General Dynamics (GD) 10-K 12 Feb 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2017	Jan. 28, 2018	Jul. 02, 2017
Document and Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Trading Symbol	GD
Entity Registrant Name	GENERAL DYNAMICS CORPORATION
Entity Central Index Key	40,533
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		296,933,621
Entity Public Float			$ 52,357,779,347
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes

Consolidated Statements of Earn

Consolidated Statements of Earnings - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue:
Products	$ 19,016	$ 19,010	$ 20,477
Services	11,957	11,551	11,304
Revenue	30,973	30,561	31,781
Operating costs and expenses:
Products	14,799	15,159	15,986
Services	9,987	9,746	9,563
General and administrative (G&A)	2,010	1,922	1,937
Operating costs and expenses, Total	26,796	26,827	27,486
Operating earnings	4,177	3,734	4,295
Interest, net	(103)	(91)	(83)
Other, net	3	13	7
Earnings from continuing operations before income tax	4,077	3,656	4,219
Provision for income tax, net	1,165	977	1,183
Earnings from continuing operations	2,912	2,679	3,036
Discontinued operations, net of tax benefit of $51 in 2016 and $7 in 2015	0	(107)	0
Net earnings	$ 2,912	$ 2,572	$ 3,036
Basic:
Continuing operations	$ 9.73	$ 8.79	$ 9.45
Discontinued operations	0	(0.35)	0
Net earnings	9.73	8.44	9.45
Diluted:
Continuing operations	9.56	8.64	9.29
Discontinued operations	0	(0.35)	0
Net earnings	$ 9.56	$ 8.29	$ 9.29

Consolidated Statements of Ear3

Consolidated Statements of Earnings (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Consolidated Statements of Earnings (Loss) (Parenthetical) [Abstract]
Tax benefit	$ 0	$ 51	$ 7

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net earnings	$ 2,912	$ 2,572	$ 3,036
Gains (losses) on cash flow hedges	341	191	(394)
Unrealized gains (losses) on securities	9	(9)	(2)
Foreign currency translation adjustments	348	(112)	(371)
Change in retirement plans’ funded status	20	(192)	500
Other comprehensive income (loss), pretax	718	(122)	(267)
Provision (benefit) for income tax, net	151	(18)	84
Other comprehensive income (loss), net of tax	567	(104)	(351)
Comprehensive income	$ 3,479	$ 2,468	$ 2,685

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and equivalents		$ 2,983	$ 2,334	$ 2,785	$ 4,388
Accounts receivable		3,617	3,399
Unbilled receivables		5,240	4,212
Inventories		5,303	5,118
Other current assets		1,185	1,471
Total current assets		18,328	16,534
Noncurrent assets:
Property, plant and equipment, net		3,517	3,477
Intangible assets, net		702	678
Goodwill	[1]	11,914	11,445	11,443
Other assets		585	1,038
Total noncurrent assets		16,718	16,638
Total assets		35,046	33,172	32,538
Current liabilities:
Short-term debt and current portion of long-term debt		2	900
Accounts payable		3,207	2,538
Customer advances and deposits		6,992	6,827
Other current liabilities		2,898	3,185
Total current liabilities		13,099	13,450
Noncurrent liabilities:
Long-term debt		3,980	2,988
Other liabilities		6,532	6,433
Commitments and contingencies (see Note O)
Total noncurrent liabilities		10,512	9,421
Shareholders’ equity:
Common stock		482	482
Surplus		2,872	2,819
Retained earnings		26,444	24,543
Treasury stock		(15,543)	(14,156)
Accumulated other comprehensive loss		(2,820)	(3,387)	(3,283)	(2,932)
Total shareholders’ equity		11,435	10,301	$ 10,440	$ 11,829
Total liabilities and shareholders’ equity		$ 35,046	$ 33,172
[1]	Goodwill in the Information Systems and Technology reporting unit is net of $2 billion of accumulated impairment losses.

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities - continuing operations:
Net earnings	$ 2,912	$ 2,572	$ 3,036
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation of property, plant and equipment	362	365	365
Amortization of intangible assets	79	88	116
Equity-based compensation expense	123	95	98
Deferred income tax provision	401	184	213
Discontinued operations, net of tax	0	107	0
(Increase) decrease in assets, net of effects of business acquisitions:
Accounts receivable	(195)	(122)	632
Unbilled receivables	(987)	(1,048)	61
Inventories	(182)	(377)	141
Other current assets	207	315	80
Increase (decrease) in liabilities, net of effects of business acquisitions:
Accounts payable	657	567	(89)
Customer advances and deposits	264	(305)	(2,153)
Other, net	238	(243)	107
Net cash provided by operating activities	3,879	2,198	2,607
Cash flows from investing activities:
Capital expenditures	(428)	(392)	(569)
Business acquisitions, net of cash acquired	(399)	(58)	(5)
Maturities of held-to-maturity securities	0	0	500
Proceeds from sales of assets	50	9	291
Other, net	(14)	15	(17)
Net cash (used) provided by investing activities	(791)	(426)	200
Cash flows from financing activities:
Purchases of common stock	(1,558)	(1,996)	(3,233)
Dividends paid	(986)	(911)	(873)
Proceeds from fixed-rate notes	985	992	0
Repayment of fixed-rate notes	(900)	(500)	(500)
Proceeds from stock option exercises	163	292	268
Other, net	(103)	(46)	(29)
Net cash used by financing activities	(2,399)	(2,169)	(4,367)
Net cash used by discontinued operations	(40)	(54)	(43)
Net increase (decrease) in cash and equivalents	649	(451)	(1,603)
Cash and equivalents at beginning of year	2,334	2,785	4,388
Cash and equivalents at end of year	$ 2,983	$ 2,334	$ 2,785

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock	Common Stock Surplus	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss
Cumulative-effect adjustment (See Note T)	$ (372)			$ (372)
Beginning Balance at Dec. 31, 2014	11,829	$ 482	$ 2,548	21,127	$ (9,396)	$ (2,932)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	3,036			3,036
Cash dividends declared	(888)			(888)
Equity-based awards	419		182		237
Shares purchased	(3,233)				(3,233)
Other comprehensive income (loss)	(351)					(351)
Ending Balance at Dec. 31, 2015	10,440	482	2,730	22,903	(12,392)	(3,283)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	2,572			2,572
Cash dividends declared	(932)			(932)
Equity-based awards	356		89		267
Shares purchased	(2,031)				(2,031)
Other comprehensive income (loss)	(104)					(104)
Ending Balance at Dec. 31, 2016	10,301	482	2,819	24,543	(14,156)	(3,387)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	2,912			2,912
Cash dividends declared	(1,008)			(1,008)
Equity-based awards	199		53		146
Shares purchased	(1,533)				(1,533)
Other comprehensive income (loss)	567					567
Ending Balance at Dec. 31, 2017	11,435	$ 482	$ 2,872	26,444	$ (15,543)	$ (2,820)
Cumulative-effect adjustment (See Note A)	$ (3)			$ (3)

Summary Of Significant Accounti

Summary Of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Summary Of Significant Accounting Policies	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Organization. General Dynamics is organized into four business groups: Aerospace, which delivers Gulfstream aircraft and provides services for Gulfstream aircraft and aircraft produced by other original equipment manufacturers (OEMs); Combat Systems, which designs and manufactures combat vehicles, weapons systems and munitions; Information Systems and Technology, which provides C4ISR (command, control, communication, computers, intelligence, surveillance and reconnaissance) solutions and information technology (IT) services; and Marine Systems, which designs, constructs and repairs surface ships and submarines. Our primary customer is the U.S. government. We also do significant business with non-U.S. governments and a diverse base of corporate and individual buyers of business aircraft. Basis of Consolidation and Classification. The Consolidated Financial Statements include the accounts of General Dynamics Corporation and our wholly owned and majority-owned subsidiaries. We eliminate all inter-company balances and transactions in the Consolidated Financial Statements. Some prior-year amounts have been reclassified among financial statement accounts or disclosures to conform to the current-year presentation. Consistent with industry practice, we classify assets and liabilities related to long-term contracts as current, even though some of these amounts may not be realized within one year. Further discussion of our significant accounting policies is contained in the other notes to these financial statements. Use of Estimates. The nature of our business requires that we make estimates and assumptions in accordance with U.S. generally accepted accounting principles (GAAP). These estimates and assumptions affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements, as well as the reported amounts of revenue and expenses during the reporting period . We base our estimates on historical experience, currently available information and various other assumptions that we believe are reasonable under the circumstances . Actual results could differ from these estimates. Discontinued Operations, Net of Tax. In 2013, we settled litigation with the U.S. Navy related to the terminated A-12 aircraft contract in the company’s former tactical military aircraft business. In connection with the settlement, we released some rights to reimbursement of costs on ships under contract at our Bath, Maine, shipyard. As we progressed through the shipbuilding process, we determined that the cost associated with this settlement was greater than anticipated. Therefore, in 2016, we recognized an $84 loss, net of tax, to adjust the previously-recognized settlement value. In addition, we recognized a $10 loss, net of tax, in 2016 related to an environmental matter associated with a former operation of the company. In 2015, we completed the sale of our axle business in the Combat Systems group. In 2016, we recognized a final adjustment of $13 to the loss on the sale of this business. Research and Development Expenses. Company-sponsored research and development (R&D) expenses, including product development costs, were $521 in 2017 , $418 in 2016 and $395 in 2015 . The increase in 2017 is due primarily to higher R&D expenses in the Aerospace group associated with ongoing product-development efforts as the group progresses with the certification of its two newest aircraft models, the G500 and G600. R&D expenses are included in operating costs and expenses in the Consolidated Statement of Earnings in the period in which they are incurred. Customer-sponsored R&D expenses are charged directly to the related contracts. The Aerospace group has cost-sharing arrangements with some of its suppliers that enhance the group’s internal development capabilities and offset a portion of the financial cost associated with the group’s product development efforts. These arrangements explicitly state that supplier contributions are for reimbursements of costs we incur in the development of new aircraft models and technologies, and we retain substantial rights in the products developed under these arrangements. We record amounts received from these cost-sharing arrangements as a reduction of R&D expenses. We have no obligation to refund any amounts received under the agreements regardless of the outcome of the development efforts. Under the typical terms of an agreement, payments received from suppliers for their share of the costs are based on milestones and are recognized as received. Our policy is to defer payments in excess of the costs we have incurred. Interest, Net. Net interest expense consisted of the following: Year Ended December 31 2017 2016 2015 Interest expense $ 117 $ 99 $ 98 Interest income (14 ) (8 ) (15 ) Interest expense, net $ 103 $ 91 $ 83 Cash and Equivalents and Investments in Debt and Equity Securities. We consider securities with a maturity of three months or less to be cash equivalents. Our cash balances are invested primarily in time deposits rated A-/A3 or higher. Our investments in other securities are included in other current and noncurrent assets on the Consolidated Balance Sheet (see Note E). We report our held-to-maturity securities at amortized cost. We report our available-for-sale securities at fair value. Changes in the fair value of available-for-sale securities are recognized as a component of other comprehensive income (loss) in the Consolidated Statement of Comprehensive Income. We had no trading securities on December 31, 2017 or 2016 . Cash flows in 2016 and 2015 were affected negatively by growth in operating working capital in our Combat Systems group due to the utilization of deposits and the timing of billings on a large contract for a Middle Eastern customer, and in our Aerospace group from the build-up of inventory related to the new G500 and G600 aircraft programs and the liquidation of customer deposits associated with aircraft deliveries. In 2017, the growth in operating working capital due to these factors slowed and was offset by lower income tax payments. Other Contract Costs. Other contract costs represent amounts that are not currently allocable to government contracts, such as a portion of our estimated workers’ compensation obligations, other insurance-related assessments, pension and other post-retirement benefits, and environmental expenses. These costs will become allocable to contracts generally after they are paid. We expect to recover these costs through ongoing business, including existing backlog and probable follow-on contracts. If the backlog in the future does not support the continued deferral of these costs, the profitability of our remaining contracts could be adversely affected. Other contract costs on December 31, 2017 and 2016 , were $448 and $699 , respectively, and are included in other current assets on the Consolidated Balance Sheet . Long-lived Assets and Goodwill. We review long-lived assets, including intangible assets subject to amortization, for impairment whenever events or changes in circumstances indicate that the carrying value of the asset may not be recoverable. We assess the recoverability of the carrying value of assets held for use based on a review of undiscounted projected cash flows. Impairment losses, where identified, are measured as the excess of the carrying value of the long-lived asset over its estimated fair value as determined by discounted projected cash flows. We review goodwill for impairment annually or when circumstances indicate that an impairment is more likely than not. Goodwill represents the purchase price paid in excess of the fair value of net tangible and intangible assets acquired. The test for goodwill impairment is a two-step process to first identify potential goodwill impairment for each reporting unit and then, if necessary, measure the amount of the impairment loss. Our reporting units are consistent with our business groups in Note R. We completed the required annual goodwill impairment test as of December 31, 2017 . The first step of the goodwill impairment test compares the fair value of each of our reporting units to its carrying value. We estimate the fair value of our reporting units based primarily on the discounted projected cash flows of the underlying operations. The estimated fair value of each of our reporting units was well in excess of its respective carrying value as of December 31, 2017 . For a summary of our goodwill by reporting unit, see Note C. Accounting Standards Updates. On January 1, 2017, we retrospectively adopted the following accounting standards issued by the Financial Accounting Standards Board (FASB) that impacted our prior-period financial statements: • ASC Topic 606, Revenue from Contracts with Customers • ASU 2015-17, Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes See Note T for further discussion of each of these accounting standards. We also adopted ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory, on January 1, 2017. We recognized the cumulative effect of this standard as a $3 decrease to retained earnings on the date of adoption. ASU 2016-16 requires recognition of the current and deferred income tax effects of an intra-entity asset transfer, other than inventory, when the transfer occurs, as opposed to former GAAP, which required companies to defer the income tax effects of intra-entity asset transfers until the asset was sold to an outside party. The income tax effects of intra-entity inventory transfers will continue to be deferred until the inventory is sold. There are several new accounting standards that have been issued by the FASB but are not effective until after December 31, 2017, including the following: • ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. ASU 2016-01 addresses certain aspects of recognition, measurement, presentation and disclosure of financial instruments. Specific to our business, ASU 2016-01 requires equity investments to be measured at fair value with changes in fair value recognized in net income. The ASU eliminates the available-for-sale classification for equity investments that recognized changes in fair value as a component of other comprehensive income. We adopted the standard on a modified retrospective basis with a cumulative-effect adjustment to the Consolidated Balance Sheet on January 1, 2018. The adoption of the ASU did not have a material effect on our results of operations, financial condition or cash flows. • ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. ASU 2016-15 is intended to reduce diversity in practice in how certain cash receipts and cash payments are presented and classified in the Consolidated Statement of Cash Flows by providing guidance on eight specific cash flow issues. We adopted the standard retrospectively on January 1, 2018. The adoption of the ASU did not have a material effect on our cash flows. • ASU 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. ASU 2017-07 requires the service cost component of net benefit cost to be reported separately from the other components of net benefit cost in the income statement. The ASU also allows only the service cost component of net benefit cost to be eligible for capitalization. We adopted the standard retrospectively on January 1, 2018. Our reported 2017 operating earnings, when restated, will increase $59 due to the reclassification of the non-service cost components of net benefit cost, and our reported other income will decrease by the same amount, with no impact to net earnings. The area of the ASU related to capitalization did not have a material effect on our results of operations, financial condition or cash flows. • ASU 2016-02, Leases (Topic 842). ASU 2016-02 requires the recognition of lease rights and obligations as assets and liabilities on the balance sheet. Previously, lessees were not required to recognize on the balance sheet assets and liabilities arising from operating leases. The ASU also requires disclosure of key information about leasing arrangements. ASU 2016-02 is effective on January 1, 2019, using a modified retrospective method of adoption as of January 1, 2017. In January 2018, the FASB issued an exposure draft of the proposed ASU, Leases (Topic 842): Targeted Improvements. The proposed ASU provides an alternative transition method of adoption, permitting the recognition of a cumulative-effect adjustment to retained earnings on the date of adoption. We intend to adopt the standard on the effective date, but have not yet selected a transition method. We are currently evaluating our population of leased assets in order to assess the impact of the ASU on our lease portfolio, and designing and implementing new processes and controls. Until this effort is completed, we cannot determine the effect of the ASU on our results of operations, financial condition or cash flows. • ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. ASU 2017-12 is intended to simplify hedge accounting by better aligning an entity’s financial reporting for hedging relationships with its risk management activities. The ASU also simplifies the application of the hedge accounting guidance. ASU 2017-12 is effective on January 1, 2019, with early adoption permitted. For cash flow hedges existing at the adoption date, the standard requires adoption on a modified retrospective basis with a cumulative-effect adjustment to the Consolidated Balance Sheet as of the beginning of the year of adoption. The amendments to presentation guidance and disclosure requirements are required to be adopted prospectively. We have not yet determined the effect of the ASU on our results of operations, financial condition or cash flows, nor have we selected a transition date. Subsequent Event. On February 12, 2018 , we announced that we had entered into a definitive agreement to acquire all of the outstanding shares of CSRA for $40.75 per share in cash. The transaction is valued at $9.6 billion , including the assumption of $2.8 billion in CSRA debt. We anticipate financing the transaction through a combination of available cash and new debt financing. We will commence a cash tender offer to purchase all of the outstanding shares of CSRA common stock. The tender offer is subject to customary conditions, including antitrust clearance and the tender of a majority of the outstanding shares of CSRA common stock. We expect to complete the acquisition in the first half of 2018.

Revenue

Revenue	12 Months Ended
	Dec. 31, 2017
Revenue Recognition [Abstract]
Revenue	REVENUE The majority of our revenue is derived from long-term contracts and programs that can span several years. We account for revenue in accordance with ASC Topic 606. Performance Obligations. A performance obligation is a promise in a contract to transfer a distinct good or service to the customer, and is the unit of account in ASC Topic 606. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. The majority of our contracts have a single performance obligation as the promise to transfer the individual goods or services is not separately identifiable from other promises in the contracts and is, therefore, not distinct. Some of our contracts have multiple performance obligations, most commonly due to the contract covering multiple phases of the product lifecycle (development, production, maintenance and support). For contracts with multiple performance obligations, we allocate the contract’s transaction price to each performance obligation using our best estimate of the standalone selling price of each distinct good or service in the contract. The primary method used to estimate standalone selling price is the expected cost plus a margin approach, under which we forecast our expected costs of satisfying a performance obligation and then add an appropriate margin for that distinct good or service. Contract modifications are routine in the performance of our contracts. Contracts are often modified to account for changes in contract specifications or requirements. In most instances, contract modifications are for goods or services that are not distinct, and, therefore, are accounted for as part of the existing contract. Our performance obligations are satisfied over time as work progresses or at a point in time. Revenue from products and services transferred to customers over time accounted for 71% of our revenue in 2017 , 72% in 2016 and 68% in 2015 . Substantially all of our revenue in the defense groups is recognized over time, because control is transferred continuously to our customers. Typically, revenue is recognized over time using costs incurred to date relative to total estimated costs at completion to measure progress toward satisfying our performance obligations. Incurred cost represents work performed, which corresponds with, and thereby best depicts, the transfer of control to the customer. Contract costs include labor, material, overhead and, when appropriate, G&A expenses. Revenue from goods and services transferred to customers at a point in time accounted for 29% of our revenue in 2017 , 28% in 2016 and 32% in 2015 . The majority of our revenue recognized at a point in time is for the manufacture of business-jet aircraft in our Aerospace group. Revenue on these contracts is recognized when the customer obtains control of the asset, which is generally upon delivery and acceptance by the customer of the fully outfitted aircraft . On December 31, 2017, we had $63.2 billion of remaining performance obligations, which we also refer to as total backlog. We expect to recognize approximately 40% of our remaining performance obligations as revenue in 2018, an additional 40% by 2020 and the balance thereafter. Contract Estimates. Accounting for long-term contracts and programs involves the use of various techniques to estimate total contract revenue and costs. For long-term contracts, we estimate the profit on a contract as the difference between the total estimated revenue and expected costs to complete a contract and recognize that profit over the life of the contract. Contract estimates are based on various assumptions to project the outcome of future events that often span several years. These assumptions include labor productivity and availability; the complexity of the work to be performed; the cost and availability of materials; the performance of subcontractors; and the availability and timing of funding from the customer. The nature of our contracts gives rise to several types of variable consideration, including claims and award and incentive fees. We include in our contract estimates additional revenue for submitted contract modifications or claims against the customer when we believe we have an enforceable right to the modification or claim, the amount can be estimated reliably and its realization is probable. In evaluating these criteria, we consider the contractual/legal basis for the claim, the cause of any additional costs incurred, the reasonableness of those costs and the objective evidence available to support the claim. We include award or incentive fees in the estimated transaction price when there is a basis to reasonably estimate the amount of the fee. These estimates are based on historical award experience, anticipated performance and our best judgment at the time. Because of our certainty in estimating these amounts, they are included in the transaction price of our contracts and the associated remaining performance obligations. As a significant change in one or more of these estimates could affect the profitability of our contracts, we review and update our contract-related estimates regularly. We recognize adjustments in estimated profit on contracts under the cumulative catch-up method. Under this method, the impact of the adjustment on profit recorded to date on a contract is recognized in the period the adjustment is identified. Revenue and profit in future periods of contract performance are recognized using the adjusted estimate. If at any time the estimate of contract profitability indicates an anticipated loss on the contract, we recognize the total loss in the period it is identified. The impact of adjustments in contract estimates on our operating earnings can be reflected in either operating costs and expenses or revenue. The aggregate impact of adjustments in contract estimates increased our revenue, operating earnings and diluted earnings per share as follows: Year Ended December 31 2017 2016 2015 Revenue $ 292 $ 95 $ 356 Operating earnings 323 16 271 Diluted earnings per share $ 0.69 $ 0.03 $ 0.54 While no adjustment on any one contract was material to our Consolidated Financial Statements in 2017 , 2016 or 2015 , the amount in 2016 was negatively impacted by a loss on the design and development phase of the AJAX program in our Combat Systems group and cost growth associated with the restart of the Navy’s DDG-51 program in our Marine Systems group. Revenue by Category. Our portfolio of products and services consists of almost 10,000 active contracts. The following series of tables presents our revenue disaggregated by several categories. Revenue by major products and services was as follows: Year Ended December 31 2017 2016 2015 Aircraft manufacturing, outfitting and completions $ 6,320 $ 6,074 $ 7,497 Aircraft services 1,743 1,625 1,569 Pre-owned aircraft 66 116 111 Total Aerospace 8,129 7,815 9,177 Wheeled combat and tactical vehicles 2,506 2,444 2,597 Weapons systems, armament and munitions 1,633 1,517 1,508 Tanks and tracked vehicles 1,225 934 805 Engineering and other services 585 635 733 Total Combat Systems 5,949 5,530 5,643 C4ISR solutions 4,481 4,716 4,419 IT services 4,410 4,428 4,510 Total Information Systems and Technology 8,891 9,144 8,929 Nuclear-powered submarines 5,175 5,264 5,010 Surface combatants 1,043 994 1,081 Auxiliary and commercial ships 564 654 672 Repair and other services 1,222 1,160 1,269 Total Marine Systems 8,004 8,072 8,032 Total revenue $ 30,973 $ 30,561 $ 31,781 Revenue by contract type was as follows: Year Ended December 31, 2017 Aerospace Combat Systems Information Systems and Technology Marine Systems Total Fixed-price $ 7,479 $ 5,090 $ 3,943 $ 4,808 $ 21,320 Cost-reimbursement — 823 4,143 3,186 8,152 Time-and-materials 650 36 805 10 1,501 Total revenue $ 8,129 $ 5,949 $ 8,891 $ 8,004 $ 30,973 Year Ended December 31, 2016 Fixed-price $ 7,208 $ 4,629 $ 4,251 $ 4,857 $ 20,945 Cost-reimbursement — 865 4,084 3,204 8,153 Time-and-materials 607 36 809 11 1,463 Total revenue $ 7,815 $ 5,530 $ 9,144 $ 8,072 $ 30,561 Year Ended December 31, 2015 Fixed-price $ 8,583 $ 4,776 $ 4,066 $ 5,334 $ 22,759 Cost-reimbursement — 838 4,029 2,685 7,552 Time-and-materials 594 29 834 13 1,470 Total revenue $ 9,177 $ 5,643 $ 8,929 $ 8,032 $ 31,781 Each of these contract types presents advantages and disadvantages. Typically, we assume more risk with fixed-price contracts. However, these types of contracts offer additional profits when we complete the work for less than originally estimated. Cost-reimbursement contracts generally subject us to lower risk. Accordingly, the associated base fees are usually lower than fees earned on fixed-price contracts. Under time-and-materials contracts, our profit may vary if actual labor-hour rates vary significantly from the negotiated rates. Also, because these contracts can provide little or no fee for managing material costs, the content mix can impact profitability. Revenue by customer was as follows: Year Ended December 31, 2017 Aerospace Combat Systems Information Systems and Technology Marine Systems Total U.S. government: Department of Defense (DoD) $ 189 $ 2,618 $ 4,970 $ 7,721 $ 15,498 Non-DoD — 92 2,755 — 2,847 Foreign Military Sales (FMS) 42 374 68 192 676 Total U.S. government 231 3,084 7,793 7,913 19,021 U.S. commercial 3,885 220 322 71 4,498 Non-U.S. government 210 2,580 610 13 3,413 Non-U.S. commercial 3,803 65 166 7 4,041 Total revenue $ 8,129 $ 5,949 $ 8,891 $ 8,004 $ 30,973 Year Ended December 31, 2016 U.S. government: DoD $ 231 $ 2,200 $ 5,201 $ 7,507 $ 15,139 Non-DoD — 81 2,735 8 2,824 FMS 130 333 48 202 713 Total U.S. government 361 2,614 7,984 7,717 18,676 U.S. commercial 3,501 287 367 329 4,484 Non-U.S. government 496 2,520 621 26 3,663 Non-U.S. commercial 3,457 109 172 — 3,738 Total revenue $ 7,815 $ 5,530 $ 9,144 $ 8,072 $ 30,561 Year Ended December 31, 2015 U.S. government: DoD $ 98 $ 2,225 $ 5,047 $ 7,324 $ 14,694 Non-DoD — 83 2,736 12 2,831 FMS 6 282 38 127 453 Total U.S. government 104 2,590 7,821 7,463 17,978 U.S. commercial 4,334 242 385 541 5,502 Non-U.S. government 560 2,714 558 28 3,860 Non-U.S. commercial 4,179 97 165 — 4,441 Total revenue $ 9,177 $ 5,643 $ 8,929 $ 8,032 $ 31,781 Contract Balances. The timing of revenue recognition, billings and cash collections results in billed accounts receivable, unbilled receivables (contract assets), and customer advances and deposits (contract liabilities) on the Consolidated Balance Sheet. In our defense groups, amounts are billed as work progresses in accordance with agreed-upon contractual terms, either at periodic intervals (e.g., biweekly or monthly) or upon achievement of contractual milestones. Generally, billing occurs subsequent to revenue recognition, resulting in contract assets. However, we sometimes receive advances or deposits from our customers, particularly on our international contracts, before revenue is recognized, resulting in contract liabilities. These assets and liabilities are reported on the Consolidated Balance Sheet on a contract-by-contract basis at the end of each reporting period. In our Aerospace group, we generally receive deposits from customers upon contract execution and upon achievement of contractual milestones. These deposits are liquidated when revenue is recognized. Changes in the contract asset and liability balances during the year ended December 31, 2017, were not materially impacted by any other factors. Revenue recognized in 2017 , 2016 and 2015 that was included in the contract liability balance at the beginning of each year was $4.3 billion , $4.2 billion and $6 billion , respectively. This revenue represented primarily the sale of business-jet aircraft.

