM Financial segments. Fair value is determined using either the market or sales comparison approach, cost approach or anticipated cash flows discounted at a rate commensurate with the risk involved. Long-lived assets to be disposed of other than by sale are considered held for use until disposition. Product-specific assets may become impaired as a result of declines in profitability due to changes in volume, pricing or costs.
Pension and Other Postretirement Plans, Policy [Policy Text Block]	Pension and OPEB Plans
	Attribution, Methods and Assumptions
	The cost of benefits provided by defined benefit pension plans is recorded in the period employees provide service. The cost of pension plan amendments that provide for benefits already earned by plan participants is amortized over the expected period of benefit which may be: (1) the duration of the applicable collective bargaining agreement specific to the plan; (2) expected future working lifetime; or (3) the life expectancy of the plan participants.
	The cost of medical, dental, legal service and life insurance benefits provided through postretirement benefit plans is recorded in the period employees provide service. The cost of postretirement plan amendments that provide for benefits already earned by plan participants is amortized over the expected period of benefit which may be: (1) the average period to full eligibility; (2) the average life expectancy of the plan participants; or (3) the period to the plan's termination date for a plan which provides legal services.
	An expected return on plan asset methodology is utilized to calculate future pension expense for certain significant funded benefit plans. A market-related value of plan assets methodology is also utilized that averages gains and losses on the plan assets over a period of years to determine future pension expense. The methodology recognizes 60% of the difference between the fair value of assets and the expected calculated value in the first year and 10% of that difference over each of the next four years.
	The discount rate assumption is established for each of the retirement-related benefit plans at their respective measurement dates. In the U.S. we use a cash flow matching approach that uses projected cash flows matched to spot rates along a high quality corporate yield curve to determine the present value of cash flows to calculate a single equivalent discount rate.
	The benefit obligation for pension plans in Canada, the United Kingdom and Germany represents 92% of the non-U.S. pension benefit obligation at December 31, 2014. The discount rates for plans in Canada, the United Kingdom and Germany are determined using a cash flow matching approach similar to the U.S. approach.
	Plan Asset Valuation
	Due to the lack of timely available market information for certain investments in the asset classes described below as well as the inherent uncertainty of valuation, reported fair values may differ from fair values that would have been used had timely available market information been available.
	Cash Equivalents and Other Short-Term Investments
	Money market funds and other similar short-term investment funds are valued using the net asset value per share (NAV). Prices for short-term debt securities are received from independent pricing services or from dealers who make markets in such securities. Independent pricing services utilize matrix pricing which considers readily available inputs such as the yield or price of bonds of comparable quality, coupon, maturity and type as well as dealer supplied prices. Money market mutual funds which provide investors with the ability to redeem their interests on a daily basis and for which NAVs are publicly available are classified in Level 1. Other cash equivalents and short-term investments are classified in Level 2.
	Common and Preferred Stock
	Common and preferred stock for which market prices are readily available at the measurement date are valued at the last reported sale price or official closing price on the primary market or exchange on which they are actively traded and are classified in Level 1. Such equity securities for which the market is not considered to be active are valued via the use of observable inputs, which may include, among others, the use of adjusted market prices last available, bids or last available sales prices and/or other observable inputs and are classified in Level 2. Common and preferred stock classified in Level 3 are those privately issued securities or other issues that are valued via the use of valuation models using significant unobservable inputs that generally consider among others, aged (stale) pricing, earnings multiples, discounted cash flows and/or other qualitative and quantitative factors.
	Fixed Income Securities
	Fixed income securities are valued based on quotations received from independent pricing services or from dealers who make markets in such securities. Debt securities which are priced via the use of pricing services that utilize matrix pricing which considers readily observable inputs such as the yield or price of bonds of comparable quality, coupon, maturity and type as well as dealer supplied prices, are classified in Level 2. Fixed income securities within this category that are typically priced by dealers and pricing services via the use of proprietary pricing models which incorporate significant unobservable inputs are classified in Level 3. These inputs primarily consist of yield and credit spread assumptions, discount rates, prepayment curves, default assumptions and recovery rates.
	Investment Funds, Private Equity and Debt Investments and Real Estate Investments
	Investments in exchange traded funds, real estate investment trusts and mutual funds, for which market quotations are generally readily available, are valued at the last reported sale price, official closing price or publicly available NAV (or its equivalent) on the primary market or exchange on which they are traded and are classified in Level 1. Investments in private investment funds (including hedge funds, private equity funds and real estate funds) are generally valued based on their respective NAV (or its equivalent), as a practical expedient to estimate fair value due to the absence of readily available market prices. Investments in private investment funds, which may be fully redeemed at NAV in the near-term are generally classified in Level 2. Investments in funds, which may not be fully redeemed at NAV in the near-term, are generally classified in Level 3.
	Direct investments in private equity, private debt and real estate securities are generally valued in good faith via the use of the market approach (earnings multiples from comparable companies) or the income approach (discounted cash flow techniques), and consider inputs such as revenue growth and gross margin assumptions, discount rates, discounts for lack of liquidity, market capitalization rates and the selection of comparable companies. As these valuations incorporate significant unobservable inputs they are classified in Level 3.
	Fair value estimates for private investment funds, private equity, private debt and real estate investments are provided by the respective investment sponsors or investment advisers and are subsequently reviewed and approved by management. In the event management concludes a reported NAV or fair value estimate (collectively, external valuation) does not reflect fair value or is not determined as of the financial reporting measurement date, we will consider whether and when deemed necessary to make an adjustment at the balance sheet date. In determining whether an adjustment to the external valuation is required, we will review material factors that could affect the valuation, such as changes to the composition or performance of the underlying investments or comparable investments, overall market conditions, expected sale prices for private investments which are probable of being sold in the short-term and other economic factors that may possibly have a favorable or unfavorable effect on the reported external valuation.
	Derivatives
	Exchange traded derivatives, such as options and futures, for which market quotations are readily available, are valued at the last reported sale price or official closing price on the primary market or exchange on which they are traded and are classified in Level 1. Over-the-counter derivatives, including but not limited to swaps, swaptions and forwards, which are typically valued through independent pricing services with observable inputs are generally classified in Level 2. Swaps that are cleared by clearinghouses or exchanges are valued with the prices provided by those venues and are generally classified in Level 2. Derivatives classified in Level 3 are typically valued via the use of pricing models which incorporate significant unobservable inputs. The inputs part of the model based valuations may include extrapolated or model-derived assumptions such as volatilities, yield and credit spread assumptions.
Other Employee Benefits Policy [Policy Text Block]	Job Security Programs and Extended Disability Benefits
	We have job security programs to provide UAW and Unifor (combined union of the Canadian Auto Workers union and the Communications, Energy and Paperworkers Union of Canada) employees reduced wages and continued coverage under certain employee benefit programs depending on the employee's classification as well as the number of years of service that the employee has accrued. We also provide extended disability benefits for employees currently disabled and those in the active workforce who may become disabled in the form of income replacement, healthcare costs and life insurance premiums.
	We recognize a liability for job security programs and extended disability benefits over the expected service period using measurement provisions similar to those used to measure our OPEB obligations based on our best estimate of the probable liability at the measurement date. We record actuarial gains and losses immediately in earnings.
Stock Incentive Plans, Policy [Policy Text Block]	Stock Incentive Plans
	We measure and record compensation expense for all share-based payment awards based on the award's estimated fair value which is the fair value of our common stock on the date of grant for RSUs and Performance Share Units (PSUs). For awards that do not have an accounting grant date established, the compensation cost is based on the fair value of our common stock at the end of each reporting period. We record compensation cost for the awards on a straight-line basis over the entire vesting period, or for retirement eligible employees over the requisite service period. Salary stock awards granted are fully vested and nonforfeitable upon grant; therefore, compensation cost is recorded on the date of grant. The liability for stock incentive plan awards settled in cash is remeasured to fair value at the end of each reporting period.
Policy, Product Warranty and Recall Campaigns, Policy [Policy Text Block]	Policy, Product Warranty and Recall Campaigns
	The estimated costs related to policy and product warranties are accrued at the time products are sold and are charged to Automotive cost of sales. These estimates are established using historical information on the nature, frequency and average cost of claims of each vehicle line or each model year of the vehicle line and assumptions about future activity and events. Revisions are made when necessary based on changes in these factors. The estimated costs related to recall campaigns are accrued at the time of vehicle sale in GMNA and when probable and reasonably estimable in other geographical regions.
Income Taxes, Policy [Policy Text Block]	Income Taxes
	The liability method is used in accounting for income taxes. Deferred tax assets and liabilities are recorded for temporary differences between the tax basis of assets and liabilities and their reported amounts in the consolidated financial statements using the statutory tax rates in effect for the year in which the differences are expected to reverse. The effect on deferred tax assets and liabilities of a change in tax rates is recorded in the results of operations in the period that includes the enactment date under the law.
	Deferred income tax assets are evaluated quarterly to determine if valuation allowances are required or should be adjusted. We establish valuation allowances for deferred tax assets based on a more likely than not standard. The ability to realize deferred tax assets depends on the ability to generate sufficient taxable income within the carryback or carryforward periods provided for in the tax law for each applicable tax jurisdiction. The assessment regarding whether a valuation allowance is required or should be adjusted also considers all available positive and negative evidence factors. It is difficult to conclude a valuation allowance is not required when there is significant objective and verifiable negative evidence, such as cumulative losses in recent years. We utilize a rolling three years of actual and current year results as the primary measure of cumulative losses in recent years.
	Income tax expense (benefit) for the year is allocated between continuing operations and other categories of income such as Other comprehensive income (loss). In periods in which there is a pre-tax loss from continuing operations and pre-tax income in another income category, the tax benefit allocated to continuing operations is determined by taking into account the pre-tax income of other categories.
	We record uncertain tax positions on the basis of a two-step process whereby: (1) we determine whether it is more likely than not that the tax positions will be sustained based on the technical merits of the position; and (2) for those tax positions that meet the more likely than not recognition, we recognize the largest amount of tax benefit that is greater than 50% likely to be realized upon ultimate settlement with the related tax authority. We record interest and penalties on uncertain tax positions in Income tax expense (benefit).
Foreign Currency Transactions and Translation, Policy [Policy Text Block]	Foreign Currency Transactions and Translation
	The assets and liabilities of foreign subsidiaries that use the local currency as their functional currency are translated to U.S. Dollars based on the current exchange rate prevailing at each balance sheet date and any resulting translation adjustments are included in Accumulated other comprehensive loss. The assets and liabilities of foreign subsidiaries whose local currency is not their functional currency are remeasured from their local currency to their functional currency and then translated to U.S. Dollars. Revenues and expenses are translated into U.S. Dollars using the average exchange rates prevailing for each period presented.
	Gains and losses arising from foreign currency transactions and the effects of remeasurements discussed in the preceding paragraph are recorded in Automotive cost of sales and GM Financial operating and other expenses unless related to Automotive debt, which are recorded in Interest income and other non-operating income, net. Foreign currency transaction and remeasurement losses were $437 million, $350 million and $117 million in the years ended December 31, 2014, 2013 and 2012.
New Accounting Pronouncements, Policy [Policy Text Block]	Accounting Standards Not Yet Adopted
	In May 2014 the Financial Accounting Standards Board issued Accounting Standards Update (ASU) 2014-09, “Revenue from Contracts with Customers” (ASU 2014-09) which requires companies to recognize revenue when a customer obtains control rather than when companies have transferred substantially all risks and rewards of a good or service. This update is effective for annual reporting periods beginning on or after December 15, 2016 and interim periods therein and requires expanded disclosures. We are currently assessing the impact the adoption of ASU 2014-09 will have on our consolidated financial statements.

Significant_Accounting_Policie2

Significant Accounting Policies (Tables) (Automotive [Member])	12 Months Ended
	Dec. 31, 2014
Automotive [Member]
Allowance for Doubtful Accounts [Table Text Block]	The following table summarizes activity in our allowance for doubtful accounts and notes receivable related to our automotive operations (dollars in millions):
		Years Ended December 31,
		2014			2013			2012
	Balance at beginning of period	$	344		$	311		$	331
	Amounts charged (credited) to costs and expenses	50			61			(10		)
	Deductions	(8		)	(24		)	(46		)
	Effect of foreign currency and other	(46		)	(4		)	36
	Balance at end of period	$	340		$	344		$	311

Marketable_Securities_Tables

Marketable Securities (Tables)	12 Months Ended
	Dec. 31, 2014
Marketable Securities [Abstract]
Available-for-sale Securities [Table Text Block]	The following table summarizes information regarding marketable securities (dollars in millions):
		Fair Value Level		December 31, 2014						December 31, 2013
				Cost				Fair Value		Cost		Fair Value
	Cash and cash equivalents
	Available-for-sale securities
	U.S. government and agencies	2		$	1,600			$	1,600	$	1,437	$	1,437
	Sovereign debt	2		774				774		515		515
	Money market funds	1		2,480				2,480		1,262		1,262
	Corporate debt	2		6,036				6,036		7,598		7,598
	Total available-for-sale securities			$	10,890			10,890		$	10,812	10,812
	Trading securities
	Sovereign debt	2						431				—
	Corporate debt	2						—				25
	Total trading securities							431				25
	Total marketable securities classified as cash equivalents							11,321				10,837
	Cash, cash equivalents and time deposits							7,633				9,184
	Total cash and cash equivalents							$	18,954			$	20,021
	Marketable securities
	Available-for-sale securities
	U.S. government and agencies	2		$	5,957			$	5,957	$	5,343	$	5,344
	Corporate debt	2		2,000				1,998		1,889		1,891
	Total available-for-sale securities			$	7,957			7,955		$	7,232	7,235
	Trading securities – sovereign debt	2						1,267				1,737
	Total marketable securities							$	9,222			$	8,972
	Restricted cash and marketable securities
	Available-for-sale securities
	Money market funds	1		$	1,381			$	1,381	$	897	$	897
	Other	2		45				46		34		35
	Total marketable securities classified as restricted cash and marketable securities			$	1,426			1,427		$	931	932
	Restricted cash and cash equivalents and time deposits							846				1,144
	Total restricted cash and marketable securities							$	2,273			$	2,076
Trading Securities (and Certain Trading Assets) [Table Text Block]	The following table summarizes information regarding marketable securities (dollars in millions):
		Fair Value Level		December 31, 2014						December 31, 2013
				Cost				Fair Value		Cost		Fair Value
	Cash and cash equivalents
	Available-for-sale securities
	U.S. government and agencies	2		$	1,600			$	1,600	$	1,437	$	1,437
	Sovereign debt	2		774				774		515		515
	Money market funds	1		2,480				2,480		1,262		1,262
	Corporate debt	2		6,036				6,036		7,598		7,598
	Total available-for-sale securities			$	10,890			10,890		$	10,812	10,812
	Trading securities
	Sovereign debt	2						431				—
	Corporate debt	2						—				25
	Total trading securities							431				25
	Total marketable securities classified as cash equivalents							11,321				10,837
	Cash, cash equivalents and time deposits							7,633				9,184
	Total cash and cash equivalents							$	18,954			$	20,021
	Marketable securities
	Available-for-sale securities
	U.S. government and agencies	2		$	5,957			$	5,957	$	5,343	$	5,344
	Corporate debt	2		2,000				1,998		1,889		1,891
	Total available-for-sale securities			$	7,957			7,955		$	7,232	7,235
	Trading securities – sovereign debt	2						1,267				1,737
	Total marketable securities							$	9,222			$	8,972
	Restricted cash and marketable securities
	Available-for-sale securities
	Money market funds	1		$	1,381			$	1,381	$	897	$	897
	Other	2		45				46		34		35
	Total marketable securities classified as restricted cash and marketable securities			$	1,426			1,427		$	931	932
	Restricted cash and cash equivalents and time deposits							846				1,144
	Total restricted cash and marketable securities							$	2,273			$	2,076
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The following table summarizes information regarding marketable securities (dollars in millions):
		Fair Value Level		December 31, 2014						December 31, 2013
				Cost				Fair Value		Cost		Fair Value
	Cash and cash equivalents
	Available-for-sale securities
	U.S. government and agencies	2		$	1,600			$	1,600	$	1,437	$	1,437
	Sovereign debt	2		774				774		515		515
	Money market funds	1		2,480				2,480		1,262		1,262
	Corporate debt	2		6,036				6,036		7,598		7,598
	Total available-for-sale securities			$	10,890			10,890		$	10,812	10,812
	Trading securities
	Sovereign debt	2						431				—
	Corporate debt	2						—				25
	Total trading securities							431				25
	Total marketable securities classified as cash equivalents							11,321				10,837
	Cash, cash equivalents and time deposits							7,633				9,184
	Total cash and cash equivalents							$	18,954			$	20,021
	Marketable securities
	Available-for-sale securities
	U.S. government and agencies	2		$	5,957			$	5,957	$	5,343	$	5,344
	Corporate debt	2		2,000				1,998		1,889		1,891
	Total available-for-sale securities			$	7,957			7,955		$	7,232	7,235
	Trading securities – sovereign debt	2						1,267				1,737
	Total marketable securities							$	9,222			$	8,972
	Restricted cash and marketable securities
	Available-for-sale securities
	Money market funds	1		$	1,381			$	1,381	$	897	$	897
	Other	2		45				46		34		35
	Total marketable securities classified as restricted cash and marketable securities			$	1,426			1,427		$	931	932
	Restricted cash and cash equivalents and time deposits							846				1,144
	Total restricted cash and marketable securities							$	2,273			$	2,076
Investments Classified by Contractual Maturity Date [Table Text Block]	The following table summarizes the amortized cost and the fair value of investments classified as available-for-sale by contractual maturity at December 31, 2014 (dollars in millions):
		Amortized Cost				Fair Value
	Due in one year or less	$	14,461			$	14,461
	Due after one year through five years	1,951				1,950
	Total contractual maturities of available-for-sale securities	$	16,412			$	16,411

GM_Financial_Receivables_net_T

GM Financial Receivables, net (Tables) (GM Financial [Member])	12 Months Ended
	Dec. 31, 2014
Finance Receivables [Line Items]
Finance Receivables, Net [Table Text Block]	The following table summarizes the components of consumer and commercial finance receivables, net (dollars in millions):
		December 31, 2014											December 31, 2013
		Consumer			Commercial				Total				Consumer			Commercial			Total
	Pre-acquisition finance receivables, outstanding amount	$	508		$	—			$	508			$	1,294		$	—		$	1,294
	Pre-acquisition finance receivables, carrying amount	$	459		$	—			$	459			$	1,174		$	—		$	1,174
	Post-acquisition finance receivables, net of fees	25,164			7,606				32,770				21,956			6,050			28,006
	Finance receivables	25,623			7,606				33,229				23,130			6,050			29,180
	Less: allowance for loan losses	(655		)	(40		)		(695		)		(497		)	(51		)	(548		)
	GM Financial receivables, net	$	24,968		$	7,566			$	32,534			$	22,633		$	5,999		$	28,632
	Fair value of GM Financial receivables, net								$	33,106									$	28,668
	Allowance for loan losses classified as current at December 31, 2014 and 2013 were $529 million and $427 million.
Allowance for Doubtful Accounts [Table Text Block]	The following table summarizes activity for the allowance for loan losses on consumer and commercial finance receivables (dollars in millions):
		Years Ended December 31,
		2014			2013				2012
	Balance at beginning of period	$	548		$	351			$	179
	Provision for loan losses	604			475				304
	Charge-offs	(914		)	(643		)		(304		)
	Recoveries	470			362				172
	Effect of foreign currency	(13		)	3				—
	Balance at end of period	$	695		$	548			$	351
Consumer Finance Receivable [Member]
Finance Receivables [Line Items]
Consumer Finance Receivables Delinquency [Table Text Block]	The following table summarizes the contractual amount of delinquent contracts, which is not significantly different than the recorded investment of the consumer finance receivables (dollars in millions):
		December 31, 2014						December 31, 2013
		Amount			Percent of Contractual Amount Due			Amount				Percent of Contractual Amount Due
	31-to-60 days delinquent	$	1,083		4.2	%		$	952			4.1	%
	Greater-than-60 days delinquent	432			1.7	%		408				1.7	%
	Total finance receivables more than 30 days delinquent	1,515			5.9	%		1,360				5.8	%
	In repossession	40			0.2	%		41				0.2	%
	Total finance receivables more than 30 days delinquent or in repossession	$	1,555		6.1	%		$	1,401			6	%
Troubled Debt Restructurings on Finance Receivables [Table Text Block]	The following table summarizes the outstanding recorded investment for consumer finance receivables that are considered to be TDRs and the related allowance (dollars in millions):
		December 31, 2014			December 31, 2013
	Outstanding recorded investment	$	1,234		$	767
	Less: allowance for loan losses	(172		)	(103		)
	Outstanding recorded investment, net of allowance	$	1,062		$	664
	Unpaid principal balance	$	1,255		$	779
Commercial Finance Receivables [Member]
Finance Receivables [Line Items]
Finance Receivables Credit Quality [Table Text Block]	The following table summarizes the credit risk profile by dealer grouping of the commercial finance receivables (dollars in millions):
		December 31, 2014			December 31, 2013
	Group I - Dealers with superior financial metrics	$	1,050		$	549
	Group II - Dealers with strong financial metrics	2,022			1,460
	Group III - Dealers with fair financial metrics	2,599			1,982
	Group IV - Dealers with weak financial metrics	1,173			1,462
	Group V - Dealers warranting special mention due to potential weaknesses	524			385
	Group VI - Dealers with loans classified as substandard, doubtful or impaired	238			212
		$	7,606		$	6,050

Inventories_Tables

Inventories (Tables)	12 Months Ended
	Dec. 31, 2014
Inventory Disclosure [Abstract]
Components of Inventory [Table Text Block]	The following table summarizes the components of Inventories (dollars in millions):
		December 31, 2014		December 31, 2013
	Productive material, supplies and work in process	$	5,380	$	5,872
	Finished product, including service parts	8,262		8,167
	Total inventories	$	13,642	$	14,039

Equipment_on_Operating_Leases_1

Equipment on Operating Leases, net (Tables) (Vehicles [Member])	12 Months Ended
	Dec. 31, 2014
Automotive [Member]
Property Subject to or Available for Operating Lease [Line Items]
Schedule of Equipment on Operating Leases [Table Text Block]	The following tables summarize information related to Equipment on operating leases, net (dollars in millions):
		December 31, 2014			December 31, 2013
	Equipment on operating leases	$	3,822		$	2,605
	Less: accumulated depreciation	(258		)	(207		)
	Equipment on operating leases, net	$	3,564		$	2,398
Schedule Of Equipment on Operating Leases Depreciation and Impairment [Table Text Block]
		Years Ended December 31,
		2014			2013			2012
	Depreciation expense	$	507		$	218		$	227
	Impairment charges	$	155		$	168		$	181
GM Financial [Member]
Property Subject to or Available for Operating Lease [Line Items]
Schedule of Equipment on Operating Leases [Table Text Block]	The following table summarizes GM Financial equipment on operating leases, net (dollars in millions):
		December 31, 2014			December 31, 2013
	GM Financial equipment on operating leases	$	8,268		$	4,025
	Less: accumulated depreciation	(1,208		)	(642		)
	GM Financial equipment on operating leases, net	$	7,060		$	3,383
Schedule of Future Minimum Rental Payments Receivable for Operating Leases [Table Text Block]	The following table summarizes minimum rental payments due to GM Financial as lessor under operating leases (dollars in millions):
		2015			2016			2017		2018		2019
	Minimum rental receipts under operating leases	$	1,241		$	1,019		$	597	$	98	$	5

Equity_In_Net_Assets_Of_Noncon1

Equity In Net Assets Of Nonconsolidated Affiliates (Tables)	12 Months Ended
	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Schedule of Equity Income [Table Text Block]	The following table summarizes information regarding Equity income (dollars in millions):
		Years Ended December 31,
		2014			2013		2012
	China JVs	$	2,066		$	1,763	$	1,521
	Others	28			47		41
	Total equity income	$	2,094		$	1,810	$	1,562
Schedule of Equity Method Investments [Table Text Block]	The following table summarizes our direct ownership interests in China JVs:
		December 31, 2014		December 31, 2013
	Shanghai General Motors Co., Ltd. (SGM)	50	%	50	%
	Shanghai GM Norsom Motor Co., Ltd. (SGM Norsom)	25	%	25	%
	Shanghai GM Dong Yue Motors Co., Ltd. (SGM DY)	25	%	25	%
	Shanghai GM Dong Yue Powertrain (SGM DYPT)	25	%	25	%
	SAIC-GM-Wuling Automobile Co., Ltd.	44	%	44	%
	FAW-GM Light Duty Commercial Vehicle Co., Ltd.	50	%	50	%
	Pan Asia Technical Automotive Center Co., Ltd.	50	%	50	%
	Shanghai OnStar Telematics Co., Ltd. (Shanghai OnStar)	40	%	40	%
	Shanghai Chengxin Used Car Operation and Management Co., Ltd. (Shanghai Chengxin Used Car)	33	%	33	%
	SAIC General Motors Sales Co., Ltd. (SGMS)	49	%	49	%
Carrying Amount of Investments in Nonconsolidated Affiliates [Table Text Block]	The following table summarizes the carrying amount of investments in nonconsolidated affiliates (dollars in millions):
		December 31, 2014			December 31, 2013
	China JVs	$	8,140		$	7,851
	Other investments	210			243
	Total equity in net assets of nonconsolidated affiliates	$	8,350		$	8,094
Summarized Financial Data for Nonconsolidated Affiliates [Table Text Block]	The following tables present summarized financial data for nonconsolidated affiliates (dollars in millions):
		31-Dec-14								31-Dec-13
		China JVs			Others		Total			China JVs		Others		Total
	Summarized Balance Sheet Data
	Current assets	$	15,442		$	2,636	$	18,078		$	14,666	$	2,234	$	16,900
	Non-current assets	9,758			1,507		11,265			8,187		1,458		9,645
	Total assets	$	25,200		$	4,143	$	29,343		$	22,853	$	3,692	$	26,545
	Current liabilities	$	16,141		$	2,179	$	18,320		$	14,019	$	1,859	$	15,878
	Non-current liabilities	931			495		1,426			1,065		511		1,576
	Total liabilities	$	17,072		$	2,674	$	19,746		$	15,084	$	2,370	$	17,454
	Non-controlling interests	$	1,043		$	3	$	1,046		$	1,040	$	—	$	1,040
		Years Ended December 31,
		2014			2013		2012
	Summarized Operating Data
	China JVs' net sales	$	43,853		$	38,767	$	33,364
	Others' net sales	3,171			1,830		3,963
	Total net sales	$	47,024		$	40,597	$	37,327
	China JVs' net income	$	4,312		$	3,685	$	3,198
	Others' net income (loss)	91			50		(23		)
	Total net income	$	4,403		$	3,735	$	3,175
Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Transactions with Nonconsolidated Affiliates [Table Text Block]	The following tables summarize transactions with nonconsolidated affiliates (dollars in millions):
		Years Ended December 31,
		2014			2013		2012
	Automotive sales and revenue	$	2,762		$	2,724	$	2,572
	Automotive purchases, net	$	311		$	724	$	497
	Interest income and other non-operating income, net	$	23		$	19	$	184
	Operating cash flows	$	4,321		$	3,607	$	3,385
		December 31, 2014			December 31, 2013
	Accounts and notes receivable, net	$	706		$	756
	Accounts payable	$	205		$	183

Property_net_Tables

Property, net (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment [Table Text Block]	The following table summarizes the components of Property, net (dollars in millions):
		Estimated Useful Lives in Years		December 31, 2014				December 31, 2013
	Land			$	1,695			$	1,868
	Buildings and improvements	May-40		5,236				4,971
	Machinery and equipment	27-Mar		16,788				15,222
	Construction in progress			4,114				2,644
	Real estate, plants and equipment			27,833				24,705
	Less: accumulated depreciation			(8,067		)		(6,787		)
	Real estate, plants and equipment, net			19,766				17,918
	Special tools, net	15-Jan		7,977				7,949
	Total property, net			$	27,743			$	25,867
Depreciation Amortization and Impairment on Property Plant and Equipment [Table Text Block]	The following table summarizes depreciation, amortization and impairment charges related to Property, net (dollars in millions):
		Years Ended December 31,
		2014				2013				2012
	Depreciation and amortization expense	$	4,187			$	3,959			$	3,888
	Impairment charges(a)	709				901				3,793
	Depreciation, amortization and impairment charges	$	4,896			$	4,860			$	7,681
	Capitalized software amortization expense(b)	$	295			$	244			$	209
	__________
	(a)	Includes impairment charges of $321 million and $179 million at GMIO and GME whose assets were written down to fair values of $85 million and $11 million at December 31, 2014. Also includes other assets whose fair value was determined to be $0 in the years ended December 31, 2014, 2013 and 2012 measured utilizing Level 3 inputs. Fair value measurements of the non-GMIO and non-GME asset group long-lived assets utilized projected cash flows discounted at a rate commensurate with the perceived business risks related to the assets involved.
	(b)	Included in total depreciation, impairment charges and amortization expense.
Property, Plant and Equipment [Member] | Level 3 [Member]
Property, Plant and Equipment [Line Items]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block]	The following table summarizes the significant Level 3 inputs for real and personal property measurements:
		Valuation Technique(s)		Unobservable Input(s)		Range
	GM India personal property	Market approach		Economic obsolescence(a)		72% - 100%
	Holden real property	Income approach		Holding period(b)		0 - 3 years
				Discount rate(c)		11% - 12%
	GME real property	Market approach		Demolition costs(d)		6% - 23%
		Cost approach		Holding period(b)		0 - 4 years
		Income approach		Discount rate(c)		11.2% - 14.5%
	GME personal property	Market approach		Physical deterioration(e)		52% - 69%
		Cost approach		Functional obsolescence(f)		8% - 28%
				Economic obsolescence(a)		17% - 23%
	__________
	(a)	Represents estimated loss in asset value caused by factors external to the asset such as legislative enactments, changes in use, social change and change in supply and demand.
	(b)	Represents estimated marketing period for each property which dictates the amount of property specific holding costs to be incurred such as real estate taxes.
	(c)	Represents the discount rate for the specific property based on local market sources and available benchmarking data.
	(d)	Represents estimated gross cost to demolish and clear the structures on the property as a percentage of replacement cost new.
	(e)	Represents estimated loss in asset value due to wear and tear, action of the elements and other physical factors that reduce the life and serviceability of the asset.
	(f)	Represents estimated loss in asset value caused by inefficiencies and inadequacies of the asset itself.