Acquisitions, Goodwill and Inta

Acquisitions, Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Acquisitions, Goodwill and Intangible Assets	ACQUISITIONS, GOODWILL AND INTANGIBLE ASSETS Acquisitions. In 2017 , we acquired four businesses for an aggregate of $399 : a fixed-base operation (FBO) in our Aerospace group; and a manufacturer of electronics and communications products, a provider of mission-critical support services and technology solutions, and a manufacturer of signal distribution products in our Information Systems and Technology group. In 2016 , we acquired an aircraft management and charter services provider in our Aerospace group and a manufacturer of unmanned underwater vehicles in our Information Systems and Technology group for an aggregate of $58 . We did not acquire any businesses in 2015. The operating results of these acquisitions have been included with our reported results since the respective closing dates. The purchase prices of the acquisitions have been allocated to the estimated fair value of net tangible and intangible assets acquired, with any excess purchase price recorded as goodwill. Goodwill. The changes in the carrying amount of goodwill by reporting unit were as follows: Aerospace Combat Systems Information Systems and Technology Marine Systems Total Goodwill December 31, 2015 (a) $ 2,542 $ 2,591 $ 6,021 $ 289 $ 11,443 Acquisitions (b) 29 — 2 — 31 Other (c) (34 ) 7 (10 ) 8 (29 ) December 31, 2016 (a) 2,537 2,598 6,013 297 11,445 Acquisitions (b) 28 — 269 — 297 Other (c) 73 79 20 — 172 December 31, 2017 (a) $ 2,638 $ 2,677 $ 6,302 $ 297 $ 11,914 (a) Goodwill in the Information Systems and Technology reporting unit is net of $2 billion of accumulated impairment losses. (b) Includes adjustments during the purchase price allocation period. (c) Consists primarily of adjustments for foreign currency translation. Intangible Assets. Intangible assets consisted of the following: Gross Carrying Amount (a) Accumulated Amortization Net Carrying Amount Gross Carrying Amount (a) Accumulated Amortization Net Carrying Amount December 31 2017 2016 Contract and program intangible assets (b) $ 1,684 $ (1,320 ) $ 364 $ 1,633 $ (1,281 ) $ 352 Trade names and trademarks 465 (160 ) 305 446 (139 ) 307 Technology and software 137 (105 ) 32 121 (102 ) 19 Other intangible assets 155 (154 ) 1 154 (154 ) — Total intangible assets $ 2,441 $ (1,739 ) $ 702 $ 2,354 $ (1,676 ) $ 678 (a) Change in gross carrying amounts consists primarily of adjustments for acquired intangible assets and foreign currency translation. (b) Consists of acquired backlog and probable follow-on work and associated customer relationships. We did not recognize any impairments of our intangible assets in 2017 , 2016 or 2015 . The amortization lives (in years) of our intangible assets on December 31, 2017 , were as follows: Range of Amortization Life Contract and program intangible assets 7-30 Trade names and trademarks 30 Technology and software 5-15 Other intangible assets 7 Amortization expense was $79 in 2017 , $88 in 2016 and $116 in 2015 . We expect to record annual amortization expense over the next five years as follows: 2018 $ 80 2019 67 2020 62 2021 57 2022 50

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Earnings Per Share	EARNINGS PER SHARE We compute basic earnings per share (EPS) using net earnings for the period and the weighted average number of common shares outstanding during the period. Basic weighted average shares outstanding have decreased in 2017 and 2016 due to share repurchases. See Note M for further discussion of our share repurchases. Diluted EPS incorporates the additional shares issuable upon the assumed exercise of stock options and the release of restricted stock and restricted stock units (RSUs). Basic and diluted weighted average shares outstanding were as follows (in thousands): Year Ended December 31 2017 2016 2015 Basic weighted average shares outstanding 299,172 304,707 321,313 Dilutive effect of stock options and restricted stock/RSUs* 5,465 5,680 5,339 Diluted weighted average shares outstanding 304,637 310,387 326,652 * Excludes outstanding options to purchase shares of common stock that had exercise prices in excess of the average market price of our common stock during the year and, therefore, the effect of including these options would be antidilutive. These options totaled 1,547 in 2017 , 4,201 in 2016 and 1,706 in 2015 .

Fair Value

Fair Value	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value	FAIR VALUE Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in the principal or most advantageous market in an orderly transaction between marketplace participants. Various valuation approaches can be used to determine fair value, each requiring different valuation inputs. The following hierarchy classifies the inputs used to determine fair value into three levels: • Level 1 - quoted prices in active markets for identical assets or liabilities; • Level 2 - inputs, other than quoted prices, observable by a marketplace participant either directly or indirectly; and • Level 3 - unobservable inputs significant to the fair value measurement. We did not have any significant non-financial assets or liabilities measured at fair value on December 31, 2017 or 2016 . Our financial instruments include cash and equivalents and other investments, accounts receivable and payable, short- and long-term debt, and derivative financial instruments. The carrying values of cash and equivalents, accounts receivable and payable, and short-term debt on the Consolidated Balance Sheet approximate their fair value. The following tables present the fair values of our other financial assets and liabilities on December 31, 2017 and 2016 , and the basis for determining their fair values: Carrying Value Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) (b) Financial Assets (Liabilities) (a) December 31, 2017 Marketable securities held in trust $ 191 $ 191 $ 69 $ 122 Cash flow hedges (105 ) (105 ) — (105 ) Short- and long-term debt principal (4,032 ) (3,974 ) — (3,974 ) December 31, 2016 Marketable securities held in trust $ 177 $ 177 $ 59 $ 118 Cash flow hedges (477 ) (477 ) — (477 ) Short- and long-term debt principal (3,924 ) (3,849 ) — (3,849 ) (a) We had no Level 3 financial instruments on December 31, 2017 or 2016 . (b) Determined under a market approach using valuation models that incorporate observable inputs such as interest rates, bond yields and quoted prices for similar assets and liabilities.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES Income Tax Provision. We calculate our provision for federal, state and international income taxes based on current tax law. The Tax Cuts and Jobs Act (tax reform) was enacted on December 22, 2017, and has several key provisions impacting accounting for and reporting of income taxes. The most significant provision reduces the U.S. corporate statutory tax rate from 35% to 21% beginning on January 1, 2018. Although most provisions of tax reform are not effective until 2018, we are required to record the effect of a change in tax law in the period of enactment (2017). The provision for income taxes and effective tax rate in 2017 included a $119 unfavorable impact from the change in tax law. The impact is due primarily to the remeasurement of our U.S. federal deferred tax assets and liabilities at the tax rate expected to apply when the temporary differences are realized/settled (remeasured at a rate of 21% versus 35% for the majority of our deferred tax assets and liabilities). The other key provision that requires recognition in the period of enactment is the one-time toll charge resulting from the mandatory deemed repatriation of undistributed foreign taxable income. As it relates to our operations, there was no impact in 2017 from the mandatory deemed repatriation as we had no net undistributed foreign taxable income subject to the toll charge. We have obtained and analyzed all necessary information to record the effect of the change in tax law, and do not anticipate reporting additional tax effects in the future. However, should the Internal Revenue Service (IRS) issue further guidance or interpretation of relevant aspects of the new tax law, we may adjust these amounts. The following is a summary of our net provision for income taxes for continuing operations: Year Ended December 31 2017 2016 2015 Current: U.S. federal $ 656 $ 698 $ 841 State 31 24 31 International 77 71 98 Total current 764 793 970 Deferred: U.S. federal 215 140 163 State 7 7 7 International 60 37 43 Adjustment for enacted change in U.S. tax law 119 — — Total deferred 401 184 213 Provision for income taxes, net $ 1,165 $ 977 $ 1,183 Net income tax payments $ 617 $ 959 $ 871 The reported tax provision differs from the amounts paid because some income and expense items are recognized in different time periods for financial reporting than for income tax purposes. State and local income taxes allocable to U.S. government contracts are included in operating costs and expenses in the Consolidated Statement of Earnings and, therefore, are not included in the provision above. The reconciliation from the statutory federal income tax rate to our effective income tax rate follows: Year Ended December 31 2017 2016 2015 Statutory federal income tax rate 35.0 % 35.0 % 35.0 % State tax on commercial operations, net of federal benefits 0.6 0.6 0.5 Impact of international operations (4.5 ) (4.0 ) (1.3 ) Domestic production deduction (1.5 ) (1.5 ) (1.6 ) Equity-based compensation (2.6 ) (2.3 ) — Domestic tax credits (0.8 ) (0.9 ) (1.1 ) Contract close-outs — — (2.8 ) Impact of enacted change in U.S. tax law 2.9 — — Other, net (0.5 ) (0.2 ) (0.7 ) Effective income tax rate 28.6 % 26.7 % 28.0 % Net Deferred Tax Asset (Liability). The tax effects of temporary differences between reported earnings and taxable income consisted of the following: December 31 2017 2016 Retirement benefits $ 935 $ 1,461 Tax loss and credit carryforwards 437 480 Salaries and wages 137 257 Workers’ compensation 139 235 Other 335 396 Deferred assets 1,983 2,829 Valuation allowances (402 ) (406 ) Net deferred assets $ 1,581 $ 2,423 Intangible assets $ (688 ) $ (1,049 ) Contract accounting methods (500 ) (188 ) Property, plant and equipment (182 ) (320 ) Capital Construction Fund qualified ships (159 ) (240 ) Other (221 ) (245 ) Deferred liabilities $ (1,750 ) $ (2,042 ) Net deferred tax (liability) asset $ (169 ) $ 381 Our deferred tax assets and liabilities are included in other noncurrent assets and liabilities on the Consolidated Balance Sheet. Our net deferred tax asset (liability) consisted of the following: December 31 2017 2016 Deferred tax asset $ 75 $ 564 Deferred tax liability (244 ) (183 ) Net deferred tax (liability) asset $ (169 ) $ 381 We believe it is more likely than not that we will generate sufficient taxable income in future periods to realize our deferred tax assets, subject to the valuation allowances recognized. Our retirement benefits deferred tax balance includes a deferred tax asset of $1 billion on December 31, 2017 , and $1.7 billion on December 31, 2016 , related to the amounts recorded in accumulated other comprehensive loss (AOCL) to recognize the funded status of our retirement plans. See Notes M and Q for additional details. One of our deferred tax liabilities results from our participation in the Capital Construction Fund (CCF), a program established by the U.S. government and administered by the Maritime Administration that supports the acquisition, construction, reconstruction or operation of U.S. flag merchant marine vessels. The program allows us to defer federal and state income taxes on earnings derived from eligible programs as long as the proceeds are deposited in the fund and withdrawals are used for qualified activities. We had U.S. government accounts receivable pledged (and thereby deposited) to the CCF of $692 and $388 on December 31, 2017 and 2016 , respectively. On December 31, 2017 , we had net operating loss carryforwards of $1 billion that begin to expire in 2019, a capital loss carryforward of $234 that expires in 2020 and tax credit carryforwards of $123 that begin to expire in 2018. Tax Uncertainties. For all periods open to examination by tax authorities, we periodically assess our liabilities and contingencies based on the latest available information. Where we believe there is more than a 50% chance that our tax position will not be sustained, we record our best estimate of the resulting tax liability, including interest, in the Consolidated Financial Statements. We include any interest or penalties incurred in connection with income taxes as part of income tax expense. The total amount of these tax liabilities on December 31, 2017 , was not material to our results of operations, financial condition or cash flows. We participate in the IRS Compliance Assurance Process (CAP), a real-time audit of our consolidated federal corporate income tax return. The IRS has examined our consolidated federal income tax returns through 2016. We do not expect the resolution of tax matters for open years to have a material impact on our results of operations, financial condition, cash flows or effective tax rate. Based on all known facts and circumstances and current tax law, we believe the total amount of any unrecognized tax benefits on December 31, 2017 , was not material to our results of operations, financial condition or cash flows, and if recognized, would not have a material impact on our effective tax rate. In addition, there are no tax positions for which it is reasonably possible that the unrecognized tax benefits will vary significantly over the next 12 months, producing, individually or in the aggregate, a material effect on our results of operations, financial condition or cash flows.

Accounts Receivable

Accounts Receivable	12 Months Ended
	Dec. 31, 2017
Accounts Receivable, Net [Abstract]
Accounts Receivable	ACCOUNTS RECEIVABLE Accounts receivable represent amounts billed and currently due from customers. Payment is typically received from our customers either at periodic intervals (e.g., biweekly or monthly) or upon achievement of contractual milestones. Accounts receivable consisted of the following: December 31 2017 2016 Non-U.S. government $ 2,228 $ 2,147 U.S. government 971 793 Commercial 418 459 Total accounts receivable $ 3,617 $ 3,399 Receivables from non-U.S. government customers included amounts related to long-term production programs for the Spanish Ministry of Defence of $2.1 billion on December 31, 2017 . A different ministry, the Spanish Ministry of Industry, has funded work on these programs in advance of costs incurred by the company. The cash advances are reported on the Consolidated Balance Sheet in current customer advances and deposits and will be repaid to the Ministry of Industry as we collect on the outstanding receivables from the Ministry of Defence. The net amount for these programs on December 31, 2017 , was an advance payment of $284 . With respect to our other receivables, we expect to collect substantially all of the year-end 2017 balance during 2018 .

Unbilled Receivables

Unbilled Receivables	12 Months Ended
	Dec. 31, 2017
Contractors [Abstract]
Unbilled Receivables	UNBILLED RECEIVABLES Unbilled receivables represent revenue recognized on long-term contracts (contract costs and estimated profits) less associated advances and progress billings. These amounts will be billed in accordance with the agreed-upon contractual terms or upon achievement of contractual milestones. Unbilled receivables consisted of the following: December 31 2017 2016 Unbilled revenue $ 21,845 $ 25,543 Advances and progress billings (16,605 ) (21,331 ) Net unbilled receivables $ 5,240 $ 4,212 The increase in net unbilled receivables was due primarily to the timing of billings on large international vehicle contracts in our Combat Systems group. G&A costs in unbilled revenue on December 31, 2017 and 2016 , were $282 and $234 , respectively. Contract costs also may include estimated contract recoveries for matters such as contract changes and claims for unanticipated contract costs. We record revenue associated with these matters only when the amount of recovery can be estimated reliably and realization is probable. We expect to bill all but approximately 20% of our year-end 2017 net unbilled receivables balance during 2018 . The amount not expected to be billed in 2018 results primarily from the agreed-upon contractual billing terms.

Inventories

Inventories	12 Months Ended
	Dec. 31, 2017
Inventory Disclosure [Abstract]
Inventories	INVENTORIES The majority of our inventories are for business-jet aircraft. Our inventories are stated at the lower of cost or net realizable value. Work in process represents largely labor, material and overhead costs associated with aircraft in the manufacturing process and is based primarily on the estimated average unit cost in a production lot. Raw materials are valued primarily on the first-in, first-out method. We record pre-owned aircraft acquired in connection with the sale of new aircraft at the lower of the trade-in value or the estimated net realizable value. Inventories consisted of the following: December 31 2017 2016 Work in process $ 3,872 $ 3,643 Raw materials 1,357 1,429 Finished goods 51 24 Pre-owned aircraft 23 22 Total inventories $ 5,303 $ 5,118

Property, Plant And Equipment,

Property, Plant And Equipment, Net	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Property, Plant And Equipment, Net	PROPERTY, PLANT AND EQUIPMENT, NET Property, plant and equipment (PP&E) is carried at historical cost, net of accumulated depreciation. The major classes of PP&E were as follows: December 31 2017 2016 Machinery and equipment $ 4,736 $ 4,582 Buildings and improvements 2,837 2,745 Land and improvements 357 333 Construction in process 307 269 Total PP&E 8,237 7,929 Accumulated depreciation (4,720 ) (4,452 ) PP&E, net $ 3,517 $ 3,477 We depreciate most of our assets using the straight-line method and the remainder using accelerated methods. Buildings and improvements are depreciated over periods of up to 50 years . Machinery and equipment are depreciated over periods of up to 30 years . Our government customers provide certain facilities and equipment for our use that are not included above.

Debt

Debt	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Debt	DEBT Debt consisted of the following: December 31 2017 2016 Fixed-rate notes due: Interest rate: November 2017 1.000% $ — $ 900 July 2021 3.875% 500 500 November 2022 2.250% 1,000 1,000 August 2023 1.875% 500 500 November 2024 2.375% 500 — August 2026 2.125% 500 500 November 2027 2.625% 500 — November 2042 3.600% 500 500 Other Various 32 24 Total debt principal 4,032 3,924 Less unamortized debt issuance costs and discounts 50 36 Total debt 3,982 3,888 Less current portion 2 900 Long-term debt $ 3,980 $ 2,988 In the third quarter of 2017 , we issued $1 billion of fixed-rate notes. We used the proceeds to repay $900 of fixed-rate notes that matured in the fourth quarter of 2017 and for general corporate purposes. Interest payments associated with our debt were $93 in 2017 , $83 in 2016 and $90 in 2015 . Our fixed-rate notes are fully and unconditionally guaranteed by several of our 100 %-owned subsidiaries. See Note S for condensed consolidating financial statements. We have the option to redeem the notes prior to their maturity in whole or in part for the principal plus any accrued but unpaid interest and applicable make-whole amounts. The aggregate amounts of scheduled principal maturities of our debt for the next five years are as follows: Year Ended December 31 2018 $ 2 2019 3 2020 3 2021 503 2022 1,003 Thereafter 2,518 Total debt principal $ 4,032 On December 31, 2017 , we had no commercial paper outstanding, but we maintain the ability to access the commercial paper market in the future . We have $2 billion in committed bank credit facilities for general corporate purposes and working capital needs. These credit facilities include a $1 billion multi-year facility expiring in July 2018 and a $1 billion multi-year facility expiring in November 2020 . We may renew or replace these credit facilities in whole or in part at or prior to their expiration dates. Our bank credit facilities are guaranteed by several of our 100 %-owned subsidiaries. We also have an effective shelf registration on file with the SEC that allows us to access the debt markets . Our financing arrangements contain a number of customary covenants and restrictions. We were in compliance with all covenants on December 31, 2017 .

Other Liabilities

Other Liabilities	12 Months Ended
	Dec. 31, 2017
Other Liabilities Disclosure [Abstract]
Other Liabilities	OTHER LIABILITIES A summary of significant other liabilities by balance sheet caption follows: December 31 2017 2016 Salaries and wages $ 786 $ 693 Fair value of cash flow hedges 180 521 Workers’ compensation 320 337 Retirement benefits 295 303 Other (a) 1,317 1,331 Total other current liabilities $ 2,898 $ 3,185 Retirement benefits $ 4,408 $ 4,393 Customer deposits on commercial contracts 814 719 Deferred income taxes 244 183 Other (b) 1,066 1,138 Total other liabilities $ 6,532 $ 6,433 (a) Consists primarily of dividends payable, taxes payable, environmental remediation reserves, warranty reserves, deferred revenue and supplier contributions in the Aerospace group, liabilities of discontinued operations, and insurance-related costs. (b) Consists primarily of warranty reserves, workers’ compensation liabilities and liabilities of discontinued operations.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2017
Stockholders' Equity Note [Abstract]
Shareholders' Equity	SHAREHOLDERS’ EQUITY Authorized Stock. Our authorized capital stock consists of 500 million shares of $1 per share par value common stock and 50 million shares of $1 per share par value preferred stock. The preferred stock is issuable in series, with the rights, preferences and limitations of each series to be determined by our board of directors. Shares Issued and Outstanding. On December 31, 2017 , we had 481,880,634 shares of common stock issued and 296,895,608 shares of common stock outstanding, including unvested restricted stock of 817,484 shares. On December 31, 2016 , we had 481,880,634 shares of common stock issued and 302,418,528 shares of common stock outstanding. No shares of our preferred stock were outstanding on either date. The only changes in our shares outstanding during 2017 and 2016 resulted from shares repurchased in the open market and share activity under our equity compensation plans. See Note P for additional details. Share Repurchases. Our board of directors authorizes management’s repurchase of outstanding shares of our common stock on the open market from time to time. On March 1, 2017, the board of directors authorized management to repurchase up to 10 million additional shares of the company’s outstanding stock. In 2017 , we repurchased 7.8 million of our outstanding shares for $1.5 billion . On December 31, 2017 , 7.6 million shares remained authorized by our board of directors for repurchase, approximately 3% of our total shares outstanding. We repurchased 14.2 million shares for $2 billion in 2016 and 22.8 million shares for $3.2 billion in 2015 . Dividends per Share. Dividends declared per share were $3.36 in 2017 , $3.04 in 2016 and $2.76 in 2015 . Cash dividends paid were $986 in 2017 , $911 in 2016 and $873 in 2015 . Accumulated Other Comprehensive Loss. The changes, pretax and net of tax, in each component of accumulated other comprehensive loss (AOCL) consisted of the following: Losses on Cash Flow Hedges Unrealized Gains on Securities Foreign Currency Translation Adjustments Changes in Retirement Plans’ Funded Status AOCL December 31, 2014 $ (173 ) $ 22 $ 541 $ (3,322 ) $ (2,932 ) Other comprehensive loss, pretax (394 ) (2 ) (371 ) 500 (267 ) Provision for income tax, net (80 ) — (11 ) 175 84 Other comprehensive loss, net of tax (314 ) (2 ) (360 ) 325 (351 ) December 31, 2015 (487 ) 20 181 (2,997 ) (3,283 ) Other comprehensive loss, pretax 191 (9 ) (112 ) (192 ) (122 ) Benefit for income tax, net 49 (3 ) — (64 ) (18 ) Other comprehensive loss, net of tax 142 (6 ) (112 ) (128 ) (104 ) December 31, 2016 (345 ) 14 69 (3,125 ) (3,387 ) Other comprehensive income, pretax 341 9 348 20 718 Provision for income tax, net 90 4 15 42 151 Other comprehensive income, net of tax 251 5 333 (22 ) 567 December 31, 2017 $ (94 ) $ 19 $ 402 $ (3,147 ) $ (2,820 ) Amounts reclassified out of AOCL related primarily to changes in retirement plans’ funded status and consisted of pretax recognized net actuarial losses of $358 in 2017 , $340 in 2016 and $423 in 2015 . This was offset partially by pretax amortization of prior service credit of $69 in 2017 , $74 in 2016 and $72 in 2015 . These AOCL components are included in our net periodic pension and other post-retirement benefit cost. See Note Q for additional details.

Derivative Instruments And Hedg

Derivative Instruments And Hedging Activities	12 Months Ended
	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments And Hedging Activities	DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES We are exposed to market risk, primarily from foreign currency exchange rates, interest rates, commodity prices and investments. We may use derivative financial instruments to hedge some of these risks as described below. We had $4.3 billion in notional forward exchange contracts outstanding on December 31, 2017 , and $6.3 billion on December 31, 2016 . We do not use derivative financial instruments for trading or speculative purposes. We recognize derivative financial instruments on the Consolidated Balance Sheet at fair value. See Note E for additional details. Foreign Currency Risk and Hedging Activities. Our foreign currency exchange rate risk relates to receipts from customers, payments to suppliers and inter-company transactions denominated in foreign currencies. To the extent possible, we include terms in our contracts that are designed to protect us from this risk. Otherwise, we enter into derivative financial instruments, principally foreign currency forward purchase and sale contracts, designed to offset and minimize our risk. The dollar-weighted three -year average maturity of these instruments generally matches the duration of the activities that are at risk. We record changes in the fair value of derivative financial instruments in operating costs and expenses in the Consolidated Statement of Earnings or in other comprehensive loss (OCL) within the Consolidated Statement of Comprehensive Income depending on whether the derivative is designated and qualifies for hedge accounting. Gains and losses related to derivative financial instruments that qualify as cash flow hedges are deferred in OCL until the underlying transaction is reflected in earnings. We adjust derivative financial instruments not designated as cash flow hedges to market value each period and record the gain or loss in the Consolidated Statement of Earnings. The gains and losses on these instruments generally offset losses and gains on the assets, liabilities and other transactions being hedged. Gains and losses resulting from hedge ineffectiveness are recognized in the Consolidated Statement of Earnings for all derivative financial instruments, regardless of designation. Net gains and losses on derivative financial instruments recognized in earnings, including gains and losses related to hedge ineffectiveness, were not material to our results of operations in any of the past three years. Net gains and losses reclassified to earnings from OCL were not material to our results of operations in any of the past three years, and we do not expect the amount of these gains and losses that will be reclassified to earnings in 2018 to be material. We had no material derivative financial instruments designated as fair value or net investment hedges on December 31, 2017 or 2016 . Interest Rate Risk. Our financial instruments subject to interest rate risk include fixed-rate long-term debt obligations and variable-rate commercial paper. However, the risk associated with these instruments is not material. Commodity Price Risk. We are subject to rising labor and commodity price risk, primarily on long-term, fixed-price contracts. To the extent possible, we include terms in our contracts that are designed to protect us from these risks. Some of the protective terms included in our contracts are considered derivative financial instruments but are not accounted for separately, because they are clearly and closely related to the host contract. We have not entered into any material commodity hedging contracts but may do so as circumstances warrant. We do not believe that changes in labor or commodity prices will have a material impact on our results of operations or cash flows. Investment Risk. Our investment policy allows for purchases of fixed-income securities with an investment-grade rating and a maximum maturity of up to five years. On December 31, 2017 , we held $3 billion in cash and equivalents, but held no marketable securities other than those held in trust to meet some of our obligations under workers’ compensation and non-qualified supplemental executive retirement plans . On December 31, 2017 , these marketable securities totaled $191 and were reflected at fair value on our Consolidated Balance Sheet in other current and noncurrent assets . Foreign Currency Financial Statement Translation. We translate foreign currency balance sheets from our international businesses’ functional currency (generally the respective local currency) to U.S. dollars at end-of-period exchange rates, and statements of earnings at average exchange rates for each period. The resulting foreign currency translation adjustments are a component of OCL. We do not hedge the fluctuation in reported revenue and earnings resulting from the translation of these international operations’ results into U.S. dollars. The impact of translating our non-U.S. operations’ revenue into U.S. dollars was not material to our results of operations in any of the past three years. In addition, the effect of changes in foreign exchange rates on non-U.S. cash balances was not material in each of the past three years.

Commitments And Contingencies

Commitments And Contingencies	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies	COMMITMENTS AND CONTINGENCIES Litigation In 2015, Electric Boat Corporation, a subsidiary of General Dynamics Corporation, received a Civil Investigative Demand from the U.S. Department of Justice regarding an investigation of potential False Claims Act violations relating to alleged failures of Electric Boat’s quality system with respect to allegedly non-conforming parts purchased from a supplier. In 2016, Electric Boat was made aware that it is a defendant in a lawsuit related to this matter filed under seal in U.S. district court. Also in 2016, the Suspending and Debarring Official for the U.S. Department of the Navy issued a Show Cause Letter to Electric Boat requesting that Electric Boat respond to the official’s concerns regarding Electric Boat’s oversight and management with respect to its quality assurance systems for subcontractors and suppliers. Electric Boat responded to the Show Cause Letter and has been engaged in discussions with the U.S. government. Given the current status of these matters, we are unable to express a view regarding the ultimate outcome or, if the outcome is adverse, to estimate an amount or range of reasonably possible loss. Depending on the outcome of these matters, there could be a material impact on our results of operations, financial condition and cash flows. Additionally, various other claims and legal proceedings incidental to the normal course of business are pending or threatened against us. These other matters relate to such issues as government investigations and claims, the protection of the environment , asbestos-related claims and employee-related matters. The nature of litigation is such that we cannot predict the outcome of these other matters. However, based on information currently available, we believe any potential liabilities in these other proceedings, individually or in the aggregate, will not have a material impact on our results of operations, financial condition or cash flows. Environmental We are subject to and affected by a variety of federal, state, local and foreign environmental laws and regulations. We are directly or indirectly involved in environmental investigations or remediation at some of our current and former facilities and third-party sites that we do not own but where we have been designated a Potentially Responsible Party (PRP) by the U.S. Environmental Protection Agency or a state environmental agency. Based on historical experience, we expect that a significant percentage of the total remediation and compliance costs associated with these facilities will continue to be allowable contract costs and, therefore, recoverable under U.S. government contracts. As required, we provide financial assurance for certain sites undergoing or subject to investigation or remediation. We accrue environmental costs when it is probable that a liability has been incurred and the amount can be reasonably estimated. Where applicable, we seek insurance recovery for costs related to environmental liabilities. We do not record insurance recoveries before collection is considered probable. Based on all known facts and analyses, we do not believe that our liability at any individual site, or in the aggregate, arising from such environmental conditions will be material to our results of operations, financial condition or cash flows. We also do not believe that the range of reasonably possible additional loss beyond what has been recorded would be material to our results of operations, financial condition or cash flows. Minimum Lease Payments Total expense under operating leases was $309 in 2017 , $307 in 2016 and $283 in 2015 . Operating leases are primarily for facilities and equipment. Future minimum lease payments are as follows: Year Ended December 31 2018 $ 258 2019 215 2020 148 2021 118 2022 94 Thereafter 526 Total minimum lease payments $ 1,359 Other Government Contracts. As a government contractor, we are subject to U.S. government audits and investigations relating to our operations, including claims for fines, penalties, and compensatory and treble damages. We believe the outcome of such ongoing government audits and investigations will not have a material impact on our results of operations, financial condition or cash flows. In the performance of our contracts, we routinely request contract modifications that require additional funding from the customer. Most often, these requests are due to customer-directed changes in the scope of work. While we are entitled to recovery of these costs under our contracts, the administrative process with our customer may be protracted. Based on the circumstances, we periodically file requests for equitable adjustment (REAs) that are sometimes converted into claims. In some cases, these requests are disputed by our customer. We believe our outstanding modifications, REAs and other claims will be resolved without material impact to our results of operations, financial condition or cash flows. Letters of Credit and Guarantees. In the ordinary course of business, we have entered into letters of credit, bank guarantees, surety bonds and other similar arrangements with financial institutions and insurance carriers totaling approximately $1.2 billion on December 31, 2017 . In addition, from time to time and in the ordinary course of business, we contractually guarantee the payment or performance of our subsidiaries arising under certain contracts. Aircraft Trade-ins. In connection with orders for new aircraft in funded contract backlog, our Aerospace group has outstanding options with some customers to trade in aircraft as partial consideration in their new-aircraft transaction. These trade-in commitments are generally structured to establish the fair market value of the trade-in aircraft at a date generally 45 or fewer days preceding delivery of the new aircraft to the customer. At that time, the customer is required to either exercise the option or allow its expiration. Any excess of the pre-established trade-in price above the fair market value at the time the new aircraft is delivered is treated as a reduction of revenue in the new-aircraft sales transaction. Labor Agreements. Approximately one-fifth of the employees of our subsidiaries work under collectively-bargained terms and conditions, including 47 collective agreements that we have negotiated directly with unions and works councils. A number of these agreements expire within any given year. Historically, we have been successful at renegotiating these labor agreements without any material disruption of operating activities. In 2018 , we expect to negotiate the terms of 15 agreements covering approximately 2,000 employees. We do not expect the renegotiations will, either individually or in the aggregate, have a material impact on our results of operations, financial condition or cash flows. Product Warranties. We provide warranties to our customers associated with certain product sales. We record estimated warranty costs in the period in which the related products are delivered. The warranty liability recorded at each balance sheet date is generally based on the number of months of warranty coverage remaining for the products delivered and the average historical monthly warranty payments. Warranty obligations incurred in connection with long-term production contracts are accounted for within the contract estimates at completion. Our other warranty obligations, primarily for business-jet aircraft, are included in other current and noncurrent liabilities on the Consolidated Balance Sheet. The changes in the carrying amount of warranty liabilities for each of the past three years were as follows: Year Ended December 31 2017 2016 2015 Beginning balance $ 474 $ 434 $ 428 Warranty expense 146 155 162 Payments (123 ) (100 ) (120 ) Adjustments* (30 ) (15 ) (36 ) Ending balance $ 467 $ 474 $ 434 * Includes a cumulative-effect adjustment on January 1, 2015, which represents the impact of adopting ASC Topic 606.

Equity Compensation Plans

Equity Compensation Plans	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity Compensation Plans	EQUITY COMPENSATION PLANS Equity Compensation Overview. We have equity compensation plans for employees, as well as for non-employee members of our board of directors. The equity compensation plans seek to provide an effective means of attracting and retaining directors, officers and key employees, and to provide them with incentives to enhance our growth and profitability. Under the equity compensation plans, awards may be granted to officers, employees or non-employee directors in common stock, options to purchase common stock, restricted shares of common stock, participation units or any combination of these. Annually, we grant awards of stock options, restricted stock and RSUs to participants in our equity compensation plans in early March. Additionally, we may make limited ad hoc grants on a quarterly basis for new hires or promotions. We issue common stock under our equity compensation plans from treasury stock. On December 31, 2017 , in addition to the shares reserved for issuance upon the exercise of outstanding stock options, approximately 6 million shares have been authorized for awards that may be granted in the future. Equity-based Compensation Expense. Equity-based compensation expense is included in G&A expenses. The following table details the components of equity-based compensation expense recognized in net earnings in each of the past three years: Year Ended December 31 2017 2016 2015 Stock options $ 34 $ 25 $ 32 Restricted stock/RSUs 46 36 32 Total equity-based compensation expense, net of tax $ 80 $ 61 $ 64 Stock Options. Stock options granted under our equity compensation plans are issued with an exercise price at the fair value of our common stock determined by the average of the high and low stock prices as listed on the New York Stock Exchange on the date of grant. The majority of our outstanding stock options vest over three years, with 50% of the options vesting after two years and the remaining 50% vesting the following year, and expire 10 years after the grant date. We recognize compensation expense related to stock options on a straight-line basis over the vesting period of the awards, net of estimated forfeitures. Estimated forfeitures are based on our historical forfeiture experience. We estimate the fair value of stock options on the date of grant using the Black-Scholes option pricing model with the following assumptions for each of the past three years: Year Ended December 31 2017 2016 2015 Expected volatility 17.3-19.4% 19.1-20.0% 20.1-24.1% Weighted average expected volatility 19.4 % 20.0 % 24.0 % Expected term (in months) 68 70 74 Risk-free interest rate 2.0-2.2% 1.5-1.6% 1.7-1.9% Expected dividend yield 1.8 % 2.0 % 2.0 % We determine the above assumptions based on the following: • Expected volatility is based on the historical volatility of our common stock over a period equal to the expected term of the option. • Expected term is based on assumptions used by a set of comparable peer companies. • Risk-free interest rate is the yield on a U.S. Treasury zero-coupon issue with a remaining term equal to the expected term of the option at the grant date. • Expected dividend yield is based on our historical dividend yield. The resulting weighted average fair value per stock option granted (in dollars) was $33.09 in 2017 , $22.11 in 2016 and $27.54 in 2015 . Stock option expense reduced pretax operating earnings (and on a diluted per-share basis) by $53 ( $0.11 ) in 2017 , $39 ( $0.08 ) in 2016 and $49 ( $0.10 ) in 2015 . Compensation expense for stock options is reported as a Corporate expense for segment reporting purposes (see Note R). On December 31, 2017 , we had $71 of unrecognized compensation cost related to stock options, which is expected to be recognized over a weighted average period of 1.8 years . A summary of stock option activity during 2017 follows: In Shares and Dollars Shares Under Option Weighted Average Exercise Price Per Share Outstanding on December 31, 2016 10,934,621 $ 108.23 Granted 1,870,260 191.84 Exercised (2,020,882 ) 88.75 Forfeited/canceled (163,610 ) 145.72 Outstanding on December 31, 2017 10,620,389 $ 126.08 Vested and expected to vest on December 31, 2017 10,470,666 $ 125.45 Exercisable on December 31, 2017 5,286,882 $ 96.52 Summary information with respect to our stock options’ intrinsic value and remaining contractual term on December 31, 2017 , follows: Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value Outstanding 5.7 $ 822 Vested and expected to vest 5.6 817 Exercisable 3.1 565 In the table above, intrinsic value is calculated as the excess, if any, of the market price of our stock on the last trading day of the year over the exercise price of the options. For stock options exercised, intrinsic value is calculated as the difference between the market price on the date of exercise and the exercise price. The total intrinsic value of stock options exercised was $215 in 2017 , $263 in 2016 and $238 in 2015 . Restricted Stock/RSUs. The fair value of restricted stock and RSUs equals the average of the high and low market prices of our common stock as listed on the New York Stock Exchange on the date of grant. Grants of restricted stock are awards of shares of common stock. Participation units represent obligations that have a value derived from or related to the value of our common stock. These include stock appreciation rights, phantom stock units and RSUs, and are payable in cash or common stock. Restricted stock and RSUs generally vest over a three -year restriction period after the grant date, during which recipients may not sell, transfer, pledge, assign or otherwise convey their restricted shares to another party. During this period, restricted stock recipients receive cash dividends on their restricted shares and are entitled to vote those shares, while RSU recipients receive dividend-equivalent units instead of cash dividends and are not entitled to vote their RSUs or dividend-equivalent units. We grant RSUs with a performance measure derived from a non-GAAP-based management metric, return on invested capital (ROIC). Depending on the company’s performance with respect to this metric, the number of RSUs earned may be less than, equal to or greater than the original number of RSUs awarded subject to a payout range. We generally recognize compensation expense related to restricted stock and RSUs on a straight-line basis over the vesting period of the awards. Compensation expense related to restricted stock and RSUs reduced pretax operating earnings (and on a diluted per-share basis) by $70 ( $0.15 ) in 2017 , $56 ( $0.12 ) in 2016 and $49 ( $0.10 ) in 2015 . Compensation expense for restricted stock and RSUs is reported as an operating expense of our business groups for segment reporting purposes (see Note R). On December 31, 2017 , we had $47 of unrecognized compensation cost related to restricted stock and RSUs, which is expected to be recognized over a weighted average period of 1.6 years . A summary of restricted stock and RSU activity during 2017 follows: In Shares and Dollars Shares/ Share-Equivalent Units Weighted Average Grant-Date Fair Value Per Share Nonvested at December 31, 2016 2,806,128 $ 101.54 Granted 341,558 191.83 Vested (1,139,028 ) 67.80 Forfeited (25,485 ) 142.37 Nonvested at December 31, 2017 1,983,173 $ 135.38 The total fair value of vesting shares was $200 in 2017 , $68 in 2016 and $76 in 2015 .

Retirement Plans

Retirement Plans	12 Months Ended
	Dec. 31, 2017
Retirement Benefits [Abstract]
Retirement Plans	RETIREMENT PLANS We provide defined-contribution benefits to eligible employees, as well as some remaining defined-benefit pension and other post-retirement benefits. Substantially all of our plans use a December 31 measurement date consistent with our fiscal year. Retirement Plan Summary Information Defined-contribution Benefits. We provide eligible employees the opportunity to participate in defined-contribution savings plans (commonly known as 401(k) plans), which permit contributions on a before-tax and after-tax basis. Employees may contribute to various investment alternatives. In most of these plans, we match a portion of the employees’ contributions. Our contributions to these plans totaled $274 in 2017 , $261 in 2016 and $240 in 2015 . The defined-contribution plans held approximately 21 million and 22 million shares of our common stock, representing approximately 7% of our outstanding shares on December 31, 2017 and 2016 , respectively. Pension Benefits. We have seven noncontributory and five contributory trusteed, qualified defined-benefit pension plans covering eligible government business employees, and two noncontributory and four contributory plans covering eligible commercial business employees, including some employees of our international operations. The primary factors affecting the benefits earned by participants in our pension plans are employees’ years of service and compensation levels. Our primary government pension plans, which comprise the majority of our unfunded obligation, were closed to new salaried participants on January 1, 2007. Additionally, we made changes to these plans for certain participants effective in 2014 that limit or cease the benefits that accrue for future service. We made similar changes to our primary commercial pension plan in 2015. We also sponsor one funded and several unfunded non-qualified supplemental executive retirement plans, which provide participants with additional benefits, including excess benefits over limits imposed on qualified plans by federal tax law. Other Post-retirement Benefits. We maintain plans that provide post-retirement healthcare and life insurance coverage for certain employees and retirees. These benefits vary by employment status, age, service and salary level at retirement. The coverage provided and the extent to which the retirees share in the cost of the program vary throughout the company. The plans provide health and life insurance benefits only to those employees who retire directly from our service and not to those who terminate service prior to eligibility for retirement. Contributions and Benefit Payments It is our policy to fund our defined-benefit retirement plans in a manner that optimizes the tax deductibility and contract recovery of contributions considered within our capital deployment framework. Therefore, we may make discretionary contributions in addition to the required contributions determined in accordance with IRS regulations. We contributed $199 to our pension plans in 2017 . In 2018 , our required contributions are approximately $315 . We maintain several tax-advantaged accounts, primarily Voluntary Employees’ Beneficiary Association (VEBA) trusts, to fund the obligations for some of our other post-retirement benefit plans. For non-funded plans, claims are paid as received. Contributions to our other post-retirement plans were not material in 2017 and are not expected to be material in 2018 . We expect the following benefits to be paid from our retirement plans over the next 10 years: Pension Benefits Other Post-retirement 2018 $ 626 $ 64 2019 648 64 2020 676 63 2021 704 63 2022 730 62 2023-2027 4,013 292 Government Contract Considerations Our contractual arrangements with the U.S. government provide for the recovery of contributions to our pension and other post-retirement benefit plans covering employees working in our defense business groups. For non-funded plans, our government contracts allow us to recover claims paid. Following payment, these recoverable amounts are allocated to contracts and billed to the customer in accordance with the Cost Accounting Standards (CAS) and specific contractual terms. For some of these plans, the cumulative pension and other post-retirement benefit cost exceeds the amount currently allocable to contracts. To the extent recovery of the cost is considered probable based on our backlog and probable follow-on contracts, we defer the excess in other contract costs in other current assets on the Consolidated Balance Sheet until the cost is allocable to contracts. See Note A for a discussion of our other contract costs. For other plans, the amount allocated to contracts and included in revenue has exceeded the plans’ cumulative benefit cost. We have deferred recognition of these excess earnings on the Consolidated Balance Sheet. Defined-benefit Retirement Plan Summary Financial Information Estimating retirement plan assets, liabilities and costs requires the extensive use of actuarial assumptions. These include the long-term rate of return on plan assets, the interest rates used to discount projected benefit payments, healthcare cost trend rates and future salary increases. Given the long-term nature of the assumptions being made, actual outcomes can and often do differ from these estimates. Our annual benefit cost consists of three primary elements: the cost of benefits earned by employees for services rendered during the year, an interest charge on our plan liabilities and an assumed return on our plan assets for the year. The annual cost also includes gains and losses resulting from changes in actuarial assumptions, differences between the actual and assumed long-term rate of return on assets, and gains and losses resulting from changes we make to plan benefit terms. We recognize an asset or liability on the Consolidated Balance Sheet equal to the funded status of each of our defined-benefit retirement plans. The funded status is the difference between the fair value of the plan’s assets and its benefit obligation. Changes in plan assets and liabilities due to differences between actuarial assumptions and the actual results of the plan are deferred in OCL rather than charged to earnings. These differences are then amortized over future years as a component of our annual benefit cost. We amortize actuarial differences under qualified plans on a straight-line basis over the average remaining service period of eligible employees. If all of a plan’s participants are inactive, we amortize these differences over the average remaining life expectancy of the plan participants. We recognize the difference between the actual and expected return on plan assets for qualified plans over five years. The deferral of these differences reduces the volatility of our annual benefit cost that can result either from year-to-year changes in the assumptions or from actual results that are not necessarily representative of the long-term financial position of these plans. We recognize differences under nonqualified plans immediately. Net annual defined-benefit pension and other post-retirement benefit cost (credit) consisted of the following: Pension Benefits Year Ended December 31 2017 2016 2015 Service cost $ 168 $ 173 $ 210 Interest cost 453 456 529 Expected return on plan assets (679 ) (713 ) (693 ) Recognized net actuarial loss 362 343 417 Amortization of prior service credit (66 ) (68 ) (67 ) Net annual benefit cost $ 238 $ 191 $ 396 Other Post-retirement Benefits Year Ended December 31 2017 2016 2015 Service cost $ 9 $ 10 $ 11 Interest cost 30 34 44 Expected return on plan assets (34 ) (33 ) (32 ) Recognized net actuarial (gain) loss (4 ) (3 ) 6 Amortization of prior service credit (3 ) (6 ) (5 ) Net annual benefit (credit) cost $ (2 ) $ 2 $ 24 The following is a reconciliation of the benefit obligations and plan/trust assets, and the resulting funded status, of our defined-benefit retirement plans: Pension Benefits Other Post-retirement Benefits Year Ended December 31 2017 2016 2017 2016 Change in Benefit Obligation Benefit obligation at beginning of year $ (13,022 ) $ (12,554 ) $ (1,005 ) $ (991 ) Service cost (168 ) (173 ) (9 ) (10 ) Interest cost (453 ) (456 ) (30 ) (34 ) Amendments 1 — — (13 ) Actuarial loss (1,098 ) (383 ) (42 ) (18 ) Settlement/curtailment/other (58 ) (4 ) 27 (3 ) Benefits paid 586 548 63 64 Benefit obligation at end of year $ (14,212 ) $ (13,022 ) $ (996 ) $ (1,005 ) Change in Plan/Trust Assets Fair value of assets at beginning of year $ 8,980 $ 8,608 $ 499 $ 527 Actual return on plan assets 1,469 694 82 9 Employer contributions 199 208 3 5 Settlement/curtailment/other 56 5 — — Benefits paid (574 ) (535 ) (43 ) (42 ) Fair value of assets at end of year $ 10,130 $ 8,980 $ 541 $ 499 Funded status at end of year $ (4,082 ) $ (4,042 ) $ (455 ) $ (506 ) Amounts recognized on the Consolidated Balance Sheet consisted of the following: Pension Benefits Other Post-retirement Benefits December 31 2017 2016 2017 2016 Noncurrent assets $ 133 $ 138 $ 33 $ 10 Current liabilities (145 ) (132 ) (150 ) (171 ) Noncurrent liabilities (4,070 ) (4,048 ) (338 ) (345 ) Net liability recognized $ (4,082 ) $ (4,042 ) $ (455 ) $ (506 ) Amounts deferred in AOCL consisted of the following: Pension Benefits Other Post-retirement Benefits December 31 2017 2016 2017 2016 Net actuarial loss (gain) $ 4,899 $ 4,947 $ (5 ) $ 36 Prior service credit (124 ) (190 ) (3 ) (6 ) Total amount recognized in AOCL, pretax $ 4,775 $ 4,757 $ (8 ) $ 30 The following is a reconciliation of the change in AOCL for our defined-benefit retirement plans: Pension Benefits Other Post-retirement Benefits Year Ended December 31 2017 2016 2017 2016 Net actuarial loss (gain) $ 308 $ 402 $ (6 ) $ 42 Prior service cost (1 ) — — 13 Amortization of: Net actuarial (loss) gain from prior years (362 ) (343 ) 4 3 Prior service credit 66 68 3 6 Other* 7 1 (39 ) — Change in AOCL, pretax $ 18 $ 128 $ (38 ) $ 64 * Includes foreign exchange translation, curtailment and other adjustments. The following table represents amounts deferred in AOCL on the Consolidated Balance Sheet on December 31, 2017 , that we expect to recognize in our retirement benefit cost in 2018 : Pension Other Post-retirement Net actuarial loss (gain) $ 387 $ (4 ) Prior service credit (44 ) (3 ) A pension plan’s funded status is the difference between the plan’s assets and its projected benefit obligation (PBO). The PBO is the present value of future benefits attributed to employee services rendered to date, including assumptions about future compensation levels. A pension plan’s accumulated benefit obligation (ABO) is the present value of future benefits attributed to employee services rendered to date, excluding assumptions about future compensation levels. The ABO for all defined-benefit pension plans was $13.9 billion and $12.7 billion on December 31, 2017 and 2016 , respectively. On December 31, 2017 and 2016 , some of our pension plans had an ABO that exceeded the plans’ assets. Summary information for those plans follows: December 31 2017 2016 PBO $ (13,660 ) $ (12,817 ) ABO (13,398 ) (12,557 ) Fair value of plan assets 9,526 8,722 Retirement Plan Assumptions We calculate the plan assets and liabilities for a given year and the net annual benefit cost for the subsequent year using assumptions determined as of December 31 of the year in question. The following table summarizes the weighted average assumptions used to determine our benefit obligations: Assumptions on December 31 2017 2016 Pension Benefits Benefit obligation discount rate 3.62 % 4.19 % Rate of increase in compensation levels 2.82 % 2.92 % Other Post-retirement Benefits Benefit obligation discount rate 3.64 % 4.11 % Healthcare cost trend rate: Trend rate for next year 6.50 % 6.50 % Ultimate trend rate 5.00 % 5.00 % Year rate reaches ultimate trend rate 2024 2024 The following table summarizes the weighted average assumptions used to determine our net annual benefit cost: Assumptions for Year Ended December 31 2017 2016 2015 Pension Benefits Discount rates: Benefit obligation 4.19 % 4.46 % 4.10 % Service cost 4.13 % 4.42 % * Interest cost 3.56 % 3.71 % * Expected long-term rate of return on assets 7.43 % 8.14 % 8.15 % Rate of increase in compensation levels 2.90 % 3.39 % 3.43 % Other Post-retirement Benefits Discount rates: Benefit obligation 4.11 % 4.35 % 4.03 % Service cost 4.34 % 4.52 % * Interest cost 3.43 % 3.53 % * Expected long-term rate of return on assets 7.76 % 7.81 % 8.03 % * Not applicable as we changed to the spot rate approach beginning in 2016 as further described below. We base the discount rates on a current yield curve developed from a portfolio of high-quality, fixed-income investments with maturities consistent with the projected benefit payout period. Beginning in 2016, we refined the method used to determine the service and interest cost components of our net annual benefit cost. Previously, the cost was determined using a single weighted-average discount rate derived from the yield curve described above. Under the refined method, known as the spot rate approach, we use individual spot rates along the yield curve that correspond with the timing of each service cost and discounted benefit obligation payment. We believe this change provides a more precise measurement of service and interest costs by improving the correlation between projected service cost and discounted benefit obligation cash outflows and corresponding spot rates on the yield curve. We accounted for this change prospectively as a change in accounting estimate. We determine the long-term rate of return on assets based on consideration of historical and forward-looking returns and the current and expected asset allocation strategy. In 2017, we decreased the expected long-term rate of return on assets in our primary U.S. government and commercial pension plans by 75 basis points following an assessment of the historical and expected long-term returns of our various asset classes. Retirement plan assumptions are based on our best judgment, including consideration of current and future market conditions. Changes in these estimates impact future pension and other post-retirement benefit cost. As discussed above, we defer recognition of the cumulative benefit cost for our government plans in excess of costs allocated to contracts and included in revenue. Therefore, the impact of annual changes in financial reporting assumptions on the cost for these plans does not immediately affect our operating results. For our U.S. pension plans that represent the majority of our total obligation, the following hypothetical changes in the discount rates and expected long-term rates of return on plan assets would have had the following impact in 2017 : Increase 25 Basis Points Decrease 25 Basis Points Increase (decrease) to net pension cost from: Change in discount rates $ (28 ) $ 30 Change in long-term rates of return on plan assets (21 ) 21 A 25-basis-point change in these assumed rates would not have had a measurable impact on the benefit cost for our other post-retirement plans in 2017 . For our healthcare plans, the effect of a 1% increase or decrease in the assumed healthcare cost trend rate on the 2017 net annual benefit cost is $4 and ($3) , respectively, and the effect on the December 31, 2017 , accumulated other post-retirement benefit obligation is $75 and ($60) , respectively. Plan Assets A committee of our board of directors is responsible for the strategic oversight of our defined-benefit retirement plan assets held in trust. Management develops investment policies and provides oversight of a third-party investment manager who reports to the committee on a regular basis. The outsourced third-party investment manager develops investment strategies and makes all day-to-day investment decisions related to defined-benefit retirement plan assets in accordance with our investment policy and target allocation percentages. Our investment policy endeavors to strike the appropriate balance among capital preservation, asset growth and current income. The objective of our investment policy is to generate future returns consistent with our assumed long-term rate of return used to determine our benefit obligations and net annual benefit cost. Target allocation percentages vary over time depending on the perceived risk and return potential of various asset classes and market conditions. At the end of 2017 , our asset allocation policy ranges were: Equities 48-68% Fixed income 20-48% Cash 0-5% Other asset classes 0-16% More than 90% of our pension plan assets are held in a single trust for our primary U.S. government and commercial pension plans. On December 31, 2017 , the trust was invested largely in publicly traded equities, fixed-income securities and commingled funds comprised of equity securities. The trust also invests in other asset classes consistent with our investment policy. Our investments in equity assets include U.S. and international securities and equity funds. Our investments in fixed-income assets include U.S. Treasury and U.S. agency securities, corporate bonds, mortgage-backed securities and other asset-backed securities. Our investment policy allows the use of derivative instruments when appropriate to reduce anticipated asset volatility, to gain exposure to an asset class or to adjust the duration of fixed-income assets. Assets for our non-U.S. pension plans are held in trusts in the countries in which the related operations reside. Our non-U.S. operations maintain investment policies for their individual plans based on country-specific regulations. The non-U.S. plan assets are invested primarily in commingled funds comprised of equity and fixed-income securities. We hold assets in VEBA trusts for some of our other post-retirement benefit plans. These assets are managed by a third-party investment manager with oversight by management and are generally invested in equities, fixed-income securities and commingled funds comprised of equity and fixed-income securities. Our asset allocation strategy for the VEBA trusts considers potential fluctuations in our other post-retirement benefit obligation, the taxable nature of certain VEBA trusts, tax deduction limits on contributions and the regulatory environment. Our retirement plan assets are reported at fair value. See Note E for a discussion of the hierarchy for determining fair value. Our Level 1 assets include investments in publicly traded equity securities. These securities are actively traded and valued using quoted prices for identical securities from the market exchanges. Our Level 2 assets consist of fixed-income securities and commingled funds whose underlying investments are valued using observable marketplace inputs. The fair value of plan assets invested in fixed-income securities is generally determined using valuation models that use observable inputs such as interest rates, bond yields, low-volume market quotes and quoted prices for similar assets. Our plan assets that are invested in commingled funds are valued using a unit price or net asset value (NAV) that is based on the underlying investments of the fund. Our Level 3 assets include real estate funds, insurance deposit contracts and direct private equity investments. Certain investments valued using NAV as a practical expedient are excluded from the fair value hierarchy. These investments are redeemable at NAV on a monthly or quarterly basis and have redemption notice periods of up to 90 days . We had no unfunded commitments related to these investments on December 31, 2017 or 2016 . The fair value of our pension plan assets by investment category and the corresponding level within the fair value hierarchy were as follows: Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Asset Category December 31, 2017 Cash and equivalents $ 48 $ — $ 48 $ — Equity securities (a): U.S. companies 770 770 — — Non-U.S. companies 97 97 — — Private equity investments 18 — — 18 Fixed-income securities: Treasury securities 1,361 — 1,361 — Corporate bonds (b) 1,604 — 1,604 — Commingled funds: Equity funds 5,018 — 5,018 — Fixed-income funds 325 — 325 — Real estate funds 51 — — 51 Other investments: Insurance deposit contracts 120 — — 120 Total plan assets in fair value hierarchy $ 9,412 $ 867 $ 8,356 $ 189 Plan assets measured using NAV as a practical expedient (c): Hedge funds 328 Real estate funds 390 Total pension plan assets $ 10,130 (a) No single equity holding amounted to more than 1% of the total fair value. (b) Our corporate bond investments had an average rating of A+ . (c) Investments measured at fair value using NAV as a practical expedient are not classified in the fair value hierarchy. The fair value amounts presented in this table for these investments are included to permit reconciliation of the fair value hierarchy to the total plan assets. Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Asset Category December 31, 2016 Cash and equivalents $ 71 $ 10 $ 61 $ — Equity securities (a): U.S. companies 786 786 — — Non-U.S. companies 74 74 — — Private equity investments 13 — — 13 Fixed-income securities: Treasury securities 239 — 239 — Corporate bonds (b) 2,115 — 2,115 — Commingled funds: Equity funds 4,285 — 4,285 — Fixed-income funds 567 — 567 — Real estate funds 42 — — 42 Other investments: Insurance deposit contracts 109 — — 109 Total plan assets in fair value hierarchy $ 8,301 $ 870 $ 7,267 $ 164 Plan assets measured using NAV as a practical expedient (c): Hedge funds 314 Real estate funds 365 Total pension plan assets $ 8,980 (a) No single equity holding amounted to more than 1% of the total fair value. (b) Our corporate bond investments had an average rating of BBB+ . (c) Investments measured at fair value using NAV as a practical expedient are not classified in the fair value hierarchy. The fair value amounts presented in this table for these investments are included to permit reconciliation of the fair value hierarchy to the total plan assets. The fair value of our other post-retirement plan assets by category and the corresponding level within the fair value hierarchy were as follows: Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Asset Category (a) December 31, 2017 Cash equivalents $ 18 $ — $ 18 Equity securities 70 70 — Fixed-income securities 89 — 89 Commingled funds: Equity funds 260 — 260 Fixed-income funds 99 — 99 Real estate funds 2 2 — Total plan assets in fair value hierarchy $ 538 $ 72 $ 466 Plan assets measured using NAV as a practical expedient (b): Hedge funds 1 Real estate funds 2 Total other post-retirement plan assets $ 541 (a) We had no Level 3 investments on December 31, 2017 . (b) Investments measured at fair value using NAV as a practical expedient are not classified in the fair value hierarchy. The fair value amounts presented in this table for these investments are included to permit reconciliation of the fair value hierarchy to the total plan assets. Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Asset Category (a) December 31, 2016 Cash equivalents $ 10 $ — $ 10 Equity securities 69 69 — Fixed-income securities 88 — 88 Commingled funds: Equity funds 236 — 236 Fixed-income funds 92 — 92 Real estate funds 2 2 — Total plan assets in fair value hierarchy $ 497 $ 71 $ 426 Plan assets measured using NAV as a practical expedient (b): Hedge funds 1 Real estate funds 1 Total other post-retirement plan assets $ 499 (a) We had no Level 3 investments on December 31, 2016 . (b) Investments measured at fair value using NAV as a practical expedient are not classified in the fair value hierarchy. The fair value amounts presented in this table for these investments are included to permit reconciliation of the fair value hierarchy to the total plan assets. Changes in our Level 3 retirement plan assets during 2017 and 2016 were as follows: Private Equity Investments Real Estate Funds Insurance Deposits Contracts Total Level 3 Assets December 31, 2015 $ 12 $ 42 $ 103 $ 157 Actual return on plan assets: Unrealized losses, net 1 — (2 ) (1 ) Realized gains, net — — 3 3 Purchases, sales and settlements, net — — 5 5 December 31, 2016 13 42 109 164 Actual return on plan assets: Unrealized gains, net 1 4 4 9 Realized gains, net — — 2 2 Purchases, sales and settlements, net 4 5 5 14 December 31, 2017 $ 18 $ 51 $ 120 $ 189