Goodwill_Tables

Goodwill (Tables)	12 Months Ended
	Dec. 31, 2014
Goodwill [Abstract]
Schedule of Goodwill [Table Text Block]	The following table summarizes the changes in the carrying amounts of Goodwill (dollars in millions):
		Automotive			GM Financial		Total
	Balance at January 1, 2013	$	695		$	1,278	$	1,973
	Impairment charges	(541		)	—		(541		)
	Goodwill from business combinations(a)	10			144		154
	Effect of foreign currency and other	(26		)	—		(26		)
	Balance at December 31, 2013	138			1,422		1,560
	Impairment charges	(120		)	—		(120		)
	Effect of foreign currency and other	(18		)	5		(13		)
	Balance at December 31, 2014	$	—		$	1,427	$	1,427
	Accumulated impairment charges at January 1, 2013	$	(29,897	)	$	—	$	(29,897	)
	Accumulated impairment charges at December 31, 2013	$	(30,438	)	$	—	$	(30,438	)
	Accumulated impairment charges at December 31, 2014	$	(30,558	)	$	—	$	(30,558	)
	_________
	(a)	Refer to Note 3 for additional information concerning the acquisitions.

Intangible_Assets_net_Tables

Intangible Assets, net (Tables)	12 Months Ended
	Dec. 31, 2014
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]
Summary of Components of Intangible Assets, net [Table Text Block]	The following table summarizes the components of Intangible assets, net (dollars in millions):
		December 31, 2014							December 31, 2013
		Gross Carrying Amount			Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
	Technology and intellectual property	$	8,193		$	7,744	$	449	$	8,210	$	7,308	$	902
	Brands	4,447			683		3,764		4,466		559		3,907
	Dealer network and customer relationships	1,094			434		660		1,108		364		744
	Favorable contracts and other	345			331		14		345		326		19
	Total amortizing intangible assets	14,079			9,192		4,887		14,129		8,557		5,572
	Nonamortizing in process research and development	96					96		96				96
	Total intangible assets	$	14,175		$	9,192	$	4,983	$	14,225	$	8,557	$	5,668
Summary of Amortization Expense and Impairment Charges Related to Intangible Assets [Table Text Block]	The following table summarizes the amortization expense and impairment charges related to Intangible assets, net (dollars in millions):
		Years Ended December 31,
		2014			2013		2012
	Amortization expense	$	676		$	1,281	$	1,568
	Impairment charges	$	16		$	523	$	1,755
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	The following table summarizes estimated amortization expense related to Intangible assets, net in each of the next five years (dollars in millions):
		2015			2016		2017		2018		2019
	Estimated amortization expense	$	332		$	311	$	306	$	302	$	205
Brands [Member] | Level 3 [Member] | GME [Member]
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block]	The following table summarizes the significant Level 3 inputs for brand intangible assets measurements:
			Valuation Technique	Unobservable Input(s)		Percentage
	Brand intangible assets		Income approach	Long-term growth rate		0.50%
				Pre-tax royalty rate(a)		0.14%
				Discount rate(b)		21.25%
	__________
	(a)	Represents estimated savings realized from owning the asset or having the royalty-free right to use the asset.
	(b)	Represents WACC adjusted for perceived business risks related to these intangible assets.

Variable_Interest_Entities_Tab

Variable Interest Entities (Tables) (Consolidated VIE [Member], GM Financial [Member])	12 Months Ended
	Dec. 31, 2014
Consolidated VIE [Member] | GM Financial [Member]
Variable Interest Entity [Line Items]
Schedule of Variable Interest Entities [Table Text Block]	The following table summarizes the assets and liabilities related to GM Financial's consolidated VIEs prior to intercompany eliminations (dollars in millions):
		December 31, 2014		December 31, 2013
	Restricted cash	$	1,721	$	1,523
	Securitized Assets	$	27,704	$	23,584
	Securitization notes payable and other credit facilities	$	22,794	$	19,448

Accrued_Liabilities_and_Other_1

Accrued Liabilities and Other Liabilities (Tables)	12 Months Ended
	Dec. 31, 2014
Accrued Liabilities and Other Liabilities [Abstract]
Accrued Liabilities and Other Liabilities[Table Text Block]	The following table summarizes the components of Accrued liabilities and Other liabilities (dollars in millions):
		December 31, 2014			December 31, 2013
	Current
	Dealer and customer allowances, claims and discounts	$	8,035		$	7,919
	Deposits primarily from rental car companies	6,089			4,713
	Deferred revenue	1,622			1,276
	Product warranty and related liabilities	3,582			2,721
	Payrolls and employee benefits excluding postemployment benefits	2,144			2,285
	Other	6,712			5,719
	Total accrued liabilities	$	28,184		$	24,633
	Non-current
	Deferred revenue	$	1,556		$	1,249
	Product warranty and related liabilities	6,064			4,880
	Employee benefits excluding postemployment benefits	1,049			1,192
	Postemployment benefits including facility idling reserves	1,259			1,216
	Other	4,154			4,816
	Total other liabilities	$	14,082		$	13,353
Product Warranty and Related Liabilities	The following table summarizes activity for product warranty and related liabilities which include policy, product warranty, recall campaigns and courtesy transportation (dollars in millions):
		Years Ended December 31,
		2014			2013			2012
	Beginning balance	$	7,601		$	7,633		$	7,031
	Warranties issued and assumed in period - recall campaigns and courtesy transportation	2,910			640			775
	Warranties issued and assumed in period - policy and warranty	2,540			2,757			2,840
	Payments	(4,326		)	(3,240		)	(3,575		)
	Adjustments to pre-existing warranties	1,187			49			504
	Effect of foreign currency and other	(266		)	(238		)	58
	Ending balance	$	9,646		$	7,601		$	7,633

ShortTerm_and_LongTerm_Debt_Ta

Short-Term and Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2014
Interest Expense [Table Text Block]	The following table summarizes interest expense (dollars in millions):
		Years Ended December 31,
		2014			2013			2012
	Automotive	$	403		$	334		$	489
	Automotive Financing - GM Financial	1,426			715			283
	Total interest expense	$	1,829		$	1,049		$	772
Schedule of Maturities of Long-term Debt [Table Text Block]	The following table summarizes contractual maturities including capital leases at December 31, 2014 (dollars in millions):
		Automotive			Automotive Financing(a)			Total
	2015	$	503		$	14,491		$	14,994
	2016	174			9,177			9,351
	2017	511			7,255			7,766
	2018	1,600			2,666			4,266
	2019	109			1,860			1,969
	Thereafter	7,194			2,000			9,194
		$	10,091		$	37,449		$	47,540
	________
	(a)	Secured debt, credit facilities and other unsecured debt are based on expected payoff date. Senior notes principal amounts are based on maturity.
Automotive [Member]
Debt carrying amount and fair value [Table Text Block]	The following table summarizes the components of our short-term and long-term debt (dollars in millions):
		December 31, 2014			December 31, 2013
	Secured debt	$	237		$	320
	Unsecured debt	8,205			5,852
	Capital leases	968			965
	Total automotive debt(a)	$	9,410		$	7,137
	Fair value of automotive debt	$	9,799		$	6,837
	Available under credit facility agreements	$	12,026		$	10,404
	Interest rate range on outstanding debt(b)	0.0-18.0%			0.0-19.0%
	Weighted-average interest rate on outstanding short-term debt(b)	6.4		%	9		%
	Weighted-average interest rate on outstanding long-term debt(b)	4.3		%	3.8		%
	__________
	(a)	Net of a $681 million and $765 million net discount at December 31, 2014 and 2013.
	(b)	Includes coupon rates on debt denominated in various foreign currencies and interest free loans.
GM Financial [Member]
Debt carrying amount and fair value [Table Text Block]	The following table summarizes the carrying amount and fair value of debt (dollars in millions):
			December 31, 2014						December 31, 2013
			Carrying Amount			Fair Value			Carrying Amount		Fair Value
	Secured debt		$	25,214		$	25,228		$	22,073	$	22,170
	Unsecured debt		12,217			12,479			6,973		7,078
	Total GM Financial debt		$	37,431		$	37,707		$	29,046	$	29,248

Pensions_And_Other_Postretirem1

Pensions And Other Postretirement Benefits (Tables)	12 Months Ended
	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Schedule of Amounts Recognized in Balance Sheet [Table Text Block]	The following table summarizes the change in benefit obligations and related plan assets (dollars in millions):
		Year Ended December 31, 2014														Year Ended December 31, 2013
		Pension Benefits								Other Benefits						Pension Benefits						Other Benefits
		U.S. Plans				Non-U.S. Plans				U.S. Plans			Non-U.S. Plans			U.S. Plans			Non-U.S. Plans			U.S. Plans			Non-U.S. Plans
	Change in benefit obligations
	Beginning benefit obligation	$	71,480			$	27,528			$	5,110		$	1,238		$	82,110		$	29,301		$	6,271		$	1,528
	Service cost	247				358				13			10			298			394			24			13
	Interest cost	3,060				1,031				218			55			2,837			1,010			217			57
	Amendments	—				17				—			—			—			(4		)	—			(4		)
	Actuarial (gains) losses	7,770				3,179				331			117			(7,661		)	(1,009		)	(757		)	(210		)
	Benefits paid	(5,779		)		(1,699		)		(376		)	(50		)	(5,719		)	(1,683		)	(422		)	(53		)
	Foreign currency translation adjustments	—				(2,536		)		—			(108		)	—			(528		)	—			(98		)
	Curtailments, settlements and other	(54		)		19				(7		)	74			(385		)	47			(223		)	5
	Ending benefit obligation	76,724				27,897				5,289			1,336			71,480			27,528			5,110			1,238
	Change in plan assets
	Beginning fair value of plan assets	64,166				14,986				—			—			68,085			15,541			—			—
	Actual return on plan assets	7,346				1,893				—			—			2,107			988			—			—
	Employer contributions	143				770				354			48			128			886			393			51
	Benefits paid	(5,779		)		(1,699		)		(376		)	(50		)	(5,719		)	(1,683		)	(422		)	(53		)
	Foreign currency translation adjustments	—				(1,232		)		—			—			—			(692		)	—			—
	Settlements and other	(53		)		(49		)		22			2			(435		)	(54		)	29			2
	Ending fair value of plan assets	65,823				14,669				—			—			64,166			14,986			—			—
	Ending funded status	$	(10,901	)		$	(13,228	)		$	(5,289	)	$	(1,336	)	$	(7,314	)	$	(12,542	)	$	(5,110	)	$	(1,238	)
	Amounts recorded in the consolidated balance sheets
	Non-current assets	$	—			$	111			$	—		$	—		$	—		$	137		$	—		$	—
	Current liabilities	(69		)		(383		)		(338		)	(58		)	(131		)	(379		)	(368		)	(83		)
	Non-current liabilities	(10,832		)		(12,956		)		(4,951		)	(1,278		)	(7,183		)	(12,300		)	(4,742		)	(1,155		)
	Net amount recorded	$	(10,901	)		$	(13,228	)		$	(5,289	)	$	(1,336	)	$	(7,314	)	$	(12,542	)	$	(5,110	)	$	(1,238	)
	Amounts recorded in Accumulated other comprehensive loss
	Net actuarial gain (loss)	$	452			$	(5,019	)		$	(859	)	$	(83	)	$	4,747		$	(3,379	)	$	(542	)	$	47
	Net prior service (cost) credit	35				(57		)		16			72			38			(87		)	19			91
	Total recorded in Accumulated other comprehensive loss	$	487			$	(5,076	)		$	(843	)	$	(11	)	$	4,785		$	(3,466	)	$	(523	)	$	138
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block]	The following table summarizes the change in benefit obligations and related plan assets (dollars in millions):
		Year Ended December 31, 2014														Year Ended December 31, 2013
		Pension Benefits								Other Benefits						Pension Benefits						Other Benefits
		U.S. Plans				Non-U.S. Plans				U.S. Plans			Non-U.S. Plans			U.S. Plans			Non-U.S. Plans			U.S. Plans			Non-U.S. Plans
	Change in benefit obligations
	Beginning benefit obligation	$	71,480			$	27,528			$	5,110		$	1,238		$	82,110		$	29,301		$	6,271		$	1,528
	Service cost	247				358				13			10			298			394			24			13
	Interest cost	3,060				1,031				218			55			2,837			1,010			217			57
	Amendments	—				17				—			—			—			(4		)	—			(4		)
	Actuarial (gains) losses	7,770				3,179				331			117			(7,661		)	(1,009		)	(757		)	(210		)
	Benefits paid	(5,779		)		(1,699		)		(376		)	(50		)	(5,719		)	(1,683		)	(422		)	(53		)
	Foreign currency translation adjustments	—				(2,536		)		—			(108		)	—			(528		)	—			(98		)
	Curtailments, settlements and other	(54		)		19				(7		)	74			(385		)	47			(223		)	5
	Ending benefit obligation	76,724				27,897				5,289			1,336			71,480			27,528			5,110			1,238
	Change in plan assets
	Beginning fair value of plan assets	64,166				14,986				—			—			68,085			15,541			—			—
	Actual return on plan assets	7,346				1,893				—			—			2,107			988			—			—
	Employer contributions	143				770				354			48			128			886			393			51
	Benefits paid	(5,779		)		(1,699		)		(376		)	(50		)	(5,719		)	(1,683		)	(422		)	(53		)
	Foreign currency translation adjustments	—				(1,232		)		—			—			—			(692		)	—			—
	Settlements and other	(53		)		(49		)		22			2			(435		)	(54		)	29			2
	Ending fair value of plan assets	65,823				14,669				—			—			64,166			14,986			—			—
	Ending funded status	$	(10,901	)		$	(13,228	)		$	(5,289	)	$	(1,336	)	$	(7,314	)	$	(12,542	)	$	(5,110	)	$	(1,238	)
	Amounts recorded in the consolidated balance sheets
	Non-current assets	$	—			$	111			$	—		$	—		$	—		$	137		$	—		$	—
	Current liabilities	(69		)		(383		)		(338		)	(58		)	(131		)	(379		)	(368		)	(83		)
	Non-current liabilities	(10,832		)		(12,956		)		(4,951		)	(1,278		)	(7,183		)	(12,300		)	(4,742		)	(1,155		)
	Net amount recorded	$	(10,901	)		$	(13,228	)		$	(5,289	)	$	(1,336	)	$	(7,314	)	$	(12,542	)	$	(5,110	)	$	(1,238	)
	Amounts recorded in Accumulated other comprehensive loss
	Net actuarial gain (loss)	$	452			$	(5,019	)		$	(859	)	$	(83	)	$	4,747		$	(3,379	)	$	(542	)	$	47
	Net prior service (cost) credit	35				(57		)		16			72			38			(87		)	19			91
	Total recorded in Accumulated other comprehensive loss	$	487			$	(5,076	)		$	(843	)	$	(11	)	$	4,785		$	(3,466	)	$	(523	)	$	138
Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]	The following table summarizes the total accumulated benefit obligations (ABO), the fair value of plan assets for defined benefit pension plans with ABO in excess of plan assets, and the projected benefit obligation (PBO) and fair value of plan assets for defined benefit pension plans with PBO in excess of plan assets (dollars in millions):
		December 31, 2014								December 31, 2013
		U.S. Plans				Non-U.S. Plans				U.S. Plans			Non-U.S. Plans
	ABO	$	76,702			$	27,425			$	71,461		$	27,069
	Plans with ABO in excess of plan assets
	ABO	$	76,702			$	26,510			$	71,461		$	25,897
	Fair value of plan assets	$	65,823			$	13,638			$	64,166		$	13,663
	Plans with PBO in excess of plan assets
	PBO	$	76,724			$	26,935			$	71,480		$	26,788
	Fair value of plan assets	$	65,823			$	13,643			$	64,166		$	14,109
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]	The following table summarizes the total accumulated benefit obligations (ABO), the fair value of plan assets for defined benefit pension plans with ABO in excess of plan assets, and the projected benefit obligation (PBO) and fair value of plan assets for defined benefit pension plans with PBO in excess of plan assets (dollars in millions):
		December 31, 2014								December 31, 2013
		U.S. Plans				Non-U.S. Plans				U.S. Plans			Non-U.S. Plans
	ABO	$	76,702			$	27,425			$	71,461		$	27,069
	Plans with ABO in excess of plan assets
	ABO	$	76,702			$	26,510			$	71,461		$	25,897
	Fair value of plan assets	$	65,823			$	13,638			$	64,166		$	13,663
	Plans with PBO in excess of plan assets
	PBO	$	76,724			$	26,935			$	71,480		$	26,788
	Fair value of plan assets	$	65,823			$	13,643			$	64,166		$	14,109
Schedule of Net Benefit Costs [Table Text Block]	The following table summarizes the components of net periodic pension and OPEB expense along with the assumptions used to determine benefit obligations (dollars in millions):
		Year Ended December 31, 2014														Year Ended December 31, 2013												Year Ended December 31, 2012
		Pension Benefits								Other Benefits						Pension Benefits						Other Benefits						Pension Benefits						Other Benefits
		U.S. Plans				Non-U.S. Plans				U.S. Plans			Non-U.S. Plans			U.S. Plans			Non-U.S. Plans			U.S. Plans			Non-U.S. Plans			U.S. Plans			Non-U.S. Plans			U.S. Plans			Non-U.S. Plans
	Components of expense
	Service cost	$	380			$	389			$	13		$	10		$	395		$	425		$	24		$	13		$	590		$	411		$	23		$	16
	Interest cost	3,060				1,031				218			55			2,837			1,010			217			57			4,055			1,110			234			63
	Expected return on plan assets	(3,914		)		(873		)		—			—			(3,562		)	(823		)	—			—			(5,029		)	(870		)	—			—
	Amortization of prior service cost (credit)	(4		)		17				(2		)	(14		)	(4		)	19			(116		)	(14		)	(1		)	1			(116		)	(12		)
	Recognized net actuarial loss	(91		)		154				14			(6		)	6			208			85			6			2			35			52			6
	Curtailments, settlements and other	(1		)		3				—			—			(77		)	(6		)	(62		)	—			2,580			71			—			11
	Net periodic expense (income)	$	(570	)		$	721			$	243		$	45		$	(405	)	$	833		$	148		$	62		$	2,197		$	758		$	193		$	84
	Weighted-average assumptions used to determine benefit obligations
	Discount rate	3.73		%		3.14		%		3.8		%	3.99		%	4.46		%	4.1		%	4.52		%	4.71		%	3.59		%	3.7		%	3.68		%	3.97		%
	Rate of compensation increase(a)	N/A				2.85		%		N/A			4.21		%	N/A			2.9		%	N/A			4.21		%	N/A			2.77		%	4.5		%	4.21		%
	Weighted-average assumptions used to determine net expense
	Discount rate	4.46		%		4.1		%		4.52		%	4.71		%	3.59		%	3.69		%	3.69		%	3.97		%	4.06		%	4.45		%	4.24		%	4.31		%
	Expected rate of return on plan assets	6.53		%		6.28		%		N/A			N/A			5.77		%	5.7		%	N/A			N/A			6.18		%	6.2		%	N/A			N/A
	Rate of compensation increase(a)	N/A				2.9		%		N/A			4.21		%	N/A			2.77		%	4.5		%	4.21		%	4.5		%	3.15		%	4.5		%	4.21		%
	_________
	(a)	As a result of ceasing the accrual of additional benefits for salaried plan participants, the rate of compensation increase does not have a significant effect on our U.S. pension and OPEB plans.
Schedule of Assumptions Used [Table Text Block]	The following table summarizes the components of net periodic pension and OPEB expense along with the assumptions used to determine benefit obligations (dollars in millions):
		Year Ended December 31, 2014														Year Ended December 31, 2013												Year Ended December 31, 2012
		Pension Benefits								Other Benefits						Pension Benefits						Other Benefits						Pension Benefits						Other Benefits
		U.S. Plans				Non-U.S. Plans				U.S. Plans			Non-U.S. Plans			U.S. Plans			Non-U.S. Plans			U.S. Plans			Non-U.S. Plans			U.S. Plans			Non-U.S. Plans			U.S. Plans			Non-U.S. Plans
	Components of expense
	Service cost	$	380			$	389			$	13		$	10		$	395		$	425		$	24		$	13		$	590		$	411		$	23		$	16
	Interest cost	3,060				1,031				218			55			2,837			1,010			217			57			4,055			1,110			234			63
	Expected return on plan assets	(3,914		)		(873		)		—			—			(3,562		)	(823		)	—			—			(5,029		)	(870		)	—			—
	Amortization of prior service cost (credit)	(4		)		17				(2		)	(14		)	(4		)	19			(116		)	(14		)	(1		)	1			(116		)	(12		)
	Recognized net actuarial loss	(91		)		154				14			(6		)	6			208			85			6			2			35			52			6
	Curtailments, settlements and other	(1		)		3				—			—			(77		)	(6		)	(62		)	—			2,580			71			—			11
	Net periodic expense (income)	$	(570	)		$	721			$	243		$	45		$	(405	)	$	833		$	148		$	62		$	2,197		$	758		$	193		$	84
	Weighted-average assumptions used to determine benefit obligations
	Discount rate	3.73		%		3.14		%		3.8		%	3.99		%	4.46		%	4.1		%	4.52		%	4.71		%	3.59		%	3.7		%	3.68		%	3.97		%
	Rate of compensation increase(a)	N/A				2.85		%		N/A			4.21		%	N/A			2.9		%	N/A			4.21		%	N/A			2.77		%	4.5		%	4.21		%
	Weighted-average assumptions used to determine net expense
	Discount rate	4.46		%		4.1		%		4.52		%	4.71		%	3.59		%	3.69		%	3.69		%	3.97		%	4.06		%	4.45		%	4.24		%	4.31		%
	Expected rate of return on plan assets	6.53		%		6.28		%		N/A			N/A			5.77		%	5.7		%	N/A			N/A			6.18		%	6.2		%	N/A			N/A
	Rate of compensation increase(a)	N/A				2.9		%		N/A			4.21		%	N/A			2.77		%	4.5		%	4.21		%	4.5		%	3.15		%	4.5		%	4.21		%
	_________
	(a)	As a result of ceasing the accrual of additional benefits for salaried plan participants, the rate of compensation increase does not have a significant effect on our U.S. pension and OPEB plans.
Schedule of Expected Benefit Payments [Table Text Block]	The following table summarizes net benefit payments expected to be paid in the future, which include assumptions related to estimated future employee service (dollars in millions):
		Pension Benefits(a)								Other Benefits
		U.S. Plans				Non-U.S. Plans				U.S. Plans			Non-U.S. Plans
	2015	$	5,616			$	1,530			$	344		$	59
	2016	$	5,572			$	1,570			$	331		$	63
	2017	$	5,380			$	1,558			$	322		$	61
	2018	$	5,239			$	1,458			$	313		$	63
	2019	$	5,128			$	1,448			$	307		$	65
	2020 - 2024	$	23,754			$	7,136			$	1,470		$	348
	__________
	(a)	Benefits for most U.S. pension plans and certain non-U.S. pension plans are paid out of plan assets rather than our Cash and cash equivalents.
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule of contributions to employee benefit plans	The following table summarizes contributions made to the defined benefit pension plans (dollars in millions):
		Years Ended December 31,
		2014				2013				2012
	U.S. hourly and salaried	$	143			$	128			$	2,420
	Non-U.S.	770				886				855
	Total	$	913			$	1,014			$	3,275
Schedules of Fair Value of Plan Assets by Asset Class and Target Allocations [Table Text Block]	The following table summarizes the target allocations by asset category for U.S. and non-U.S. defined benefit pension plans:
		December 31, 2014						December 31, 2013
		U.S. Plans			Non-U.S. Plans			U.S. Plans			Non-U.S. Plans
	Equity	16	%		27	%		19	%		28	%
	Debt	60	%		47	%		58	%		49	%
	Other(a)	24	%		26	%		23	%		23	%
	Total	100	%		100	%		100	%		100	%
	__________
	(a)	Primarily includes private equity, real estate and absolute return strategies which mainly consist of hedge funds.
	Assets and Fair Value Measurements
	The following tables summarize the fair value of U.S. defined benefit pension plan assets by asset class (dollars in millions):
		31-Dec-14														31-Dec-13
		Level 1				Level 2				Level 3			Total			Level 1			Level 2			Level 3			Total
	Assets
	Cash equivalents and other short-term investments	$	—			$	42			$	—		$	42		$	—		$	411		$	—		$	411
	Common and preferred stocks	10,033				30				3			10,066			10,234			70			6			10,310
	Government and agency debt securities(a)	—				16,143				—			16,143			—			14,971			—			14,971
	Corporate and other debt securities(b)	—				22,725				83			22,808			—			20,647			130			20,777
	Investment funds(c)	70				910				5,221			6,201			99			1,018			5,174			6,291
	Private equity and debt investments(d)	—				—				5,909			5,909			—			—			6,335			6,335
	Real estate investments(e)	560				2				3,608			4,170			390			4			4,127			4,521
	Other investments	—				—				65			65			—			—			62			62
	Derivative assets	55				313				1			369			17			157			—			174
	Total assets	10,718				40,165				14,890			65,773			10,740			37,278			15,834			63,852
	Liabilities
	Derivative liabilities	(23		)		(496		)		—			(519		)	(22		)	(311		)	(6		)	(339		)
	Net plan assets subject to leveling	$	10,695			$	39,669			$	14,890		65,254			$	10,718		$	36,967		$	15,828		63,513
	Other plan assets and liabilities(f)												569												653
	Net Plan Assets												$	65,823											$	64,166
	The following tables summarize the fair value of non-U.S. defined benefit pension plan assets by asset class (dollars in millions):
		31-Dec-14														31-Dec-13
		Level 1				Level 2				Level 3			Total			Level 1			Level 2			Level 3			Total
	Assets
	Cash equivalents and other short-term investments	$	—			$	207			$	—		$	207		$	—		$	156		$	—		$	156
	Common and preferred stocks	1,959				3				—			1,962			1,816			6			—			1,822
	Government and agency debt securities(a)	—				3,614				—			3,614			—			3,418			—			3,418
	Corporate and other debt securities(b)	—				1,986				—			1,986			—			2,475			14			2,489
	Investment funds(c)	101				3,409				889			4,399			128			3,529			745			4,402
	Private equity and debt investments(d)	—				—				509			509			—			—			430			430
	Real estate investments(e)	20				4				1,263			1,287			13			12			1,405			1,430
	Other investments	—				—				722			722			—			—			618			618
	Derivative assets	17				24				—			41			3			44			—			47
	Total assets	2,097				9,247				3,383			14,727			1,960			9,640			3,212			14,812
	Liabilities
	Derivative liabilities	—				(44		)		—			(44		)	(12		)	(56		)	—			(68		)
	Net plan assets subject to leveling	$	2,097			$	9,203			$	3,383		14,683			$	1,948		$	9,584		$	3,212		14,744
	Other plan assets and liabilities(f)												(14		)										242
	Net Plan Assets												$	14,669											$	14,986
	__________
	(a)	Includes U.S. and sovereign government and agency issues.
	(b)	Includes mortgage and asset-backed securities.
	(c)	U.S. and non-U.S. Level 3 assets consist primarily of funds of hedge funds. Non-U.S. Level 2 assets consist primarily of equity and fixed income funds.
	(d)	Includes private equity investment funds.
	(e)	Includes investment funds and public real estate investment trusts.
	(f)	Cash held by the plans, net of amounts receivable/payable for unsettled security transactions and payables for investment manager fees, custody fees and other expenses.
Schedules of U.S. and Non-US Pension Level 3 Plan Assets Rollforward [Table Text Block]	The following tables summarize the activity for U.S. defined benefit pension plan net assets measured at fair value using Level 3 inputs (dollars in millions):
		Balance at January 1, 2014				Net Realized/Unrealized				Purchases, Sales and			Transfers Into/Out of Level 3			Balance at December 31, 2014			Change in Unrealized Gains/(Losses) Attributable to Assets Held at
						Gains (Losses)				Settlements, Net									31-Dec-14
	Common and preferred stocks	$	6			$	2			$	(5	)	$	—		$	3		$	—
	Corporate and other debt securities	130				—				(41		)	(6		)	83			(4		)
	Investment funds	5,174				231				(184		)	—			5,221			208
	Private equity and debt investments	6,335				651				(1,077		)	—			5,909			27
	Real estate investments	4,127				251				(770		)	—			3,608			68
	Other investments	62				5				(2		)	—			65			5
	Derivatives, net	(6		)		(4		)		11			—			1			—
	Total net assets	$	15,828			$	1,136			$	(2,068	)	$	(6	)	$	14,890		$	304
		Balance at January 1, 2013				Net Realized/Unrealized				Purchases, Sales and			Transfers Into/Out of Level 3			Balance at December 31, 2013			Change in Unrealized Gains/(Losses) Attributable to Assets Held at
						Gains (Losses)				Settlements, Net									31-Dec-13
	Common and preferred stocks	$	19			$	3			$	(16	)	$	—		$	6		$	1
	Corporate and other debt securities	182				6				(58		)	—			130			(3		)
	Investment funds	4,959				552				(337		)	—			5,174			537
	Private equity and debt investments	6,400				926				(991		)	—			6,335			436
	Real estate investments	4,335				458				(666		)	—			4,127			190
	Other investments	63				(2		)		1			—			62			(2		)
	Derivatives, net	(8		)		2				—			—			(6		)	1
	Total net assets	$	15,950			$	1,945			$	(2,067	)	$	—		$	15,828		$	1,160
	The following tables summarize the activity for non-U.S. defined benefit pension plan assets measured at fair value using Level 3 inputs (dollars in millions):
		Balance at January 1, 2014				Net Realized/Unrealized				Purchases, Sales and			Transfers Into/Out of Level 3			Effect of Foreign Currency			Balance at December 31, 2014			Change in Unrealized Gains/(Losses) Attributable to Assets Held at
						Gains (Losses)				Settlements, Net												31-Dec-14
	Corporate and other debt securities	$	14			$	—			$	(13	)	$	—		$	(1	)	$	—		$	—
	Investment funds	745				103				111			—			(70		)	889			103
	Private equity and debt investments	430				100				20			—			(41		)	509			75
	Real estate investments	1,405				48				(84		)	—			(106		)	1,263			44
	Other investments	618				92				72			—			(60		)	722			76
	Total assets	$	3,212			$	343			$	106		$	—		$	(278	)	$	3,383		$	298
		Balance at January 1, 2013				Net Realized/Unrealized				Purchases, Sales and			Transfers Into/Out of Level 3			Effect of Foreign Currency			Balance at December 31, 2013			Change in Unrealized Gains/(Losses) Attributable to Assets Held at
						Gains (Losses)				Settlements, Net												31-Dec-13
	Corporate and other debt securities	$	5			$	1			$	7		$	1		$	—		$	14		$	1
	Investment funds	641				110				27			—			(33		)	745			112
	Private equity and debt investments	381				73				3			—			(27		)	430			53
	Real estate investments	1,422				103				(57		)	—			(63		)	1,405			122
	Other investments	665				(10		)		(43		)	—			6			618			4
	Total assets	$	3,114			$	277			$	(63	)	$	1		$	(117	)	$	3,212		$	292
OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule of contributions to employee benefit plans	The following table summarizes contributions to the U.S. OPEB plans (dollars in millions):
		Years Ended December 31,
		2014				2013				2012
	Employer contributions	$	354			$	393			$	432
	Plan participants' contributions	22				29				4
	Total contributions	$	376			$	422			$	436