Business Group Information

Business Group Information	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Business Group Information	BUSINESS GROUP INFORMATION We operate in four business groups: Aerospace, Combat Systems, Information Systems and Technology, and Marine Systems. We organize our business groups in accordance with the nature of products and services offered. We measure each group’s profitability based on operating earnings. As a result, we do not allocate net interest, other income and expense items, and income taxes to our business groups. Summary financial information for each of our business groups follows: Revenue Operating Earnings Revenue from U.S. Government Year Ended December 31 2017 2016 2015 2017 2016 2015 2017 2016 2015 Aerospace $ 8,129 $ 7,815 $ 9,177 $ 1,593 $ 1,407 $ 1,807 $ 231 $ 361 $ 104 Combat Systems 5,949 5,530 5,643 937 831 886 3,084 2,614 2,590 Information Systems and Technology 8,891 9,144 8,929 1,011 941 895 7,793 7,984 7,821 Marine Systems 8,004 8,072 8,032 685 595 748 7,913 7,717 7,463 Corporate* — — — (49 ) (40 ) (41 ) — — — Total $ 30,973 $ 30,561 $ 31,781 $ 4,177 $ 3,734 $ 4,295 $ 19,021 $ 18,676 $ 17,978 * Corporate operating results consist primarily of stock option expense. Identifiable Assets Capital Expenditures Depreciation and Amortization Year Ended December 31 2017 2016 2015 2017 2016 2015 2017 2016 2015 Aerospace $ 10,126 $ 9,792 $ 9,411 $ 132 $ 125 $ 210 $ 147 $ 153 $ 146 Combat Systems 9,846 8,885 7,810 84 71 79 86 86 91 Information Systems and Technology 8,877 8,445 8,575 63 97 73 92 103 131 Marine Systems 2,906 3,063 3,030 123 92 166 109 105 106 Corporate* 3,291 2,987 3,712 26 7 41 7 6 7 Total $ 35,046 $ 33,172 $ 32,538 $ 428 $ 392 $ 569 $ 441 $ 453 $ 481 * Corporate identifiable assets are primarily cash and equivalents. See Note B for additional revenue information by business group. The following table presents our revenue by geographic area based on the location of our customers: Year Ended December 31 2017 2016 2015 North America: United States $ 23,519 $ 23,160 $ 23,480 Other 915 709 1,121 Total North America 24,434 23,869 24,601 Europe 2,558 2,152 2,760 Asia/Pacific 2,011 1,650 1,589 Africa/Middle East 1,655 2,617 2,426 South America 315 273 405 Total revenue $ 30,973 $ 30,561 $ 31,781 Our revenue from non-U.S. operations was $3.7 billion in 2017 , 2016 and 2015 , and earnings from continuing operations before income taxes from non-U.S. operations were $550 in 2017 , $530 in 2016 and $546 in 2015 . The long-lived assets associated with these operations were 5% of our total long-lived assets on December 31, 2017 , 2016 and 2015.

Condensed Consolidating Financi

Condensed Consolidating Financial Statements	12 Months Ended
	Dec. 31, 2017
Consolidating Financial Statements [Abstract]
Condensed Consolidating Financial Statements	CONDENSED CONSOLIDATING FINANCIAL STATEMENTS The fixed-rate notes described in Note K are fully and unconditionally guaranteed on an unsecured, joint and several basis by several of our 100 %-owned subsidiaries (the guarantors). The following condensed consolidating financial statements illustrate the composition of the parent, the guarantors on a combined basis (each guarantor together with its majority-owned subsidiaries) and all other subsidiaries on a combined basis. CONDENSED CONSOLIDATING STATEMENTS OF EARNINGS Year Ended December 31, 2017 Parent Guarantors on a Combined Basis Other Subsidiaries Consolidating Adjustments Total Consolidated Revenue $ — $ 26,933 $ 4,040 $ — $ 30,973 Cost of sales (6 ) 21,684 3,108 — 24,786 G&A 53 1,642 315 — 2,010 Operating earnings (47 ) 3,607 617 — 4,177 Interest, net (97 ) 1 (7 ) — (103 ) Other, net 3 — — — 3 Earnings before income tax (141 ) 3,608 610 — 4,077 Provision for income tax, net (154 ) 1,262 57 — 1,165 Equity in net earnings of subsidiaries 2,899 — — (2,899 ) — Net earnings $ 2,912 $ 2,346 $ 553 $ (2,899 ) $ 2,912 Comprehensive income $ 3,479 $ 2,336 $ 1,158 $ (3,494 ) $ 3,479 Year Ended December 31, 2016 Revenue $ — $ 26,573 $ 3,988 $ — $ 30,561 Cost of sales — 21,785 3,102 — 24,887 G&A 39 1,585 316 — 1,940 Operating earnings (39 ) 3,203 570 — 3,734 Interest, net (91 ) (2 ) 2 — (91 ) Other, net 12 (4 ) 5 — 13 Earnings before income tax (118 ) 3,197 577 — 3,656 Provision for income tax, net (121 ) 1,055 43 — 977 Discontinued operations, net of tax (107 ) — — — (107 ) Equity in net earnings of subsidiaries 2,676 — — (2,676 ) — Net earnings $ 2,572 $ 2,142 $ 534 $ (2,676 ) $ 2,572 Comprehensive income $ 2,468 $ 2,112 $ 543 $ (2,655 ) $ 2,468 Year Ended December 31, 2015 Revenue $ — $ 27,730 $ 4,051 $ — $ 31,781 Cost of sales (6 ) 22,385 3,154 — 25,533 G&A 46 1,610 297 — 1,953 Operating earnings (40 ) 3,735 600 — 4,295 Interest, net (89 ) (1 ) 7 — (83 ) Other, net 4 2 1 — 7 Earnings before income tax (125 ) 3,736 608 — 4,219 Provision for income tax, net (151 ) 1,202 132 — 1,183 Equity in net earnings of subsidiaries 3,010 — — (3,010 ) — Net earnings $ 3,036 $ 2,534 $ 476 $ (3,010 ) $ 3,036 Comprehensive income $ 2,685 $ 2,745 $ (193 ) $ (2,552 ) $ 2,685 CONDENSED CONSOLIDATING BALANCE SHEET December 31, 2017 Parent Guarantors on a Combined Basis Other Subsidiaries on a Combined Basis Consolidating Adjustments Total Consolidated ASSETS Current assets: Cash and equivalents $ 1,930 $ — $ 1,053 $ — $ 2,983 Accounts receivable — 1,259 2,358 — 3,617 Unbilled receivables — 2,547 2,693 — 5,240 Inventories — 5,216 87 — 5,303 Other current assets 351 461 373 — 1,185 Total current assets 2,281 9,483 6,564 — 18,328 Noncurrent assets: PP&E 221 6,779 1,237 — 8,237 Accumulated depreciation of PP&E (75 ) (3,869 ) (776 ) — (4,720 ) Intangible assets, net — 287 415 — 702 Goodwill — 8,320 3,594 — 11,914 Other assets 199 232 154 — 585 Investment in subsidiaries 44,887 — — (44,887 ) — Total noncurrent assets 45,232 11,749 4,624 (44,887 ) 16,718 Total assets $ 47,513 $ 21,232 $ 11,188 $ (44,887 ) $ 35,046 LIABILITIES AND SHAREHOLDERS’ EQUITY Current liabilities: Short-term debt and current portion of long-term debt $ — $ 1 $ 1 $ — $ 2 Customer advances and deposits — 4,180 2,812 — 6,992 Other current liabilities 561 3,758 1,786 — 6,105 Total current liabilities 561 7,939 4,599 — 13,099 Noncurrent liabilities: Long-term debt 3,950 21 9 — 3,980 Other liabilities 2,451 3,473 608 — 6,532 Total noncurrent liabilities 6,401 3,494 617 — 10,512 Intercompany 29,116 (28,494 ) (622 ) — — Shareholders’ equity: Common stock 482 6 2,126 (2,132 ) 482 Other shareholders’ equity 10,953 38,287 4,468 (42,755 ) 10,953 Total shareholders’ equity 11,435 38,293 6,594 (44,887 ) 11,435 Total liabilities and shareholders’ equity $ 47,513 $ 21,232 $ 11,188 $ (44,887 ) $ 35,046 CONDENSED CONSOLIDATING BALANCE SHEET December 31, 2016 Parent Guarantors on a Combined Basis Other Subsidiaries on a Combined Basis Consolidating Adjustments Total Consolidated ASSETS Current assets: Cash and equivalents $ 1,254 $ — $ 1,080 $ — $ 2,334 Accounts receivable — 1,155 2,244 — 3,399 Unbilled receivables — 2,235 1,977 — 4,212 Inventories — 5,022 96 — 5,118 Other current assets 634 599 238 — 1,471 Total current assets 1,888 9,011 5,635 — 16,534 Noncurrent assets: PP&E 197 6,586 1,146 — 7,929 Accumulated depreciation of PP&E (67 ) (3,653 ) (732 ) — (4,452 ) Intangible assets, net — 265 413 — 678 Goodwill — 8,050 3,395 — 11,445 Other assets 640 232 166 — 1,038 Investment in subsidiaries 41,956 — — (41,956 ) — Total noncurrent assets 42,726 11,480 4,388 (41,956 ) 16,638 Total assets $ 44,614 $ 20,491 $ 10,023 $ (41,956 ) $ 33,172 LIABILITIES AND SHAREHOLDERS’ EQUITY Current liabilities: Short-term debt and current portion of long-term debt $ 898 $ 2 $ — $ — $ 900 Customer advances and deposits — 4,339 2,488 — 6,827 Other current liabilities 564 3,465 1,694 — 5,723 Total current liabilities 1,462 7,806 4,182 — 13,450 Noncurrent liabilities: Long-term debt 2,966 22 — — 2,988 Other liabilities 3,520 2,330 583 — 6,433 Total noncurrent liabilities 6,486 2,352 583 — 9,421 Intercompany 26,365 (25,827 ) (538 ) — — Shareholders’ equity: Common stock 482 6 2,354 (2,360 ) 482 Other shareholders’ equity 9,819 36,154 3,442 (39,596 ) 9,819 Total shareholders’ equity 10,301 36,160 5,796 (41,956 ) 10,301 Total liabilities and shareholders’ equity $ 44,614 $ 20,491 $ 10,023 $ (41,956 ) $ 33,172 CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS Year Ended December 31, 2015 Parent Guarantors on a Combined Basis Other Subsidiaries on a Combined Basis Consolidating Adjustments Total Consolidated Net cash provided by operating activities* $ 50 $ 2,202 $ 355 $ — $ 2,607 Cash flows from investing activities: Capital expenditures (42 ) (475 ) (52 ) — (569 ) Maturities of held-to-maturity securities 500 — — — 500 Other, net 166 103 — — 269 Net cash provided by investing activities 624 (372 ) (52 ) — 200 Cash flows from financing activities: Purchases of common stock (3,233 ) — — — (3,233 ) Dividends paid (873 ) — — — (873 ) Repayment of fixed-rate notes (500 ) — — — (500 ) Other, net 237 2 — — 239 Net cash used by financing activities (4,369 ) 2 — — (4,367 ) Net cash used by discontinued operations (43 ) — — — (43 ) Cash sweep/funding by parent 2,934 (1,832 ) (1,102 ) — — Net decrease in cash and equivalents (804 ) — (799 ) — (1,603 ) Cash and equivalents at beginning of year 2,536 — 1,852 — 4,388 Cash and equivalents at end of year $ 1,732 $ — $ 1,053 $ — $ 2,785 * Continuing operations only. CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS Year Ended December 31, 2017 Parent Guarantors on a Combined Basis Other Subsidiaries on a Combined Basis Consolidating Adjustments Total Consolidated Net cash provided by operating activities* $ 316 $ 2,370 $ 1,193 $ — $ 3,879 Cash flows from investing activities: Capital expenditures (26 ) (330 ) (72 ) — (428 ) Business acquisitions, net of cash acquired — (350 ) (49 ) — (399 ) Other, net 6 32 (2 ) — 36 Net cash used by investing activities (20 ) (648 ) (123 ) — (791 ) Cash flows from financing activities: Purchases of common stock (1,558 ) — — — (1,558 ) Dividends paid (986 ) — — — (986 ) Proceeds from fixed-rate notes 985 — — — 985 Repayment of fixed-rate notes (900 ) — — — (900 ) Other, net 63 (3 ) — — 60 Net cash used by financing activities (2,396 ) (3 ) — — (2,399 ) Net cash used by discontinued operations (40 ) — — — (40 ) Cash sweep/funding by parent 2,816 (1,719 ) (1,097 ) — — Net increase in cash and equivalents 676 — (27 ) — 649 Cash and equivalents at beginning of year 1,254 — 1,080 — 2,334 Cash and equivalents at end of year $ 1,930 $ — $ 1,053 $ — $ 2,983 Year Ended December 31, 2016 Net cash provided by operating activities* $ 219 $ 1,914 $ 65 $ — $ 2,198 Cash flows from investing activities: Capital expenditures (8 ) (336 ) (48 ) — (392 ) Other, net 5 (1 ) (38 ) — (34 ) Net cash used by investing activities (3 ) (337 ) (86 ) — (426 ) Cash flows from financing activities: Purchases of common stock (1,996 ) — — — (1,996 ) Proceeds from fixed-rate notes 992 — — — 992 Dividends paid (911 ) — — — (911 ) Repayment of fixed-rate notes (500 ) — — — (500 ) Proceeds from stock option exercises 292 — — — 292 Other, net (45 ) (1 ) — — (46 ) Net cash used by financing activities (2,168 ) (1 ) — — (2,169 ) Net cash used by discontinued operations (54 ) — — — (54 ) Cash sweep/funding by parent 1,528 (1,576 ) 48 — — Net decrease in cash and equivalents (478 ) — 27 — (451 ) Cash and equivalents at beginning of year 1,732 — 1,053 — 2,785 Cash and equivalents at end of year $ 1,254 $ — $ 1,080 $ — $ 2,334 * Continuing operations only.