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Schedule of Guarantor Obligations [Table Text Block]	The following tables summarize information related to commitments and contingencies (dollars in millions):
		December 31, 2014						December 31, 2013
		Liability Recorded			Maximum Liability(a)			Liability Recorded			Maximum Liability(a)
	Guarantees
	Third-party commercial loans and other obligations(b)	$	37		$	197		$	51		$	15,616
	Other product-related claims	$	51		$	2,458		$	54		$	1,317
	__________
	(a)	Calculated as future undiscounted payments.
	(b)	Includes liabilities recorded of $10 million and maximum liabilities of $15.3 billion related to Ally Financial repurchase obligations at December 31, 2013.
Commitment and Contingencies [Table Text Block]
		Liability Recorded
		December 31, 2014			December 31, 2013
	Other litigation-related liability and tax administrative matters	$	1,000		$	1,227
	Product liability	$	732		$	690
	Ignition switch recall compensation program	$	315
	Credit card programs(a)
	Redemption liability(b)	$	87		$	183
	Deferred revenue(c)	$	263		$	295
	Environmental liability	$	133		$	154
	Asset retirement obligations	$	146		$	159
	__________
	(a)	Credit card programs offer rebates that can be applied primarily against the purchase or lease of our vehicles. At December 31, 2014 and 2013 qualified cardholders had rebates available, net of deferred program revenue, of approximately $2.3 billion and $2.6 billion.
	(b)	Recorded in Accrued liabilities.
	(c)	Recorded in Other liabilities.
Schedule of Future Minimum Commitments for Operating Leases [Table Text Block]	The following table summarizes our minimum commitments under noncancelable operating leases having initial terms in excess of one year, primarily for property (dollars in millions):
		2015			2016			2017			2018			2019			Thereafter
	Minimum commitments(a)	$	348		$	280		$	196		$	171		$	144		$	396
	Sublease income	(53		)	(62		)	(59		)	(56		)	(54		)	(248		)
	Net minimum commitments	$	295		$	218		$	137		$	115		$	90		$	148
	__________
	(a)	Certain of the leases contain escalation clauses and renewal or purchase options.

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Schedule of Income before Income Tax and Equity Income [Table Text Block]	The following table summarizes income (loss) before income taxes and equity income (dollars in millions):
		Years Ended December 31,
		2014			2013			2012
	U.S. income (loss)	$	1,683		$	4,880		$	(19,063	)
	Non-U.S. income (loss)	469			768			(11,194		)
	Income (loss) before income taxes and equity income	$	2,152		$	5,648		$	(30,257	)
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	The following table summarizes Income tax expense (benefit) (dollars in millions):
		Years Ended December 31,
		2014			2013			2012
	Current income tax expense (benefit)
	U.S. federal	$	(23	)	$	(34	)	$	6
	U.S. state and local	154			88			78
	Non-U.S.	671			512			646
	Total current income tax expense	802			566			730
	Deferred income tax expense (benefit)
	U.S. federal	(581		)	1,049			(28,965		)
	U.S. state and local	(60		)	137			(3,415		)
	Non-U.S.	67			375			(3,181		)
	Total deferred income tax expense (benefit)	(574		)	1,561			(35,561		)
	Total income tax expense (benefit)	$	228		$	2,127		$	(34,831	)
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	The following table summarizes a reconciliation of Income tax expense (benefit) compared with the amounts at the U.S. federal statutory income tax rate (dollars in millions):
		Years Ended December 31,
		2014			2013			2012
	Income tax expense (benefit) at U.S. federal statutory income tax rate	$	753		$	1,977		$	(10,590	)
	State and local tax expense	73			145			254
	Non-U.S. income taxed at other than 35%	(72		)	(168		)	908
	Foreign tax credit election change	—			—			(1,075		)
	U.S. tax on Non-U.S. income	(8		)	543			713
	Change in valuation allowance	(402		)	182			(33,917		)
	Change in tax laws	602			146			67
	Research incentives	(279		)	(490		)	(68		)
	Goodwill impairment	41			124			8,705
	Settlements of prior year tax matters	(275		)	(473		)	—
	Realization of basis differences in affiliates	(256		)	—			—
	Foreign currency remeasurement	124			(21		)	(36		)
	U.S. salaried pension plan settlement	—			—			541
	Other adjustments	(73		)	162			(333		)
	Total income tax expense (benefit)	$	228		$	2,127		$	(34,831	)
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	The following table summarizes the components of temporary differences and carryforwards that give rise to deferred tax assets and liabilities (dollars in millions):
		December 31, 2014			December 31, 2013
	Deferred tax assets
	Postretirement benefits other than pensions	$	2,958		$	2,902
	Pension and other employee benefit plans	7,503			5,469
	Warranties, dealer and customer allowances, claims and discounts	5,512			4,282
	Property, plants and equipment	2,323			2,464
	Capitalized research expenditures	8,588			7,179
	Operating loss and tax credit carryforwards(a)	14,136			19,342
	Miscellaneous	3,286			1,663
	Total deferred tax assets before valuation allowances	44,306			43,301
	Less: valuation allowances	(9,659		)	(10,823		)
	Total deferred tax assets	34,647			32,478
	Deferred tax liabilities
	Intangible assets	416			397
	Net deferred tax assets	$	34,231		$	32,081
	_________
	(a)	Includes operating loss and tax credit carryforwards of $8.9 billion expiring through 2034 and $5.2 billion that may be carried forward indefinitely at December 31, 2014.
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]	The following table summarizes activity of the total amounts of unrecognized tax benefits (dollars in millions):
		Years Ended December 31,
		2014			2013			2012
	Beginning balance	$	2,530		$	2,745		$	2,370
	Additions to current year tax positions	184			251			112
	Additions to prior years' tax positions	149			276			512
	Reductions to prior years' tax positions	(603		)	(535		)	(141		)
	Reductions in tax positions due to lapse of statutory limitations	(164		)	(73		)	(34		)
	Settlements	(138		)	(132		)	(112		)
	Other	(81		)	(2		)	38
	Ending balance	$	1,877		$	2,530		$	2,745

Restructuring_And_Other_Initia1

Restructuring And Other Initiatives (Tables)	12 Months Ended
	Dec. 31, 2014
Restructuring and Related Activities [Abstract]
Schedule of Restructuring and Related Costs [Table Text Block]	The following table summarizes the reserves related to restructuring and other initiatives and charges by segment, including postemployment benefit reserves and charges (dollars in millions):
		GMNA			GME			GMIO			GMSA			Total
	Balance at January 1, 2012	$	884		$	687		$	1		$	12		$	1,584
	Additions, interest accretion and other	140			254			84			92			570
	Payments	(304		)	(344		)	(46		)	(55		)	(749		)
	Revisions to estimates and effect of foreign currency	(67		)	(7		)	—			(11		)	(85		)
	Balance at December 31, 2012(a)	653			590			39			38			1,320
	Additions, interest accretion and other	58			202			404			50			714
	Payments	(182		)	(299		)	(111		)	(68		)	(660		)
	Revisions to estimates and effect of foreign currency	(32		)	10			1			(4		)	(25		)
	Balance at December 31, 2013(a)	497			503			333			16			1,349
	Additions, interest accretion and other	42			675			213			83			1,013
	Payments	(96		)	(329		)	(342		)	(95		)	(862		)
	Revisions to estimates and effect of foreign currency	16			(98		)	(38		)	(2		)	(122		)
	Balance at December 31, 2014(a)	$	459		$	751		$	166		$	2		$	1,378
	__________
	(a)	The remaining cash payments related to these reserves for restructuring and other initiatives, including temporary layoff benefits of $354 million, $353 million and $356 million at December 31, 2014, 2013 and 2012 for GMNA, primarily relate to postemployment benefits to be paid.

Interest_Income_and_Other_NonO1

Interest Income and Other Non-Operating Income, net (Tables)	12 Months Ended
	Dec. 31, 2014
Interest and Other Income [Abstract]
Interest and Other Income [Table Text Block]	The following table summarizes the components of Interest income and other non-operating income, net (dollars in millions):
		Years Ended December 31,
		2014		2013			2012
	Interest income	$	211	$	246		$	343
	Net gains (losses) on derivatives	48		(13		)	(63		)
	Dividends and royalties	101		97			98
	Foreign currency transaction and remeasurement gains (losses)	378		(154		)	16
	Gains (losses) on securities and other investments - realized and unrealized	13		691			(193		)
	Deferred income from technology agreements	—		100			114
	Other	72		96			530
	Total interest income and other non-operating income, net	$	823	$	1,063		$	845

Stockholders_Equity_and_Noncon1

Stockholders' Equity and Noncontrolling Interests (Tables)	12 Months Ended
	Dec. 31, 2014
Stockholders' Equity Note [Abstract]
Schedule of Stock by Class [Table Text Block]	The following table summarizes significant features relating to our preferred and common stock (dollars in millions, except for per share amounts):
		Liquidation Preference Per Share			Dividend Per Annum			Dividends Paid
								Years Ended December 31,
								2014			2013		2012
	Series A Preferred Stock	$	25		9		%	$	1,160		$	1,370	$	621
	Series B Preferred Stock	$	50		4.75		%				$	237	$	238
	Common stock	N/A			$	1.2		$	1,928		$	—	$	—
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The following table summarizes the components of Accumulated other comprehensive loss (dollars in millions):
		Years Ended December 31,
		2014			2013			2012
	Foreign Currency Translation Adjustments
	Balance at beginning of period	$	(614	)	$	101		$	215
	Other comprehensive loss	(477		)	(722		)	(103		)
	Tax expense (benefit)	(4		)	11			—
	Other comprehensive loss, net of tax	(473		)	(733		)	(103		)
	Other comprehensive income (loss) attributable to noncontrolling interests, net of tax	23			18			(11		)
	Balance at end of period	$	(1,064	)	$	(614	)	$	101
	Unrealized Gains and Losses on Securities, Net
	Balance at beginning of period	$	2		$	41		$	(4	)
	Other comprehensive income (loss) before reclassification adjustment	(2		)	133			(140		)
	Tax expense (benefit)	(1		)	(6		)	22
	Other comprehensive income (loss) before reclassification adjustment, net of tax	(1		)	139			(162		)
	Reclassification adjustment	(7		)	(185		)	202
	Tax benefit	(3		)	(7		)	(5		)
	Reclassification adjustment, net of tax	(4		)	(178		)	207
	Other comprehensive income (loss), net of tax	(5		)	(39		)	45
	Balance at end of period	$	(3	)	$	2		$	41
	Defined Benefit Plans, Net
	Balance at beginning of period	$	(2,501	)	$	(8,194	)	$	(6,074	)
	Other comprehensive income (loss) before reclassification adjustment - prior service cost or credit	(20		)	6			(53		)
	Other comprehensive income (loss) before reclassification adjustment - actuarial gains or losses	(6,457		)	8,673			(3,180		)
	Tax expense (benefit)	(1,854		)	3,087			(1,021		)
	Other comprehensive income (loss) before reclassification adjustment, net of tax	(4,623		)	5,592			(2,212		)
	Reclassification adjustment - prior service cost or credit(a)	22			(128		)	(125		)
	Reclassification adjustment - actuarial gains or losses(a)	76			178			229
	Tax expense (benefit)(a)	(20		)	(51		)	12
	Reclassification adjustment, net of tax(a)	118			101			92
	Other comprehensive income (loss), net of tax	(4,505		)	5,693			(2,120		)
	Balance at end of period	$	(7,006	)	$	(2,501	)	$	(8,194	)
	__________
	(a)	Included in the computation of net periodic pension and OPEB (income) expense. Refer to Note 15 for additional information.

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	The following table summarizes basic and diluted earnings per share (in millions, except for per share amounts):
		Years Ended December 31,
		2014			2013			2012
	Basic earnings per share
	Net income attributable to stockholders	$	3,949		$	5,346		$	6,188
	Less: cumulative dividends on preferred stock and charge related to redemption and purchase of preferred stock(a)	(1,145		)	(1,576		)	(859		)
	Less: undistributed earnings allocated to Series B Preferred Stock participating security				—			(470		)
	Net income attributable to common stockholders	$	2,804		$	3,770		$	4,859
	Weighted-average common shares outstanding - basic	1,605			1,393			1,566
	Basic earnings per common share	$	1.75		$	2.71		$	3.1
	Diluted earnings per share
	Net income attributable to stockholders	$	3,949		$	5,346		$	6,188
	Add: preferred dividends to holders of Series B Preferred Stock				218			—
	Less: cumulative dividends on preferred stock and charge related to redemption and purchase of preferred stock(a)	(1,145		)	(1,576		)	(859		)
	Less: undistributed earnings allocated to Series B Preferred Stock participating security				—			(442		)
	Less: earnings adjustment for dilutive stock compensation	(18		)
	Net income attributable to common stockholders	$	2,786		$	3,988		$	4,887
	Weighted-average common shares outstanding - diluted
	Weighted-average common shares outstanding - basic	1,605			1,393			1,566
	Dilutive effect of warrants and RSUs	82			149			109
	Dilutive effect of conversion of Series B Preferred Stock				134			—
	Weighted-average common shares outstanding - diluted	1,687			1,676			1,675
	Diluted earnings per common share	$	1.65		$	2.38		$	2.92
	__________
	(a)	Includes earned but undeclared dividends of $15 million and $26 million on our Series A Preferred Stock in the years ended December 31, 2013 and 2012 and $20 million on our Series B Preferred Stock in the year ended December 31, 2012.

Stock_Incentive_Plans_Tables

Stock Incentive Plans (Tables)	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-based Compensation Activity [Table Text Block]	The following table summarizes information about the RSUs and PSUs under our stock incentive plans (units in millions):
		Shares		Weighted-Average Grant Date Fair Value			Weighted-Average Remaining Contractual Term in Years
	Units outstanding at January 1, 2014	18.6		$	27.76		1.2
	Granted	12.1		$	35.31
	Settled	(9.3	)	$	27.85
	Forfeited or expired	(1.5	)	$	30.39
	Units outstanding at December 31, 2014	19.9		$	32.11		1.3
	Units unvested and expected to vest at December 31, 2014	12.7		$	32.91		1.5
	Units vested and payable at December 31, 2014	6.7		$	30.49
	Units granted in the year ended December 31, 2013			$	29.05
	Units granted in the year ended December 31, 2012			$	25.1
Schedule of Compensation Cost for Stock Incentive Plans [Table Text Block]	The following table summarizes compensation expense recorded for our stock incentive plans (dollars in millions):
		Years Ended December 31,
		2014			2013			2012
	Compensation expense	$	245		$	311		$	302
	Income tax benefit	$	81		$	100		$	100

Supplementary_Quarterly_Financ1

Supplementary Quarterly Financial Information (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information [Table Text Block]	The following tables summarize supplementary quarterly financial information (dollars in millions, except per share amounts):
		1st Quarter		2nd Quarter		3rd Quarter		4th Quarter
	2014
	Total net sales and revenue	$	37,408	$	39,649	$	39,255	$	39,617
	Automotive gross margin	$	2,188	$	2,611	$	3,945	$	4,266
	Net income	$	280	$	287	$	1,442	$	2,009
	Net income attributable to stockholders	$	213	$	278	$	1,471	$	1,987
	Earnings per share, basic	$	0.08	$	0.12	$	0.86	$	0.69
	Earnings per share, diluted	$	0.06	$	0.11	$	0.81	$	0.66
		1st Quarter		2nd Quarter		3rd Quarter		4th Quarter
	2013
	Total net sales and revenue	$	36,884	$	39,075	$	38,983	$	40,485
	Automotive gross margin	$	3,727	$	4,416	$	4,954	$	4,070
	Net income	$	1,185	$	1,388	$	1,705	$	1,053
	Net income attributable to stockholders	$	1,175	$	1,414	$	1,717	$	1,040
	Earnings per share, basic	$	0.63	$	0.87	$	0.5	$	0.64
	Earnings per share, diluted	$	0.58	$	0.75	$	0.45	$	0.57