Prior-Period Financial Statemen

Prior-Period Financial Statements	12 Months Ended
	Dec. 31, 2017
Accounting Changes and Error Corrections [Abstract]
Prior-Period Financial Statements	PERIOD FINANCIAL STATEMENTS Our prior-period financial statements were restated for the adoption of two ASUs that are discussed below. ASC Topic 606. We adopted ASC Topic 606 on January 1, 2017, using the retrospective method. The adoption of ASC Topic 606 had two primary impacts on our Consolidated Financial Statements. The impact of adjustments on profit recorded to date is now recognized in the period identified (cumulative catch-up method), rather than prospectively over the remaining contract term. For our contracts for the manufacture of business-jet aircraft, we now recognize revenue at a single point in time when control is transferred to the customer, generally upon delivery and acceptance of the fully outfitted aircraft. Prior to the adoption of ASC Topic 606, we recognized revenue for these contracts at two contractual milestones: when green aircraft were completed and accepted by the customer and when the customer accepted final delivery of the fully outfitted aircraft. The cumulative effect of the adoption was recognized as a decrease to retained earnings of $372 on January 1, 2015. We applied the standard’s practical expedient that permits the omission of prior-period information about our remaining performance obligations. No other practical expedients were applied. ASU 2015-17, Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes. We adopted ASU 2015-17 on January 1, 2017, using the retrospective method. ASU 2015-17 requires that deferred tax assets and liabilities be classified as noncurrent on the Consolidated Balance Sheet. The adoption of ASU 2015-17 resulted in reclassifications among accounts on the Consolidated Balance Sheet, but had no other impacts on our results of operations, financial condition or cash flows. The following tables summarize the effects of adopting these accounting standards on our Consolidated Financial Statements. CONSOLIDATED STATEMENT OF EARNINGS Year Ended Effect of the Adoption of Year Ended December 31, 2016 ASC ASU December 31, 2016 (Dollars in millions, except per-share amounts) As Reported Topic 606 2015-17 As Adjusted Revenue: Products $ 19,885 $ (875 ) $ — $ 19,010 Services 11,468 83 — 11,551 31,353 (792 ) — 30,561 Operating costs and expenses: Products 15,458 (299 ) — 15,159 Services 9,663 83 — 9,746 G&A 1,923 (1 ) — 1,922 27,044 (217 ) — 26,827 Operating earnings 4,309 (575 ) — 3,734 Interest, net (91 ) — — (91 ) Other, net 13 — — 13 Earnings from continuing operations before income tax 4,231 (575 ) — 3,656 Provision for income tax, net 1,169 (192 ) — 977 Earnings from continuing operations 3,062 (383 ) — 2,679 Discontinued operations, net of tax benefit of $51 (107 ) — — (107 ) Net earnings $ 2,955 $ (383 ) $ — $ 2,572 Earnings per share Basic: Continuing operations $ 10.05 $ (1.26 ) $ — $ 8.79 Discontinued operations (0.35 ) — — (0.35 ) Net earnings $ 9.70 $ (1.26 ) $ — $ 8.44 Diluted: Continuing operations $ 9.87 $ (1.23 ) $ — $ 8.64 Discontinued operations (0.35 ) — — (0.35 ) Net earnings $ 9.52 $ (1.23 ) $ — $ 8.29 CONSOLIDATED STATEMENT OF EARNINGS Year Ended Effect of the Adoption of Year Ended December 31, 2015 ASC ASU December 31, 2015 (Dollars in millions, except per-share amounts) As Reported Topic 606 2015-17 As Adjusted Revenue: Products $ 20,280 $ 197 $ — $ 20,477 Services 11,189 115 — 11,304 31,469 312 — 31,781 Operating costs and expenses: Products 15,883 103 — 15,986 Services 9,471 92 — 9,563 G&A 1,937 — — 1,937 27,291 195 — 27,486 Operating earnings 4,178 117 — 4,295 Interest, net (83 ) — — (83 ) Other, net 7 — — 7 Earnings from continuing operations before income tax 4,102 117 — 4,219 Provision for income tax, net 1,137 46 — 1,183 Earnings from continuing operations 2,965 71 — 3,036 Discontinued operations, net of tax benefit of $7 — — — — Net earnings $ 2,965 $ 71 $ — $ 3,036 Earnings per share Basic: Continuing operations $ 9.23 $ 0.22 $ — $ 9.45 Discontinued operations — — — — Net earnings $ 9.23 $ 0.22 $ — $ 9.45 Diluted: Continuing operations $ 9.08 $ 0.21 $ — $ 9.29 Discontinued operations — — — — Net earnings $ 9.08 $ 0.21 $ — $ 9.29 CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Year Ended Effect of the Adoption of Year Ended December 31, 2016 ASC ASU December 31, 2016 (Dollars in millions) As Reported Topic 606 2015-17 As Adjusted Net earnings $ 2,955 $ (383 ) $ — $ 2,572 Gains on cash flow hedges 191 — — 191 Unrealized losses on securities (9 ) — — (9 ) Foreign currency translation adjustments (118 ) 6 — (112 ) Change in retirement plans’ funded status (192 ) — — (192 ) Other comprehensive loss, pretax (128 ) 6 — (122 ) Benefit for income tax, net (18 ) — — (18 ) Other comprehensive loss, net of tax (110 ) 6 — (104 ) Comprehensive income $ 2,845 $ (377 ) $ — $ 2,468 Year Ended Effect of the Adoption of Year Ended December 31, 2015 ASC ASU December 31, 2015 (Dollars in millions) As Reported Topic 606 2015-17 As Adjusted Net earnings $ 2,965 $ 71 $ — $ 3,036 Losses on cash flow hedges (394 ) — — (394 ) Unrealized losses on securities (2 ) — — (2 ) Foreign currency translation adjustments (374 ) 3 — (371 ) Change in retirement plans’ funded status 500 — — 500 Other comprehensive loss, pretax (270 ) 3 — (267 ) Provision for income tax, net 84 — — 84 Other comprehensive loss, net of tax (354 ) 3 — (351 ) Comprehensive income $ 2,611 $ 74 $ — $ 2,685 CONSOLIDATED BALANCE SHEET Effect of the Adoption of December 31, 2016 ASC ASU December 31, 2016 (Dollars in millions) As Reported Topic 606 2015-17* As Adjusted ASSETS Current assets: Cash and equivalents $ 2,334 $ — $ — $ 2,334 Accounts receivable 3,611 (212 ) — 3,399 Unbilled receivables 5,282 (1,070 ) — 4,212 Inventories 3,523 1,595 — 5,118 Other current assets 697 789 (15 ) 1,471 Total current assets 15,447 1,102 (15 ) 16,534 Noncurrent assets: PP&E, net 3,467 10 — 3,477 Intangible assets, net 678 — — 678 Goodwill 11,445 — — 11,445 Other assets 1,835 — (797 ) 1,038 Total noncurrent assets 17,425 10 (797 ) 16,638 Total assets $ 32,872 $ 1,112 $ (812 ) $ 33,172 LIABILITIES AND SHAREHOLDERS’ EQUITY Current liabilities: Short-term debt and current portion of long-term debt $ 900 $ — $ — $ 900 Accounts payable 2,538 — — 2,538 Customer advances and deposits 4,939 1,888 — 6,827 Other current liabilities 4,469 (361 ) (923 ) 3,185 Total current liabilities 12,846 1,527 (923 ) 13,450 Noncurrent liabilities: Long-term debt 2,988 — — 2,988 Other liabilities 6,062 260 111 6,433 Commitments and contingencies Total noncurrent liabilities 9,050 260 111 9,421 Shareholders’ equity: Common stock 482 — — 482 Surplus 2,819 — — 2,819 Retained earnings 25,227 (684 ) — 24,543 Treasury stock (14,156 ) — — (14,156 ) Accumulated other comprehensive loss (3,396 ) 9 — (3,387 ) Total shareholders’ equity 10,976 (675 ) — 10,301 Total liabilities and shareholders’ equity $ 32,872 $ 1,112 $ (812 ) $ 33,172 * The effect of the adoption of ASU 2015-17 includes the reclassification of current deferred tax assets and liabilities of $10 and $335 , respectively, which represents the impact to current deferred taxes of adopting ASC Topic 606. CONSOLIDATED STATEMENT OF CASH FLOWS Year Ended Effect of the Adoption of Year Ended December 31, 2016 ASC ASU December 31, 2016 (Dollars in millions) As Reported Topic 606 2015-17 As Adjusted Cash flows from operating activities - continuing operations: Net earnings $ 2,955 $ (383 ) $ — $ 2,572 Adjustments to reconcile net earnings to net cash provided by operating activities: Depreciation of PP&E 366 (1 ) — 365 Amortization of intangible assets 88 — — 88 Equity-based compensation expense 95 — — 95 Deferred income tax provision 376 (192 ) — 184 Discontinued operations, net of tax 107 — — 107 (Increase) decrease in assets, net of effects of business acquisitions: Accounts receivable (161 ) 39 — (122 ) Unbilled receivables (1,033 ) (15 ) — (1,048 ) Inventories (154 ) (223 ) — (377 ) Other current assets 55 260 — 315 Increase (decrease) in liabilities, net of effects of business acquisitions: Accounts payable 567 — — 567 Customer advances and deposits (825 ) 520 — (305 ) Other, net (238 ) (5 ) — (243 ) Net cash provided by operating activities 2,198 — — 2,198 Cash flows from investing activities: Capital expenditures (392 ) — — (392 ) Business acquisitions, net of cash acquired (58 ) — — (58 ) Proceeds from sales of assets 9 — — 9 Other, net 15 — — 15 Net cash used by investing activities (426 ) — — (426 ) Cash flows from financing activities: Purchases of common stock (1,996 ) — — (1,996 ) Proceeds from fixed-rate notes 992 — — 992 Dividends paid (911 ) — — (911 ) Repayment of fixed-rate notes (500 ) — — (500 ) Proceeds from stock option exercises 292 — — 292 Other, net (46 ) — — (46 ) Net cash used by financing activities (2,169 ) — — (2,169 ) Net cash used by discontinued operations (54 ) — — (54 ) Net decrease in cash and equivalents (451 ) — — (451 ) Cash and equivalents at beginning of year 2,785 — — 2,785 Cash and equivalents at end of year $ 2,334 $ — $ — $ 2,334 CONSOLIDATED STATEMENT OF CASH FLOWS Year Ended Effect of the Adoption of Year Ended December 31, 2015 ASC ASU December 31, 2015 (Dollars in millions) As Reported Topic 606 2015-17 As Adjusted Cash flows from operating activities - continuing operations: Net earnings $ 2,965 $ 71 $ — $ 3,036 Adjustments to reconcile net earnings to net cash provided by operating activities: Depreciation of PP&E 366 (1 ) — 365 Amortization of intangible assets 116 — — 116 Equity-based compensation expense 98 — — 98 Deferred income tax provision 167 46 — 213 (Increase) decrease in assets, net of effects of business acquisitions: Accounts receivable 604 28 — 632 Unbilled receivables 231 (170 ) — 61 Inventories (156 ) 297 — 141 Other current assets (38 ) 118 — 80 Increase (decrease) in liabilities, net of effects of business acquisitions: Accounts payable (89 ) — — (89 ) Customer advances and deposits (1,756 ) (397 ) — (2,153 ) Other, net 99 8 — 107 Net cash provided by operating activities 2,607 — — 2,607 Cash flows from investing activities: Capital expenditures (569 ) — — (569 ) Maturities of held-to-maturity securities 500 — — 500 Proceeds from sales of assets 291 — — 291 Business acquisitions, net of cash acquired (5 ) — — (5 ) Other, net (17 ) — — (17 ) Net cash provided by investing activities 200 — — 200 Cash flows from financing activities: Purchases of common stock (3,233 ) — — (3,233 ) Dividends paid (873 ) — — (873 ) Repayment of fixed-rate notes (500 ) — — (500 ) Proceeds from stock option exercises 268 — — 268 Other, net (29 ) — — (29 ) Net cash used by financing activities (4,367 ) — — (4,367 ) Net cash used by discontinued operations (43 ) — — (43 ) Net decrease in cash and equivalents (1,603 ) — — (1,603 ) Cash and equivalents at beginning of year 4,388 — — 4,388 Cash and equivalents at end of year $ 2,785 $ — $ — $ 2,785 CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY Common Stock Retained Treasury Accumulated Other Comprehensive Total Shareholders’ (Dollars in millions) Par Surplus Earnings Stock Loss Equity December 31, 2014 - as reported $ 482 $ 2,548 $ 21,127 $ (9,396 ) $ (2,932 ) $ 11,829 Cumulative-effect adjustment of ASC Topic 606 on January 1, 2015 — — (372 ) — — (372 ) December 31, 2014 - as adjusted $ 482 $ 2,548 $ 20,755 $ (9,396 ) $ (2,932 ) $ 11,457 Year ended December 31, 2015 - as reported — 182 2,077 (2,996 ) (354 ) (1,091 ) Effect of the adoption of ASC Topic 606 — — 71 — 3 74 Effect of the adoption of ASU 2015-17 — — — — — — December 31, 2015 - as adjusted $ 482 $ 2,730 $ 22,903 $ (12,392 ) $ (3,283 ) $ 10,440 Year ended December 31, 2016 - as reported — 89 2,023 (1,764 ) (110 ) 238 Effect of the adoption of ASC Topic 606 — — (383 ) — 6 (377 ) Effect of the adoption of ASU 2015-17 — — — — — — December 31, 2016 - as adjusted $ 482 $ 2,819 $ 24,543 $ (14,156 ) $ (3,387 ) $ 10,301