Segment_Reporting_Tables

Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment [Table Text Block]	The following tables summarize key financial information by segment (dollars in millions):
		At and For the Year Ended December 31, 2014
		GMNA			GME			GMIO			GMSA			Corporate			Eliminations			Total Automotive			GM Financial			Eliminations			Total
	Sales
	External customers	$	101,199		$	22,235		$	14,392		$	13,115		$	151					$	151,092		$	—		$	—		$	151,092
	GM Financial revenue	—			—			—			—			—						—			4,854			(17		)	4,837
	Total net sales and revenue	$	101,199		$	22,235		$	14,392		$	13,115		$	151					$	151,092		$	4,854		$	(17	)	$	155,929
	Income (loss) before interest and taxes-adjusted	$	6,603		$	(1,369	)	$	1,222		$	(180	)	$	(580	)				$	5,696		$	803		$	(5	)	$	6,494
	Adjustments(a)	$	(975	)	$	(245	)	$	(180	)	$	(539	)	$	(400	)				$	(2,339	)	$	12		$	—		(2,327		)
	Automotive interest income																												211
	Automotive interest expense																												(403		)
	Gain on extinguishment of debt																												202
	Net income attributable to noncontrolling interests																												69
	Income before income taxes																												$	4,246
	Equity in net assets of nonconsolidated affiliates	$	88		$	6		$	8,254		$	2		$	—		$	—		$	8,350		$	—		$	—		$	8,350
	Total assets	$	92,864		$	10,528		$	22,949		$	10,066		$	24,368		$	(29,041	)	$	131,734		$	47,861		$	(1,918	)	$	177,677
	Expenditures for property	$	4,985		$	887		$	681		$	359		$	127		$	—		$	7,039		$	52		$	—		$	7,091
	Depreciation, amortization and impairment of long-lived assets and finite-lived intangible assets	$	4,376		$	627		$	740		$	386		$	75		$	(4	)	$	6,200		$	918		$	—		$	7,118
	Equity income (loss)	$	19		$	(45	)	$	2,120		$	—		$	—		$	—		$	2,094		$	—		$	—		$	2,094
	__________
	(a)	Consists of a catch-up adjustment related to the change in estimate for recall campaigns of $874 million and charges related to flood damage, net of insurance recoveries, of $101 million in GMNA; asset impairment charges of $245 million related to our Russian subsidiaries in GME; asset impairment charges of $158 million related to our Thailand subsidiary in GMIO; Venezuela currency devaluation charges of $419 million and Goodwill impairment charges of $120 million in GMSA; a charge related to the ignition switch recall compensation program of $400 million in Corporate; and other of $10 million.
		At and For the Year Ended December 31, 2013
		GMNA			GME			GMIO			GMSA			Corporate			Eliminations			Total Automotive			GM Financial			Eliminations			Total
	Sales
	External customers	$	95,091		$	21,962		$	18,411		$	16,478		$	150					$	152,092		$	—		$	—		$	152,092
	GM Financial revenue	—			—			—			—			—						—			3,344			(9		)	3,335
	Intersegment	8			—			—			—			—						8			—			(8		)	—
	Total net sales and revenue	$	95,099		$	21,962		$	18,411		$	16,478		$	150					$	152,100		$	3,344		$	(17	)	$	155,427
	Income (loss) before interest and taxes-adjusted	$	7,461		$	(869	)	$	1,255		$	327		$	(494	)				$	7,680		$	898		$	—		$	8,578
	Adjustments(a)	$	(100	)	$	153		$	(1,169	)	$	(157	)	$	483					$	(790	)	$	(15	)	$	—		(805		)
	Automotive interest income																												246
	Automotive interest expense																												(334		)
	Loss on extinguishment of debt																												(212		)
	Net loss attributable to noncontrolling interests																												(15		)
	Income before income taxes																												$	7,458
	Equity in net assets of nonconsolidated affiliates	$	74		$	95		$	7,921		$	4		$	—		$	—		$	8,094		$	—		$	—		$	8,094
	Total assets	$	87,978		$	11,276		$	22,100		$	11,488		$	26,460		$	(29,252	)	$	130,050		$	38,084		$	(1,790	)	$	166,344
	Expenditures for property	$	5,466		$	818		$	724		$	444		$	92		$	5		$	7,549		$	16		$	—		$	7,565
	Depreciation, amortization and impairment of long-lived assets and finite-lived intangible assets	$	4,216		$	426		$	1,786		$	522		$	63		$	(1	)	$	7,012		$	498		$	(10	)	$	7,500
	Equity income	$	15		$	34		$	1,760		$	1		$	—		$	—		$	1,810		$	—		$	—		$	1,810
	__________
	(a)	Consists of pension settlement charges of $56 million and charges related to PSA product development agreement of $49 million in GMNA; gain on sale of equity investment in PSA of $152 million in GME; property and intangible asset impairment charges of $774 million, costs related to the withdrawal of the Chevrolet brand in Europe of $621 million and goodwill impairment charges of $442 million, partially offset by GM Korea hourly wage litigation of $577 million and acquisition of GM Korea preferred shares of $67 million in GMIO, all net of noncontrolling interests; Venezuela currency devaluation charges of $162 million in GMSA; gain on sale of equity investment in Ally Financial of $483 million in Corporate; costs related to the withdrawal of the Chevrolet brand in Europe of $15 million in GM Financial; and income related to various insurance recoveries of $35 million.
		At and For the Year Ended December 31, 2012
		GMNA			GME			GMIO			GMSA			Corporate			Eliminations			Total Automotive			GM Financial			Eliminations			Total
	Sales
	External customers	$	89,912		$	23,055		$	20,588		$	16,700		$	40					$	150,295		$	—		$	—		$	150,295
	GM Financial revenue	—			—			—			—			—						—			1,961			—			1,961
	Intersegment	(2		)	—			—			—			—						(2		)	—			2			—
	Total net sales and revenue	$	89,910		$	23,055		$	20,588		$	16,700		$	40					$	150,293		$	1,961		$	2		$	152,256
	Income (loss) before interest and taxes-adjusted	$	6,470		$	(1,949	)	$	2,538		$	457		$	(400	)				$	7,116		$	744		$	(1	)	$	7,859
	Adjustments(a)	$	(29,052	)	$	(6,389	)	$	(290	)	$	27		$	(402	)				$	(36,106	)	$	—		$	—		(36,106		)
	Automotive interest income																												343
	Automotive interest expense																												(489		)
	Loss on extinguishment of debt																												(250		)
	Net loss attributable to noncontrolling interests																												(52		)
	Loss before income taxes																												$	(28,695	)
	Equity in net assets of nonconsolidated affiliates	$	65		$	159		$	6,656		$	3		$	—		$	—		$	6,883		$	—		$	—		$	6,883
	Total assets	$	87,100		$	10,475		$	24,147		$	11,958		$	16,991		$	(16,927	)	$	133,744		$	16,368		$	(690	)	$	149,422
	Expenditures for property	$	4,766		$	1,075		$	1,185		$	956		$	77		$	(4	)	$	8,055		$	13		$	—		$	8,068
	Depreciation, amortization and impairment of long-lived assets and finite-lived intangible assets	$	3,663		$	6,584		$	624		$	483		$	49		$	(1	)	$	11,402		$	225		$	(10	)	$	11,617
	Equity income	$	9		$	35		$	1,517		$	1		$	—		$	—		$	1,562		$	—		$	—		$	1,562
	Valuation allowances against deferred tax assets(b)	$	—		$	—		$	—		$	—		$	(36,261	)	$	—		$	(36,261	)	$	(103	)	$	—		$	(36,364	)
	__________
	(a)	Consists primarily of Goodwill impairment charges of $26.4 billion, pension settlement charges of $2.7 billion and income related to various insurance recoveries of $9 million in GMNA; property impairment charges of $3.7 billion, intangible assets impairment charges of $1.8 billion, goodwill impairment charges of $590 million, impairment charges related to investment in PSA of $220 million, a charge of $119 million to record General Motors Strasbourg S.A.S. assets and liabilities to estimated fair value and income related to various insurance recoveries of $9 million in GME; GM Korea hourly wage litigation charge of $336 million, goodwill impairment charges of $132 million, which are presented net of noncontrolling interests, income related to various insurance recoveries of $110 million and income related to redemption of the GM Korea mandatorily redeemable preferred shares of $68 million in GMIO; income related to various insurance recoveries of $27 million in GMSA; and a charge of $402 million which represents the premium paid to purchase our common stock from the UST in Corporate.
(b)	Includes valuation allowance releases of $36.5 billion net of the establishment of new valuation allowances of $0.1 billion. Amounts exclude changes related to income tax expense (benefits) in jurisdictions with a full valuation allowance throughout the period.
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]	The following table summarizes information concerning principal geographic areas (dollars in millions):
		At and For the Years Ended December 31,
		2014						2013						2012
		Net Sales & Revenue			Long-Lived Assets			Net Sales & Revenue			Long-Lived Assets			Net Sales & Revenue			Long-Lived Assets
	Automotive
	U.S.	$	93,559		$	18,813		$	88,784		$	15,844		$	85,105		$	13,520
	Non-U.S.	57,533			12,355			63,308			12,289			65,190			12,425
	GM Financial
	U.S.	2,549			5,477			2,233			2,472			1,832			1,112
	Non-U.S.	2,288			1,755			1,102			1,043			129			590
	Total consolidated	$	155,929		$	38,400		$	155,427		$	31,648		$	152,256		$	27,647

Supplemental_Information_for_t1

Supplemental Information for the Consolidated Statements of Cash Flows (Tables)	12 Months Ended
	Dec. 31, 2014
Supplemental Cash Flow Information [Abstract]
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]	The following table summarizes the sources (uses) of cash provided by Change in other operating assets and liabilities and cash paid for income taxes and interest (dollars in millions):
		Years Ended December 31,
		2014			2013			2012
	Accounts receivable	$	(1,248	)	$	8		$	(460	)
	Purchases of wholesale receivables, net	(2,000		)	—			—
	Inventories	(309		)	59			(326		)
	Automotive equipment on operating leases	(1,949		)	(968		)	370
	Change in other assets	(213		)	(563		)	(312		)
	Accounts payable	19			(485		)	162
	Income taxes payable	(145		)	(161		)	155
	Accrued liabilities and other liabilities	6,089			784			1,041
	Total	$	244		$	(1,326	)	$	630
	Cash paid for income taxes and interest
	Cash paid for income taxes	$	947		$	727		$	575
	Cash paid for interest (net of amounts capitalized) - Automotive	$	301		$	299		$	335
	Cash paid for interest (net of amounts capitalized) - GM Financial	1,120			760			298
	Total cash paid for interest (net of amounts capitalized)	$	1,421		$	1,059		$	633

Nature_Of_Operations_and_Basis2

Nature Of Operations and Basis of Presentation (Details) (USD $)	12 Months Ended			3 Months Ended	6 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014	Dec. 31, 2014
Vehicles recalled	42,000,000
Recall campaign and courtesy transportation charges	$2,910	$640	$775
Ignition Switch Recall Compensation Program [Member]
Charge related to ignition switch recall compensation program				400
GMNA [Member]
Vehicles recalled					8,100,000
GMNA [Member] | Warranty Obligations [Member]
Recall campaigns catch-up adjustment				874	200
GMNA [Member] | Warranty Obligations [Member] | Automotive Cost of Sales [Member]
Recall campaigns catch-up adjustment				$874

Significant_Accounting_Policie3

Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Equivalents [Abstract]
Maximum Maturity Days for Highly Liquid Securities	90 days
Pension and Other Postretirement Plans [Abstract]
Percentage Recognized as Pension Expense in the First Year	60.00%
Percentage of Pension Expense Recognized in the Next Four Years	10.00%
Period Of Time Over Which Pension Return Adjustment Is Amortized	4 years
Percentage of Non-US Pension Benefit Obligation Related to Canada, United Kingdom and Germany	92.00%
Income Taxes [Abstract]
Valuation Allowance Methodology Number Of Years Utilized	3 years
Minimum Percentage Threshold To Recognize The Tax Benefit For Uncertain Tax Positions	50.00%
Foreign Currency Transactions and Translation [Abstract]
Foreign currency transaction and remeasurement losses	$437,000,000	$350,000,000	$117,000,000
Vehicles [Member] | Maximum [Member]
Equipment on Operating Leases, net [Abstract]
Lease Term to Retail Customers	60 months
Lease Term to Rental Car Companies	8 months
GM Financial [Member] | Consumer Finance Receivable [Member]
Revenue Recognition [Abstract]
Days Past Due Threshold for Suspending Accrual of Finance Charge Income	60 days
Finance Receivables [Abstract]
Days Past Due Threshold for Charge Off of Finance Receivables	120 days
GM Financial [Member] | Commercial Finance Receivables [Member]
Revenue Recognition [Abstract]
Days Past Due Threshold for Suspending Accrual of Finance Charge Income	90 days
Automotive [Member]
Allowance for Doubtful Accounts [Roll Forward]
Balance at Beginning of Period	344,000,000	311,000,000	331,000,000
Amounts Charged (Credited) to Costs and Expenses	50,000,000	61,000,000	-10,000,000
Deductions	-8,000,000	-24,000,000	-46,000,000
Effect of foreign currency and other	-46,000,000	-4,000,000	36,000,000
Balance at End of Period	340,000,000	344,000,000	311,000,000
Automotive Selling, General and Administrative Expense [Member]
Advertising and Promotion Expenditures [Abstract]
Advertising and Promotion Expenditures	5,200,000,000	5,500,000,000	5,400,000,000
Automotive Cost of Sales [Member]
Research and Development Expenditures [Abstract]
Research and Development Expenditures	$7,400,000,000	$7,200,000,000	$7,400,000,000

Acquisition_of_Businesses_Aqui

Acquisition of Businesses Aquisition of Ally International Operations (Details) (USD $)	12 Months Ended	1 Months Ended
	Dec. 31, 2013	Jan. 31, 2015	Nov. 30, 2012	Jan. 02, 2015
Business Acquisition [Line Items]
Goodwill from business combinations	$154,000,000
Ally International Operations - SAIC-GMAC [Member] | Subsequent Event [Member]
Business Acquisition [Line Items]
Cumulative Indirect Percentage Ownership in SAIC-GMAC		45.00%
GM Financial [Member]
Business Acquisition [Line Items]
Goodwill from business combinations	144,000,000
GM Financial [Member] | Ally International Operations - Europe and Latin America [Member]
Business Acquisition [Line Items]
Percentage of Voting Interests Acquired			100.00%
Aggregate Consideration for Acquisitions	3,300,000,000
Goodwill from business combinations	144,000,000
Business Acquisition, Pro Forma Revenue	156,300,000,000
Business Acquisition, Pro Forma Net Income (Loss)	5,500,000,000
GM Financial [Member] | Ally International Operations - SAIC-GMAC [Member] | Subsequent Event [Member]
Business Acquisition [Line Items]
Percentage of Voting Interests Acquired				40.00%
Aggregate Consideration for Acquisitions		1,000,000,000
Percentage ownership sold		5.00%
Sales proceeds		120,000,000

Marketable_Securities_Marketab

Marketable Securities Marketable Securities (Details) (USD $)	1 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Nov. 30, 2013
Marketable Securities [Line Items]
Total Marketable securities	$8,972		$9,222
Total Cash and cash equivalents	20,021		18,954
Total Restricted Cash and Marketable Securities	2,076		2,273
Equity investment in Peugeot S.A. [Member]
Marketable Securities [Line Items]
Available-for-Sale Ownership Percent in investment in Peugeot S. A. (PSA)				7.00%
Proceeds from Sale of investment in Peugeot S. A. (PSA) Common Stock	339
Equity investment in Peugeot S.A. [Member] | Interest income and other non-operating income (loss), net [Member]
Marketable Securities [Line Items]
Gain on Sale of Investments	152
Other than Temporary Impairment Charge on Investment in PSA Common Stock		220
Cash And Cash Equivalents Line Item [Member]
Marketable Securities [Line Items]
Available-for-sale Securities, Amortized Cost	10,812		10,890
Available-for-sale Securities, Fair Value Disclosure	10,812		10,890
Trading Securities, Fair Value	25		431
Total Marketable securities	10,837		11,321
Cash, Cash Equivalents And Time Deposits	9,184		7,633
Cash And Cash Equivalents Line Item [Member] | Money Market Funds [Member]
Marketable Securities [Line Items]
Available-for-sale Securities, Amortized Cost	1,262		2,480
Cash And Cash Equivalents Line Item [Member] | Money Market Funds [Member] | Level 1 [Member]
Marketable Securities [Line Items]
Available-for-sale Securities, Fair Value Disclosure	1,262		2,480
Cash And Cash Equivalents Line Item [Member] | US Treasury and Government [Member]
Marketable Securities [Line Items]
Available-for-sale Securities, Amortized Cost	1,437		1,600
Cash And Cash Equivalents Line Item [Member] | US Treasury and Government [Member] | Level 2 [Member]
Marketable Securities [Line Items]
Available-for-sale Securities, Fair Value Disclosure	1,437		1,600
Cash And Cash Equivalents Line Item [Member] | Sovereign Debt
Marketable Securities [Line Items]
Available-for-sale Securities, Amortized Cost	515		774
Cash And Cash Equivalents Line Item [Member] | Sovereign Debt | Level 2 [Member]
Marketable Securities [Line Items]
Available-for-sale Securities, Fair Value Disclosure	515		774
Trading Securities, Fair Value	0		431
Cash And Cash Equivalents Line Item [Member] | Corporate Debt
Marketable Securities [Line Items]
Available-for-sale Securities, Amortized Cost	7,598		6,036
Cash And Cash Equivalents Line Item [Member] | Corporate Debt | Level 2 [Member]
Marketable Securities [Line Items]
Available-for-sale Securities, Fair Value Disclosure	7,598		6,036
Trading Securities, Fair Value	25		0
Marketable Securities [Member]
Marketable Securities [Line Items]
Available-for-sale Securities, Amortized Cost	7,232		7,957
Available-for-sale Securities, Fair Value Disclosure	7,235		7,955
Marketable Securities [Member] | US Treasury and Government [Member]
Marketable Securities [Line Items]
Available-for-sale Securities, Amortized Cost	5,343		5,957
Marketable Securities [Member] | US Treasury and Government [Member] | Level 2 [Member]
Marketable Securities [Line Items]
Available-for-sale Securities, Fair Value Disclosure	5,344		5,957
Marketable Securities [Member] | Sovereign Debt | Level 2 [Member]
Marketable Securities [Line Items]
Trading Securities, Fair Value	1,737		1,267
Marketable Securities [Member] | Corporate Debt
Marketable Securities [Line Items]
Available-for-sale Securities, Amortized Cost	1,889		2,000
Marketable Securities [Member] | Corporate Debt | Level 2 [Member]
Marketable Securities [Line Items]
Available-for-sale Securities, Fair Value Disclosure	1,891		1,998
Restricted cash and marketable securities [Member]
Marketable Securities [Line Items]
Available-for-sale Securities, Amortized Cost	931		1,426
Available-for-sale Securities, Fair Value Disclosure	932		1,427
Restricted cash and cash equivalents and time deposits	1,144		846
Restricted cash and marketable securities [Member] | Money Market Funds [Member]
Marketable Securities [Line Items]
Available-for-sale Securities, Amortized Cost	897		1,381
Restricted cash and marketable securities [Member] | Money Market Funds [Member] | Level 1 [Member]
Marketable Securities [Line Items]
Available-for-sale Securities, Fair Value Disclosure	897		1,381
Restricted cash and marketable securities [Member] | Other
Marketable Securities [Line Items]
Available-for-sale Securities, Amortized Cost	34		45
Restricted cash and marketable securities [Member] | Other | Level 2 [Member]
Marketable Securities [Line Items]
Available-for-sale Securities, Fair Value Disclosure	$35		$46

Marketable_Securities_Contract

Marketable Securities Contractual Maturity Table (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Proceeds from Sale and Maturity of Marketable Securities [Abstract]
Available-for-sale securities, sale proceeds	$5,900,000,000	$4,700,000,000	$4,700,000,000
Available-for-Sale Securities Classified by Contractual Maturity, Amortized Cost
Due in one year or less, amortized cost	14,461,000,000
Due after one year through five years, amortized cost	1,951,000,000
Total contractual maturities of available-for-sale securities, amortized cost	16,412,000,000
Available-for-Sale Securities Classified by Contractual Maturity, Fair Value [Abstract]
Due in one year or less, fair value	14,461,000,000
Due after one year through five years, fair value	1,950,000,000
Total available-for-sale securities with contractual maturities, fair value	$16,411,000,000

GM_Financial_Receivables_net_S

GM Financial Receivables, net Summary of Finance Receivables, Net (Details) (GM Financial [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Millions, unless otherwise specified
Finance Receivables [Line Items]
Pre-acquisition finance receivables, outstanding amount	$508	$1,294
Pre-acquisition finance receivables, carrying amount	459	1,174
Post-acquisition finance receivables, net of fees	32,770	28,006
Total Finance Receivables	33,229	29,180
Less: Allowance for Loan Losses	-695	-548	-351	-179
Total Finance Receivables, net	32,534	28,632
Finance Receivables, Fair Value	33,106	28,668
Allowance for Loan Losses - Current	529	427
Consumer Finance Receivable [Member]
Finance Receivables [Line Items]
Pre-acquisition finance receivables, outstanding amount	508	1,294
Pre-acquisition finance receivables, carrying amount	459	1,174
Post-acquisition finance receivables, net of fees	25,164	21,956
Total Finance Receivables	25,623	23,130
Less: Allowance for Loan Losses	-655	-497
Total Finance Receivables, net	24,968	22,633
Commercial Finance Receivables [Member]
Finance Receivables [Line Items]
Pre-acquisition finance receivables, outstanding amount	0	0
Pre-acquisition finance receivables, carrying amount	0	0
Post-acquisition finance receivables, net of fees	7,606	6,050
Total Finance Receivables	7,606	6,050
Less: Allowance for Loan Losses	-40	-51
Total Finance Receivables, net	$7,566	$5,999

GM_Financial_Receivables_net_A

GM Financial Receivables, net Allowance for Loan Losses (Details) (GM Financial [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
GM Financial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	$548	$351	$179
Provision for Loan Losses	604	475	304
Charge-offs	-914	-643	-304
Recoveries	470	362	172
Effect of foreign currency	-13	3	0
Balance at end of period	$695	$548	$351

GM_Financial_Receivables_net_C

GM Financial Receivables, net Consumer Finance Receivables Delinquencies and TDRs (Details) (GM Financial [Member], Consumer Finance Receivable [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
GM Financial [Member] | Consumer Finance Receivable [Member]
Delinquent Contracts [Abstract]
31 to 60 Days Past Due	$1,083	$952
Greater than 60 Days Past Due	432	408
Total Finance Receivables More Than 30 Days Delinquent	1,515	1,360
In Repossession	40	41
Total Finance Receivables More Than 30 Days Delinquent or in Repossession	1,555	1,401
31 To 60 Days Past Due, Percent Of Contractual Amount Due	4.20%	4.10%
Greater than 60 Days Past Due, Percent of Contractual Amount Due	1.70%	1.70%
Total Finance Receivables More than 30 Days Past Due, Percent of Contractual Amount Due	5.90%	5.80%
In Repossession, Percent of Contractual Amount Due	0.20%	0.20%
Total Finance Receivables More Than 30 Days Delinquent or in Repossession, Percent of Contractual Amount Due	6.10%	6.00%
Outstanding recorded investment	1,234	767
Less: allowance for loan losses	-172	-103
Outstanding recorded investment, net of allowance	1,062	664
Unpaid principal balance	$1,255	$779

GM_Financial_Receivables_net_C1

GM Financial Receivables, net Credit Quality Indicators (Details) (GM Financial [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Gross	$33,229	$29,180
Consumer Finance Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Consumer finance receivables, nonaccrual status	682	642
Financing Receivable, Gross	25,623	23,130
Consumer Finance Receivable [Member] | North America [Member]
Financing Receivable, Recorded Investment [Line Items]
FICO Score to Differentiate Sub-Prime from Prime Loans	620	620
Percentage of Sub-Prime Loans	83.00%	88.00%
Commercial Finance Receivables [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Gross	7,606	6,050
Commercial Finance Receivables [Member] | Group I Dealers [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Gross	1,050	549
Commercial Finance Receivables [Member] | Group II Dealers [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Gross	2,022	1,460
Commercial Finance Receivables [Member] | Group III Dealers [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Gross	2,599	1,982
Commercial Finance Receivables [Member] | Group IV Dealers [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Gross	1,173	1,462
Commercial Finance Receivables [Member] | Group V Dealers [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Gross	524	385
Commercial Finance Receivables [Member] | Group VI Dealers [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Gross	$238	$212

Inventories_Details

Inventories (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Inventory Disclosure [Abstract]
Productive material, supplies and work in process	$5,380	$5,872
Finished product, including service parts	8,262	8,167
Total inventories	$13,642	$14,039

Equipment_on_Operating_Leases_2

Equipment on Operating Leases, net (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property Subject to or Available for Operating Lease [Line Items]
Equipment on operating leases, net	$3,564	$2,398
GM Financial [Member]
Property Subject to or Available for Operating Lease [Line Items]
GM Financial equipment on operating leases, net	7,060	3,383
Vehicles [Member] | Automotive [Member]
Property Subject to or Available for Operating Lease [Line Items]
Equipment on operating leases	3,822	2,605
Less: accumulated depreciation	-258	-207
Equipment on operating leases, net	3,564	2,398
Depreciation expense	507	218	227
Impairment Charges	155	168	181
Vehicles [Member] | GM Financial [Member]
Property Subject to or Available for Operating Lease [Line Items]
Depreciation expense	868	450	205
GM Financial equipment on operating leases	8,268	4,025
Less: accumulated depreciation	-1,208	-642
GM Financial equipment on operating leases, net	7,060	3,383
Minimum rental receipts under operating leases [Abstract]
2015	1,241
2016	1,019
2017	597
2018	98
2019	$5

Equity_In_Net_Assets_Of_Noncon2

Equity In Net Assets Of Nonconsolidated Affiliates Equity in Net Assets of Nonconsolidated Affiliates (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 02, 2015
Schedule of Equity Method Investments [Line Items]
Equity income (loss)	$2,094,000,000	$1,810,000,000	$1,562,000,000
Dividends Received	1,800,000,000	1,700,000,000	1,400,000,000
Undistributed Earnings Including Dividends Declared	2,000,000,000	1,800,000,000
Equity Method Investments	8,350,000,000	8,094,000,000	6,883,000,000
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity	3,900,000,000	3,800,000,000
China JVs [Member]
Schedule of Equity Method Investments [Line Items]
Equity income (loss)	2,066,000,000	1,763,000,000	1,521,000,000
Equity Method Investments	8,140,000,000	7,851,000,000
SGM [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%	50.00%
SGM Norsom [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	25.00%	25.00%
SGM DY [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	25.00%	25.00%
SGM DYPT [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	25.00%	25.00%
SGMW [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	44.00%	44.00%
FAW-GM [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%	50.00%
PATAC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%	50.00%
Shanghai Onstar [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	40.00%	40.00%
Shanghai Chengxin [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	33.00%	33.00%
SGMS [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	49.00%	49.00%
Other Nonconsolidated Affiliates [Member]
Schedule of Equity Method Investments [Line Items]
Equity income (loss)	28,000,000	47,000,000	41,000,000
Equity Method Investments	$210,000,000	$243,000,000
SGM [Member] | SGM Norsom [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%
SGM [Member] | SGM DY [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%
SGM [Member] | SGM DYPT [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%
SGM [Member] | Shanghai Onstar [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	20.00%
SGM [Member] | Shanghai Chengxin [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	33.00%
SGM [Member] | SAIC-GMAC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	20.00%
SAIC [Member] | SGM [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%
SAIC [Member] | SGM Norsom [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	25.00%
SAIC [Member] | SGM DY [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	25.00%
SAIC [Member] | SGM DYPT [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	25.00%
SAIC [Member] | SGMS [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	51.00%
Ally Financial [Member] | SAIC-GMAC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	40.00%
SAICFC [Member] | SAIC-GMAC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	40.00%
Subsequent Event [Member] | SAICFC [Member] | SAIC-GMAC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage				45.00%
Subsequent Event [Member] | GM Financial [Member] | SAIC-GMAC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage				35.00%

Equity_In_Net_Assets_Of_Noncon3

Equity In Net Assets Of Nonconsolidated Affiliates Summarized Financial Data of NCAs (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
Current Assets	$18,078	$16,900
Noncurrent Assets	11,265	9,645
Total Assets	29,343	26,545
Current Liabilities	18,320	15,878
Noncurrent Liabilities	1,426	1,576
Total Liabilities	19,746	17,454
Non-controlling Interests	1,046	1,040
Net Sales	47,024	40,597	37,327
Net Income (Loss)	4,403	3,735	3,175
China JVs [Member]
Schedule of Equity Method Investments [Line Items]
Current Assets	15,442	14,666
Noncurrent Assets	9,758	8,187
Total Assets	25,200	22,853
Current Liabilities	16,141	14,019
Noncurrent Liabilities	931	1,065
Total Liabilities	17,072	15,084
Non-controlling Interests	1,043	1,040
Net Sales	43,853	38,767	33,364
Net Income (Loss)	4,312	3,685	3,198
Other Nonconsolidated Affiliates [Member]
Schedule of Equity Method Investments [Line Items]
Current Assets	2,636	2,234
Noncurrent Assets	1,507	1,458
Total Assets	4,143	3,692
Current Liabilities	2,179	1,859
Noncurrent Liabilities	495	511
Total Liabilities	2,674	2,370
Non-controlling Interests	3	0
Net Sales	3,171	1,830	3,963
Net Income (Loss)	$91	$50	($23)

Equity_In_Net_Assets_Of_Noncon4

Equity In Net Assets Of Nonconsolidated Affiliates Transactions with NCAs (Details) (Nonconsolidated Affiliates [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Nonconsolidated Affiliates [Member]
Related Party Transactions [Line Items]
Automotive sales and revenue	$2,762	$2,724	$2,572
Automotive purchases, net	311	724	497
Interest income and other non-operating income	23	19	184
Operating cash flows	4,321	3,607	3,385
Accounts and notes receivable, net	706	756
Accounts payable	$205	$183