Summary Of Significant Accoun28

Summary Of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Organization	Organization. General Dynamics is organized into four business groups: Aerospace, which delivers Gulfstream aircraft and provides services for Gulfstream aircraft and aircraft produced by other original equipment manufacturers (OEMs); Combat Systems, which designs and manufactures combat vehicles, weapons systems and munitions; Information Systems and Technology, which provides C4ISR (command, control, communication, computers, intelligence, surveillance and reconnaissance) solutions and information technology (IT) services; and Marine Systems, which designs, constructs and repairs surface ships and submarines. Our primary customer is the U.S. government. We also do significant business with non-U.S. governments and a diverse base of corporate and individual buyers of business aircraft.
Basis of Consolidation and Classification	Basis of Consolidation and Classification. The Consolidated Financial Statements include the accounts of General Dynamics Corporation and our wholly owned and majority-owned subsidiaries. We eliminate all inter-company balances and transactions in the Consolidated Financial Statements. Some prior-year amounts have been reclassified among financial statement accounts or disclosures to conform to the current-year presentation. Consistent with industry practice, we classify assets and liabilities related to long-term contracts as current, even though some of these amounts may not be realized within one year. Further discussion of our significant accounting policies is contained in the other notes to these financial statements.
Use of Estimates	Use of Estimates. The nature of our business requires that we make estimates and assumptions in accordance with U.S. generally accepted accounting principles (GAAP). These estimates and assumptions affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements, as well as the reported amounts of revenue and expenses during the reporting period . We base our estimates on historical experience, currently available information and various other assumptions that we believe are reasonable under the circumstances . Actual results could differ from these estimates.
Discontinued Operations	Discontinued Operations, Net of Tax. In 2013, we settled litigation with the U.S. Navy related to the terminated A-12 aircraft contract in the company’s former tactical military aircraft business. In connection with the settlement, we released some rights to reimbursement of costs on ships under contract at our Bath, Maine, shipyard. As we progressed through the shipbuilding process, we determined that the cost associated with this settlement was greater than anticipated. Therefore, in 2016, we recognized an $84 loss, net of tax, to adjust the previously-recognized settlement value. In addition, we recognized a $10 loss, net of tax, in 2016 related to an environmental matter associated with a former operation of the company. In 2015, we completed the sale of our axle business in the Combat Systems group. In 2016, we recognized a final adjustment of $13 to the loss on the sale of this business.
Research and Development Expenses	Research and Development Expenses. Company-sponsored research and development (R&D) expenses, including product development costs, were $521 in 2017 , $418 in 2016 and $395 in 2015 . The increase in 2017 is due primarily to higher R&D expenses in the Aerospace group associated with ongoing product-development efforts as the group progresses with the certification of its two newest aircraft models, the G500 and G600. R&D expenses are included in operating costs and expenses in the Consolidated Statement of Earnings in the period in which they are incurred. Customer-sponsored R&D expenses are charged directly to the related contracts. The Aerospace group has cost-sharing arrangements with some of its suppliers that enhance the group’s internal development capabilities and offset a portion of the financial cost associated with the group’s product development efforts. These arrangements explicitly state that supplier contributions are for reimbursements of costs we incur in the development of new aircraft models and technologies, and we retain substantial rights in the products developed under these arrangements. We record amounts received from these cost-sharing arrangements as a reduction of R&D expenses. We have no obligation to refund any amounts received under the agreements regardless of the outcome of the development efforts. Under the typical terms of an agreement, payments received from suppliers for their share of the costs are based on milestones and are recognized as received. Our policy is to defer payments in excess of the costs we have incurred.
Interest, Net	Interest, Net. Net interest expense consisted of the following: Year Ended December 31 2017 2016 2015 Interest expense $ 117 $ 99 $ 98 Interest income (14 ) (8 ) (15 ) Interest expense, net $ 103 $ 91 $ 83
Cash And Equivalents And Investments In Debt And Equity Securities	Cash and Equivalents and Investments in Debt and Equity Securities. We consider securities with a maturity of three months or less to be cash equivalents. Our cash balances are invested primarily in time deposits rated A-/A3 or higher. Our investments in other securities are included in other current and noncurrent assets on the Consolidated Balance Sheet (see Note E). We report our held-to-maturity securities at amortized cost. We report our available-for-sale securities at fair value. Changes in the fair value of available-for-sale securities are recognized as a component of other comprehensive income (loss) in the Consolidated Statement of Comprehensive Income. We had no trading securities on December 31, 2017 or 2016 . Cash flows in 2016 and 2015 were affected negatively by growth in operating working capital in our Combat Systems group due to the utilization of deposits and the timing of billings on a large contract for a Middle Eastern customer, and in our Aerospace group from the build-up of inventory related to the new G500 and G600 aircraft programs and the liquidation of customer deposits associated with aircraft deliveries. In 2017, the growth in operating working capital due to these factors slowed and was offset by lower income tax payments.
Other Contract Costs	Other Contract Costs. Other contract costs represent amounts that are not currently allocable to government contracts, such as a portion of our estimated workers’ compensation obligations, other insurance-related assessments, pension and other post-retirement benefits, and environmental expenses. These costs will become allocable to contracts generally after they are paid. We expect to recover these costs through ongoing business, including existing backlog and probable follow-on contracts. If the backlog in the future does not support the continued deferral of these costs, the profitability of our remaining contracts could be adversely affected.
Long-lived Assets and Goodwill	Long-lived Assets and Goodwill. We review long-lived assets, including intangible assets subject to amortization, for impairment whenever events or changes in circumstances indicate that the carrying value of the asset may not be recoverable. We assess the recoverability of the carrying value of assets held for use based on a review of undiscounted projected cash flows. Impairment losses, where identified, are measured as the excess of the carrying value of the long-lived asset over its estimated fair value as determined by discounted projected cash flows. We review goodwill for impairment annually or when circumstances indicate that an impairment is more likely than not. Goodwill represents the purchase price paid in excess of the fair value of net tangible and intangible assets acquired. The test for goodwill impairment is a two-step process to first identify potential goodwill impairment for each reporting unit and then, if necessary, measure the amount of the impairment loss. Our reporting units are consistent with our business groups in Note R. We completed the required annual goodwill impairment test as of December 31, 2017 . The first step of the goodwill impairment test compares the fair value of each of our reporting units to its carrying value. We estimate the fair value of our reporting units based primarily on the discounted projected cash flows of the underlying operations. The estimated fair value of each of our reporting units was well in excess of its respective carrying value as of December 31, 2017 .
Accounting Standards Updates	Accounting Standards Updates. On January 1, 2017, we retrospectively adopted the following accounting standards issued by the Financial Accounting Standards Board (FASB) that impacted our prior-period financial statements: • ASC Topic 606, Revenue from Contracts with Customers • ASU 2015-17, Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes See Note T for further discussion of each of these accounting standards. We also adopted ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory, on January 1, 2017. We recognized the cumulative effect of this standard as a $3 decrease to retained earnings on the date of adoption. ASU 2016-16 requires recognition of the current and deferred income tax effects of an intra-entity asset transfer, other than inventory, when the transfer occurs, as opposed to former GAAP, which required companies to defer the income tax effects of intra-entity asset transfers until the asset was sold to an outside party. The income tax effects of intra-entity inventory transfers will continue to be deferred until the inventory is sold. There are several new accounting standards that have been issued by the FASB but are not effective until after December 31, 2017, including the following: • ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. ASU 2016-01 addresses certain aspects of recognition, measurement, presentation and disclosure of financial instruments. Specific to our business, ASU 2016-01 requires equity investments to be measured at fair value with changes in fair value recognized in net income. The ASU eliminates the available-for-sale classification for equity investments that recognized changes in fair value as a component of other comprehensive income. We adopted the standard on a modified retrospective basis with a cumulative-effect adjustment to the Consolidated Balance Sheet on January 1, 2018. The adoption of the ASU did not have a material effect on our results of operations, financial condition or cash flows. • ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. ASU 2016-15 is intended to reduce diversity in practice in how certain cash receipts and cash payments are presented and classified in the Consolidated Statement of Cash Flows by providing guidance on eight specific cash flow issues. We adopted the standard retrospectively on January 1, 2018. The adoption of the ASU did not have a material effect on our cash flows. • ASU 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. ASU 2017-07 requires the service cost component of net benefit cost to be reported separately from the other components of net benefit cost in the income statement. The ASU also allows only the service cost component of net benefit cost to be eligible for capitalization. We adopted the standard retrospectively on January 1, 2018. Our reported 2017 operating earnings, when restated, will increase $59 due to the reclassification of the non-service cost components of net benefit cost, and our reported other income will decrease by the same amount, with no impact to net earnings. The area of the ASU related to capitalization did not have a material effect on our results of operations, financial condition or cash flows. • ASU 2016-02, Leases (Topic 842). ASU 2016-02 requires the recognition of lease rights and obligations as assets and liabilities on the balance sheet. Previously, lessees were not required to recognize on the balance sheet assets and liabilities arising from operating leases. The ASU also requires disclosure of key information about leasing arrangements. ASU 2016-02 is effective on January 1, 2019, using a modified retrospective method of adoption as of January 1, 2017. In January 2018, the FASB issued an exposure draft of the proposed ASU, Leases (Topic 842): Targeted Improvements. The proposed ASU provides an alternative transition method of adoption, permitting the recognition of a cumulative-effect adjustment to retained earnings on the date of adoption. We intend to adopt the standard on the effective date, but have not yet selected a transition method. We are currently evaluating our population of leased assets in order to assess the impact of the ASU on our lease portfolio, and designing and implementing new processes and controls. Until this effort is completed, we cannot determine the effect of the ASU on our results of operations, financial condition or cash flows. • ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. ASU 2017-12 is intended to simplify hedge accounting by better aligning an entity’s financial reporting for hedging relationships with its risk management activities. The ASU also simplifies the application of the hedge accounting guidance. ASU 2017-12 is effective on January 1, 2019, with early adoption permitted. For cash flow hedges existing at the adoption date, the standard requires adoption on a modified retrospective basis with a cumulative-effect adjustment to the Consolidated Balance Sheet as of the beginning of the year of adoption. The amendments to presentation guidance and disclosure requirements are required to be adopted prospectively. We have not yet determined the effect of the ASU on our results of operations, financial condition or cash flows, nor have we selected a transition date.
Revenue Recognition	Each of these contract types presents advantages and disadvantages. Typically, we assume more risk with fixed-price contracts. However, these types of contracts offer additional profits when we complete the work for less than originally estimated. Cost-reimbursement contracts generally subject us to lower risk. Accordingly, the associated base fees are usually lower than fees earned on fixed-price contracts. Under time-and-materials contracts, our profit may vary if actual labor-hour rates vary significantly from the negotiated rates. Also, because these contracts can provide little or no fee for managing material costs, the content mix can impact profitability. Contract Balances. The timing of revenue recognition, billings and cash collections results in billed accounts receivable, unbilled receivables (contract assets), and customer advances and deposits (contract liabilities) on the Consolidated Balance Sheet. In our defense groups, amounts are billed as work progresses in accordance with agreed-upon contractual terms, either at periodic intervals (e.g., biweekly or monthly) or upon achievement of contractual milestones. Generally, billing occurs subsequent to revenue recognition, resulting in contract assets. However, we sometimes receive advances or deposits from our customers, particularly on our international contracts, before revenue is recognized, resulting in contract liabilities. These assets and liabilities are reported on the Consolidated Balance Sheet on a contract-by-contract basis at the end of each reporting period. In our Aerospace group, we generally receive deposits from customers upon contract execution and upon achievement of contractual milestones. These deposits are liquidated when revenue is recognized. The majority of our revenue is derived from long-term contracts and programs that can span several years. We account for revenue in accordance with ASC Topic 606. Performance Obligations. A performance obligation is a promise in a contract to transfer a distinct good or service to the customer, and is the unit of account in ASC Topic 606. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. The majority of our contracts have a single performance obligation as the promise to transfer the individual goods or services is not separately identifiable from other promises in the contracts and is, therefore, not distinct. Some of our contracts have multiple performance obligations, most commonly due to the contract covering multiple phases of the product lifecycle (development, production, maintenance and support). For contracts with multiple performance obligations, we allocate the contract’s transaction price to each performance obligation using our best estimate of the standalone selling price of each distinct good or service in the contract. The primary method used to estimate standalone selling price is the expected cost plus a margin approach, under which we forecast our expected costs of satisfying a performance obligation and then add an appropriate margin for that distinct good or service. Contract modifications are routine in the performance of our contracts. Contracts are often modified to account for changes in contract specifications or requirements. In most instances, contract modifications are for goods or services that are not distinct, and, therefore, are accounted for as part of the existing contract. Our performance obligations are satisfied over time as work progresses or at a point in time. Revenue from products and services transferred to customers over time accounted for 71% of our revenue in 2017 , 72% in 2016 and 68% in 2015 . Substantially all of our revenue in the defense groups is recognized over time, because control is transferred continuously to our customers. Typically, revenue is recognized over time using costs incurred to date relative to total estimated costs at completion to measure progress toward satisfying our performance obligations. Incurred cost represents work performed, which corresponds with, and thereby best depicts, the transfer of control to the customer. Contract costs include labor, material, overhead and, when appropriate, G&A expenses. Revenue from goods and services transferred to customers at a point in time accounted for 29% of our revenue in 2017 , 28% in 2016 and 32% in 2015 . The majority of our revenue recognized at a point in time is for the manufacture of business-jet aircraft in our Aerospace group. Revenue on these contracts is recognized when the customer obtains control of the asset, which is generally upon delivery and acceptance by the customer of the fully outfitted aircraft . On December 31, 2017, we had $63.2 billion of remaining performance obligations, which we also refer to as total backlog. We expect to recognize approximately 40% of our remaining performance obligations as revenue in 2018, an additional 40% by 2020 and the balance thereafter. Contract Estimates. Accounting for long-term contracts and programs involves the use of various techniques to estimate total contract revenue and costs. For long-term contracts, we estimate the profit on a contract as the difference between the total estimated revenue and expected costs to complete a contract and recognize that profit over the life of the contract. Contract estimates are based on various assumptions to project the outcome of future events that often span several years. These assumptions include labor productivity and availability; the complexity of the work to be performed; the cost and availability of materials; the performance of subcontractors; and the availability and timing of funding from the customer. The nature of our contracts gives rise to several types of variable consideration, including claims and award and incentive fees. We include in our contract estimates additional revenue for submitted contract modifications or claims against the customer when we believe we have an enforceable right to the modification or claim, the amount can be estimated reliably and its realization is probable. In evaluating these criteria, we consider the contractual/legal basis for the claim, the cause of any additional costs incurred, the reasonableness of those costs and the objective evidence available to support the claim. We include award or incentive fees in the estimated transaction price when there is a basis to reasonably estimate the amount of the fee. These estimates are based on historical award experience, anticipated performance and our best judgment at the time. Because of our certainty in estimating these amounts, they are included in the transaction price of our contracts and the associated remaining performance obligations. As a significant change in one or more of these estimates could affect the profitability of our contracts, we review and update our contract-related estimates regularly. We recognize adjustments in estimated profit on contracts under the cumulative catch-up method. Under this method, the impact of the adjustment on profit recorded to date on a contract is recognized in the period the adjustment is identified. Revenue and profit in future periods of contract performance are recognized using the adjusted estimate. If at any time the estimate of contract profitability indicates an anticipated loss on the contract, we recognize the total loss in the period it is identified.
Earnings Per Share	We compute basic earnings per share (EPS) using net earnings for the period and the weighted average number of common shares outstanding during the period.
Fair Value of Financial Instruments	Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in the principal or most advantageous market in an orderly transaction between marketplace participants. Various valuation approaches can be used to determine fair value, each requiring different valuation inputs. The following hierarchy classifies the inputs used to determine fair value into three levels: • Level 1 - quoted prices in active markets for identical assets or liabilities; • Level 2 - inputs, other than quoted prices, observable by a marketplace participant either directly or indirectly; and • Level 3 - unobservable inputs significant to the fair value measurement.
Tax Uncertainties	Tax Uncertainties. For all periods open to examination by tax authorities, we periodically assess our liabilities and contingencies based on the latest available information. Where we believe there is more than a 50% chance that our tax position will not be sustained, we record our best estimate of the resulting tax liability, including interest, in the Consolidated Financial Statements. We include any interest or penalties incurred in connection with income taxes as part of income tax expense. The total amount of these tax liabilities on December 31, 2017 , was not material to our results of operations, financial condition or cash flows. We participate in the IRS Compliance Assurance Process (CAP), a real-time audit of our consolidated federal corporate income tax return. The IRS has examined our consolidated federal income tax returns through 2016. We do not expect the resolution of tax matters for open years to have a material impact on our results of operations, financial condition, cash flows or effective tax rate. Based on all known facts and circumstances and current tax law, we believe the total amount of any unrecognized tax benefits on December 31, 2017 , was not material to our results of operations, financial condition or cash flows, and if recognized, would not have a material impact on our effective tax rate. In addition, there are no tax positions for which it is reasonably possible that the unrecognized tax benefits will vary significantly over the next 12 months, producing, individually or in the aggregate, a material effect on our results of operations, financial condition or cash flows.
Accounts and Unbilled Receivables	Accounts receivable represent amounts billed and currently due from customers. Payment is typically received from our customers either at periodic intervals (e.g., biweekly or monthly) or upon achievement of contractual milestones. Unbilled receivables represent revenue recognized on long-term contracts (contract costs and estimated profits) less associated advances and progress billings. These amounts will be billed in accordance with the agreed-upon contractual terms or upon achievement of contractual milestones.
Inventories	The majority of our inventories are for business-jet aircraft. Our inventories are stated at the lower of cost or net realizable value. Work in process represents largely labor, material and overhead costs associated with aircraft in the manufacturing process and is based primarily on the estimated average unit cost in a production lot. Raw materials are valued primarily on the first-in, first-out method. We record pre-owned aircraft acquired in connection with the sale of new aircraft at the lower of the trade-in value or the estimated net realizable value.
Derivatives Instruments and Hedging Activities	Foreign Currency Risk and Hedging Activities. Our foreign currency exchange rate risk relates to receipts from customers, payments to suppliers and inter-company transactions denominated in foreign currencies. To the extent possible, we include terms in our contracts that are designed to protect us from this risk. Otherwise, we enter into derivative financial instruments, principally foreign currency forward purchase and sale contracts, designed to offset and minimize our risk. The dollar-weighted three -year average maturity of these instruments generally matches the duration of the activities that are at risk. We record changes in the fair value of derivative financial instruments in operating costs and expenses in the Consolidated Statement of Earnings or in other comprehensive loss (OCL) within the Consolidated Statement of Comprehensive Income depending on whether the derivative is designated and qualifies for hedge accounting. Gains and losses related to derivative financial instruments that qualify as cash flow hedges are deferred in OCL until the underlying transaction is reflected in earnings. We adjust derivative financial instruments not designated as cash flow hedges to market value each period and record the gain or loss in the Consolidated Statement of Earnings. The gains and losses on these instruments generally offset losses and gains on the assets, liabilities and other transactions being hedged. Gains and losses resulting from hedge ineffectiveness are recognized in the Consolidated Statement of Earnings for all derivative financial instruments, regardless of designation. Net gains and losses on derivative financial instruments recognized in earnings, including gains and losses related to hedge ineffectiveness, were not material to our results of operations in any of the past three years. Net gains and losses reclassified to earnings from OCL were not material to our results of operations in any of the past three years, and we do not expect the amount of these gains and losses that will be reclassified to earnings in 2018 to be material. We are exposed to market risk, primarily from foreign currency exchange rates, interest rates, commodity prices and investments. We may use derivative financial instruments to hedge some of these risks as described below. Interest Rate Risk. Our financial instruments subject to interest rate risk include fixed-rate long-term debt obligations and variable-rate commercial paper. However, the risk associated with these instruments is not material. Commodity Price Risk. We are subject to rising labor and commodity price risk, primarily on long-term, fixed-price contracts. To the extent possible, we include terms in our contracts that are designed to protect us from these risks. Some of the protective terms included in our contracts are considered derivative financial instruments but are not accounted for separately, because they are clearly and closely related to the host contract. We have not entered into any material commodity hedging contracts but may do so as circumstances warrant. We do not believe that changes in labor or commodity prices will have a material impact on our results of operations or cash flows. Investment Risk. Our investment policy allows for purchases of fixed-income securities with an investment-grade rating and a maximum maturity of up to five years.
Foreign Currency and Financial Statement Translation	Foreign Currency Financial Statement Translation. We translate foreign currency balance sheets from our international businesses’ functional currency (generally the respective local currency) to U.S. dollars at end-of-period exchange rates, and statements of earnings at average exchange rates for each period. The resulting foreign currency translation adjustments are a component of OCL. We do not hedge the fluctuation in reported revenue and earnings resulting from the translation of these international operations’ results into U.S. dollars. The impact of translating our non-U.S. operations’ revenue into U.S. dollars was not material to our results of operations in any of the past three years. In addition, the effect of changes in foreign exchange rates on non-U.S. cash balances was not material in each of the past three years.
Commitments and Contingencies	Environmental We are subject to and affected by a variety of federal, state, local and foreign environmental laws and regulations. We are directly or indirectly involved in environmental investigations or remediation at some of our current and former facilities and third-party sites that we do not own but where we have been designated a Potentially Responsible Party (PRP) by the U.S. Environmental Protection Agency or a state environmental agency. Based on historical experience, we expect that a significant percentage of the total remediation and compliance costs associated with these facilities will continue to be allowable contract costs and, therefore, recoverable under U.S. government contracts. As required, we provide financial assurance for certain sites undergoing or subject to investigation or remediation. We accrue environmental costs when it is probable that a liability has been incurred and the amount can be reasonably estimated. Where applicable, we seek insurance recovery for costs related to environmental liabilities. We do not record insurance recoveries before collection is considered probable. Based on all known facts and analyses, we do not believe that our liability at any individual site, or in the aggregate, arising from such environmental conditions will be material to our results of operations, financial condition or cash flows. We also do not believe that the range of reasonably possible additional loss beyond what has been recorded would be material to our results of operations, financial condition or cash flows. Other Government Contracts. As a government contractor, we are subject to U.S. government audits and investigations relating to our operations, including claims for fines, penalties, and compensatory and treble damages. We believe the outcome of such ongoing government audits and investigations will not have a material impact on our results of operations, financial condition or cash flows. In the performance of our contracts, we routinely request contract modifications that require additional funding from the customer. Most often, these requests are due to customer-directed changes in the scope of work. While we are entitled to recovery of these costs under our contracts, the administrative process with our customer may be protracted. Based on the circumstances, we periodically file requests for equitable adjustment (REAs) that are sometimes converted into claims. In some cases, these requests are disputed by our customer. We believe our outstanding modifications, REAs and other claims will be resolved without material impact to our results of operations, financial condition or cash flows. Letters of Credit and Guarantees. In the ordinary course of business, we have entered into letters of credit, bank guarantees, surety bonds and other similar arrangements with financial institutions and insurance carriers In addition, from time to time and in the ordinary course of business, we contractually guarantee the payment or performance of our subsidiaries arising under certain contracts. Aircraft Trade-ins. In connection with orders for new aircraft in funded contract backlog, our Aerospace group has outstanding options with some customers to trade in aircraft as partial consideration in their new-aircraft transaction. These trade-in commitments are generally structured to establish the fair market value of the trade-in aircraft at a date generally 45 or fewer days preceding delivery of the new aircraft to the customer. At that time, the customer is required to either exercise the option or allow its expiration. Any excess of the pre-established trade-in price above the fair market value at the time the new aircraft is delivered is treated as a reduction of revenue in the new-aircraft sales transaction.
Product Warranties	Product Warranties. We provide warranties to our customers associated with certain product sales. We record estimated warranty costs in the period in which the related products are delivered. The warranty liability recorded at each balance sheet date is generally based on the number of months of warranty coverage remaining for the products delivered and the average historical monthly warranty payments. Warranty obligations incurred in connection with long-term production contracts are accounted for within the contract estimates at completion. Our other warranty obligations, primarily for business-jet aircraft, are included in other current and noncurrent liabilities on the Consolidated Balance Sheet.
Equity Compensation Plans	Stock Options. Stock options granted under our equity compensation plans are issued with an exercise price at the fair value of our common stock determined by the average of the high and low stock prices as listed on the New York Stock Exchange on the date of grant. Restricted Stock/RSUs. The fair value of restricted stock and RSUs equals the average of the high and low market prices of our common stock as listed on the New York Stock Exchange on the date of grant. Grants of restricted stock are awards of shares of common stock. Participation units represent obligations that have a value derived from or related to the value of our common stock. These include stock appreciation rights, phantom stock units and RSUs, and are payable in cash or common stock. Restricted stock and RSUs generally vest over a three -year restriction period after the grant date, during which recipients may not sell, transfer, pledge, assign or otherwise convey their restricted shares to another party. During this period, restricted stock recipients receive cash dividends on their restricted shares and are entitled to vote those shares, while RSU recipients receive dividend-equivalent units instead of cash dividends and are not entitled to vote their RSUs or dividend-equivalent units. We grant RSUs with a performance measure derived from a non-GAAP-based management metric, return on invested capital (ROIC). Depending on the company’s performance with respect to this metric, the number of RSUs earned may be less than, equal to or greater than the original number of RSUs awarded subject to a payout range. We generally recognize compensation expense related to restricted stock and RSUs on a straight-line basis over the vesting period We recognize compensation expense related to stock options on a straight-line basis over the vesting period of the awards, net of estimated forfeitures. Estimated forfeitures are based on our historical forfeiture experience. We estimate the fair value of stock options on the date of grant using the Black-Scholes option pricing model Equity-based Compensation Expense. Equity-based compensation expense is included in G&A expenses. Equity Compensation Overview. We have equity compensation plans for employees, as well as for non-employee members of our board of directors. The equity compensation plans seek to provide an effective means of attracting and retaining directors, officers and key employees, and to provide them with incentives to enhance our growth and profitability. Under the equity compensation plans, awards may be granted to officers, employees or non-employee directors in common stock, options to purchase common stock, restricted shares of common stock, participation units or any combination of these. Annually, we grant awards of stock options, restricted stock and RSUs to participants in our equity compensation plans in early March. Additionally, we may make limited ad hoc grants on a quarterly basis for new hires or promotions. We issue common stock under our equity compensation plans from treasury stock.
Retirement Plans	Plan Assets A committee of our board of directors is responsible for the strategic oversight of our defined-benefit retirement plan assets held in trust. Management develops investment policies and provides oversight of a third-party investment manager who reports to the committee on a regular basis. The outsourced third-party investment manager develops investment strategies and makes all day-to-day investment decisions related to defined-benefit retirement plan assets in accordance with our investment policy and target allocation percentages. Our investment policy endeavors to strike the appropriate balance among capital preservation, asset growth and current income. The objective of our investment policy is to generate future returns consistent with our assumed long-term rate of return used to determine our benefit obligations and net annual benefit cost. Target allocation percentages vary over time depending on the perceived risk and return potential of various asset classes and market conditions. Pension Benefits. We have seven noncontributory and five contributory trusteed, qualified defined-benefit pension plans covering eligible government business employees, and two noncontributory and four contributory plans covering eligible commercial business employees, including some employees of our international operations. The primary factors affecting the benefits earned by participants in our pension plans are employees’ years of service and compensation levels. Our primary government pension plans, which comprise the majority of our unfunded obligation, were closed to new salaried participants on January 1, 2007. Additionally, we made changes to these plans for certain participants effective in 2014 that limit or cease the benefits that accrue for future service. We made similar changes to our primary commercial pension plan in 2015. We also sponsor one funded and several unfunded non-qualified supplemental executive retirement plans, which provide participants with additional benefits, including excess benefits over limits imposed on qualified plans by federal tax law. Other Post-retirement Benefits. We maintain plans that provide post-retirement healthcare and life insurance coverage for certain employees and retirees. These benefits vary by employment status, age, service and salary level at retirement. The coverage provided and the extent to which the retirees share in the cost of the program vary throughout the company. The plans provide health and life insurance benefits only to those employees who retire directly from our service and not to those who terminate service prior to eligibility for retirement. Contributions and Benefit Payments It is our policy to fund our defined-benefit retirement plans in a manner that optimizes the tax deductibility and contract recovery of contributions considered within our capital deployment framework. Therefore, we may make discretionary contributions in addition to the required contributions determined in accordance with IRS regulations. We provide defined-contribution benefits to eligible employees, as well as some remaining defined-benefit pension and other post-retirement benefits. Substantially all of our plans use a December 31 measurement date consistent with our fiscal year. Retirement Plan Summary Information Defined-contribution Benefits. We provide eligible employees the opportunity to participate in defined-contribution savings plans (commonly known as 401(k) plans), which permit contributions on a before-tax and after-tax basis. Employees may contribute to various investment alternatives. In most of these plans, we match a portion of the employees’ contributions. More than 90% of our pension plan assets are held in a single trust for our primary U.S. government and commercial pension plans. On December 31, 2017 , the trust was invested largely in publicly traded equities, fixed-income securities and commingled funds comprised of equity securities. The trust also invests in other asset classes consistent with our investment policy. Our investments in equity assets include U.S. and international securities and equity funds. Our investments in fixed-income assets include U.S. Treasury and U.S. agency securities, corporate bonds, mortgage-backed securities and other asset-backed securities. Our investment policy allows the use of derivative instruments when appropriate to reduce anticipated asset volatility, to gain exposure to an asset class or to adjust the duration of fixed-income assets. Assets for our non-U.S. pension plans are held in trusts in the countries in which the related operations reside. Our non-U.S. operations maintain investment policies for their individual plans based on country-specific regulations. The non-U.S. plan assets are invested primarily in commingled funds comprised of equity and fixed-income securities. We hold assets in VEBA trusts for some of our other post-retirement benefit plans. These assets are managed by a third-party investment manager with oversight by management and are generally invested in equities, fixed-income securities and commingled funds comprised of equity and fixed-income securities. Our asset allocation strategy for the VEBA trusts considers potential fluctuations in our other post-retirement benefit obligation, the taxable nature of certain VEBA trusts, tax deduction limits on contributions and the regulatory environment. Our retirement plan assets are reported at fair value. See Note E for a discussion of the hierarchy for determining fair value. Our Level 1 assets include investments in publicly traded equity securities. These securities are actively traded and valued using quoted prices for identical securities from the market exchanges. Our Level 2 assets consist of fixed-income securities and commingled funds whose underlying investments are valued using observable marketplace inputs. The fair value of plan assets invested in fixed-income securities is generally determined using valuation models that use observable inputs such as interest rates, bond yields, low-volume market quotes and quoted prices for similar assets. Our plan assets that are invested in commingled funds are valued using a unit price or net asset value (NAV) that is based on the underlying investments of the fund. Our Level 3 assets include real estate funds, insurance deposit contracts and direct private equity investments. Certain investments valued using NAV as a practical expedient are excluded from the fair value hierarchy. These investments are redeemable at NAV on a monthly or quarterly basis and have redemption notice periods of up to 90 days . Government Contract Considerations Our contractual arrangements with the U.S. government provide for the recovery of contributions to our pension and other post-retirement benefit plans covering employees working in our defense business groups. For non-funded plans, our government contracts allow us to recover claims paid. Following payment, these recoverable amounts are allocated to contracts and billed to the customer in accordance with the Cost Accounting Standards (CAS) and specific contractual terms. For some of these plans, the cumulative pension and other post-retirement benefit cost exceeds the amount currently allocable to contracts. To the extent recovery of the cost is considered probable based on our backlog and probable follow-on contracts, we defer the excess in other contract costs in other current assets on the Consolidated Balance Sheet until the cost is allocable to contracts. See Note A for a discussion of our other contract costs. For other plans, the amount allocated to contracts and included in revenue has exceeded the plans’ cumulative benefit cost. We have deferred recognition of these excess earnings on the Consolidated Balance Sheet. Defined-benefit Retirement Plan Summary Financial Information Estimating retirement plan assets, liabilities and costs requires the extensive use of actuarial assumptions. These include the long-term rate of return on plan assets, the interest rates used to discount projected benefit payments, healthcare cost trend rates and future salary increases. Given the long-term nature of the assumptions being made, actual outcomes can and often do differ from these estimates. Our annual benefit cost consists of three primary elements: the cost of benefits earned by employees for services rendered during the year, an interest charge on our plan liabilities and an assumed return on our plan assets for the year. The annual cost also includes gains and losses resulting from changes in actuarial assumptions, differences between the actual and assumed long-term rate of return on assets, and gains and losses resulting from changes we make to plan benefit terms. We recognize an asset or liability on the Consolidated Balance Sheet equal to the funded status of each of our defined-benefit retirement plans. The funded status is the difference between the fair value of the plan’s assets and its benefit obligation. Changes in plan assets and liabilities due to differences between actuarial assumptions and the actual results of the plan are deferred in OCL rather than charged to earnings. These differences are then amortized over future years as a component of our annual benefit cost. We amortize actuarial differences under qualified plans on a straight-line basis over the average remaining service period of eligible employees. If all of a plan’s participants are inactive, we amortize these differences over the average remaining life expectancy of the plan participants. We recognize the difference between the actual and expected return on plan assets for qualified plans over five years. The deferral of these differences reduces the volatility of our annual benefit cost that can result either from year-to-year changes in the assumptions or from actual results that are not necessarily representative of the long-term financial position of these plans. We recognize differences under nonqualified plans immediately. We base the discount rates on a current yield curve developed from a portfolio of high-quality, fixed-income investments with maturities consistent with the projected benefit payout period. Beginning in 2016, we refined the method used to determine the service and interest cost components of our net annual benefit cost. Previously, the cost was determined using a single weighted-average discount rate derived from the yield curve described above. Under the refined method, known as the spot rate approach, we use individual spot rates along the yield curve that correspond with the timing of each service cost and discounted benefit obligation payment. We believe this change provides a more precise measurement of service and interest costs by improving the correlation between projected service cost and discounted benefit obligation cash outflows and corresponding spot rates on the yield curve. We accounted for this change prospectively as a change in accounting estimate. We determine the long-term rate of return on assets based on consideration of historical and forward-looking returns and the current and expected asset allocation strategy. In 2017, we decreased the expected long-term rate of return on assets in our primary U.S. government and commercial pension plans by 75 basis points following an assessment of the historical and expected long-term returns of our various asset classes. Retirement plan assumptions are based on our best judgment, including consideration of current and future market conditions. Changes in these estimates impact future pension and other post-retirement benefit cost. As discussed above, we defer recognition of the cumulative benefit cost for our government plans in excess of costs allocated to contracts and included in revenue. Therefore, the impact of annual changes in financial reporting assumptions on the cost for these plans does not immediately affect our operating results. Retirement Plan Assumptions We calculate the plan assets and liabilities for a given year and the net annual benefit cost for the subsequent year using assumptions determined as of December 31 of the year in question.
Business Group Information	We operate in four business groups: Aerospace, Combat Systems, Information Systems and Technology, and Marine Systems. We organize our business groups in accordance with the nature of products and services offered. We measure each group’s profitability based on operating earnings. As a result, we do not allocate net interest, other income and expense items, and income taxes to our business groups.

Summary Of Significant Accoun29

Summary Of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Interest, Net	Net interest expense consisted of the following: Year Ended December 31 2017 2016 2015 Interest expense $ 117 $ 99 $ 98 Interest income (14 ) (8 ) (15 ) Interest expense, net $ 103 $ 91 $ 83

Revenue (Tables)

Revenue (Tables)	12 Months Ended
	Dec. 31, 2017
Revenue Recognition [Abstract]
Schedule of Impact of Adjustments in Contract Estimates	Year Ended December 31 2017 2016 2015 Revenue $ 292 $ 95 $ 356 Operating earnings 323 16 271 Diluted earnings per share $ 0.69 $ 0.03 $ 0.54
Revenue by Major Product Line	Revenue by major products and services was as follows: Year Ended December 31 2017 2016 2015 Aircraft manufacturing, outfitting and completions $ 6,320 $ 6,074 $ 7,497 Aircraft services 1,743 1,625 1,569 Pre-owned aircraft 66 116 111 Total Aerospace 8,129 7,815 9,177 Wheeled combat and tactical vehicles 2,506 2,444 2,597 Weapons systems, armament and munitions 1,633 1,517 1,508 Tanks and tracked vehicles 1,225 934 805 Engineering and other services 585 635 733 Total Combat Systems 5,949 5,530 5,643 C4ISR solutions 4,481 4,716 4,419 IT services 4,410 4,428 4,510 Total Information Systems and Technology 8,891 9,144 8,929 Nuclear-powered submarines 5,175 5,264 5,010 Surface combatants 1,043 994 1,081 Auxiliary and commercial ships 564 654 672 Repair and other services 1,222 1,160 1,269 Total Marine Systems 8,004 8,072 8,032 Total revenue $ 30,973 $ 30,561 $ 31,781
Revenue by Contract Type	Revenue by contract type was as follows: Year Ended December 31, 2017 Aerospace Combat Systems Information Systems and Technology Marine Systems Total Fixed-price $ 7,479 $ 5,090 $ 3,943 $ 4,808 $ 21,320 Cost-reimbursement — 823 4,143 3,186 8,152 Time-and-materials 650 36 805 10 1,501 Total revenue $ 8,129 $ 5,949 $ 8,891 $ 8,004 $ 30,973 Year Ended December 31, 2016 Fixed-price $ 7,208 $ 4,629 $ 4,251 $ 4,857 $ 20,945 Cost-reimbursement — 865 4,084 3,204 8,153 Time-and-materials 607 36 809 11 1,463 Total revenue $ 7,815 $ 5,530 $ 9,144 $ 8,072 $ 30,561 Year Ended December 31, 2015 Fixed-price $ 8,583 $ 4,776 $ 4,066 $ 5,334 $ 22,759 Cost-reimbursement — 838 4,029 2,685 7,552 Time-and-materials 594 29 834 13 1,470 Total revenue $ 9,177 $ 5,643 $ 8,929 $ 8,032 $ 31,781
Revenue by Customer	Revenue by customer was as follows: Year Ended December 31, 2017 Aerospace Combat Systems Information Systems and Technology Marine Systems Total U.S. government: Department of Defense (DoD) $ 189 $ 2,618 $ 4,970 $ 7,721 $ 15,498 Non-DoD — 92 2,755 — 2,847 Foreign Military Sales (FMS) 42 374 68 192 676 Total U.S. government 231 3,084 7,793 7,913 19,021 U.S. commercial 3,885 220 322 71 4,498 Non-U.S. government 210 2,580 610 13 3,413 Non-U.S. commercial 3,803 65 166 7 4,041 Total revenue $ 8,129 $ 5,949 $ 8,891 $ 8,004 $ 30,973 Year Ended December 31, 2016 U.S. government: DoD $ 231 $ 2,200 $ 5,201 $ 7,507 $ 15,139 Non-DoD — 81 2,735 8 2,824 FMS 130 333 48 202 713 Total U.S. government 361 2,614 7,984 7,717 18,676 U.S. commercial 3,501 287 367 329 4,484 Non-U.S. government 496 2,520 621 26 3,663 Non-U.S. commercial 3,457 109 172 — 3,738 Total revenue $ 7,815 $ 5,530 $ 9,144 $ 8,072 $ 30,561 Year Ended December 31, 2015 U.S. government: DoD $ 98 $ 2,225 $ 5,047 $ 7,324 $ 14,694 Non-DoD — 83 2,736 12 2,831 FMS 6 282 38 127 453 Total U.S. government 104 2,590 7,821 7,463 17,978 U.S. commercial 4,334 242 385 541 5,502 Non-U.S. government 560 2,714 558 28 3,860 Non-U.S. commercial 4,179 97 165 — 4,441 Total revenue $ 9,177 $ 5,643 $ 8,929 $ 8,032 $ 31,781

Acquisitions, Goodwill and In31

Acquisitions, Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The changes in the carrying amount of goodwill by reporting unit were as follows: Aerospace Combat Systems Information Systems and Technology Marine Systems Total Goodwill December 31, 2015 (a) $ 2,542 $ 2,591 $ 6,021 $ 289 $ 11,443 Acquisitions (b) 29 — 2 — 31 Other (c) (34 ) 7 (10 ) 8 (29 ) December 31, 2016 (a) 2,537 2,598 6,013 297 11,445 Acquisitions (b) 28 — 269 — 297 Other (c) 73 79 20 — 172 December 31, 2017 (a) $ 2,638 $ 2,677 $ 6,302 $ 297 $ 11,914 (a) Goodwill in the Information Systems and Technology reporting unit is net of $2 billion of accumulated impairment losses. (b) Includes adjustments during the purchase price allocation period. (c) Consists primarily of adjustments for foreign currency translation
Intangible Assets	Intangible assets consisted of the following: Gross Carrying Amount (a) Accumulated Amortization Net Carrying Amount Gross Carrying Amount (a) Accumulated Amortization Net Carrying Amount December 31 2017 2016 Contract and program intangible assets (b) $ 1,684 $ (1,320 ) $ 364 $ 1,633 $ (1,281 ) $ 352 Trade names and trademarks 465 (160 ) 305 446 (139 ) 307 Technology and software 137 (105 ) 32 121 (102 ) 19 Other intangible assets 155 (154 ) 1 154 (154 ) — Total intangible assets $ 2,441 $ (1,739 ) $ 702 $ 2,354 $ (1,676 ) $ 678 (a) Change in gross carrying amounts consists primarily of adjustments for acquired intangible assets and foreign currency translation. (b) Consists of acquired backlog and probable follow-on work and associated customer relationships
Amortization Lives (In Years) Of Intangible Assets	The amortization lives (in years) of our intangible assets on December 31, 2017 , were as follows: Range of Amortization Life Contract and program intangible assets 7-30 Trade names and trademarks 30 Technology and software 5-15 Other intangible assets 7
Expected Amortization Expense Over Next Five Years	We expect to record annual amortization expense over the next five years as follows: 2018 $ 80 2019 67 2020 62 2021 57 2022 50

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Basic and diluted weighted average shares outstanding	Basic and diluted weighted average shares outstanding were as follows (in thousands): Year Ended December 31 2017 2016 2015 Basic weighted average shares outstanding 299,172 304,707 321,313 Dilutive effect of stock options and restricted stock/RSUs* 5,465 5,680 5,339 Diluted weighted average shares outstanding 304,637 310,387 326,652 * Excludes outstanding options to purchase shares of common stock that had exercise prices in excess of the average market price of our common stock during the year and, therefore, the effect of including these options would be antidilutive. These options totaled 1,547 in 2017 , 4,201 in 2016 and 1,706 in 2015 .