Property_net_Details

Property, net (Details) (USD $)	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012
Property, Plant and Equipment, Net, by Type [Abstract]
Property, net	$27,743,000,000	$25,867,000,000
Capitalized Interest and Software [Abstract]
Capitalized Software, Net	817,000,000	630,000,000
Depreciation, Amortization and Impairment [Abstract]
Impairment of Intangible Assets, Finite-lived	16,000,000	523,000,000	1,755,000,000
GMIO [Member] | Level 3 [Member]
Depreciation, Amortization and Impairment [Abstract]
Property, Plant and Equipment Impaired Assets, FairValue	85,000,000
GMIO [Member] | Holden Manufacturing Operations [Member] | Level 3 [Member]
Depreciation, Amortization and Impairment [Abstract]
Property, Plant and Equipment Impaired Assets, FairValue		71,000,000
GMIO [Member] | GM India [Member]
Depreciation, Amortization and Impairment [Abstract]
Goodwill and Intangible Asset Impairment		103,000,000
Asset Impairment Charges		383,000,000
Percentage Ownership in GM India		90.80%
GMIO [Member] | GM India [Member] | Level 3 [Member]
Depreciation, Amortization and Impairment [Abstract]
Property, Plant, and Equipment, Fair Value Disclosure		45,000,000
GMIO [Member] | GM India [Member] | Noncontrolling Interests [Member]
Depreciation, Amortization and Impairment [Abstract]
Asset Impairment Charges		35,000,000
GME [Member]
Depreciation, Amortization and Impairment [Abstract]
Asset Impairment Charges				5,500,000,000
Impairment of Intangible Assets, Finite-lived				1,800,000,000
GME [Member] | Level 3 [Member]
Depreciation, Amortization and Impairment [Abstract]
Property, Plant and Equipment Impaired Assets, FairValue	11,000,000		400,000,000	400,000,000
Segments other than GME and GMIO [Member] | Level 3 [Member]
Depreciation, Amortization and Impairment [Abstract]
Property, Plant and Equipment Impaired Assets, FairValue	0	0	0	0
Property, Plant and Equipment [Member]
Capitalized Interest and Software [Abstract]
Capitalized Interest	70,000,000	81,000,000	117,000,000
Depreciation, Amortization and Impairment [Abstract]
Depreciation and amortization expense	4,187,000,000	3,959,000,000	3,888,000,000
Impairment Charges	709,000,000	901,000,000	3,793,000,000
Depreciation, Impairment Charges and Amortization Expense	4,896,000,000	4,860,000,000	7,681,000,000
Capitalized Software Amortization Expense	295,000,000	244,000,000	209,000,000
Property, Plant and Equipment [Member] | GMIO [Member]
Depreciation, Amortization and Impairment [Abstract]
Impairment Charges	321,000,000
Property, Plant and Equipment [Member] | GMIO [Member] | Automotive Cost of Sales [Member] | Holden Manufacturing Operations [Member]
Depreciation, Amortization and Impairment [Abstract]
Impairment Charges		477,000,000
Property, Plant and Equipment [Member] | GMIO [Member] | GM India [Member] | Automotive Cost of Sales [Member]
Depreciation, Amortization and Impairment [Abstract]
Impairment Charges		280,000,000
Property, Plant and Equipment [Member] | GME [Member]
Depreciation, Amortization and Impairment [Abstract]
Impairment Charges	179,000,000
Property, Plant and Equipment [Member] | GME [Member] | Automotive Cost of Sales [Member]
Depreciation, Amortization and Impairment [Abstract]
Impairment Charges				3,700,000,000
Land [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Real Estate, Plants and Equipment	1,695,000,000	1,868,000,000
Buildings and Improvements [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Real Estate, Plants and Equipment	5,236,000,000	4,971,000,000
Machinery and Equipment [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Real Estate, Plants and Equipment	16,788,000,000	15,222,000,000
Construction in Progress [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Real Estate, Plants and Equipment	4,114,000,000	2,644,000,000
Real estate, plants and equipment [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Real Estate, Plants and Equipment	27,833,000,000	24,705,000,000
Less Accumulated Depreciation	-8,067,000,000	-6,787,000,000
Property, net	19,766,000,000	17,918,000,000
Special Tools, Net [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Property, net	$7,977,000,000	$7,949,000,000
Minimum [Member] | Personal Property [Member] | GMIO [Member] | GM India [Member] | Level 3 [Member]
Fair Value Inputs [Abstract]
Economic Obsolescence	72.00%
Minimum [Member] | Personal Property [Member] | GME [Member] | Level 3 [Member]
Fair Value Inputs [Abstract]
Economic Obsolescence	17.00%
Physical Deterioration	52.00%
Functional Obsolescence	8.00%
Minimum [Member] | Land, Buildings and Improvements [Member] | GMIO [Member] | Holden Manufacturing Operations [Member] | Level 3 [Member]
Fair Value Inputs [Abstract]
Holding Period	0 years
Discount Rate	11.00%
Minimum [Member] | Land, Buildings and Improvements [Member] | GME [Member] | Level 3 [Member]
Fair Value Inputs [Abstract]
Holding Period	0 years
Discount Rate	11.20%
Demolition Costs	6.00%
Minimum [Member] | Buildings and Improvements [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Estimated Useful Life in Years	5 years
Minimum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Estimated Useful Life in Years	3 years
Minimum [Member] | Special Tools, Net [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Estimated Useful Life in Years	1 year
Maximum [Member] | Personal Property [Member] | GMIO [Member] | GM India [Member] | Level 3 [Member]
Fair Value Inputs [Abstract]
Economic Obsolescence	100.00%
Maximum [Member] | Personal Property [Member] | GME [Member] | Level 3 [Member]
Fair Value Inputs [Abstract]
Economic Obsolescence	23.00%
Physical Deterioration	69.00%
Functional Obsolescence	28.00%
Maximum [Member] | Land, Buildings and Improvements [Member] | GMIO [Member] | Holden Manufacturing Operations [Member] | Level 3 [Member]
Fair Value Inputs [Abstract]
Holding Period	3 years
Discount Rate	12.00%
Maximum [Member] | Land, Buildings and Improvements [Member] | GME [Member] | Level 3 [Member]
Fair Value Inputs [Abstract]
Holding Period	4 years
Discount Rate	14.50%
Demolition Costs	23.00%
Maximum [Member] | Buildings and Improvements [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Estimated Useful Life in Years	40 years
Maximum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Estimated Useful Life in Years	27 years
Maximum [Member] | Special Tools, Net [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Estimated Useful Life in Years	15 years

Goodwill_Details

Goodwill (Details) (USD $)	12 Months Ended			3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2013
Goodwill [Roll Forward]
Goodwill	$1,560	$1,973
Impairment charges	-120	-541	-27,145
Goodwill from business combinations		154
Effect of foreign currency and other	-13	-26
Goodwill	1,427	1,560	1,973	1,973	1,560
Accumulated impairment charges	-30,558	-30,438	-29,897	-29,897	-30,438
Reversal of Valuation Allowance			-36,364
Automotive [Member]
Goodwill [Roll Forward]
Goodwill	138	695
Impairment charges	-120	-541
Goodwill from business combinations		10
Effect of foreign currency and other	-18	-26
Goodwill	0	138			138
Accumulated impairment charges	-30,558	-30,438	-29,897	-29,897	-30,438
GM Financial [Member]
Goodwill [Roll Forward]
Goodwill	1,422	1,278
Impairment charges	0	0
Goodwill from business combinations		144
Effect of foreign currency and other	5	0
Goodwill	1,427	1,422			1,422
Accumulated impairment charges	0	0	0	0	0
GMSA [Member] | Automotive [Member]
Goodwill [Roll Forward]
Impairment charges	-120
Goodwill	0
GMNA [Member] | Automotive [Member]
Goodwill [Roll Forward]
Impairment charges				-26,400
Reversal of Valuation Allowance			36,200
GME [Member] | Automotive [Member]
Goodwill [Roll Forward]
Impairment charges			-590
GMIO [Member]
Goodwill [Roll Forward]
Impairment charges					-481
GMIO [Member] | Automotive [Member]
Goodwill [Roll Forward]
Impairment charges		-541	-156
Goodwill		$0			$0

Intangible_Assets_net_Details

Intangible Assets, net (Details) (USD $)	12 Months Ended			3 Months Ended	1 Months Ended		3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2013	31-May-13	Mar. 31, 2013	Dec. 31, 2013
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross Carrying Amount	$14,079,000,000	$14,129,000,000			$14,129,000,000			$14,129,000,000
Intangible Assets, Accumulated Amortization	9,192,000,000	8,557,000,000			8,557,000,000			8,557,000,000
Intangible Assets, Net Carrying Amount	4,887,000,000	5,572,000,000			5,572,000,000			5,572,000,000
Nonamortizing in process research and development	96,000,000	96,000,000			96,000,000			96,000,000
Total Intangible Assets, Gross Carrying Amount	14,175,000,000	14,225,000,000			14,225,000,000			14,225,000,000
Intangible Assets, Net	4,983,000,000	5,668,000,000			5,668,000,000			5,668,000,000
Amortization Expense	676,000,000	1,281,000,000	1,568,000,000
Impairment of Intangible Assets, Finite-lived	16,000,000	523,000,000	1,755,000,000
Estimated Amortization Expense, 2015	332,000,000
Estimated Amortization Expense, 2016	311,000,000
Estimated Amortization Expense, 2017	306,000,000
Estimated Amortization Expense, 2018	302,000,000
Estimated Amortization Expense, 2019	205,000,000
GME [Member]
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]
Impairment of Intangible Assets, Finite-lived				1,800,000,000
GME [Member] | Level 3 [Member]
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets, Fair Value			139,000,000	139,000,000
Technology and Intellectual Property [Member]
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross Carrying Amount	8,193,000,000	8,210,000,000			8,210,000,000			8,210,000,000
Intangible Assets, Accumulated Amortization	7,744,000,000	7,308,000,000			7,308,000,000			7,308,000,000
Intangible Assets, Net Carrying Amount	449,000,000	902,000,000			902,000,000			902,000,000
Technology and Intellectual Property [Member] | Product development agreement with Peugeot S.A. [Member]
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]
Purchase Obligation		480,000,000			480,000,000		642,000,000	480,000,000
Payments to Acquire Intangible Assets						201,000,000
Finite-lived Intangible Assets Acquired							594,000,000
Impairment of Intangible Assets, Finite-lived					211,000,000
Technology and Intellectual Property [Member] | Product development agreement with Peugeot S.A. [Member] | GMNA [Member] | Automotive Cost of Sales [Member]
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]
Loss on Contracts					49,000,000
Brands [Member]
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross Carrying Amount	4,447,000,000	4,466,000,000			4,466,000,000			4,466,000,000
Intangible Assets, Accumulated Amortization	683,000,000	559,000,000			559,000,000			559,000,000
Intangible Assets, Net Carrying Amount	3,764,000,000	3,907,000,000			3,907,000,000			3,907,000,000
Brands [Member] | GME [Member] | Level 3 [Member]
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]
Long-term growth rate			0.50%
Pre-tax royalty rate			0.14%
Discount rate			21.25%
Dealer Network and Customer Relationships [Member]
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross Carrying Amount	1,094,000,000	1,108,000,000			1,108,000,000			1,108,000,000
Intangible Assets, Accumulated Amortization	434,000,000	364,000,000			364,000,000			364,000,000
Intangible Assets, Net Carrying Amount	660,000,000	744,000,000			744,000,000			744,000,000
Dealer Network and Customer Relationships [Member] | GMIO [Member] | Level 3 [Member] | Withdrawal of the Chevrolet Brand from Europe [Member]
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets, Fair Value		0			0			0
Dealer Network and Customer Relationships [Member] | GMIO [Member] | Automotive Cost of Sales [Member] | Withdrawal of the Chevrolet Brand from Europe [Member]
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]
Impairment of Intangible Assets, Finite-lived								264,000,000
Dealer Network and Customer Relationships [Member] | GME [Member] | Level 3 [Member]
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets, Fair Value			0	0
Favorable Contracts and Other [Member]
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross Carrying Amount	345,000,000	345,000,000			345,000,000			345,000,000
Intangible Assets, Accumulated Amortization	331,000,000	326,000,000			326,000,000			326,000,000
Intangible Assets, Net Carrying Amount	14,000,000	19,000,000			19,000,000			19,000,000
Favorable Contracts and Other [Member] | GMIO [Member] | GM India [Member] | Level 3 [Member]
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets, Fair Value		0			0			0
Favorable Contracts and Other [Member] | GMIO [Member] | GM India [Member] | Automotive Cost of Sales [Member]
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]
Impairment of Intangible Assets, Finite-lived		48,000,000
Customer Relationships and Trade Name [Member] | GME [Member] | Automotive Selling, General and Administrative Expense [Member]
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]
Impairment of Intangible Assets, Finite-lived			$1,800,000,000

Variable_Interest_Entities_Det

Variable Interest Entities (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Consolidated [Abstract]
Maximum Maturity Days for Highly Liquid Securities	90 days
GM Financial [Member] | Consolidated VIE [Member]
Consolidated [Abstract]
Restricted Cash	$1,721	$1,523
Securitized Assets	27,704	23,584
Securitization Notes Payable and Other Credit Facilities	$22,794	$19,448
Maximum Maturity Days for Highly Liquid Securities	90 days

Accrued_Liabilities_and_Other_2

Accrued Liabilities and Other Liabilities Accrued Liabilities and Other Liabilities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Accrued Liabilities and Other Liabilities, Current
Dealer and customer allowances, claims and discounts	$8,035	$7,919
Deposits primarily from rental car companies	6,089	4,713
Deferred revenue	1,622	1,276
Product warranty and related liabilities	3,582	2,721
Payrolls and employee benefits excluding postemployment benefits	2,144	2,285
Other	6,712	5,719
Total accrued liabilities	28,184	24,633
Accrued Liabilities and Other Liabilities, Noncurrent [Abstract]
Deferred revenue	1,556	1,249
Product warranty and related liabilities	6,064	4,880
Employee benefits excluding postemployment benefits	1,049	1,192
Postemployment benefits including facility idling reserves	1,259	1,216
Other	4,154	4,816
Total other liabilities	$14,082	$13,353

Accrued_Liabilities_and_Other_3

Accrued Liabilities and Other Liabilities Summary of Activity for Product Warranty and Related Liabilities (Details) (USD $)	12 Months Ended			3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2014
Product Warranty and Related Liabilities [Roll Forward]
Beginning balance	$7,601	$7,633	$7,031		$7,601
Warranties issued and assumed in period - recall campaigns and courtesy transportation	2,910	640	775
Warranties issued and assumed in period - policy and warranty	2,540	2,757	2,840
Payments	-4,326	-3,240	-3,575
Adjustments to pre-existing warranties	1,187	49	504
Effect of foreign currency and other	-266	-238	58
Ending balance	9,646	7,601	7,633			9,646
Statement [Line Items]
Vehicles recalled	42,000,000
Recalls - Ignition Switch [Member]
Statement [Line Items]
Recall Charges	680
Vehicles recalled	2,600,000
Recall Cost Adjustment - Courtesy Transportation	-95
Recall Cost Adjustment - Repair Efficiency	-80
Recalls - Steering [Member]
Statement [Line Items]
Recall Charges	340
Vehicles recalled	1,900,000
Recalls - Side Impact Restraints Non-Deployment [Member]
Statement [Line Items]
Recall Charges	185
Vehicles recalled	1,300,000
Recalls - Break Lamp Wiring Harness [Member]
Statement [Line Items]
Recall Charges	90
Vehicles recalled	2,700,000
Recalls - Safety Belt Cable Fatigue [Member]
Statement [Line Items]
Recall Charges	80
Vehicles recalled	1,500,000
Recalls - Shift Cable Wear Out [Member]
Statement [Line Items]
Recall Charges	150
Vehicles recalled	1,400,000
Recalls - Ignition Keys [Member]
Statement [Line Items]
Recall Charges	325
Vehicles recalled	12,100,000
Recalls - Other matters [Member]
Statement [Line Items]
Recall Charges	520
Vehicles recalled	5,200,000
GMNA [Member]
Statement [Line Items]
Percentage of Recall Cost Recorded	86.00%
Recall Charges				1,100	1,300
Vehicles recalled						8,100,000
Number of Recalls						23
GMNA [Member] | Warranty Obligations [Member]
Statement [Line Items]
Recall campaigns catch-up adjustment				$874		200

ShortTerm_and_LongTerm_Debt_Ca

Short-Term and Long-Term Debt Carrying Amount and Fair Value (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Automotive [Member]
Debt Instrument [Line Items]
Carrying Amount	$9,410,000,000	$7,137,000,000
Fair Value	9,799,000,000	6,837,000,000
Available under credit facility agreements	12,026,000,000	10,404,000,000
Weighted Average Interest Rate on Outstanding Short-term Debt	6.40%	9.00%
Weighted Average Interest Rate on Outstanding Long-term Debt	4.30%	3.80%
Unamortized Discount (Premium), Net	681,000,000	765,000,000
Automotive [Member] | Level 1 [Member]
Debt Instrument [Line Items]
Fair Value	7,600,000,000
Automotive [Member] | Level 2 [Member]
Debt Instrument [Line Items]
Fair Value	2,200,000,000	6,800,000,000
Automotive [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Carrying Amount	237,000,000	320,000,000
Automotive [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Carrying Amount	8,205,000,000	5,852,000,000
GM Financial [Member]
Debt Instrument [Line Items]
Carrying Amount	37,431,000,000	29,046,000,000
Fair Value	37,707,000,000	29,248,000,000
GM Financial [Member] | Level 2 [Member]
Debt Instrument [Line Items]
Fair Value	32,800,000,000	23,000,000,000
GM Financial [Member] | Level 3 [Member]
Debt Instrument [Line Items]
Fair Value	4,900,000,000	6,200,000,000
GM Financial [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Carrying Amount	25,214,000,000	22,073,000,000
Fair Value	25,228,000,000	22,170,000,000
GM Financial [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Carrying Amount	12,217,000,000	6,973,000,000
Fair Value	12,479,000,000	7,078,000,000
Capital Lease Obligations [Member] | Automotive [Member]
Debt Instrument [Line Items]
Carrying Amount	968,000,000	965,000,000
Capital Lease Obligations [Member] | GM Financial [Member]
Debt Instrument [Line Items]
Carrying Amount	$0
Minimum [Member] | Automotive [Member]
Debt Instrument [Line Items]
Interest Rate, Stated Percentage	0.00%	0.00%
Maximum [Member] | Automotive [Member]
Debt Instrument [Line Items]
Interest Rate, Stated Percentage	18.00%	19.00%

ShortTerm_and_LongTerm_Debt_Se

Short-Term and Long-Term Debt Secured Debt (Details) (GM Financial [Member], Secured Debt [Member], USD $)	12 Months Ended
In Billions, unless otherwise specified	Dec. 31, 2014
Minimum [Member]
Line of Credit Facility [Line Items]
Debt, Weighted Average Interest Rate	0.35%
Maximum [Member]
Line of Credit Facility [Line Items]
Debt, Weighted Average Interest Rate	13.43%
Securitization notes payable [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Maturity Date Range, Start	31-Dec-16
Debt Instrument, Maturity Date Range, End	31-Dec-22
Securitization Notes Payable Issued in Period	$10.70
Weighted Average Interest for Debt Issued	1.40%
Debt Instrument, Maturity Date	31-Dec-22
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line Of Credit Increase Maximum Borrowing Capacity	$5.50
Revolving Credit Facility [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Term	5 years

ShortTerm_and_LongTerm_Debt_Un

Short-Term and Long-Term Debt Unsecured Debt and Extinguishment of Debt (Details)

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

1 Months Ended

1 Months Ended

1 Months Ended

1 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2013

Nov. 30, 2014

Dec. 31, 2014

Nov. 30, 2014

Dec. 31, 2014

Nov. 30, 2014

Dec. 31, 2014

Nov. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2013

Dec. 31, 2014

31-May-14

Jul. 31, 2014

Dec. 31, 2014

Jul. 31, 2014

Dec. 31, 2014

Jul. 31, 2014

Sep. 30, 2014

Dec. 31, 2014

Sep. 30, 2014

Dec. 31, 2014

Sep. 30, 2014

Dec. 31, 2014

Oct. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Oct. 31, 2014

Sep. 30, 2014

Dec. 31, 2014

Dec. 31, 2014

Oct. 31, 2014

Oct. 31, 2014

Oct. 31, 2014

Oct. 31, 2014

Oct. 31, 2014

Oct. 31, 2014

Oct. 31, 2014

Jan. 31, 2015

Jan. 31, 2015

Jan. 31, 2015

Jan. 31, 2015

USD ($)

USD ($)

USD ($)

Automotive [Member]

Automotive [Member]

Automotive [Member]

Automotive [Member]

Automotive [Member]

Automotive [Member]

Automotive [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Senior Notes [Member]

Senior Notes [Member]

Senior Notes [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility October 2014 [Member]

Revolving Credit Facility October 2014 [Member]

Three-year Revolving Credit Facility October 2014 [Member]

Three-year Revolving Credit Facility October 2014 [Member]

Five-year Revolving Credit Facility October 2014 [Member]

Five-year Revolving Credit Facility October 2014 [Member]

U.S.

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

USD ($)

USD ($)

USD ($)

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Automotive [Member]

Automotive [Member]

Automotive [Member]

Automotive [Member]

Automotive [Member]

Automotive [Member]

Automotive [Member]

Automotive [Member]

Automotive [Member]

Automotive [Member]

Automotive [Member]

Automotive [Member]

Automotive [Member]

Automotive [Member]

GM Financial [Member]

GM Financial [Member]

GM Financial [Member]

GM Financial [Member]

GM Financial [Member]

GM Financial [Member]

GM Financial [Member]

GM Financial [Member]

GM Financial [Member]

GM Financial [Member]

GM Financial [Member]

GM Financial [Member]

GM Financial [Member]

GM Financial [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Revolving Credit Facility October 2014 [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Senior Notes Issued November 2014 [Member]

Senior Notes 2025 at 4.0% [Member]

Senior Notes 2025 at 4.0% [Member]

Senior Notes 2035 at 5.0% [Member]

Senior Notes 2035 at 5.0% [Member]

Senior Notes 2045 at 5.2% [Member]

Senior Notes 2045 at 5.2% [Member]

Senior Notes Issued September 2013 [Member]

Senior Notes 2018 at 3.5% [Member]

Senior Notes 2018 at 3.5% [Member]

Senior Notes 2023 at 4.875% [Member]

Senior Notes 2023 at 4.875% [Member]

Senior Notes 2043 at 6.25% [Member]

Senior Notes 2043 at 6.25% [Member]

Senior Notes Issued May 2014 [Member]

Senior Notes Issued May 2014 [Member]

Senior Notes Issued July 2014 [Member]

Senior Notes July 2017 at 2.625% [Member]

Senior Notes July 2017 at 2.625% [Member]

Senior Notes July 2019 at 3.5% [Member]

Senior Notes July 2019 at 3.5% [Member]

Senior Notes Issued September 2014 [Member]

Senior Notes September 2017 at 3.0% [Member]

Senior Notes September 2017 at 3.0% [Member]

Senior Notes September 2021 at 4.375% [Member]

Senior Notes September 2021 at 4.375% [Member]

Term Notes Issued October 2014 [Member]

Term Notes Issued October 2014 [Member]

GM Financial [Member]

GM Financial [Member]

GM Financial [Member]

Automotive [Member]

Automotive [Member]

GM Financial [Member]

GM Financial [Member]

Automotive [Member]

Automotive [Member]

Automotive [Member]

GM Financial [Member]

Automotive [Member]

GM Financial [Member]

Unsecured Debt [Member]

GM Financial [Member]

GM Financial [Member]

GM Financial [Member]

GM Financial [Member]

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

CAD

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

EUR (€)

Minimum [Member]

Maximum [Member]

USD ($)

Minimum [Member]

Maximum [Member]

USD ($)

Minimum [Member]

USD ($)

USD ($)

USD ($)

USD ($)

Automotive [Member]

Senior Notes Issued January 2015 [Member]

Senior Notes January 2020 at 3.15% [Member]

Senior Notes January 2025 at 4.0% [Member]

Senior Notes January 2020 at Floating Rates [Member]

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

Debt Instrument [Line Items]

Line of Credit Facility, Maximum Borrowing Capacity

$11,000,000,000

$12,500,000,000

$5,000,000,000

$7,500,000,000

Number of Credit Facilities Entered Into

2

Debt Instrument, Term

5 years

3 years

5 years

Sublimit available to GM FInancial

2,000,000,000

2,000,000,000

Sublimit available for issuance of letters of credit

1,600,000,000

500,000,000

Sublimit available for borrowing denominated in Brazilian Real

305,000,000

195,000,000

Debt covenant, minimum liquidity requirement

4,000,000,000

2,000,000,000

Number of agencies needed to maintain investment grade rating

2

Debt Instrument, Face Amount

2,500,000,000

500,000,000

750,000,000

1,250,000,000

4,500,000,000

1,500,000,000

1,500,000,000

1,500,000,000

400,000,000

1,500,000,000

700,000,000

800,000,000

2,000,000,000

750,000,000

1,250,000,000

500,000,000

2,250,000,000

1,000,000,000

1,000,000,000

250,000,000

Interest Rate, Stated Percentage

0.00%

0.00%

18.00%

19.00%

4.00%

5.00%

5.20%

3.50%

4.88%

6.25%

3.25%

2.63%

3.50%

3.00%

4.38%

1.88%

1.88%

6.75%

0.98%

13.35%

3.15%

4.00%

Debt Instrument, Maturity Date

31-Dec-25

31-Dec-35

31-Dec-45

31-Dec-18

31-Dec-23

31-Dec-43

31-May-17

31-Jul-17

31-Jul-19

30-Sep-17

30-Sep-21

31-Oct-19

31-Jan-20

31-Jan-25

31-Jan-20

Debt Instrument, Maturity Date Range, Start

31-Dec-16

Debt Instrument, Maturity Date Range, End

31-Dec-23

Extinguishment of Debt, Amount

325,000,000

1,800,000,000

514,000,000

Gain (loss) on extinguishment of debt

$202,000,000

($212,000,000)

($250,000,000)

$202,000,000

($212,000,000)

($250,000,000)

ShortTerm_and_LongTerm_Debt_In

Short-Term and Long-Term Debt Interest Expense and LT Debt Maturities (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Interest Expense	$1,829,000,000	$1,049,000,000	$772,000,000
Long-term Debt, Maturities, 2015	14,994,000,000
Long-term Debt, Maturities, 2016	9,351,000,000
Long-term Debt, Maturities, 2017	7,766,000,000
Long-term Debt, Maturities, 2018	4,266,000,000
Long-term Debt, Maturities, 2019	1,969,000,000
Long-term Debt, Maturities, Thereafter	9,194,000,000
Long-term Debt, Maturities, Total	47,540,000,000
Automotive [Member]
Debt Instrument [Line Items]
Interest Expense	403,000,000	334,000,000	489,000,000
Long-term Debt, Maturities, 2015	503,000,000
Long-term Debt, Maturities, 2016	174,000,000
Long-term Debt, Maturities, 2017	511,000,000
Long-term Debt, Maturities, 2018	1,600,000,000
Long-term Debt, Maturities, 2019	109,000,000
Long-term Debt, Maturities, Thereafter	7,194,000,000
Long-term Debt, Maturities, Total	10,091,000,000
Future interest payments on capital lease obligations	488,000,000
Capital Lease Obligations	9,410,000,000	7,137,000,000
GM Financial [Member]
Debt Instrument [Line Items]
Financing Interest Expense	1,426,000,000	715,000,000	283,000,000
Long-term Debt, Maturities, 2015	14,491,000,000
Long-term Debt, Maturities, 2016	9,177,000,000
Long-term Debt, Maturities, 2017	7,255,000,000
Long-term Debt, Maturities, 2018	2,666,000,000
Long-term Debt, Maturities, 2019	1,860,000,000
Long-term Debt, Maturities, Thereafter	2,000,000,000
Long-term Debt, Maturities, Total	37,449,000,000
Capital Lease Obligations	37,431,000,000	29,046,000,000
Capital Lease Obligations [Member] | Automotive [Member]
Debt Instrument [Line Items]
Capital Lease Obligations	968,000,000	965,000,000
Capital Lease Obligations [Member] | GM Financial [Member]
Debt Instrument [Line Items]
Capital Lease Obligations	$0

Pensions_And_Other_Postretirem2

Pensions And Other Postretirement Benefits Contributions (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Defined Contribution Plan, Total Employer Contributions	$513	$502	$352
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Years of Service	30 years
Employer contributions	913	1,014	3,275
US Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Employer Contributions in Next Fiscal Year	70
Employer contributions	143	128	2,420
Non-US Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Employer Contributions in Next Fiscal Year	1,100
Employer contributions	770	886	855
US OPEB Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	354	393	432
Plan participants' contributions	22	29	4
Total Contributions	$376	$422	$436

Pensions_And_Other_Postretirem3

Pensions And Other Postretirement Benefits Significant Plan Amendments (Details) (USD $)	3 Months Ended	12 Months Ended		1 Months Ended	12 Months Ended	1 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2011	Mar. 31, 2012
US Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability Increase due to Mortality Assumptions	$2,200,000,000
Liability (Increase) Decrease Due to Amendments		0	0
U.S. Salaried Defined Benefit Life Insurance Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) in OPEB liability				-319,000,000
Decrease in pre-tax actuarial loss of AOCI				236,000,000
Pre-tax gain (loss) due to settlement and curtailment				83,000,000
U.S. Salaried Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Decrease to Liability Due to Curtailments					309,000,000
Settlements, Benefit Obligation					30,600,000,000
Total Lump-sum Payments			430,000,000		3,600,000,000
Settlements, Previously Guaranteed Obligations					1,900,000,000
Pre-tax gain (loss) due to settlement			128,000,000		-2,600,000,000
After-tax gain (loss) due to settlement					-2,200,000,000
Pre-tax loss existing from AOCI					377,000,000
Premium Paid					2,100,000,000
Tax benefit					413,000,000
Statutory tax benefit					1,000,000,000
Tax expense					596,000,000
Loan to Plan					2,200,000,000
Loan contributed to the Plan					1,700,000,000
Legal Services Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability (Increase) Decrease Due to Amendments						266,000,000
Non-US Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability (Increase) Decrease Due to Amendments		-17,000,000	4,000,000
Non-US Pension Plans [Member] | GME [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Interim Remeasurement							150,000,000
Group Annuity Contracts [Member] | U.S. Salaried Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Settlements, Benefit Obligation					$25,100,000,000

Pensions_and_OPEB_Obligations_

Pensions and OPEB Obligations and Plan Assets (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
US Pension Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning benefit obligation	$71,480	$82,110
Service Cost	247	298
Interest Cost	3,060	2,837	4,055
Amendments	0	0
Actuarial (gains) losses	7,770	-7,661
Benefits paid	-5,779	-5,719
Foreign currency translation adjustments	0	0
Curtailments, settlements, and other	-54	-385
Ending benefit obligation	76,724	71,480	82,110
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning fair value of plan assets	64,166	68,085
Actual return on plan assets	7,346	2,107
Employer contributions	143	128	2,420
Benefits paid	-5,779	-5,719
Foreign currency translation adjustments	0	0
Settlements and other	-53	-435
Ending fair value of plan assets	65,823	64,166	68,085
Ending funded status	-10,901	-7,314
Amounts Recognized in Consolidated Balance Sheet [Abstract]
Non-current Assets	0	0
Current Liabilities	-69	-131
Non-current Liabilities	-10,832	-7,183
Net Amounts Recorded	-10,901	-7,314
Amount Recorded in Accumulated Other Comprehensive Income (Loss) [Abstract]
Net actuarial gain (loss)	452	4,747
Net Prior Service (Cost) Credit	35	38
Total recorded in Accumulated other comprehensive income (loss)	487	4,785
Non-US Pension Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning benefit obligation	27,528	29,301
Service Cost	358	394
Interest Cost	1,031	1,010	1,110
Amendments	17	-4
Actuarial (gains) losses	3,179	-1,009
Benefits paid	-1,699	-1,683
Foreign currency translation adjustments	-2,536	-528
Curtailments, settlements, and other	19	47
Ending benefit obligation	27,897	27,528	29,301
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning fair value of plan assets	14,986	15,541
Actual return on plan assets	1,893	988
Employer contributions	770	886	855
Benefits paid	-1,699	-1,683
Foreign currency translation adjustments	-1,232	-692
Settlements and other	-49	-54
Ending fair value of plan assets	14,669	14,986	15,541
Ending funded status	-13,228	-12,542
Amounts Recognized in Consolidated Balance Sheet [Abstract]
Non-current Assets	111	137
Current Liabilities	-383	-379
Non-current Liabilities	-12,956	-12,300
Net Amounts Recorded	-13,228	-12,542
Amount Recorded in Accumulated Other Comprehensive Income (Loss) [Abstract]
Net actuarial gain (loss)	-5,019	-3,379
Net Prior Service (Cost) Credit	-57	-87
Total recorded in Accumulated other comprehensive income (loss)	-5,076	-3,466
US OPEB Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning benefit obligation	5,110	6,271
Service Cost	13	24	23
Interest Cost	218	217	234
Amendments	0	0
Actuarial (gains) losses	331	-757
Benefits paid	-376	-422
Foreign currency translation adjustments	0	0
Curtailments, settlements, and other	-7	-223
Ending benefit obligation	5,289	5,110	6,271
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning fair value of plan assets	0	0
Actual return on plan assets	0	0
Employer contributions	354	393	432
Benefits paid	-376	-422
Foreign currency translation adjustments	0	0
Settlements and other	22	29
Ending fair value of plan assets	0	0	0
Ending funded status	-5,289	-5,110
Amounts Recognized in Consolidated Balance Sheet [Abstract]
Non-current Assets	0	0
Current Liabilities	-338	-368
Non-current Liabilities	-4,951	-4,742
Net Amounts Recorded	-5,289	-5,110
Amount Recorded in Accumulated Other Comprehensive Income (Loss) [Abstract]
Net actuarial gain (loss)	-859	-542
Net Prior Service (Cost) Credit	16	19
Total recorded in Accumulated other comprehensive income (loss)	-843	-523
Non-US OPEB Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning benefit obligation	1,238	1,528
Service Cost	10	13	16
Interest Cost	55	57	63
Amendments	0	-4
Actuarial (gains) losses	117	-210
Benefits paid	-50	-53
Foreign currency translation adjustments	-108	-98
Curtailments, settlements, and other	74	5
Ending benefit obligation	1,336	1,238	1,528
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning fair value of plan assets	0	0
Actual return on plan assets	0	0
Employer contributions	48	51
Benefits paid	-50	-53
Foreign currency translation adjustments	0	0
Settlements and other	2	2
Ending fair value of plan assets	0	0	0
Ending funded status	-1,336	-1,238
Amounts Recognized in Consolidated Balance Sheet [Abstract]
Non-current Assets	0	0
Current Liabilities	-58	-83
Non-current Liabilities	-1,278	-1,155
Net Amounts Recorded	-1,336	-1,238
Amount Recorded in Accumulated Other Comprehensive Income (Loss) [Abstract]
Net actuarial gain (loss)	-83	47
Net Prior Service (Cost) Credit	72	91
Total recorded in Accumulated other comprehensive income (loss)	($11)	$138

Pensions_And_Other_Postretirem4

Pensions And Other Postretirement Benefits Accumulated Benefit Oblligations and Projected Benefit Obligations (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
US Pension Plans [Member]
ABO and PBO [Line Items]
ABO	$76,702	$71,461
Plans with ABO in Excess of Plan Assets [Abstract]
ABO	76,702	71,461
Fair Value of Plan Assets	65,823	64,166
Plans with PBO in Excess of Plan Assets [Abstract]
PBO	76,724	71,480
Fair Value of Plan Assets	65,823	64,166
Non-US Pension Plans [Member]
ABO and PBO [Line Items]
ABO	27,425	27,069
Plans with ABO in Excess of Plan Assets [Abstract]
ABO	26,510	25,897
Fair Value of Plan Assets	13,638	13,663
Plans with PBO in Excess of Plan Assets [Abstract]
PBO	26,935	26,788
Fair Value of Plan Assets	$13,643	$14,109

Pensions_And_Other_Postretirem5

Pensions And Other Postretirement Benefits Components of Expense and Assumptions (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2015
Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year [Abstract]
Amounts to be amortized from Accumulated other comprehensive (income) loss	$295
US Pension Plans [Member]
Components of Expense [Abstract]
Service Cost Including Administrative Expenses	380	395	590
Service Cost	247	298
Interest Cost	3,060	2,837	4,055
Expected Return on Plan Assets	-3,914	-3,562	-5,029
Amortization of Prior Service Cost (Credit)	-4	-4	-1
Recognized net actuarial loss	-91	6	2
Curtailments, Settlements and Other	-1	-77	2,580
Net Periodic Pension and OPEB Expense (Income)	-570	-405	2,197
Administrative Expense	133	97	138
Weighted-average assumptions used to determine benefit obligations [Abstract]
Discount rate	3.73%	4.46%	3.59%
Weighted-average assumptions used to determine net expense [Abstract]
Discount rate	4.46%	3.59%	4.06%
Expected return on plan assets	6.53%	5.77%	6.18%
Rate of compensation increase			4.50%
Non-US Pension Plans [Member]
Components of Expense [Abstract]
Service Cost Including Administrative Expenses	389	425	411
Service Cost	358	394
Interest Cost	1,031	1,010	1,110
Expected Return on Plan Assets	-873	-823	-870
Amortization of Prior Service Cost (Credit)	17	19	1
Recognized net actuarial loss	154	208	35
Curtailments, Settlements and Other	3	-6	71
Net Periodic Pension and OPEB Expense (Income)	721	833	758
Weighted-average assumptions used to determine benefit obligations [Abstract]
Discount rate	3.14%	4.10%	3.70%
Rate of compensation increase	2.85%	2.90%	2.77%
Weighted-average assumptions used to determine net expense [Abstract]
Discount rate	4.10%	3.69%	4.45%
Expected return on plan assets	6.28%	5.70%	6.20%
Rate of compensation increase	2.90%	2.77%	3.15%
US OPEB Plans [Member]
Components of Expense [Abstract]
Service Cost	13	24	23
Interest Cost	218	217	234
Expected Return on Plan Assets	0	0	0
Amortization of Prior Service Cost (Credit)	-2	-116	-116
Recognized net actuarial loss	14	85	52
Curtailments, Settlements and Other	0	-62	0
Net Periodic Pension and OPEB Expense (Income)	243	148	193
Weighted-average assumptions used to determine benefit obligations [Abstract]
Discount rate	3.80%	4.52%	3.68%
Rate of compensation increase			4.50%
Weighted-average assumptions used to determine net expense [Abstract]
Discount rate	4.52%	3.69%	4.24%
Rate of compensation increase		4.50%	4.50%
Non-US OPEB Plans [Member]
Components of Expense [Abstract]
Service Cost	10	13	16
Interest Cost	55	57	63
Expected Return on Plan Assets	0	0	0
Amortization of Prior Service Cost (Credit)	-14	-14	-12
Recognized net actuarial loss	-6	6	6
Curtailments, Settlements and Other	0	0	11
Net Periodic Pension and OPEB Expense (Income)	$45	$62	$84
Weighted-average assumptions used to determine benefit obligations [Abstract]
Discount rate	3.99%	4.71%	3.97%
Rate of compensation increase	4.21%	4.21%	4.21%
Weighted-average assumptions used to determine net expense [Abstract]
Discount rate	4.71%	3.97%	4.31%
Rate of compensation increase	4.21%	4.21%	4.21%
Scenario, Forecast [Member] | US Pension Plans [Member]
Weighted-average assumptions used to determine net expense [Abstract]
Expected return on plan assets				6.40%

Pensions_And_Other_Postretirem6

Pensions And Other Postretirement Benefits Target Allocation tables (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
US Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	100.00%	100.00%
Non-US Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	100.00%	100.00%
Equity [Member] | US Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	16.00%	19.00%
Equity [Member] | Non-US Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	27.00%	28.00%
Debt [Member] | US Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	60.00%	58.00%
Debt [Member] | Non-US Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	47.00%	49.00%
Other [Member] | US Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	24.00%	23.00%
Other [Member] | Non-US Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	26.00%	23.00%

Pensions_And_Other_Postretirem7

Pensions And Other Postretirement Benefits Assets and Fair Value Measurements (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
US Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	$65,773	$63,852
Net plan assets subject to leveling	65,254	63,513
Other plan assets and liabilities	569	653
Net Plan Assets	65,823	64,166	68,085
US Pension Plans [Member] | Cash equivalents and other short-term investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	42	411
US Pension Plans [Member] | Common and preferred stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	10,066	10,310
US Pension Plans [Member] | Government and agency debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	16,143	14,971
US Pension Plans [Member] | Corporate and other debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	22,808	20,777
US Pension Plans [Member] | Investment funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	6,201	6,291
US Pension Plans [Member] | Private equity and debt investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	5,909	6,335
US Pension Plans [Member] | Real estate investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	4,170	4,521
US Pension Plans [Member] | Other investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	65	62
US Pension Plans [Member] | Derivative assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	369	174
US Pension Plans [Member] | Derivative liabilities [Member]
Defined Benefit Plan Disclosure [Line Items]
Liabilities	-519	-339
US Pension Plans [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	10,718	10,740
Net plan assets subject to leveling	10,695	10,718
US Pension Plans [Member] | Level 1 [Member] | Cash equivalents and other short-term investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	0	0
US Pension Plans [Member] | Level 1 [Member] | Common and preferred stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	10,033	10,234
US Pension Plans [Member] | Level 1 [Member] | Government and agency debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	0	0
US Pension Plans [Member] | Level 1 [Member] | Corporate and other debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	0	0
US Pension Plans [Member] | Level 1 [Member] | Investment funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	70	99
US Pension Plans [Member] | Level 1 [Member] | Private equity and debt investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	0	0
US Pension Plans [Member] | Level 1 [Member] | Real estate investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	560	390
US Pension Plans [Member] | Level 1 [Member] | Other investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	0	0
US Pension Plans [Member] | Level 1 [Member] | Derivative assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	55	17
US Pension Plans [Member] | Level 1 [Member] | Derivative liabilities [Member]
Defined Benefit Plan Disclosure [Line Items]
Liabilities	-23	-22
US Pension Plans [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	40,165	37,278
Net plan assets subject to leveling	39,669	36,967
US Pension Plans [Member] | Level 2 [Member] | Cash equivalents and other short-term investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	42	411
US Pension Plans [Member] | Level 2 [Member] | Common and preferred stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	30	70
US Pension Plans [Member] | Level 2 [Member] | Government and agency debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	16,143	14,971
US Pension Plans [Member] | Level 2 [Member] | Corporate and other debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	22,725	20,647
US Pension Plans [Member] | Level 2 [Member] | Investment funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	910	1,018
US Pension Plans [Member] | Level 2 [Member] | Private equity and debt investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	0	0
US Pension Plans [Member] | Level 2 [Member] | Real estate investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	2	4
US Pension Plans [Member] | Level 2 [Member] | Other investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	0	0
US Pension Plans [Member] | Level 2 [Member] | Derivative assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	313	157
US Pension Plans [Member] | Level 2 [Member] | Derivative liabilities [Member]
Defined Benefit Plan Disclosure [Line Items]
Liabilities	-496	-311
US Pension Plans [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	14,890	15,834
Net plan assets subject to leveling	14,890	15,828	15,950
US Pension Plans [Member] | Level 3 [Member] | Cash equivalents and other short-term investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	0	0
US Pension Plans [Member] | Level 3 [Member] | Common and preferred stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	3	6	19
US Pension Plans [Member] | Level 3 [Member] | Government and agency debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	0	0
US Pension Plans [Member] | Level 3 [Member] | Corporate and other debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	83	130	182
US Pension Plans [Member] | Level 3 [Member] | Investment funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	5,221	5,174	4,959
US Pension Plans [Member] | Level 3 [Member] | Private equity and debt investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	5,909	6,335	6,400
US Pension Plans [Member] | Level 3 [Member] | Real estate investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	3,608	4,127	4,335
US Pension Plans [Member] | Level 3 [Member] | Other investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	65	62	63
US Pension Plans [Member] | Level 3 [Member] | Derivative assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	1	0
US Pension Plans [Member] | Level 3 [Member] | Derivative liabilities [Member]
Defined Benefit Plan Disclosure [Line Items]
Liabilities	0	-6
Non-US Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	14,727	14,812
Net plan assets subject to leveling	14,683	14,744
Other plan assets and liabilities	-14	242
Net Plan Assets	14,669	14,986	15,541
Non-US Pension Plans [Member] | Cash equivalents and other short-term investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	207	156
Non-US Pension Plans [Member] | Common and preferred stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	1,962	1,822
Non-US Pension Plans [Member] | Government and agency debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	3,614	3,418
Non-US Pension Plans [Member] | Corporate and other debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	1,986	2,489
Non-US Pension Plans [Member] | Investment funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	4,399	4,402
Non-US Pension Plans [Member] | Private equity and debt investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	509	430
Non-US Pension Plans [Member] | Real estate investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	1,287	1,430
Non-US Pension Plans [Member] | Other investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	722	618
Non-US Pension Plans [Member] | Derivative assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	41	47
Non-US Pension Plans [Member] | Derivative liabilities [Member]
Defined Benefit Plan Disclosure [Line Items]
Liabilities	-44	-68
Non-US Pension Plans [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	2,097	1,960
Net plan assets subject to leveling	2,097	1,948
Non-US Pension Plans [Member] | Level 1 [Member] | Cash equivalents and other short-term investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	0	0
Non-US Pension Plans [Member] | Level 1 [Member] | Common and preferred stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	1,959	1,816
Non-US Pension Plans [Member] | Level 1 [Member] | Government and agency debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	0	0
Non-US Pension Plans [Member] | Level 1 [Member] | Corporate and other debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	0	0
Non-US Pension Plans [Member] | Level 1 [Member] | Investment funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	101	128
Non-US Pension Plans [Member] | Level 1 [Member] | Private equity and debt investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	0	0
Non-US Pension Plans [Member] | Level 1 [Member] | Real estate investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	20	13
Non-US Pension Plans [Member] | Level 1 [Member] | Other investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	0	0
Non-US Pension Plans [Member] | Level 1 [Member] | Derivative assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	17	3
Non-US Pension Plans [Member] | Level 1 [Member] | Derivative liabilities [Member]
Defined Benefit Plan Disclosure [Line Items]
Liabilities	0	-12
Non-US Pension Plans [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	9,247	9,640
Net plan assets subject to leveling	9,203	9,584
Non-US Pension Plans [Member] | Level 2 [Member] | Cash equivalents and other short-term investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	207	156
Non-US Pension Plans [Member] | Level 2 [Member] | Common and preferred stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	3	6
Non-US Pension Plans [Member] | Level 2 [Member] | Government and agency debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	3,614	3,418
Non-US Pension Plans [Member] | Level 2 [Member] | Corporate and other debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	1,986	2,475
Non-US Pension Plans [Member] | Level 2 [Member] | Investment funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	3,409	3,529
Non-US Pension Plans [Member] | Level 2 [Member] | Private equity and debt investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	0	0
Non-US Pension Plans [Member] | Level 2 [Member] | Real estate investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	4	12
Non-US Pension Plans [Member] | Level 2 [Member] | Other investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	0	0
Non-US Pension Plans [Member] | Level 2 [Member] | Derivative assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	24	44
Non-US Pension Plans [Member] | Level 2 [Member] | Derivative liabilities [Member]
Defined Benefit Plan Disclosure [Line Items]
Liabilities	-44	-56
Non-US Pension Plans [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	3,383	3,212
Net plan assets subject to leveling	3,383	3,212
Non-US Pension Plans [Member] | Level 3 [Member] | Cash equivalents and other short-term investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	0	0
Non-US Pension Plans [Member] | Level 3 [Member] | Common and preferred stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	0	0
Non-US Pension Plans [Member] | Level 3 [Member] | Government and agency debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	0	0
Non-US Pension Plans [Member] | Level 3 [Member] | Corporate and other debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	0	14	5
Non-US Pension Plans [Member] | Level 3 [Member] | Investment funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	889	745	641
Non-US Pension Plans [Member] | Level 3 [Member] | Private equity and debt investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	509	430	381
Non-US Pension Plans [Member] | Level 3 [Member] | Real estate investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	1,263	1,405	1,422
Non-US Pension Plans [Member] | Level 3 [Member] | Other investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	722	618	665
Non-US Pension Plans [Member] | Level 3 [Member] | Derivative assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets	0	0
Non-US Pension Plans [Member] | Level 3 [Member] | Derivative liabilities [Member]
Defined Benefit Plan Disclosure [Line Items]
Liabilities	$0	$0

Pensions_And_Other_Postretirem8

Pensions And Other Postretirement Benefits Pension Level 3 Assets rollforward (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
US Pension Plans [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	$63,852
Beginning balance-net assets	63,513
Net Realized / Unrealized Gains (Losses)	7,346	2,107
Effect of Foreign Currency	0	0
Ending balance-gross assets	65,773	63,852
Ending balance-net assets	65,254	63,513
US Pension Plans [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	15,834
Beginning balance-net assets	15,828	15,950
Net Realized / Unrealized Gains (Losses)	1,136	1,945
Purchases, Sales and Settlements, Net	-2,068	-2,067
Transfers Into/Out of Level 3	-6	0
Ending balance-gross assets	14,890	15,834
Ending balance-net assets	14,890	15,828
Change in Unrealized Gains (Losses) Attributable to Assets Held at Balance Sheet Date	304	1,160
US Pension Plans [Member] | Common and preferred stocks [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Ending balance-gross assets	10,066	10,310
US Pension Plans [Member] | Common and preferred stocks [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	6	19
Net Realized / Unrealized Gains (Losses)	2	3
Purchases, Sales and Settlements, Net	-5	-16
Transfers Into/Out of Level 3	0	0
Ending balance-gross assets	3	6
Change in Unrealized Gains (Losses) Attributable to Assets Held at Balance Sheet Date	0	1
US Pension Plans [Member] | Corporate and other debt securities [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Ending balance-gross assets	22,808	20,777
US Pension Plans [Member] | Corporate and other debt securities [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	130	182
Net Realized / Unrealized Gains (Losses)	0	6
Purchases, Sales and Settlements, Net	-41	-58
Transfers Into/Out of Level 3	-6	0
Ending balance-gross assets	83	130
Change in Unrealized Gains (Losses) Attributable to Assets Held at Balance Sheet Date	-4	-3
US Pension Plans [Member] | Investment funds [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Ending balance-gross assets	6,201	6,291
US Pension Plans [Member] | Investment funds [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	5,174	4,959
Net Realized / Unrealized Gains (Losses)	231	552
Purchases, Sales and Settlements, Net	-184	-337
Transfers Into/Out of Level 3	0	0
Ending balance-gross assets	5,221	5,174
Change in Unrealized Gains (Losses) Attributable to Assets Held at Balance Sheet Date	208	537
US Pension Plans [Member] | Private equity and debt investments [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Ending balance-gross assets	5,909	6,335
US Pension Plans [Member] | Private equity and debt investments [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	6,335	6,400
Net Realized / Unrealized Gains (Losses)	651	926
Purchases, Sales and Settlements, Net	-1,077	-991
Transfers Into/Out of Level 3	0	0
Ending balance-gross assets	5,909	6,335
Change in Unrealized Gains (Losses) Attributable to Assets Held at Balance Sheet Date	27	436
US Pension Plans [Member] | Real estate investments [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Ending balance-gross assets	4,170	4,521
US Pension Plans [Member] | Real estate investments [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	4,127	4,335
Net Realized / Unrealized Gains (Losses)	251	458
Purchases, Sales and Settlements, Net	-770	-666
Transfers Into/Out of Level 3	0	0
Ending balance-gross assets	3,608	4,127
Change in Unrealized Gains (Losses) Attributable to Assets Held at Balance Sheet Date	68	190
US Pension Plans [Member] | Other investments [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Ending balance-gross assets	65	62
US Pension Plans [Member] | Other investments [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	62	63
Net Realized / Unrealized Gains (Losses)	5	-2
Purchases, Sales and Settlements, Net	-2	1
Transfers Into/Out of Level 3	0	0
Ending balance-gross assets	65	62
Change in Unrealized Gains (Losses) Attributable to Assets Held at Balance Sheet Date	5	-2
US Pension Plans [Member] | Derivatives [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-net assets	-6	-8
Net Realized / Unrealized Gains (Losses)	-4	2
Purchases, Sales and Settlements, Net	11	0
Transfers Into/Out of Level 3	0	0
Ending balance-net assets	1	-6
Change in Unrealized Gains (Losses) Attributable to Assets Held at Balance Sheet Date	0	1
Non-US Pension Plans [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	14,812
Beginning balance-net assets	14,744
Net Realized / Unrealized Gains (Losses)	1,893	988
Effect of Foreign Currency	-1,232	-692
Ending balance-gross assets	14,727	14,812
Ending balance-net assets	14,683	14,744
Non-US Pension Plans [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Ending balance-gross assets	3,383	3,212
Ending balance-net assets	3,383	3,212
Non-US Pension Plans [Member] | Common and preferred stocks [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Ending balance-gross assets	1,962	1,822
Non-US Pension Plans [Member] | Common and preferred stocks [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Ending balance-gross assets	0	0
Non-US Pension Plans [Member] | Corporate and other debt securities [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Ending balance-gross assets	1,986	2,489
Non-US Pension Plans [Member] | Corporate and other debt securities [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	14	5
Net Realized / Unrealized Gains (Losses)	0	1
Purchases, Sales and Settlements, Net	-13	7
Transfers Into/Out of Level 3	0	1
Effect of Foreign Currency	-1	0
Ending balance-gross assets	0	14
Change in Unrealized Gains (Losses) Attributable to Assets Held at Balance Sheet Date	0	1
Non-US Pension Plans [Member] | Investment funds [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Ending balance-gross assets	4,399	4,402
Non-US Pension Plans [Member] | Investment funds [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	745	641
Net Realized / Unrealized Gains (Losses)	103	110
Purchases, Sales and Settlements, Net	111	27
Transfers Into/Out of Level 3	0	0
Effect of Foreign Currency	-70	-33
Ending balance-gross assets	889	745
Change in Unrealized Gains (Losses) Attributable to Assets Held at Balance Sheet Date	103	112
Non-US Pension Plans [Member] | Private equity and debt investments [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Ending balance-gross assets	509	430
Non-US Pension Plans [Member] | Private equity and debt investments [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	430	381
Net Realized / Unrealized Gains (Losses)	100	73
Purchases, Sales and Settlements, Net	20	3
Transfers Into/Out of Level 3	0	0
Effect of Foreign Currency	-41	-27
Ending balance-gross assets	509	430
Change in Unrealized Gains (Losses) Attributable to Assets Held at Balance Sheet Date	75	53
Non-US Pension Plans [Member] | Real estate investments [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Ending balance-gross assets	1,287	1,430
Non-US Pension Plans [Member] | Real estate investments [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	1,405	1,422
Net Realized / Unrealized Gains (Losses)	48	103
Purchases, Sales and Settlements, Net	-84	-57
Transfers Into/Out of Level 3	0	0
Effect of Foreign Currency	-106	-63
Ending balance-gross assets	1,263	1,405
Change in Unrealized Gains (Losses) Attributable to Assets Held at Balance Sheet Date	44	122
Non-US Pension Plans [Member] | Other investments [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Ending balance-gross assets	722	618
Non-US Pension Plans [Member] | Other investments [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	618	665
Net Realized / Unrealized Gains (Losses)	92	-10
Purchases, Sales and Settlements, Net	72	-43
Transfers Into/Out of Level 3	0	0
Effect of Foreign Currency	-60	6
Ending balance-gross assets	722	618
Change in Unrealized Gains (Losses) Attributable to Assets Held at Balance Sheet Date	76	4
Non-US Pension Plans [Member] | Total assets [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	3,212	3,114
Net Realized / Unrealized Gains (Losses)	343	277
Purchases, Sales and Settlements, Net	106	-63
Transfers Into/Out of Level 3	0	1
Effect of Foreign Currency	-278	-117
Ending balance-gross assets	3,383	3,212
Change in Unrealized Gains (Losses) Attributable to Assets Held at Balance Sheet Date	$298	$292