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Carrying And Fair Values Of Other Financial Assets And Liabilities	The following tables present the fair values of our other financial assets and liabilities on December 31, 2017 and 2016 , and the basis for determining their fair values: Carrying Value Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) (b) Financial Assets (Liabilities) (a) December 31, 2017 Marketable securities held in trust $ 191 $ 191 $ 69 $ 122 Cash flow hedges (105 ) (105 ) — (105 ) Short- and long-term debt principal (4,032 ) (3,974 ) — (3,974 ) December 31, 2016 Marketable securities held in trust $ 177 $ 177 $ 59 $ 118 Cash flow hedges (477 ) (477 ) — (477 ) Short- and long-term debt principal (3,924 ) (3,849 ) — (3,849 ) (a) We had no Level 3 financial instruments on December 31, 2017 or 2016 . (b) Determined under a market approach using valuation models that incorporate observable inputs such as interest rates, bond yields and quoted prices for similar assets and liabilities.

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Net Provision For Income Taxes For Continuing Operations	The following is a summary of our net provision for income taxes for continuing operations: Year Ended December 31 2017 2016 2015 Current: U.S. federal $ 656 $ 698 $ 841 State 31 24 31 International 77 71 98 Total current 764 793 970 Deferred: U.S. federal 215 140 163 State 7 7 7 International 60 37 43 Adjustment for enacted change in U.S. tax law 119 — — Total deferred 401 184 213 Provision for income taxes, net $ 1,165 $ 977 $ 1,183 Net income tax payments $ 617 $ 959 $ 871
Reconciliation From Statutory Federal Income Tax Rate To Effective Income Tax Rate	The reconciliation from the statutory federal income tax rate to our effective income tax rate follows: Year Ended December 31 2017 2016 2015 Statutory federal income tax rate 35.0 % 35.0 % 35.0 % State tax on commercial operations, net of federal benefits 0.6 0.6 0.5 Impact of international operations (4.5 ) (4.0 ) (1.3 ) Domestic production deduction (1.5 ) (1.5 ) (1.6 ) Equity-based compensation (2.6 ) (2.3 ) — Domestic tax credits (0.8 ) (0.9 ) (1.1 ) Contract close-outs — — (2.8 ) Impact of enacted change in U.S. tax law 2.9 — — Other, net (0.5 ) (0.2 ) (0.7 ) Effective income tax rate 28.6 % 26.7 % 28.0 %
Tax Effects Of Temporary Differences Between Reported Earnings And Taxable Earnings	The tax effects of temporary differences between reported earnings and taxable income consisted of the following: December 31 2017 2016 Retirement benefits $ 935 $ 1,461 Tax loss and credit carryforwards 437 480 Salaries and wages 137 257 Workers’ compensation 139 235 Other 335 396 Deferred assets 1,983 2,829 Valuation allowances (402 ) (406 ) Net deferred assets $ 1,581 $ 2,423 Intangible assets $ (688 ) $ (1,049 ) Contract accounting methods (500 ) (188 ) Property, plant and equipment (182 ) (320 ) Capital Construction Fund qualified ships (159 ) (240 ) Other (221 ) (245 ) Deferred liabilities $ (1,750 ) $ (2,042 ) Net deferred tax (liability) asset $ (169 ) $ 381
Net Deferred Tax Asset (Liability)	Our net deferred tax asset (liability) consisted of the following: December 31 2017 2016 Deferred tax asset $ 75 $ 564 Deferred tax liability (244 ) (183 ) Net deferred tax (liability) asset $ (169 ) $ 381

Accounts Receivable (Tables)

Accounts Receivable (Tables)	12 Months Ended
	Dec. 31, 2017
Accounts Receivable, Net [Abstract]
Accounts Receivable	Accounts receivable consisted of the following: December 31 2017 2016 Non-U.S. government $ 2,228 $ 2,147 U.S. government 971 793 Commercial 418 459 Total accounts receivable $ 3,617 $ 3,399

Unbilled Receivables (Tables)

Unbilled Receivables (Tables)	12 Months Ended
	Dec. 31, 2017
Contractors [Abstract]
Schedule of Unbilled Receivables	Unbilled receivables consisted of the following: December 31 2017 2016 Unbilled revenue $ 21,845 $ 25,543 Advances and progress billings (16,605 ) (21,331 ) Net unbilled receivables $ 5,240 $ 4,212

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2017
Inventory Disclosure [Abstract]
Schedule Of Inventories	Inventories consisted of the following: December 31 2017 2016 Work in process $ 3,872 $ 3,643 Raw materials 1,357 1,429 Finished goods 51 24 Pre-owned aircraft 23 22 Total inventories $ 5,303 $ 5,118

Property, Plant And Equipment38

Property, Plant And Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Property, Plant And Equipment, Net	The major classes of PP&E were as follows: December 31 2017 2016 Machinery and equipment $ 4,736 $ 4,582 Buildings and improvements 2,837 2,745 Land and improvements 357 333 Construction in process 307 269 Total PP&E 8,237 7,929 Accumulated depreciation (4,720 ) (4,452 ) PP&E, net $ 3,517 $ 3,477

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Schedule Of Debt	Debt consisted of the following: December 31 2017 2016 Fixed-rate notes due: Interest rate: November 2017 1.000% $ — $ 900 July 2021 3.875% 500 500 November 2022 2.250% 1,000 1,000 August 2023 1.875% 500 500 November 2024 2.375% 500 — August 2026 2.125% 500 500 November 2027 2.625% 500 — November 2042 3.600% 500 500 Other Various 32 24 Total debt principal 4,032 3,924 Less unamortized debt issuance costs and discounts 50 36 Total debt 3,982 3,888 Less current portion 2 900 Long-term debt $ 3,980 $ 2,988
Schedule of Maturities of Long-term Debt	The aggregate amounts of scheduled principal maturities of our debt for the next five years are as follows: Year Ended December 31 2018 $ 2 2019 3 2020 3 2021 503 2022 1,003 Thereafter 2,518 Total debt principal $ 4,032

Other Liabilities (Tables)

Other Liabilities (Tables)	12 Months Ended
	Dec. 31, 2017
Other Liabilities Disclosure [Abstract]
Summary Of Significant Other Liabilities By Balance Sheet Caption	A summary of significant other liabilities by balance sheet caption follows: December 31 2017 2016 Salaries and wages $ 786 $ 693 Fair value of cash flow hedges 180 521 Workers’ compensation 320 337 Retirement benefits 295 303 Other (a) 1,317 1,331 Total other current liabilities $ 2,898 $ 3,185 Retirement benefits $ 4,408 $ 4,393 Customer deposits on commercial contracts 814 719 Deferred income taxes 244 183 Other (b) 1,066 1,138 Total other liabilities $ 6,532 $ 6,433 (a) Consists primarily of dividends payable, taxes payable, environmental remediation reserves, warranty reserves, deferred revenue and supplier contributions in the Aerospace group, liabilities of discontinued operations, and insurance-related costs. (b) Consists primarily of warranty reserves, workers’ compensation liabilities and liabilities of discontinued operations.

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2017
Stockholders' Equity Note [Abstract]
Schedule Of Accumulated Other Comprehensive Income	The changes, pretax and net of tax, in each component of accumulated other comprehensive loss (AOCL) consisted of the following: Losses on Cash Flow Hedges Unrealized Gains on Securities Foreign Currency Translation Adjustments Changes in Retirement Plans’ Funded Status AOCL December 31, 2014 $ (173 ) $ 22 $ 541 $ (3,322 ) $ (2,932 ) Other comprehensive loss, pretax (394 ) (2 ) (371 ) 500 (267 ) Provision for income tax, net (80 ) — (11 ) 175 84 Other comprehensive loss, net of tax (314 ) (2 ) (360 ) 325 (351 ) December 31, 2015 (487 ) 20 181 (2,997 ) (3,283 ) Other comprehensive loss, pretax 191 (9 ) (112 ) (192 ) (122 ) Benefit for income tax, net 49 (3 ) — (64 ) (18 ) Other comprehensive loss, net of tax 142 (6 ) (112 ) (128 ) (104 ) December 31, 2016 (345 ) 14 69 (3,125 ) (3,387 ) Other comprehensive income, pretax 341 9 348 20 718 Provision for income tax, net 90 4 15 42 151 Other comprehensive income, net of tax 251 5 333 (22 ) 567 December 31, 2017 $ (94 ) $ 19 $ 402 $ (3,147 ) $ (2,820 )

Commitments And Contingencies (

Commitments And Contingencies (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases	Future minimum lease payments are as follows: Year Ended December 31 2018 $ 258 2019 215 2020 148 2021 118 2022 94 Thereafter 526 Total minimum lease payments $ 1,359
Schedule Of Changes In Carrying Amount Of Warranty Liabilities	The changes in the carrying amount of warranty liabilities for each of the past three years were as follows: Year Ended December 31 2017 2016 2015 Beginning balance $ 474 $ 434 $ 428 Warranty expense 146 155 162 Payments (123 ) (100 ) (120 ) Adjustments* (30 ) (15 ) (36 ) Ending balance $ 467 $ 474 $ 434

Equity Compensation Plans (Tabl

Equity Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule Of Equity-Based Compensation Expense	The following table details the components of equity-based compensation expense recognized in net earnings in each of the past three years: Year Ended December 31 2017 2016 2015 Stock options $ 34 $ 25 $ 32 Restricted stock/RSUs 46 36 32 Total equity-based compensation expense, net of tax $ 80 $ 61 $ 64
Schedule Of Assumptions Of Fair Value Options On The Date Of Grant Using Black-Scholes Option Pricing Model	We estimate the fair value of stock options on the date of grant using the Black-Scholes option pricing model with the following assumptions for each of the past three years: Year Ended December 31 2017 2016 2015 Expected volatility 17.3-19.4% 19.1-20.0% 20.1-24.1% Weighted average expected volatility 19.4 % 20.0 % 24.0 % Expected term (in months) 68 70 74 Risk-free interest rate 2.0-2.2% 1.5-1.6% 1.7-1.9% Expected dividend yield 1.8 % 2.0 % 2.0 %
Summary Of Stock Option Activity	A summary of stock option activity during 2017 follows: In Shares and Dollars Shares Under Option Weighted Average Exercise Price Per Share Outstanding on December 31, 2016 10,934,621 $ 108.23 Granted 1,870,260 191.84 Exercised (2,020,882 ) 88.75 Forfeited/canceled (163,610 ) 145.72 Outstanding on December 31, 2017 10,620,389 $ 126.08 Vested and expected to vest on December 31, 2017 10,470,666 $ 125.45 Exercisable on December 31, 2017 5,286,882 $ 96.52
Schedule Of Stock Options' Intrinsic Value And Remaining Contractual Term	Summary information with respect to our stock options’ intrinsic value and remaining contractual term on December 31, 2017 , follows: Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value Outstanding 5.7 $ 822 Vested and expected to vest 5.6 817 Exercisable 3.1 565
Summary Of Restricted Stock And Restricted Stock Unit Activity	A summary of restricted stock and RSU activity during 2017 follows: In Shares and Dollars Shares/ Share-Equivalent Units Weighted Average Grant-Date Fair Value Per Share Nonvested at December 31, 2016 2,806,128 $ 101.54 Granted 341,558 191.83 Vested (1,139,028 ) 67.80 Forfeited (25,485 ) 142.37 Nonvested at December 31, 2017 1,983,173 $ 135.38

Retirement Plans (Tables)

Retirement Plans (Tables)	12 Months Ended
	Dec. 31, 2017
Retirement Benefits [Abstract]
Schedule Of Benefits To Be Paid From Retirement Plans Over The Next Ten Years	We expect the following benefits to be paid from our retirement plans over the next 10 years: Pension Benefits Other Post-retirement 2018 $ 626 $ 64 2019 648 64 2020 676 63 2021 704 63 2022 730 62 2023-2027 4,013 292
Schedule of Annual Pension and Other Post-retirement Benefit Costs	Net annual defined-benefit pension and other post-retirement benefit cost (credit) consisted of the following: Pension Benefits Year Ended December 31 2017 2016 2015 Service cost $ 168 $ 173 $ 210 Interest cost 453 456 529 Expected return on plan assets (679 ) (713 ) (693 ) Recognized net actuarial loss 362 343 417 Amortization of prior service credit (66 ) (68 ) (67 ) Net annual benefit cost $ 238 $ 191 $ 396 Other Post-retirement Benefits Year Ended December 31 2017 2016 2015 Service cost $ 9 $ 10 $ 11 Interest cost 30 34 44 Expected return on plan assets (34 ) (33 ) (32 ) Recognized net actuarial (gain) loss (4 ) (3 ) 6 Amortization of prior service credit (3 ) (6 ) (5 ) Net annual benefit (credit) cost $ (2 ) $ 2 $ 24
Reconciliation Of Benefit Obligations And Plan or Trust Assets And Resulting Funded Status Of Defined Benefit Retirement Plans	The following is a reconciliation of the benefit obligations and plan/trust assets, and the resulting funded status, of our defined-benefit retirement plans: Pension Benefits Other Post-retirement Benefits Year Ended December 31 2017 2016 2017 2016 Change in Benefit Obligation Benefit obligation at beginning of year $ (13,022 ) $ (12,554 ) $ (1,005 ) $ (991 ) Service cost (168 ) (173 ) (9 ) (10 ) Interest cost (453 ) (456 ) (30 ) (34 ) Amendments 1 — — (13 ) Actuarial loss (1,098 ) (383 ) (42 ) (18 ) Settlement/curtailment/other (58 ) (4 ) 27 (3 ) Benefits paid 586 548 63 64 Benefit obligation at end of year $ (14,212 ) $ (13,022 ) $ (996 ) $ (1,005 ) Change in Plan/Trust Assets Fair value of assets at beginning of year $ 8,980 $ 8,608 $ 499 $ 527 Actual return on plan assets 1,469 694 82 9 Employer contributions 199 208 3 5 Settlement/curtailment/other 56 5 — — Benefits paid (574 ) (535 ) (43 ) (42 ) Fair value of assets at end of year $ 10,130 $ 8,980 $ 541 $ 499 Funded status at end of year $ (4,082 ) $ (4,042 ) $ (455 ) $ (506 )
Amounts Recognized On Consolidated Balance Sheet	Amounts recognized on the Consolidated Balance Sheet consisted of the following: Pension Benefits Other Post-retirement Benefits December 31 2017 2016 2017 2016 Noncurrent assets $ 133 $ 138 $ 33 $ 10 Current liabilities (145 ) (132 ) (150 ) (171 ) Noncurrent liabilities (4,070 ) (4,048 ) (338 ) (345 ) Net liability recognized $ (4,082 ) $ (4,042 ) $ (455 ) $ (506 )
Amounts Deferred In AOCI	The following is a reconciliation of the change in AOCL for our defined-benefit retirement plans: Pension Benefits Other Post-retirement Benefits Year Ended December 31 2017 2016 2017 2016 Net actuarial loss (gain) $ 308 $ 402 $ (6 ) $ 42 Prior service cost (1 ) — — 13 Amortization of: Net actuarial (loss) gain from prior years (362 ) (343 ) 4 3 Prior service credit 66 68 3 6 Other* 7 1 (39 ) — Change in AOCL, pretax $ 18 $ 128 $ (38 ) $ 64 * Includes foreign exchange translation, curtailment and other adjustments. Amounts deferred in AOCL consisted of the following: Pension Benefits Other Post-retirement Benefits December 31 2017 2016 2017 2016 Net actuarial loss (gain) $ 4,899 $ 4,947 $ (5 ) $ 36 Prior service credit (124 ) (190 ) (3 ) (6 ) Total amount recognized in AOCL, pretax $ 4,775 $ 4,757 $ (8 ) $ 30
Amounts Deferred In AOCI On The Consolidated Balance Sheet	The following table represents amounts deferred in AOCL on the Consolidated Balance Sheet on December 31, 2017 , that we expect to recognize in our retirement benefit cost in 2018 : Pension Other Post-retirement Net actuarial loss (gain) $ 387 $ (4 ) Prior service credit (44 ) (3 )
Schedule Of ABO That Exceeded The Plans' Assets	On December 31, 2017 and 2016 , some of our pension plans had an ABO that exceeded the plans’ assets. Summary information for those plans follows: December 31 2017 2016 PBO $ (13,660 ) $ (12,817 ) ABO (13,398 ) (12,557 ) Fair value of plan assets 9,526 8,722
Assumptions Used To Determine Benefit Obligations And Benefit Costs	The following table summarizes the weighted average assumptions used to determine our benefit obligations: Assumptions on December 31 2017 2016 Pension Benefits Benefit obligation discount rate 3.62 % 4.19 % Rate of increase in compensation levels 2.82 % 2.92 % Other Post-retirement Benefits Benefit obligation discount rate 3.64 % 4.11 % Healthcare cost trend rate: Trend rate for next year 6.50 % 6.50 % Ultimate trend rate 5.00 % 5.00 % Year rate reaches ultimate trend rate 2024 2024 The following table summarizes the weighted average assumptions used to determine our net annual benefit cost: Assumptions for Year Ended December 31 2017 2016 2015 Pension Benefits Discount rates: Benefit obligation 4.19 % 4.46 % 4.10 % Service cost 4.13 % 4.42 % * Interest cost 3.56 % 3.71 % * Expected long-term rate of return on assets 7.43 % 8.14 % 8.15 % Rate of increase in compensation levels 2.90 % 3.39 % 3.43 % Other Post-retirement Benefits Discount rates: Benefit obligation 4.11 % 4.35 % 4.03 % Service cost 4.34 % 4.52 % * Interest cost 3.43 % 3.53 % * Expected long-term rate of return on assets 7.76 % 7.81 % 8.03 % * Not applicable as we changed to the spot rate approach beginning in 2016 as further described below.
Defined Benefit Plan, Effect of Point Twenty Five Percentage Point Change on Net Cost	For our U.S. pension plans that represent the majority of our total obligation, the following hypothetical changes in the discount rates and expected long-term rates of return on plan assets would have had the following impact in 2017 : Increase 25 Basis Points Decrease 25 Basis Points Increase (decrease) to net pension cost from: Change in discount rates $ (28 ) $ 30 Change in long-term rates of return on plan assets (21 ) 21
Schedule Of Asset Allocation Policy Ranges	At the end of 2017 , our asset allocation policy ranges were: Equities 48-68% Fixed income 20-48% Cash 0-5% Other asset classes 0-16%
Fair Value Of Plan Assets By Investment Category And The Corresponding Level Within The Fair Value Hierarchy	The fair value of our other post-retirement plan assets by category and the corresponding level within the fair value hierarchy were as follows: Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Asset Category (a) December 31, 2017 Cash equivalents $ 18 $ — $ 18 Equity securities 70 70 — Fixed-income securities 89 — 89 Commingled funds: Equity funds 260 — 260 Fixed-income funds 99 — 99 Real estate funds 2 2 — Total plan assets in fair value hierarchy $ 538 $ 72 $ 466 Plan assets measured using NAV as a practical expedient (b): Hedge funds 1 Real estate funds 2 Total other post-retirement plan assets $ 541 (a) We had no Level 3 investments on December 31, 2017 . (b) Investments measured at fair value using NAV as a practical expedient are not classified in the fair value hierarchy. The fair value amounts presented in this table for these investments are included to permit reconciliation of the fair value hierarchy to the total plan assets. Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Asset Category (a) December 31, 2016 Cash equivalents $ 10 $ — $ 10 Equity securities 69 69 — Fixed-income securities 88 — 88 Commingled funds: Equity funds 236 — 236 Fixed-income funds 92 — 92 Real estate funds 2 2 — Total plan assets in fair value hierarchy $ 497 $ 71 $ 426 Plan assets measured using NAV as a practical expedient (b): Hedge funds 1 Real estate funds 1 Total other post-retirement plan assets $ 499 (a) We had no Level 3 investments on December 31, 2016 . (b) Investments measured at fair value using NAV as a practical expedient are not classified in the fair value hierarchy. The fair value amounts presented in this table for these investments are included to permit reconciliation of the fair value hierarchy to the total plan assets. The fair value of our pension plan assets by investment category and the corresponding level within the fair value hierarchy were as follows: Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Asset Category December 31, 2017 Cash and equivalents $ 48 $ — $ 48 $ — Equity securities (a): U.S. companies 770 770 — — Non-U.S. companies 97 97 — — Private equity investments 18 — — 18 Fixed-income securities: Treasury securities 1,361 — 1,361 — Corporate bonds (b) 1,604 — 1,604 — Commingled funds: Equity funds 5,018 — 5,018 — Fixed-income funds 325 — 325 — Real estate funds 51 — — 51 Other investments: Insurance deposit contracts 120 — — 120 Total plan assets in fair value hierarchy $ 9,412 $ 867 $ 8,356 $ 189 Plan assets measured using NAV as a practical expedient (c): Hedge funds 328 Real estate funds 390 Total pension plan assets $ 10,130 (a) No single equity holding amounted to more than 1% of the total fair value. (b) Our corporate bond investments had an average rating of A+ . (c) Investments measured at fair value using NAV as a practical expedient are not classified in the fair value hierarchy. The fair value amounts presented in this table for these investments are included to permit reconciliation of the fair value hierarchy to the total plan assets. Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Asset Category December 31, 2016 Cash and equivalents $ 71 $ 10 $ 61 $ — Equity securities (a): U.S. companies 786 786 — — Non-U.S. companies 74 74 — — Private equity investments 13 — — 13 Fixed-income securities: Treasury securities 239 — 239 — Corporate bonds (b) 2,115 — 2,115 — Commingled funds: Equity funds 4,285 — 4,285 — Fixed-income funds 567 — 567 — Real estate funds 42 — — 42 Other investments: Insurance deposit contracts 109 — — 109 Total plan assets in fair value hierarchy $ 8,301 $ 870 $ 7,267 $ 164 Plan assets measured using NAV as a practical expedient (c): Hedge funds 314 Real estate funds 365 Total pension plan assets $ 8,980 (a) No single equity holding amounted to more than 1% of the total fair value. (b) Our corporate bond investments had an average rating of BBB+ . (c) Investments measured at fair value using NAV as a practical expedient are not classified in the fair value hierarchy. The fair value amounts presented in this table for these investments are included to permit reconciliation of the fair value hierarchy to the total plan assets.
Schedule Of Changes In Level 3 Retirement Plan Assets	Changes in our Level 3 retirement plan assets during 2017 and 2016 were as follows: Private Equity Investments Real Estate Funds Insurance Deposits Contracts Total Level 3 Assets December 31, 2015 $ 12 $ 42 $ 103 $ 157 Actual return on plan assets: Unrealized losses, net 1 — (2 ) (1 ) Realized gains, net — — 3 3 Purchases, sales and settlements, net — — 5 5 December 31, 2016 13 42 109 164 Actual return on plan assets: Unrealized gains, net 1 4 4 9 Realized gains, net — — 2 2 Purchases, sales and settlements, net 4 5 5 14 December 31, 2017 $ 18 $ 51 $ 120 $ 189