Pensions_And_Other_Postretirem9

Pensions And Other Postretirement Benefits Benefit Payments (Details) (USD $)	12 Months Ended
	Dec. 31, 2014
US Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Minimum Period Of Time For Which There Are No Significant Mandatory Contributions For Qualified Plans	5 years
Funding Requirements for Upcoming Year for Qualified Plans	$0
2015	5,616,000,000
2016	5,572,000,000
2017	5,380,000,000
2018	5,239,000,000
2019	5,128,000,000
2020 - 2024	23,754,000,000
Non-US Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
2015	1,530,000,000
2016	1,570,000,000
2017	1,558,000,000
2018	1,458,000,000
2019	1,448,000,000
2020 - 2024	7,136,000,000
US OPEB Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
2015	344,000,000
2016	331,000,000
2017	322,000,000
2018	313,000,000
2019	307,000,000
2020 - 2024	1,470,000,000
Non-US OPEB Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
2015	59,000,000
2016	63,000,000
2017	61,000,000
2018	63,000,000
2019	65,000,000
2020 - 2024	$348,000,000

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Automotive [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount	$8,800,000,000	$9,300,000,000
Derivative Liability, Notional Amount	953,000,000	427,000,000
GM Financial [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount	5,400,000,000	5,500,000,000
Derivative Liability, Notional Amount	$8,500,000,000	$7,600,000,000

Commitments_and_Contingencies_1

Commitments and Contingencies Guarantees (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Third party Commercial Loans and other Obligations [Member]
Guarantor Obligations [Line Items]
Liability Recorded	$37	$51
Maximum Liability	197	15,616
Guarantees of Product-Related Claims [Member]
Guarantor Obligations [Line Items]
Liability Recorded	51	54
Maximum Liability	2,458	1,317
Ally Financial [Member] | Third party Commercial Loans and other Obligations [Member]
Guarantor Obligations [Line Items]
Liability Recorded		10
Maximum Liability		$15,300

Commitments_and_Contingencies_2

Commitments and Contingencies Loss Contingencies (Details)

12 Months Ended

1 Months Ended

12 Months Ended

9 Months Ended

1 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

13 Months Ended

13 Months Ended

4 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Oct. 31, 2012

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Oct. 14, 2014

Feb. 28, 2010

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Jan. 30, 2015

Jan. 30, 2015

Jan. 30, 2015

Jan. 30, 2015

Jan. 30, 2015

Jan. 30, 2015

Jan. 30, 2015

Oct. 13, 2014

Dec. 31, 2014

Oct. 09, 2014

USD ($)

USD ($)

BRAZIL

Minimum [Member]

Maximum [Member]

Ignition Switch Recall Litigations [Member]

Ignition Switch Recall Litigations [Member]

GMCL Dealer Litigation [Member]

GMCL Dealer Litigation [Member]

GMCL Dealer Litigation [Member]

UAW Lawsuit [Member]

Korea Wage Litigation - Hourly [Member]

Korea Wage Litigation - Hourly [Member]

Korea Wage Litigation - Salaried [Member]

Korea Wage Litigation - Salaried [Member]

Recalls - Ignition Switch [Member]

Ignition Switch Recall Compensation Program [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Consolidated Litigation [Member]

Consolidated Litigation [Member]

Consolidated Litigation [Member]

USD ($)

USD ($)

NEW YORK

CAD

USD ($)

USD ($)

USD ($)

KRW

USD ($)

KRW

USD ($)

Ignition Switch Recall Litigations [Member]

Ignition Switch Recall Litigations - Economic Damage [Member]

Ignition Switch Recall Litigations - Economic Damage [Member]

Ignition Switch Recall Litigations - Injury or Death [Member]

Ignition Switch Recall Litigations - Concealment of Information [Member]

Ignition Switch Recall Litigations - Concealment of Information [Member]

Ignition Switch Recall Compensation Program [Member]

Ignition Switch Recall Litigations, Shareholder Derivative Action [Member]

Ignition Switch Recall Litigations, Shareholder Derivative Action [Member]

Ignition Switch Recall Litigations, Shareholder Derivative Action [Member]

employee

employee

NEW YORK

U.S.

CANADA

U.S.

NEW YORK

CALIFORNIA

USD ($)

DELAWARE

MICHIGAN

MICHIGAN

Loss Contingencies [Line Items]

Other Litigation Liability and Tax Administrative Matters

$1,000,000,000

$1,227,000,000

$0

Accrual for ignition switch recall compensation program

315,000,000

Credit Card Redemption liability

87,000,000

183,000,000

Credit Card Deferred revenue

263,000,000

295,000,000

Asset Retirement Obligation

146,000,000

159,000,000

Credit Card Programs Available Rebate

2,300,000,000

2,600,000,000

Indirect Tax-Related Escrow Deposit

500,000,000

700,000,000

Pending Claims, Number

108

20

104

2

3,810

4

2

2

Number of Claims Transferred

156

1

Number of Consolidated Claims

2

State Attorneys General, Number

49

Number of Plaintiffs

200

181

10,000

10,000

Damage Sought, Value

750,000,000

450,000,000

Number Of Group Actions

8

8

Number of Employee in the Case

5

5

Vehicles recalled

42,000,000

2,600,000

Range of Possible Loss, Portion Not Accrued

511,000,000

562,000,000,000

149,000,000

164,000,000,000

200,000,000

Eligible Claims, Number

128

Payments of Ignition Switch Recall Compensation Program

$93,000,000

Increase in Excise Tax Rate

30.00%

Commitments_and_Contingencies_3

Commitments and Contingencies Loss Contingencies Product Liability And Environmental Liability (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Loss Contingencies Product Liability And Environmental Liability [Line Items]
Product Liability	$732	$690
Environmental Liability	133	154
Environmental Remediation Years of Cost to Incur, Min	5 years
Environmental Remediation Years of Cost to Incur, Max	30 years
Minimum [Member]
Loss Contingencies Product Liability And Environmental Liability [Line Items]
Indirect Tax-Related Escrow Deposit	500
Environmental Remediation Losses	110
Maximum [Member]
Loss Contingencies Product Liability And Environmental Liability [Line Items]
Indirect Tax-Related Escrow Deposit	700
Environmental Remediation Losses	$210

Commitments_and_Contingencies_4

Commitments and Contingencies Noncancelable Operating Leases (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
Future Minimum Payments, 2015	$348
Future Minimum Payments, 2016	280
Future Minimum Payments, 2017	196
Future Minimum Payments, 2018	171
Future Minimum Payments, 2019	144
Future Minimum Payments, Thereafter	396
Sublease income, 2015	-53
Sublease income, 2016	-62
Sublease income, 2017	-59
Sublease income, 2018	-56
Sublease income, 2019	-54
Sublease Income, thereafter	-248
Net minimum commitment, 2015	295
Net minimum commitment, 2016	218
Net minimum commitment, 2017	137
Net minimum commitment, 2018	115
Net minimum commitment, 2019	90
Net minimum commitment, thereafter	148
Operating Leases, Rent Expense, Net	$444	$477	$474

Income_Taxes_Pretax_income_and

Income Taxes Pre-tax income and income tax expense (benefit) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income (loss) before income taxes and equity income	$2,152,000,000	$5,648,000,000	($30,257,000,000)
Basis Difference Related to Fair Value Changes	4,100,000,000	4,100,000,000
Basis Differences Resulting from Indefinitely Reinvested Earnings	3,000,000,000	2,600,000,000
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current Federal Tax Expense (Benefit)	-23,000,000	-34,000,000	6,000,000
Current State and Local Tax Expense (Benefit)	154,000,000	88,000,000	78,000,000
Current Foreign Tax Expense (Benefit)	671,000,000	512,000,000	646,000,000
Current Income Tax Expense (Benefit)	802,000,000	566,000,000	730,000,000
Deferred Federal Income Tax Expense (Benefit)	-581,000,000	1,049,000,000	-28,965,000,000
Deferred State and Local Income Tax Expense (Benefit)	-60,000,000	137,000,000	-3,415,000,000
Deferred Foreign Income Tax Expense (Benefit)	67,000,000	375,000,000	-3,181,000,000
Deferred Income Tax Expense (Benefit)	-574,000,000	1,561,000,000	-35,561,000,000
Income Tax Expense (Benefit)	228,000,000	2,127,000,000	-34,831,000,000
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income tax expense (benefit) at U.S. federal statutory income tax rate	753,000,000	1,977,000,000	-10,590,000,000
State and local tax expense	73,000,000	145,000,000	254,000,000
Non-U.S. income taxed at other than 35%	-72,000,000	-168,000,000	908,000,000
Foreign Tax Credit Election Change	0	0	-1,075,000,000
U.S. Tax on Non-U.S. Income	-8,000,000	543,000,000	713,000,000
Change in valuation allowance	-402,000,000	182,000,000	-33,917,000,000
Change in Tax Laws	602,000,000	146,000,000	67,000,000
Research Incentives	-279,000,000	-490,000,000	-68,000,000
Goodwill Impairment	41,000,000	124,000,000	8,705,000,000
Settlements of Prior Year Tax Matters	-275,000,000	-473,000,000	0
Realization of Basis Differences in Affiliates	-256,000,000	0	0
Foreign Currency Remeasurement	124,000,000	-21,000,000	-36,000,000
U.S. salaried pension plan settlement	0	0	541,000,000
Other Adjustments	-73,000,000	162,000,000	-333,000,000
U.S.
Income (loss) before income taxes and equity income	1,683,000,000	4,880,000,000	-19,063,000,000
Non-U.S.
Income (loss) before income taxes and equity income	$469,000,000	$768,000,000	($11,194,000,000)

Income_Taxes_Income_Tax_Assets

Income Taxes Income Tax Assets and Liabilities (Details) (USD $)	12 Months Ended	1 Months Ended
	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013
Deferred income tax assets and liabilities [Line Items]
Postretirement Benefits Other Than Pensions			$2,958,000,000	$2,902,000,000
Pensions and Other Employee Benefit Plans			7,503,000,000	5,469,000,000
Warranties, Dealer and Customer Allowances, Claims and Discounts			5,512,000,000	4,282,000,000
Property, Plants and Equipment			2,323,000,000	2,464,000,000
Capitalized Research Expenditures			8,588,000,000	7,179,000,000
Operating Loss and Tax Credit Carryforwards			14,136,000,000	19,342,000,000
Miscellaneous			3,286,000,000	1,663,000,000
Deferred Tax Assets, Gross			44,306,000,000	43,301,000,000
Total Deferred Tax Assets			34,647,000,000	32,478,000,000
Intangible Assets			416,000,000	397,000,000
Net Deferred Tax Assets			34,231,000,000	32,081,000,000
Operating Loss and Tax Credit Carryforwards Subject to Expiration			8,900,000,000
Operating Loss and Tax Credit Carryforwards Not Subject to Expiration			5,200,000,000
Valuation Allowance			-9,659,000,000	-10,823,000,000
Reversal of Valuation Allowance	-36,364,000,000
EUROPE
Deferred income tax assets and liabilities [Line Items]
Valuation Allowance			-4,900,000,000
U.S.
Deferred income tax assets and liabilities [Line Items]
Reversal of Valuation Allowance		-33,200,000,000
CANADA
Deferred income tax assets and liabilities [Line Items]
Reversal of Valuation Allowance		($3,100,000,000)

Income_Taxes_Uncertain_Tax_Pos

Income Taxes Uncertain Tax Positions (Details) (USD $)	1 Months Ended	12 Months Ended
	Nov. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Unrecognized Tax Benefits [Roll Forward]
Unrecognized Tax Benefits - Beginning Balance		$2,530,000,000	$2,745,000,000	$2,370,000,000
Additions to Current Year Tax Positions		184,000,000	251,000,000	112,000,000
Additions to Prior Year Tax Positions		149,000,000	276,000,000	512,000,000
Reductions to Prior Year Tax Positions		-603,000,000	-535,000,000	-141,000,000
Reductions in Tax Positions due to Lapse of Statutory Limitations		-164,000,000	-73,000,000	-34,000,000
Settlements		-138,000,000	-132,000,000	-112,000,000
Other		-81,000,000	-2,000,000	38,000,000
Unrecognized Tax Benefits - Ending Balance		1,877,000,000	2,530,000,000	2,745,000,000
Unrecognized Tax Benefit that Would Favorably Affect Effective Tax Rate in Future		1,200,000,000	1,500,000,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued		246,000,000	286,000,000
Income Tax Settlement	473,000,000
Tax Benefit from Prior Year Research Credits			$200,000,000

Restructuring_And_Other_Initia2

Restructuring And Other Initiatives (Details) (USD $)	12 Months Ended			3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2013	Mar. 31, 2012
					employees	employees
Restructuring Reserve [Roll Forward]
Beginning Balance	$1,349	$1,320	$1,584
Additions, interest accretion and other	1,013	714	570
Payments	-862	-660	-749
Revisions to estimates and effect of foreign currency	-122	-25	-85
Ending Balance	1,378	1,349	1,320	1,320	1,349
Impairment of Intangible Assets, Finite-lived	16	523	1,755
Property, Plant and Equipment [Member]
Restructuring Reserve [Roll Forward]
Tangible Asset Impairment Charges	709	901	3,793
GMNA [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	497	653	884
Additions, interest accretion and other	42	58	140
Payments	-96	-182	-304
Revisions to estimates and effect of foreign currency	16	-32	-67
Ending Balance	459	497	653	653	497
Remaining Payments Including Temporary Layoffs Benefits	354	353	356	356	353
GMNA [Member] | 2011 UAW Labor Agreement [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Cost Incurred to Date						99
Employees Affected, Inception to Date						1,400
GME [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	503	590	687
Additions, interest accretion and other	675	202	254
Payments	-329	-299	-344
Revisions to estimates and effect of foreign currency	-98	10	-7
Ending Balance	751	503	590	590	503
Impairment of Intangible Assets, Finite-lived				1,800
GME [Member] | Property, Plant and Equipment [Member]
Restructuring Reserve [Roll Forward]
Tangible Asset Impairment Charges	179
GME [Member] | Automotive Cost of Sales [Member] | Property, Plant and Equipment [Member]
Restructuring Reserve [Roll Forward]
Tangible Asset Impairment Charges				3,700
GME [Member] | Germany Separation Programs [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Cost Incurred to Date	841	194	310	310	194
Employees Affected, Inception to Date	3,560	450			450
GME [Member] | Germany and UK Separation Programs [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Cost Incurred to Date			400	400
Employees Affected, Inception to Date			2,550	2,550
GMIO [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	333	39	1
Additions, interest accretion and other	213	404	84
Payments	-342	-111	-46
Revisions to estimates and effect of foreign currency	-38	1	0
Ending Balance	166	333	39	39	333
GMIO [Member] | Property, Plant and Equipment [Member]
Restructuring Reserve [Roll Forward]
Tangible Asset Impairment Charges	321
GMIO [Member] | Separation Programs in Australia, Korea, and Chevrolet Europe [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Cost Incurred to Date	514	420			420
Employees Affected, Inception to Date	3,380	4,100			4,100
Expected Cost Remaining	270
GMIO [Member] | Korea and Australia Separation Program [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Cost Incurred to Date			69	69
Employees Affected, Inception to Date			650	650
GMIO [Member] | Withdrawal of the Chevrolet Brand from Europe [Member]
Restructuring Reserve [Roll Forward]
Employees Affected, Inception to Date		480			480
Number of Dealers and Distributors Impacted, Inception to Date		1,200			1,200
Cost Related to Business Withdrawal					636
Noncontrolling Interest Adjustments					124
Sales Incentive and Inventory Related Costs					233
GMIO [Member] | Withdrawal of the Chevrolet Brand from Europe [Member] | Dealer Restructuring Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Cost Incurred to Date		233			233
GMIO [Member] | Withdrawal of the Chevrolet Brand from Europe [Member] | Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Cost Incurred to Date		30			30
GMIO [Member] | Holden Manufacturing Operations [Member]
Restructuring Reserve [Roll Forward]
Employees Affected, Inception to Date		2,900			2,900
GMIO [Member] | Holden Manufacturing Operations [Member] | Automotive Cost of Sales [Member]
Restructuring Reserve [Roll Forward]
Cost Related to Business Withdrawal					536
GMIO [Member] | Holden Manufacturing Operations [Member] | Automotive Cost of Sales [Member] | Property, Plant and Equipment [Member]
Restructuring Reserve [Roll Forward]
Tangible Asset Impairment Charges		477
GMIO [Member] | Holden Manufacturing Operations [Member] | Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Cost Incurred to Date		59			59
GMSA [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	16	38	12
Additions, interest accretion and other	83	50	92
Payments	-95	-68	-55
Revisions to estimates and effect of foreign currency	-2	-4	-11
Ending Balance	2	16	38	38	16
GMSA [Member] | Separation Program in Brazil and Venezuela [Domain]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Cost Incurred to Date	169
GMSA [Member] | Separation Program in Brazil [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Cost Incurred to Date		$103	$87	$87	$103

Interest_Income_and_Other_NonO2

Interest Income and Other Non-Operating Income, net (Details) (USD $)	12 Months Ended			1 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013
Interest Income	$211	$246	$343
Net gains (losses) on derivatives	48	-13	-63
Dividends and royalties	101	97	98
Foreign currency transaction and remeasurement gains (losses)	378	-154	16
Gains (losses) on securities and other investments - realized and unrealized	13	691	-193
Deferred income from technology agreements	0	100	114
Other	72	96	530
Total interest income and other non-operating income, net	823	1,063	845
Ally Financial [Member]
Cost-method Investments, Realized Gains				483
Ally Financial [Member] | Common Stock [Member]
Proceeds from Sale of Other Investments				$880

Stockholders_Equity_and_Noncon2

Stockholders' Equity and Noncontrolling Interests Preferred and Common Stock (Details) (USD $)	12 Months Ended			1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014	Dec. 31, 2012	Dec. 02, 2013
	Votes
Class of Stock [Line Items]
Preferred Stock, Shares Authorized	2,000,000,000			2,000,000,000
Common Stock, Shares Authorized	5,000,000,000			5,000,000,000
Common Stock, Shares, Issued	1,600,000,000	1,500,000,000		1,600,000,000		1,500,000,000
Common Stock, Shares, Outstanding	1,600,000,000	1,500,000,000		1,600,000,000		1,500,000,000
Common Stock Dividend per Annum	$1.20
Dividends Paid, Common Shares	$1,928,000,000	$0	$0
Common Stock Voting Rights Number of Votes per Share	1			1
Stock Repurchased During Period, Equity Impact			5,109,000,000
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Issued	0	156,000,000		0		156,000,000
Preferred Stock, Shares Outstanding	0	156,000,000		0		156,000,000
Liquidation Preference Per Share	$25			$25
Preferred Stock Dividend per Annum	9.00%
Dividends Paid, Preferred Shares	1,160,000,000	1,370,000,000	621,000,000
Payments for Repurchase of Preferred Stock				3,900,000,000	3,200,000,000
Charges related to preferred shares redemption				809,000,000	816,000,000
Stock Redeemed or Called During Period, Shares					120,000,000
Percent of Preferred Stock Purchased to Shares Outstanding					43.50%
Percent Of Liquidation Amount					108.10%
Series B Preferred Stock [Member]
Class of Stock [Line Items]
Liquidation Preference Per Share		$50				$50
Preferred Stock Dividend per Annum		4.75%
Dividends Paid, Preferred Shares		237,000,000	238,000,000
Conversion of Stock, Shares Converted						100,000,000
Conversion Rate of Preferred Stock to Common									1.3736
Shares Issued Upon Conversion of Preferred Stock						137,000,000
Common Stock Trading Days		40 days
Common Stock [Member]
Class of Stock [Line Items]
Common Shares Repurchased During Period							5,000,000
Stock Repurchased During Period, Shares								200,000,000
Stock Repurchased During Period, Price per Share							$33.69	$27.50
Purchase and Retirement of Common Stock								5,500,000,000
Share Price Prior to Common Stock Repurchase								$25.49
Stock Repurchased During Period, Equity Impact			2,000,000					5,100,000,000
Premium Paid on Repurchase of Common Stock								$402,000,000
Shares issued for the settlement of restricted stock and salary stock awards			1,300,000
Shares issued for exercised warrants			400,000

Stockholders_Equity_and_Noncon3

Stockholders' Equity and Noncontrolling Interests Warrants (Details) (USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2009
Class of Warrant or Right [Line Items]
Warrant, Outstanding	165	293
MLC Warrants [Member]
Class of Warrant or Right [Line Items]
Number Of Traunches of Warrants Issued			2
Number of Common Stocks Called by Warrants or Rights			136
First Traunche of Warrants [Member]
Class of Warrant or Right [Line Items]
Number of Common Stocks Called by Warrants or Rights			136
Warrants Expiration Date	10-Jul-16
Exercise Price of Warrants	$10
Second Traunche of Warrants [Member]
Class of Warrant or Right [Line Items]
Number of Common Stocks Called by Warrants or Rights			136
Warrants Expiration Date	10-Jul-19
Exercise Price of Warrants	$18.33
New VEBA [Member]
Class of Warrant or Right [Line Items]
Number Of Traunches of Warrants Issued			1
Number of Common Stocks Called by Warrants or Rights			46
Warrants Expiration Date	31-Dec-15
Exercise Price of Warrants	$42.31

Stockholders_Equity_and_Noncon4

Stockholders' Equity and Noncontrolling Interests Accumulated Other Comprehensive Income (Loss) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, beginning balance	($3,113)
Other comprehensive income (loss), net of tax	-4,983	4,921	-2,180
AOCI, ending balance	-8,073	-3,113
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, beginning balance	-614	101	215
Other Comprehensive Income (Loss), before Tax	-477	-722	-103
Tax Expense (Benefit)	-4	11	0
Other comprehensive income (loss), net of tax	-473	-733	-103
Other Comprehensive (Income) Loss Attributable to Noncontrolling Interests, Net of Tax	23	18	-11
AOCI, ending balance	-1,064	-614	101
Unrealized Gain (Loss) on Securities, net [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, beginning balance	2	41	-4
Other Comprehensive Income (Loss), before Reclassification Adjustment, before Tax	-2	133	-140
Tax expense (benefit), before reclassification adjustment	-1	-6	22
Other Comprehensive Income (Loss), before Reclassification Adjustment, Net of Tax	-1	139	-162
Reclassification Adjustment, before Tax	-7	-185	202
Tax expense (benefit), Reclassification Adjustment	-3	-7	-5
Reclassification adjustment, net of tax	-4	-178	207
Other comprehensive income (loss), net of tax	-5	-39	45
AOCI, ending balance	-3	2	41
Defined Benefit Plans, Net [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, beginning balance	-2,501	-8,194	-6,074
Other comprehensive income (loss) before reclassification adjustment - prior service cost or credit, before tax	-20	6	-53
Other comprehensive income (loss) before reclassification adjustment - actuarial gains or losses, before tax	-6,457	8,673	-3,180
Tax expense (benefit), before reclassification adjustment	-1,854	3,087	-1,021
Other Comprehensive Income (Loss), before Reclassification Adjustment, Net of Tax	-4,623	5,592	-2,212
Reclassification adjustment - prior service cost or credit, before tax	22	-128	-125
Reclassification adjustment - actuarial gains or losses, before tax	76	178	229
Tax expense (benefit), Reclassification Adjustment	-20	-51	12
Reclassification adjustment, net of tax	118	101	92
Other comprehensive income (loss), net of tax	-4,505	5,693	-2,120
AOCI, ending balance	($7,006)	($2,501)	($8,194)

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Basic Earnings per Common Share
Net income (loss) attributable to stockholders	$1,987	$1,471	$278	$213	$1,040	$1,717	$1,414	$1,175	$3,949	$5,346	$6,188
Less: cumulative dividends on preferred stock and charge related to redemption and purchase of preferred stock									-1,145	-1,576	-859
Net income (loss) attributable to common stockholders									2,804	3,770	4,859
Weighted-average common shares outstanding - basic									1,605	1,393	1,566
Basic earnings per common share	$0.69	$0.86	$0.12	$0.08	$0.64	$0.50	$0.87	$0.63	$1.75	$2.71	$3.10
Earnings Per Share, Diluted [Abstract]
Net income (loss) attributable to stockholders	1,987	1,471	278	213	1,040	1,717	1,414	1,175	3,949	5,346	6,188
Less: cumulative dividends on preferred stock and charge related to redemption and purchase of preferred stock									-1,145	-1,576	-859
Less: earnings adjustment for dilutive stock compensation rights									-18
Net income (loss) attibutable to common stockholders									2,786	3,988	4,887
Diluted Earnings per Common Share	$0.66	$0.81	$0.11	$0.06	$0.57	$0.45	$0.75	$0.58	$1.65	$2.38	$2.92
Weighted Average Common Shares Outstanding - Diluted [Abstract]
Weighted-average common shares outstanding - basic									1,605	1,393	1,566
Dilutive effect of warrants and RSUs									82	149	109
Weighted-average common shares outstanding - diluted									1,687	1,676	1,675
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]
Lower share price boundary for two class method										$33	$33
Higher share price boundary for two class method										$39.60	$39.60
Warrants excluded from computation of diluted EPS (shares)									46	46	46
Series A Preferred Stock [Member]
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]
Earned But Undeclared Dividends										15	26
Series B Preferred Stock [Member]
Basic Earnings per Common Share
Less: undistributed earnings allocated to Series B preferred stock participating security										0	-470
Earnings Per Share, Diluted [Abstract]
Add: preferred dividends to holders of Series B Preferred Stock										218	0
Less: undistributed earnings allocated to Series B Preferred Stock participating security										0	-442
Weighted Average Common Shares Outstanding - Diluted [Abstract]
Dilutive effect of conversion of Series B Preferred Stock										134	0
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]
Earned But Undeclared Dividends											$20
Assumed change of method impact to earnings per share										$0.13
Common stock equivalents not considered outstanding											152

Stock_Incentive_Plans_Details

Stock Incentive Plans (Details) (USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Incentive Plans Narratives [Abstract]
Aggregate Number of Shares Authorized Under LTIP	60
Share-based Compensation Expense	$245	$311	$302
Income Tax Benefit	81	100	100
Unrecognized Compensation Expense for Nonvested Equity Awards	247
Weighted-average period for total unrecognized compensation expense for nonvested equity awards	1 year 6 months
Restricted Stock Units (RSUs) [Member]
Stock Incentive Plans Narratives [Abstract]
RSUs Settled with Cash Payments	2.4	3.1	1.6
Cash Used to Settle RSUs	85	94	36
RSU and PSU Shares [Abstract]
Granted	8	7	7
Performance Shares Units (PSUs) [Member]
RSU and PSU Shares [Abstract]
Granted	4
RSUs and PSUs [Member]
Stock Incentive Plans Narratives [Abstract]
Fair Value of Vested RSUs and PSUs	$221	$342	$141
RSU and PSU Shares [Abstract]
Outstanding, Beginning of Period	18.6
Granted	12.1
Settled	-9.3
Forfeited or expired	-1.5
Outstanding, End of Period	19.9	18.6
Unvested and Expected to Vest	12.7
Vested and Payable	6.7
RSU and PSU Weighted Average Grant Date Fair Value (Per Share) [Roll Forward]
Weighted Average Grant Date Fair Value, Outstanding, Beginning of Period	$27.76
Weighted Average Grant Date Fair Value, Granted	$35.31	$29.05	$25.10
Weighted Average Grant Date Fair Value, Settled	$27.85
Weighted Average Grant Date Fair Value, Forfeited or Expired	$30.39
Weighted Average Grant Date Fair Value, Outstanding, End of Period	$32.11	$27.76
Weighted-average grant date fair value unvested and expected to vest	$32.91
Weighted Average Grant Date Fair Value Vested and Payable	$30.49
Remaining Contractual Term [Abstract]
Weighted Average Remaining Contractual Terms, Outstanding	1 year 4 months	1 year 2 months
Weighted Average Remaining Contractual Terms Unvested and Expected to Vest	1 year 6 months

Supplementary_Quarterly_Financ2

Supplementary Quarterly Financial Information (Unaudited) (Details) (USD $)	1 Months Ended	3 Months Ended								12 Months Ended			1 Months Ended	6 Months Ended	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Nov. 30, 2013	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2012
Total net sales and revenue		$39,617	$39,255	$39,649	$37,408	$40,485	$38,983	$39,075	$36,884	$155,929	$155,427	$152,256
Net income		2,009	1,442	287	280	1,053	1,705	1,388	1,185	4,018	5,331	6,136
Net income (loss) attributable to stockholders		1,987	1,471	278	213	1,040	1,717	1,414	1,175	3,949	5,346	6,188
Basic earnings per common share		$0.69	$0.86	$0.12	$0.08	$0.64	$0.50	$0.87	$0.63	$1.75	$2.71	$3.10
Diluted earnings per common share		$0.66	$0.81	$0.11	$0.06	$0.57	$0.45	$0.75	$0.58	$1.65	$2.38	$2.92
(Gains) losses on extinguishment of debt										-202	212	250
Charges related to our plans to cease mainstream distribution of Chevrolet brand in Europe										154,399	150,296	182,619
Goodwill impairment charges										120	541	27,145
Income Tax Settlement	-473
Ally Financial [Member]
Cost-method Investments, Realized Gains													483
Ignition Switch Recall Compensation Program [Member]
Charge related to ignition switch recall compensation program				400
Corporate, Non-Segment [Member]
Income Tax Settlement						473
Corporate, Non-Segment [Member] | Ally Financial [Member]
Cost-method Investments, Realized Gains						483
Corporate, Non-Segment [Member] | Ignition Switch Recall Compensation Program [Member]
Charge related to ignition switch recall compensation program				400
GMIO [Member]
Goodwill impairment charges						481
GMIO [Member] | Thailand [Member]
Tangible Asset Impairment Charges		158
GMIO [Member] | Withdrawal of the Chevrolet Brand from Europe [Member]
Charges related to our plans to cease mainstream distribution of Chevrolet brand in Europe						745
GMIO [Member] | GM Korea [Member]
(Gains) losses on extinguishment of debt								-240
Gain Related to Litigation Settlement						846
GMIO [Member] | Holden and GM India [Member]
Asset Impairment Charges						805
GMSA [Member] | BRAZIL
(Gains) losses on extinguishment of debt		207
GMSA [Member] | VENEZUELA
Venezuela Currency Devaluation charges					419				162
GME [Member] | RUSSIAN
Asset Impairment Charges			194
GME [Member] | PSA [Member]
Gain on Sale of Investments						152
GMNA [Member]
Recall campaign and courtesy transportation charges				1,100	1,300
GMNA [Member] | Warranty Obligations [Member]
Recall campaigns catch-up adjustment				874										200
Automotive [Member]
Automotive gross margin		4,266	3,945	2,611	2,188	4,070	4,954	4,416	3,727
(Gains) losses on extinguishment of debt										-202	212	250
Goodwill impairment charges										120	541
Automotive [Member] | GMIO [Member]
Goodwill impairment charges											541	156
Automotive [Member] | GMSA [Member]
Goodwill impairment charges										120
Automotive [Member] | GME [Member]
Goodwill impairment charges												590
Automotive [Member] | GMNA [Member]
Goodwill impairment charges															$26,400

Segment_Reporting_Summarize_ke

Segment Reporting Summarize key financial information by segment (Details) (USD $)	3 Months Ended								12 Months Ended			6 Months Ended	3 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2012
Revenue and others for Reportable Segment [Abstract]
Net sales and revenue									$151,092,000,000	$152,092,000,000	$150,295,000,000
GM Financial revenue									4,837,000,000	3,335,000,000	1,961,000,000
Total	39,617,000,000	39,255,000,000	39,649,000,000	37,408,000,000	40,485,000,000	38,983,000,000	39,075,000,000	36,884,000,000	155,929,000,000	155,427,000,000	152,256,000,000
Income (loss) before interest and taxes adjusted									6,494,000,000	8,578,000,000	7,859,000,000
Adjustments									-2,327,000,000	-805,000,000	-36,106,000,000
Interest Income									211,000,000	246,000,000	343,000,000
Automotive interest expense									-1,829,000,000	-1,049,000,000	-772,000,000
Gain (loss) on extinguishment of debt									202,000,000	-212,000,000	-250,000,000
Net Income (Loss) Attributable to Noncontrolling Interest									69,000,000	-15,000,000	-52,000,000
Income (loss) before income taxes									4,246,000,000	7,458,000,000	-28,695,000,000
Equity in net assets of nonconsolidated affiliates	8,350,000,000				8,094,000,000				8,350,000,000	8,094,000,000	6,883,000,000	8,350,000,000	6,883,000,000
Total Assets	177,677,000,000				166,344,000,000				177,677,000,000	166,344,000,000	149,422,000,000	177,677,000,000	149,422,000,000
Expenditures for property									7,091,000,000	7,565,000,000	8,068,000,000
Depreciation, amortization and impairment of long-lived assets and finite-lived intangible assets									7,118,000,000	7,500,000,000	11,617,000,000
Equity income (loss)									2,094,000,000	1,810,000,000	1,562,000,000
Valuation Allowance against deferred tax assets											-36,364,000,000
Goodwill, Impairment Loss									120,000,000	541,000,000	27,145,000,000
Intangible Assets Impairment Charges									16,000,000	523,000,000	1,755,000,000
Valuation Allowance Charge (Release)											-36,500,000,000
New Valuation Allowance											100,000,000
Property, Plant and Equipment [Member]
Revenue and others for Reportable Segment [Abstract]
Tangible Asset Impairment Charges									709,000,000	901,000,000	3,793,000,000
Ignition Switch Recall Compensation Program [Member]
Revenue and others for Reportable Segment [Abstract]
Loss Contingency Accrual Provision			400,000,000
GMNA [Member] | Warranty Obligations [Member]
Revenue and others for Reportable Segment [Abstract]
Recall campaigns catch-up adjustment			874,000,000									200,000,000
GME [Member]
Revenue and others for Reportable Segment [Abstract]
Intangible Assets Impairment Charges													1,800,000,000
GME [Member] | Property, Plant and Equipment [Member]
Revenue and others for Reportable Segment [Abstract]
Tangible Asset Impairment Charges									179,000,000
GME [Member] | RUSSIAN
Revenue and others for Reportable Segment [Abstract]
Asset Impairment Charges		194,000,000
GMIO [Member]
Revenue and others for Reportable Segment [Abstract]
Goodwill, Impairment Loss					481,000,000
GMIO [Member] | Property, Plant and Equipment [Member]
Revenue and others for Reportable Segment [Abstract]
Tangible Asset Impairment Charges									321,000,000
GMIO [Member] | GM Korea [Member]
Revenue and others for Reportable Segment [Abstract]
Gain (loss) on extinguishment of debt							240,000,000
GMIO [Member] | Withdrawal of the Chevrolet Brand from Europe [Member]
Revenue and others for Reportable Segment [Abstract]
Cost Related to Chevrolet Withdrawal					636,000,000
GMIO [Member] | Thailand [Member]
Revenue and others for Reportable Segment [Abstract]
Tangible Asset Impairment Charges	158,000,000
GMSA [Member] | VENEZUELA
Revenue and others for Reportable Segment [Abstract]
Venezuela Currency Devaluation charges				419,000,000				162,000,000
Corporate, Non-Segment [Member] | Ignition Switch Recall Compensation Program [Member]
Revenue and others for Reportable Segment [Abstract]
Loss Contingency Accrual Provision			400,000,000
Automotive [Member]
Revenue and others for Reportable Segment [Abstract]
Interest Income									211,000,000	246,000,000	343,000,000
Automotive interest expense									-403,000,000	-334,000,000	-489,000,000
Gain (loss) on extinguishment of debt									202,000,000	-212,000,000	-250,000,000
Goodwill, Impairment Loss									120,000,000	541,000,000
Automotive [Member] | GMNA [Member]
Revenue and others for Reportable Segment [Abstract]
Valuation Allowance against deferred tax assets											36,200,000,000
Goodwill, Impairment Loss													26,400,000,000
Automotive [Member] | GME [Member]
Revenue and others for Reportable Segment [Abstract]
Goodwill, Impairment Loss											590,000,000
Automotive [Member] | GMIO [Member]
Revenue and others for Reportable Segment [Abstract]
Goodwill, Impairment Loss										541,000,000	156,000,000
Automotive [Member] | GMSA [Member]
Revenue and others for Reportable Segment [Abstract]
Goodwill, Impairment Loss									120,000,000
Automotive [Member] | Intersegment Eliminations [Member]
Revenue and others for Reportable Segment [Abstract]
Equity in net assets of nonconsolidated affiliates	0				0				0	0	0	0	0
Total Assets	-29,041,000,000				-29,252,000,000				-29,041,000,000	-29,252,000,000	-16,927,000,000	-29,041,000,000	-16,927,000,000
Expenditures for property									0	5,000,000	-4,000,000
Depreciation, amortization and impairment of long-lived assets and finite-lived intangible assets									-4,000,000	-1,000,000	-1,000,000
Equity income (loss)									0	0	0
Valuation Allowance against deferred tax assets											0
GM Financial [Member]
Revenue and others for Reportable Segment [Abstract]
Goodwill, Impairment Loss									0	0
Group [Member] | Operating Segments [Member]
Revenue and others for Reportable Segment [Abstract]
Other Adjustments									10,000,000
Insurance Recoveries										35,000,000
Group [Member] | Automotive [Member] | Operating Segments [Member]
Revenue and others for Reportable Segment [Abstract]
Net sales and revenue									151,092,000,000	152,092,000,000	150,295,000,000
GM Financial revenue									0	0	0
Total									151,092,000,000	152,100,000,000	150,293,000,000
Income (loss) before interest and taxes adjusted									5,696,000,000	7,680,000,000	7,116,000,000
Adjustments									-2,339,000,000	-790,000,000	-36,106,000,000
Equity in net assets of nonconsolidated affiliates	8,350,000,000				8,094,000,000				8,350,000,000	8,094,000,000	6,883,000,000	8,350,000,000	6,883,000,000
Total Assets	131,734,000,000				130,050,000,000				131,734,000,000	130,050,000,000	133,744,000,000	131,734,000,000	133,744,000,000
Expenditures for property									7,039,000,000	7,549,000,000	8,055,000,000
Depreciation, amortization and impairment of long-lived assets and finite-lived intangible assets									6,200,000,000	7,012,000,000	11,402,000,000
Equity income (loss)									2,094,000,000	1,810,000,000	1,562,000,000
Valuation Allowance against deferred tax assets											-36,261,000,000
Group [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member]
Revenue and others for Reportable Segment [Abstract]
Net sales and revenue									101,199,000,000	95,091,000,000	89,912,000,000
GM Financial revenue									0	0	0
Total									101,199,000,000	95,099,000,000	89,910,000,000
Income (loss) before interest and taxes adjusted									6,603,000,000	7,461,000,000	6,470,000,000
Adjustments									-975,000,000	-100,000,000	-29,052,000,000
Equity in net assets of nonconsolidated affiliates	88,000,000				74,000,000				88,000,000	74,000,000	65,000,000	88,000,000	65,000,000
Total Assets	92,864,000,000				87,978,000,000				92,864,000,000	87,978,000,000	87,100,000,000	92,864,000,000	87,100,000,000
Expenditures for property									4,985,000,000	5,466,000,000	4,766,000,000
Depreciation, amortization and impairment of long-lived assets and finite-lived intangible assets									4,376,000,000	4,216,000,000	3,663,000,000
Equity income (loss)									19,000,000	15,000,000	9,000,000
Valuation Allowance against deferred tax assets											0
Flood Damage Charges Net of Insurance Recoveries									101,000,000
Goodwill, Impairment Loss											26,400,000,000
Pension Settlement Charge, pre-tax										56,000,000	2,700,000,000
Insurance Recoveries											9,000,000
Group [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member] | Product development agreement with Peugeot S.A. [Member]
Revenue and others for Reportable Segment [Abstract]
Charges related to PSA agreement										49,000,000
Group [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member] | Warranty Obligations [Member]
Revenue and others for Reportable Segment [Abstract]
Recall campaigns catch-up adjustment									874,000,000
Group [Member] | Automotive [Member] | Operating Segments [Member] | GME [Member]
Revenue and others for Reportable Segment [Abstract]
Net sales and revenue									22,235,000,000	21,962,000,000	23,055,000,000
GM Financial revenue									0	0	0
Total									22,235,000,000	21,962,000,000	23,055,000,000
Income (loss) before interest and taxes adjusted									-1,369,000,000	-869,000,000	-1,949,000,000
Adjustments									-245,000,000	153,000,000	-6,389,000,000
Equity in net assets of nonconsolidated affiliates	6,000,000				95,000,000				6,000,000	95,000,000	159,000,000	6,000,000	159,000,000
Total Assets	10,528,000,000				11,276,000,000				10,528,000,000	11,276,000,000	10,475,000,000	10,528,000,000	10,475,000,000
Expenditures for property									887,000,000	818,000,000	1,075,000,000
Depreciation, amortization and impairment of long-lived assets and finite-lived intangible assets									627,000,000	426,000,000	6,584,000,000
Equity income (loss)									-45,000,000	34,000,000	35,000,000
Valuation Allowance against deferred tax assets											0
Goodwill, Impairment Loss											590,000,000
Insurance Recoveries											9,000,000
Intangible Assets Impairment Charges											1,800,000,000
Group [Member] | Automotive [Member] | Operating Segments [Member] | GME [Member] | GM Strasbourg [Member]
Revenue and others for Reportable Segment [Abstract]
GMS Asset Impairment Charges											119,000,000
Group [Member] | Automotive [Member] | Operating Segments [Member] | GME [Member] | Property, Plant and Equipment [Member]
Revenue and others for Reportable Segment [Abstract]
Tangible Asset Impairment Charges											3,700,000,000
Group [Member] | Automotive [Member] | Operating Segments [Member] | GME [Member] | Equity investment in Peugeot S.A. [Member]
Revenue and others for Reportable Segment [Abstract]
Gain on Sale of Investments										152,000,000
Impairment Losses, PSA Investments											220,000,000
Group [Member] | Automotive [Member] | Operating Segments [Member] | GME [Member] | RUSSIAN
Revenue and others for Reportable Segment [Abstract]
Asset Impairment Charges									245,000,000
Group [Member] | Automotive [Member] | Operating Segments [Member] | GMIO [Member]
Revenue and others for Reportable Segment [Abstract]
Net sales and revenue									14,392,000,000	18,411,000,000	20,588,000,000
GM Financial revenue									0	0	0
Total									14,392,000,000	18,411,000,000	20,588,000,000
Income (loss) before interest and taxes adjusted									1,222,000,000	1,255,000,000	2,538,000,000
Adjustments									-180,000,000	-1,169,000,000	-290,000,000
Equity in net assets of nonconsolidated affiliates	8,254,000,000				7,921,000,000				8,254,000,000	7,921,000,000	6,656,000,000	8,254,000,000	6,656,000,000
Total Assets	22,949,000,000				22,100,000,000				22,949,000,000	22,100,000,000	24,147,000,000	22,949,000,000	24,147,000,000
Expenditures for property									681,000,000	724,000,000	1,185,000,000
Depreciation, amortization and impairment of long-lived assets and finite-lived intangible assets									740,000,000	1,786,000,000	624,000,000
Equity income (loss)									2,120,000,000	1,760,000,000	1,517,000,000
Valuation Allowance against deferred tax assets											0
Asset Impairment Charges										774,000,000
Goodwill Impairment Charges, Net of Noncontrolling Interest										442,000,000	132,000,000
Insurance Recoveries											110,000,000
Group [Member] | Automotive [Member] | Operating Segments [Member] | GMIO [Member] | GM Korea [Member]
Revenue and others for Reportable Segment [Abstract]
Loss (gain) related to preferred shares redemption										-67,000,000	-68,000,000
Group [Member] | Automotive [Member] | Operating Segments [Member] | GMIO [Member] | Withdrawal of the Chevrolet Brand from Europe [Member]
Revenue and others for Reportable Segment [Abstract]
Cost Related to Chevrolet Withdrawal										621,000,000
Group [Member] | Automotive [Member] | Operating Segments [Member] | GMIO [Member] | Korea Wage Litigation [Member]
Revenue and others for Reportable Segment [Abstract]
Loss Contingency Accrual Provision											336,000,000
GM Korea Wage Litigation Accrual Adjustment										577,000,000
Group [Member] | Automotive [Member] | Operating Segments [Member] | GMIO [Member] | Thailand [Member]
Revenue and others for Reportable Segment [Abstract]
Tangible Asset Impairment Charges									158,000,000
Group [Member] | Automotive [Member] | Operating Segments [Member] | GMSA [Member]
Revenue and others for Reportable Segment [Abstract]
Net sales and revenue									13,115,000,000	16,478,000,000	16,700,000,000
GM Financial revenue									0	0	0
Total									13,115,000,000	16,478,000,000	16,700,000,000
Income (loss) before interest and taxes adjusted									-180,000,000	327,000,000	457,000,000
Adjustments									-539,000,000	-157,000,000	27,000,000
Equity in net assets of nonconsolidated affiliates	2,000,000				4,000,000				2,000,000	4,000,000	3,000,000	2,000,000	3,000,000
Total Assets	10,066,000,000				11,488,000,000				10,066,000,000	11,488,000,000	11,958,000,000	10,066,000,000	11,958,000,000
Expenditures for property									359,000,000	444,000,000	956,000,000
Depreciation, amortization and impairment of long-lived assets and finite-lived intangible assets									386,000,000	522,000,000	483,000,000
Equity income (loss)									0	1,000,000	1,000,000
Valuation Allowance against deferred tax assets											0
Goodwill, Impairment Loss									120,000,000
Insurance Recoveries											27,000,000
Group [Member] | Automotive [Member] | Operating Segments [Member] | GMSA [Member] | VENEZUELA
Revenue and others for Reportable Segment [Abstract]
Venezuela Currency Devaluation charges									419,000,000	162,000,000
Group [Member] | Automotive [Member] | Intersegment Revenue [Member]
Revenue and others for Reportable Segment [Abstract]
Total										8,000,000	-2,000,000
Group [Member] | Automotive [Member] | Intersegment Revenue [Member] | GMNA [Member]
Revenue and others for Reportable Segment [Abstract]
Total										8,000,000	-2,000,000
Group [Member] | Automotive [Member] | Intersegment Revenue [Member] | GME [Member]
Revenue and others for Reportable Segment [Abstract]
Total										0	0
Group [Member] | Automotive [Member] | Intersegment Revenue [Member] | GMIO [Member]
Revenue and others for Reportable Segment [Abstract]
Total										0	0
Group [Member] | Automotive [Member] | Intersegment Revenue [Member] | GMSA [Member]
Revenue and others for Reportable Segment [Abstract]
Total										0	0
Group [Member] | Automotive [Member] | Corporate, Non-Segment [Member]
Revenue and others for Reportable Segment [Abstract]
Net sales and revenue									151,000,000	150,000,000	40,000,000
GM Financial revenue									0	0	0
Total									151,000,000	150,000,000	40,000,000
Income (loss) before interest and taxes adjusted									-580,000,000	-494,000,000	-400,000,000
Adjustments									-400,000,000	483,000,000	-402,000,000
Equity in net assets of nonconsolidated affiliates	0				0				0	0	0	0	0
Total Assets	24,368,000,000				26,460,000,000				24,368,000,000	26,460,000,000	16,991,000,000	24,368,000,000	16,991,000,000
Expenditures for property									127,000,000	92,000,000	77,000,000
Depreciation, amortization and impairment of long-lived assets and finite-lived intangible assets									75,000,000	63,000,000	49,000,000
Equity income (loss)									0	0	0
Valuation Allowance against deferred tax assets											-36,261,000,000
Group [Member] | Automotive [Member] | Corporate, Non-Segment [Member] | Common Stock [Member]
Revenue and others for Reportable Segment [Abstract]
Premium Paid on Repurchase of Common Stock											402,000,000
Group [Member] | Automotive [Member] | Corporate, Non-Segment [Member] | Ally Financial [Member]
Revenue and others for Reportable Segment [Abstract]
Gain on Sale of Ally Financial Common Stock										483,000,000
Group [Member] | Automotive [Member] | Corporate, Non-Segment [Member] | Ignition Switch Recall Compensation Program [Member]
Revenue and others for Reportable Segment [Abstract]
Loss Contingency Accrual Provision									400,000,000
Group [Member] | GM Financial [Member] | Operating Segments [Member] | GM Financial Segment [Member]
Revenue and others for Reportable Segment [Abstract]
GM Financial revenue									4,854,000,000	3,344,000,000	1,961,000,000
Total									4,854,000,000	3,344,000,000	1,961,000,000
Income (loss) before interest and taxes adjusted									803,000,000	898,000,000	744,000,000
Adjustments									12,000,000	-15,000,000	0
Equity in net assets of nonconsolidated affiliates	0				0				0	0	0	0	0
Total Assets	47,861,000,000				38,084,000,000				47,861,000,000	38,084,000,000	16,368,000,000	47,861,000,000	16,368,000,000
Expenditures for property									52,000,000	16,000,000	13,000,000
Depreciation, amortization and impairment of long-lived assets and finite-lived intangible assets									918,000,000	498,000,000	225,000,000
Equity income (loss)									0	0	0
Valuation Allowance against deferred tax assets											-103,000,000
Group [Member] | GM Financial [Member] | Operating Segments [Member] | GM Financial Segment [Member] | Withdrawal of the Chevrolet Brand from Europe [Member]
Revenue and others for Reportable Segment [Abstract]
Cost Related to Chevrolet Withdrawal										15,000,000
Group [Member] | GM Financial [Member] | Intersegment Revenue [Member] | GM Financial Segment [Member]
Revenue and others for Reportable Segment [Abstract]
Total										0	0
InterGroup Elimination [Member]
Revenue and others for Reportable Segment [Abstract]
Net sales and revenue									0	0	0
GM Financial revenue									-17,000,000	-9,000,000	0
Total									-17,000,000	-17,000,000	2,000,000
Income (loss) before interest and taxes adjusted									-5,000,000	0	-1,000,000
Adjustments									0	0	0
Equity in net assets of nonconsolidated affiliates	0				0				0	0	0	0	0
Total Assets	-1,918,000,000				-1,790,000,000				-1,918,000,000	-1,790,000,000	-690,000,000	-1,918,000,000	-690,000,000
Expenditures for property									0	0	0
Depreciation, amortization and impairment of long-lived assets and finite-lived intangible assets									0	-10,000,000	-10,000,000
Equity income (loss)									0	0	0
Valuation Allowance against deferred tax assets											0
InterGroup Elimination [Member] | Intersegment Eliminations [Member]
Revenue and others for Reportable Segment [Abstract]
Total										($8,000,000)	$2,000,000

Segment_Reporting_Revenues_and

Segment Reporting Revenues and long-lived assets by geographic region (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales and revenue									$151,092	$152,092	$150,295
GM Financial revenue									4,837	3,335	1,961
Total net sales and revenue	39,617	39,255	39,649	37,408	40,485	38,983	39,075	36,884	155,929	155,427	152,256
Long-Lived Assets	38,400				31,648				38,400	31,648	27,647
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales and revenue									93,559	88,784	85,105
GM Financial revenue									2,549	2,233	1,832
Non-U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales and revenue									57,533	63,308	65,190
GM Financial revenue									2,288	1,102	129
Maximum percent of total net sales and revenues in an individual country									10.00%	10.00%	10.00%
Maximum percent of total long-lived assets in an individual country	10.00%				10.00%				10.00%	10.00%	10.00%
Automotive [Member] | UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	18,813				15,844				18,813	15,844	13,520
Automotive [Member] | Non-U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	12,355				12,289				12,355	12,289	12,425
GM Financial [Member] | UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	5,477				2,472				5,477	2,472	1,112
GM Financial [Member] | Non-U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	$1,755				$1,043				$1,755	$1,043	$590

Supplemental_Information_for_t2

Supplemental Information for the Consolidated Statements of Cash Flows (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts Receivable	($1,248)	$8	($460)
Purchases of Wholesale Receivables, net	-2,000	0	0
Inventories	-309	59	-326
Automotive Equipment on Operating Leases	-1,949	-968	370
Change in Other Assets	-213	-563	-312
Accounts Payable	19	-485	162
Income Taxes Payable	-145	-161	155
Accrued Liabilities and Other Liabilities	6,089	784	1,041
Total	244	-1,326	630
Cash Paid for Income Taxes and Interest
Cash Paid for Income Taxes	947	727	575
Cash Paid for Interest (net of amounts capitalized)	1,421	1,059	633
Automotive [Member]
Cash Paid for Income Taxes and Interest
Cash Paid for Interest (net of amounts capitalized)	301	299	335
GM Financial [Member]
Cash Paid for Income Taxes and Interest
Cash Paid for Interest (net of amounts capitalized)	$1,120	$760	$298