Business Group Information (Tab

Business Group Information (Tables)	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Summary Of Financial Information For Each Of Our Business Groups	Summary financial information for each of our business groups follows: Revenue Operating Earnings Revenue from U.S. Government Year Ended December 31 2017 2016 2015 2017 2016 2015 2017 2016 2015 Aerospace $ 8,129 $ 7,815 $ 9,177 $ 1,593 $ 1,407 $ 1,807 $ 231 $ 361 $ 104 Combat Systems 5,949 5,530 5,643 937 831 886 3,084 2,614 2,590 Information Systems and Technology 8,891 9,144 8,929 1,011 941 895 7,793 7,984 7,821 Marine Systems 8,004 8,072 8,032 685 595 748 7,913 7,717 7,463 Corporate* — — — (49 ) (40 ) (41 ) — — — Total $ 30,973 $ 30,561 $ 31,781 $ 4,177 $ 3,734 $ 4,295 $ 19,021 $ 18,676 $ 17,978 * Corporate operating results consist primarily of stock option expense. Identifiable Assets Capital Expenditures Depreciation and Amortization Year Ended December 31 2017 2016 2015 2017 2016 2015 2017 2016 2015 Aerospace $ 10,126 $ 9,792 $ 9,411 $ 132 $ 125 $ 210 $ 147 $ 153 $ 146 Combat Systems 9,846 8,885 7,810 84 71 79 86 86 91 Information Systems and Technology 8,877 8,445 8,575 63 97 73 92 103 131 Marine Systems 2,906 3,063 3,030 123 92 166 109 105 106 Corporate* 3,291 2,987 3,712 26 7 41 7 6 7 Total $ 35,046 $ 33,172 $ 32,538 $ 428 $ 392 $ 569 $ 441 $ 453 $ 481 * Corporate identifiable assets are primarily cash and equivalents.
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area	The following table presents our revenue by geographic area based on the location of our customers: Year Ended December 31 2017 2016 2015 North America: United States $ 23,519 $ 23,160 $ 23,480 Other 915 709 1,121 Total North America 24,434 23,869 24,601 Europe 2,558 2,152 2,760 Asia/Pacific 2,011 1,650 1,589 Africa/Middle East 1,655 2,617 2,426 South America 315 273 405 Total revenue $ 30,973 $ 30,561 $ 31,781

Condensed Consolidating Finan46

Condensed Consolidating Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2017
Consolidating Financial Statements [Abstract]
Condensed Consolidating Statements of Earnings	CONDENSED CONSOLIDATING STATEMENTS OF EARNINGS Year Ended December 31, 2017 Parent Guarantors on a Combined Basis Other Subsidiaries Consolidating Adjustments Total Consolidated Revenue $ — $ 26,933 $ 4,040 $ — $ 30,973 Cost of sales (6 ) 21,684 3,108 — 24,786 G&A 53 1,642 315 — 2,010 Operating earnings (47 ) 3,607 617 — 4,177 Interest, net (97 ) 1 (7 ) — (103 ) Other, net 3 — — — 3 Earnings before income tax (141 ) 3,608 610 — 4,077 Provision for income tax, net (154 ) 1,262 57 — 1,165 Equity in net earnings of subsidiaries 2,899 — — (2,899 ) — Net earnings $ 2,912 $ 2,346 $ 553 $ (2,899 ) $ 2,912 Comprehensive income $ 3,479 $ 2,336 $ 1,158 $ (3,494 ) $ 3,479 Year Ended December 31, 2016 Revenue $ — $ 26,573 $ 3,988 $ — $ 30,561 Cost of sales — 21,785 3,102 — 24,887 G&A 39 1,585 316 — 1,940 Operating earnings (39 ) 3,203 570 — 3,734 Interest, net (91 ) (2 ) 2 — (91 ) Other, net 12 (4 ) 5 — 13 Earnings before income tax (118 ) 3,197 577 — 3,656 Provision for income tax, net (121 ) 1,055 43 — 977 Discontinued operations, net of tax (107 ) — — — (107 ) Equity in net earnings of subsidiaries 2,676 — — (2,676 ) — Net earnings $ 2,572 $ 2,142 $ 534 $ (2,676 ) $ 2,572 Comprehensive income $ 2,468 $ 2,112 $ 543 $ (2,655 ) $ 2,468 Year Ended December 31, 2015 Revenue $ — $ 27,730 $ 4,051 $ — $ 31,781 Cost of sales (6 ) 22,385 3,154 — 25,533 G&A 46 1,610 297 — 1,953 Operating earnings (40 ) 3,735 600 — 4,295 Interest, net (89 ) (1 ) 7 — (83 ) Other, net 4 2 1 — 7 Earnings before income tax (125 ) 3,736 608 — 4,219 Provision for income tax, net (151 ) 1,202 132 — 1,183 Equity in net earnings of subsidiaries 3,010 — — (3,010 ) — Net earnings $ 3,036 $ 2,534 $ 476 $ (3,010 ) $ 3,036 Comprehensive income $ 2,685 $ 2,745 $ (193 ) $ (2,552 ) $ 2,685
Condensed Consolidating Balance Sheet	CONDENSED CONSOLIDATING BALANCE SHEET December 31, 2017 Parent Guarantors on a Combined Basis Other Subsidiaries on a Combined Basis Consolidating Adjustments Total Consolidated ASSETS Current assets: Cash and equivalents $ 1,930 $ — $ 1,053 $ — $ 2,983 Accounts receivable — 1,259 2,358 — 3,617 Unbilled receivables — 2,547 2,693 — 5,240 Inventories — 5,216 87 — 5,303 Other current assets 351 461 373 — 1,185 Total current assets 2,281 9,483 6,564 — 18,328 Noncurrent assets: PP&E 221 6,779 1,237 — 8,237 Accumulated depreciation of PP&E (75 ) (3,869 ) (776 ) — (4,720 ) Intangible assets, net — 287 415 — 702 Goodwill — 8,320 3,594 — 11,914 Other assets 199 232 154 — 585 Investment in subsidiaries 44,887 — — (44,887 ) — Total noncurrent assets 45,232 11,749 4,624 (44,887 ) 16,718 Total assets $ 47,513 $ 21,232 $ 11,188 $ (44,887 ) $ 35,046 LIABILITIES AND SHAREHOLDERS’ EQUITY Current liabilities: Short-term debt and current portion of long-term debt $ — $ 1 $ 1 $ — $ 2 Customer advances and deposits — 4,180 2,812 — 6,992 Other current liabilities 561 3,758 1,786 — 6,105 Total current liabilities 561 7,939 4,599 — 13,099 Noncurrent liabilities: Long-term debt 3,950 21 9 — 3,980 Other liabilities 2,451 3,473 608 — 6,532 Total noncurrent liabilities 6,401 3,494 617 — 10,512 Intercompany 29,116 (28,494 ) (622 ) — — Shareholders’ equity: Common stock 482 6 2,126 (2,132 ) 482 Other shareholders’ equity 10,953 38,287 4,468 (42,755 ) 10,953 Total shareholders’ equity 11,435 38,293 6,594 (44,887 ) 11,435 Total liabilities and shareholders’ equity $ 47,513 $ 21,232 $ 11,188 $ (44,887 ) $ 35,046 CONDENSED CONSOLIDATING BALANCE SHEET December 31, 2016 Parent Guarantors on a Combined Basis Other Subsidiaries on a Combined Basis Consolidating Adjustments Total Consolidated ASSETS Current assets: Cash and equivalents $ 1,254 $ — $ 1,080 $ — $ 2,334 Accounts receivable — 1,155 2,244 — 3,399 Unbilled receivables — 2,235 1,977 — 4,212 Inventories — 5,022 96 — 5,118 Other current assets 634 599 238 — 1,471 Total current assets 1,888 9,011 5,635 — 16,534 Noncurrent assets: PP&E 197 6,586 1,146 — 7,929 Accumulated depreciation of PP&E (67 ) (3,653 ) (732 ) — (4,452 ) Intangible assets, net — 265 413 — 678 Goodwill — 8,050 3,395 — 11,445 Other assets 640 232 166 — 1,038 Investment in subsidiaries 41,956 — — (41,956 ) — Total noncurrent assets 42,726 11,480 4,388 (41,956 ) 16,638 Total assets $ 44,614 $ 20,491 $ 10,023 $ (41,956 ) $ 33,172 LIABILITIES AND SHAREHOLDERS’ EQUITY Current liabilities: Short-term debt and current portion of long-term debt $ 898 $ 2 $ — $ — $ 900 Customer advances and deposits — 4,339 2,488 — 6,827 Other current liabilities 564 3,465 1,694 — 5,723 Total current liabilities 1,462 7,806 4,182 — 13,450 Noncurrent liabilities: Long-term debt 2,966 22 — — 2,988 Other liabilities 3,520 2,330 583 — 6,433 Total noncurrent liabilities 6,486 2,352 583 — 9,421 Intercompany 26,365 (25,827 ) (538 ) — — Shareholders’ equity: Common stock 482 6 2,354 (2,360 ) 482 Other shareholders’ equity 9,819 36,154 3,442 (39,596 ) 9,819 Total shareholders’ equity 10,301 36,160 5,796 (41,956 ) 10,301 Total liabilities and shareholders’ equity $ 44,614 $ 20,491 $ 10,023 $ (41,956 ) $ 33,172
Condensed Consolidating Statements of Cash Flows	CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS Year Ended December 31, 2015 Parent Guarantors on a Combined Basis Other Subsidiaries on a Combined Basis Consolidating Adjustments Total Consolidated Net cash provided by operating activities* $ 50 $ 2,202 $ 355 $ — $ 2,607 Cash flows from investing activities: Capital expenditures (42 ) (475 ) (52 ) — (569 ) Maturities of held-to-maturity securities 500 — — — 500 Other, net 166 103 — — 269 Net cash provided by investing activities 624 (372 ) (52 ) — 200 Cash flows from financing activities: Purchases of common stock (3,233 ) — — — (3,233 ) Dividends paid (873 ) — — — (873 ) Repayment of fixed-rate notes (500 ) — — — (500 ) Other, net 237 2 — — 239 Net cash used by financing activities (4,369 ) 2 — — (4,367 ) Net cash used by discontinued operations (43 ) — — — (43 ) Cash sweep/funding by parent 2,934 (1,832 ) (1,102 ) — — Net decrease in cash and equivalents (804 ) — (799 ) — (1,603 ) Cash and equivalents at beginning of year 2,536 — 1,852 — 4,388 Cash and equivalents at end of year $ 1,732 $ — $ 1,053 $ — $ 2,785 * Continuing operations only. CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS Year Ended December 31, 2017 Parent Guarantors on a Combined Basis Other Subsidiaries on a Combined Basis Consolidating Adjustments Total Consolidated Net cash provided by operating activities* $ 316 $ 2,370 $ 1,193 $ — $ 3,879 Cash flows from investing activities: Capital expenditures (26 ) (330 ) (72 ) — (428 ) Business acquisitions, net of cash acquired — (350 ) (49 ) — (399 ) Other, net 6 32 (2 ) — 36 Net cash used by investing activities (20 ) (648 ) (123 ) — (791 ) Cash flows from financing activities: Purchases of common stock (1,558 ) — — — (1,558 ) Dividends paid (986 ) — — — (986 ) Proceeds from fixed-rate notes 985 — — — 985 Repayment of fixed-rate notes (900 ) — — — (900 ) Other, net 63 (3 ) — — 60 Net cash used by financing activities (2,396 ) (3 ) — — (2,399 ) Net cash used by discontinued operations (40 ) — — — (40 ) Cash sweep/funding by parent 2,816 (1,719 ) (1,097 ) — — Net increase in cash and equivalents 676 — (27 ) — 649 Cash and equivalents at beginning of year 1,254 — 1,080 — 2,334 Cash and equivalents at end of year $ 1,930 $ — $ 1,053 $ — $ 2,983 Year Ended December 31, 2016 Net cash provided by operating activities* $ 219 $ 1,914 $ 65 $ — $ 2,198 Cash flows from investing activities: Capital expenditures (8 ) (336 ) (48 ) — (392 ) Other, net 5 (1 ) (38 ) — (34 ) Net cash used by investing activities (3 ) (337 ) (86 ) — (426 ) Cash flows from financing activities: Purchases of common stock (1,996 ) — — — (1,996 ) Proceeds from fixed-rate notes 992 — — — 992 Dividends paid (911 ) — — — (911 ) Repayment of fixed-rate notes (500 ) — — — (500 ) Proceeds from stock option exercises 292 — — — 292 Other, net (45 ) (1 ) — — (46 ) Net cash used by financing activities (2,168 ) (1 ) — — (2,169 ) Net cash used by discontinued operations (54 ) — — — (54 ) Cash sweep/funding by parent 1,528 (1,576 ) 48 — — Net decrease in cash and equivalents (478 ) — 27 — (451 ) Cash and equivalents at beginning of year 1,732 — 1,053 — 2,785 Cash and equivalents at end of year $ 1,254 $ — $ 1,080 $ — $ 2,334 * Continuing operations only.

Prior-Period Financial Statem47

Prior-Period Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2017
Accounting Changes and Error Corrections [Abstract]
Prior-Period Financial Statements	CONSOLIDATED STATEMENT OF EARNINGS Year Ended Effect of the Adoption of Year Ended December 31, 2016 ASC ASU December 31, 2016 (Dollars in millions, except per-share amounts) As Reported Topic 606 2015-17 As Adjusted Revenue: Products $ 19,885 $ (875 ) $ — $ 19,010 Services 11,468 83 — 11,551 31,353 (792 ) — 30,561 Operating costs and expenses: Products 15,458 (299 ) — 15,159 Services 9,663 83 — 9,746 G&A 1,923 (1 ) — 1,922 27,044 (217 ) — 26,827 Operating earnings 4,309 (575 ) — 3,734 Interest, net (91 ) — — (91 ) Other, net 13 — — 13 Earnings from continuing operations before income tax 4,231 (575 ) — 3,656 Provision for income tax, net 1,169 (192 ) — 977 Earnings from continuing operations 3,062 (383 ) — 2,679 Discontinued operations, net of tax benefit of $51 (107 ) — — (107 ) Net earnings $ 2,955 $ (383 ) $ — $ 2,572 Earnings per share Basic: Continuing operations $ 10.05 $ (1.26 ) $ — $ 8.79 Discontinued operations (0.35 ) — — (0.35 ) Net earnings $ 9.70 $ (1.26 ) $ — $ 8.44 Diluted: Continuing operations $ 9.87 $ (1.23 ) $ — $ 8.64 Discontinued operations (0.35 ) — — (0.35 ) Net earnings $ 9.52 $ (1.23 ) $ — $ 8.29 CONSOLIDATED STATEMENT OF EARNINGS Year Ended Effect of the Adoption of Year Ended December 31, 2015 ASC ASU December 31, 2015 (Dollars in millions, except per-share amounts) As Reported Topic 606 2015-17 As Adjusted Revenue: Products $ 20,280 $ 197 $ — $ 20,477 Services 11,189 115 — 11,304 31,469 312 — 31,781 Operating costs and expenses: Products 15,883 103 — 15,986 Services 9,471 92 — 9,563 G&A 1,937 — — 1,937 27,291 195 — 27,486 Operating earnings 4,178 117 — 4,295 Interest, net (83 ) — — (83 ) Other, net 7 — — 7 Earnings from continuing operations before income tax 4,102 117 — 4,219 Provision for income tax, net 1,137 46 — 1,183 Earnings from continuing operations 2,965 71 — 3,036 Discontinued operations, net of tax benefit of $7 — — — — Net earnings $ 2,965 $ 71 $ — $ 3,036 Earnings per share Basic: Continuing operations $ 9.23 $ 0.22 $ — $ 9.45 Discontinued operations — — — — Net earnings $ 9.23 $ 0.22 $ — $ 9.45 Diluted: Continuing operations $ 9.08 $ 0.21 $ — $ 9.29 Discontinued operations — — — — Net earnings $ 9.08 $ 0.21 $ — $ 9.29 CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Year Ended Effect of the Adoption of Year Ended December 31, 2016 ASC ASU December 31, 2016 (Dollars in millions) As Reported Topic 606 2015-17 As Adjusted Net earnings $ 2,955 $ (383 ) $ — $ 2,572 Gains on cash flow hedges 191 — — 191 Unrealized losses on securities (9 ) — — (9 ) Foreign currency translation adjustments (118 ) 6 — (112 ) Change in retirement plans’ funded status (192 ) — — (192 ) Other comprehensive loss, pretax (128 ) 6 — (122 ) Benefit for income tax, net (18 ) — — (18 ) Other comprehensive loss, net of tax (110 ) 6 — (104 ) Comprehensive income $ 2,845 $ (377 ) $ — $ 2,468 Year Ended Effect of the Adoption of Year Ended December 31, 2015 ASC ASU December 31, 2015 (Dollars in millions) As Reported Topic 606 2015-17 As Adjusted Net earnings $ 2,965 $ 71 $ — $ 3,036 Losses on cash flow hedges (394 ) — — (394 ) Unrealized losses on securities (2 ) — — (2 ) Foreign currency translation adjustments (374 ) 3 — (371 ) Change in retirement plans’ funded status 500 — — 500 Other comprehensive loss, pretax (270 ) 3 — (267 ) Provision for income tax, net 84 — — 84 Other comprehensive loss, net of tax (354 ) 3 — (351 ) Comprehensive income $ 2,611 $ 74 $ — $ 2,685 CONSOLIDATED BALANCE SHEET Effect of the Adoption of December 31, 2016 ASC ASU December 31, 2016 (Dollars in millions) As Reported Topic 606 2015-17* As Adjusted ASSETS Current assets: Cash and equivalents $ 2,334 $ — $ — $ 2,334 Accounts receivable 3,611 (212 ) — 3,399 Unbilled receivables 5,282 (1,070 ) — 4,212 Inventories 3,523 1,595 — 5,118 Other current assets 697 789 (15 ) 1,471 Total current assets 15,447 1,102 (15 ) 16,534 Noncurrent assets: PP&E, net 3,467 10 — 3,477 Intangible assets, net 678 — — 678 Goodwill 11,445 — — 11,445 Other assets 1,835 — (797 ) 1,038 Total noncurrent assets 17,425 10 (797 ) 16,638 Total assets $ 32,872 $ 1,112 $ (812 ) $ 33,172 LIABILITIES AND SHAREHOLDERS’ EQUITY Current liabilities: Short-term debt and current portion of long-term debt $ 900 $ — $ — $ 900 Accounts payable 2,538 — — 2,538 Customer advances and deposits 4,939 1,888 — 6,827 Other current liabilities 4,469 (361 ) (923 ) 3,185 Total current liabilities 12,846 1,527 (923 ) 13,450 Noncurrent liabilities: Long-term debt 2,988 — — 2,988 Other liabilities 6,062 260 111 6,433 Commitments and contingencies Total noncurrent liabilities 9,050 260 111 9,421 Shareholders’ equity: Common stock 482 — — 482 Surplus 2,819 — — 2,819 Retained earnings 25,227 (684 ) — 24,543 Treasury stock (14,156 ) — — (14,156 ) Accumulated other comprehensive loss (3,396 ) 9 — (3,387 ) Total shareholders’ equity 10,976 (675 ) — 10,301 Total liabilities and shareholders’ equity $ 32,872 $ 1,112 $ (812 ) $ 33,172 * The effect of the adoption of ASU 2015-17 includes the reclassification of current deferred tax assets and liabilities of $10 and $335 , respectively, which represents the impact to current deferred taxes of adopting ASC Topic 606. CONSOLIDATED STATEMENT OF CASH FLOWS Year Ended Effect of the Adoption of Year Ended December 31, 2016 ASC ASU December 31, 2016 (Dollars in millions) As Reported Topic 606 2015-17 As Adjusted Cash flows from operating activities - continuing operations: Net earnings $ 2,955 $ (383 ) $ — $ 2,572 Adjustments to reconcile net earnings to net cash provided by operating activities: Depreciation of PP&E 366 (1 ) — 365 Amortization of intangible assets 88 — — 88 Equity-based compensation expense 95 — — 95 Deferred income tax provision 376 (192 ) — 184 Discontinued operations, net of tax 107 — — 107 (Increase) decrease in assets, net of effects of business acquisitions: Accounts receivable (161 ) 39 — (122 ) Unbilled receivables (1,033 ) (15 ) — (1,048 ) Inventories (154 ) (223 ) — (377 ) Other current assets 55 260 — 315 Increase (decrease) in liabilities, net of effects of business acquisitions: Accounts payable 567 — — 567 Customer advances and deposits (825 ) 520 — (305 ) Other, net (238 ) (5 ) — (243 ) Net cash provided by operating activities 2,198 — — 2,198 Cash flows from investing activities: Capital expenditures (392 ) — — (392 ) Business acquisitions, net of cash acquired (58 ) — — (58 ) Proceeds from sales of assets 9 — — 9 Other, net 15 — — 15 Net cash used by investing activities (426 ) — — (426 ) Cash flows from financing activities: Purchases of common stock (1,996 ) — — (1,996 ) Proceeds from fixed-rate notes 992 — — 992 Dividends paid (911 ) — — (911 ) Repayment of fixed-rate notes (500 ) — — (500 ) Proceeds from stock option exercises 292 — — 292 Other, net (46 ) — — (46 ) Net cash used by financing activities (2,169 ) — — (2,169 ) Net cash used by discontinued operations (54 ) — — (54 ) Net decrease in cash and equivalents (451 ) — — (451 ) Cash and equivalents at beginning of year 2,785 — — 2,785 Cash and equivalents at end of year $ 2,334 $ — $ — $ 2,334 CONSOLIDATED STATEMENT OF CASH FLOWS Year Ended Effect of the Adoption of Year Ended December 31, 2015 ASC ASU December 31, 2015 (Dollars in millions) As Reported Topic 606 2015-17 As Adjusted Cash flows from operating activities - continuing operations: Net earnings $ 2,965 $ 71 $ — $ 3,036 Adjustments to reconcile net earnings to net cash provided by operating activities: Depreciation of PP&E 366 (1 ) — 365 Amortization of intangible assets 116 — — 116 Equity-based compensation expense 98 — — 98 Deferred income tax provision 167 46 — 213 (Increase) decrease in assets, net of effects of business acquisitions: Accounts receivable 604 28 — 632 Unbilled receivables 231 (170 ) — 61 Inventories (156 ) 297 — 141 Other current assets (38 ) 118 — 80 Increase (decrease) in liabilities, net of effects of business acquisitions: Accounts payable (89 ) — — (89 ) Customer advances and deposits (1,756 ) (397 ) — (2,153 ) Other, net 99 8 — 107 Net cash provided by operating activities 2,607 — — 2,607 Cash flows from investing activities: Capital expenditures (569 ) — — (569 ) Maturities of held-to-maturity securities 500 — — 500 Proceeds from sales of assets 291 — — 291 Business acquisitions, net of cash acquired (5 ) — — (5 ) Other, net (17 ) — — (17 ) Net cash provided by investing activities 200 — — 200 Cash flows from financing activities: Purchases of common stock (3,233 ) — — (3,233 ) Dividends paid (873 ) — — (873 ) Repayment of fixed-rate notes (500 ) — — (500 ) Proceeds from stock option exercises 268 — — 268 Other, net (29 ) — — (29 ) Net cash used by financing activities (4,367 ) — — (4,367 ) Net cash used by discontinued operations (43 ) — — (43 ) Net decrease in cash and equivalents (1,603 ) — — (1,603 ) Cash and equivalents at beginning of year 4,388 — — 4,388 Cash and equivalents at end of year $ 2,785 $ — $ — $ 2,785 CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY Common Stock Retained Treasury Accumulated Other Comprehensive Total Shareholders’ (Dollars in millions) Par Surplus Earnings Stock Loss Equity December 31, 2014 - as reported $ 482 $ 2,548 $ 21,127 $ (9,396 ) $ (2,932 ) $ 11,829 Cumulative-effect adjustment of ASC Topic 606 on January 1, 2015 — — (372 ) — — (372 ) December 31, 2014 - as adjusted $ 482 $ 2,548 $ 20,755 $ (9,396 ) $ (2,932 ) $ 11,457 Year ended December 31, 2015 - as reported — 182 2,077 (2,996 ) (354 ) (1,091 ) Effect of the adoption of ASC Topic 606 — — 71 — 3 74 Effect of the adoption of ASU 2015-17 — — — — — — December 31, 2015 - as adjusted $ 482 $ 2,730 $ 22,903 $ (12,392 ) $ (3,283 ) $ 10,440 Year ended December 31, 2016 - as reported — 89 2,023 (1,764 ) (110 ) 238 Effect of the adoption of ASC Topic 606 — — (383 ) — 6 (377 ) Effect of the adoption of ASU 2015-17 — — — — — — December 31, 2016 - as adjusted $ 482 $ 2,819 $ 24,543 $ (14,156 ) $ (3,387 ) $ 10,301

Summary Of Significant Accoun48

Summary Of Significant Accounting Policies (Net Interest) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Interest expense	$ 117	$ 99	$ 98
Interest income	(14)	(8)	(15)
Interest expense, net	$ 103	$ 91	$ 83

Summary Of Significant Accoun49

Summary Of Significant Accounting Policies (Narrative) (Details)	5 Months Ended	12 Months Ended
	Jul. 01, 2018USD ($)$ / shares	Dec. 31, 2017USD ($)Segment	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Jan. 01, 2017USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of business groups | Segment		4
Loss to related to discontinued operations			$ 10,000,000
Trading securities		$ 0	0
Other contract costs		448,000,000	699,000,000
Income tax benefit		(1,165,000,000)	(977,000,000)	$ (1,183,000,000)
New accounting pronouncement, decrease to retained earnings		3,000,000
Subsequent Event | Scenario, Forecast | CSRA
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Business acquisition, transaction value	$ 9,600,000,000
Business acquisition, debt assumed	$ 2,800,000,000
Subsequent Event | Scenario, Forecast | CSRA | Common Stock
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Business acquisition, cash price per share (in dollars per share) | $ / shares	$ 40.75
Accounting Standards Update 2016-16
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New accounting pronouncement, decrease to retained earnings					$ 3,000,000
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2017-07 | Operating Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New accounting pronouncement, effect of adoption, increase (decrease) due to reclassifications		59,000,000
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2017-07 | Other Income
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New accounting pronouncement, effect of adoption, increase (decrease) due to reclassifications		(59,000,000)
Company-sponsored R & D, including product development costs
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Research and development expense		$ 521,000,000	418,000,000	$ 395,000,000
Termination Of A - 12 Program
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loss to related to discontinued operations			84,000,000
Sale of Axle Business | Discontinued Operations, Disposed of by Sale
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Final adjustment to the loss on sale of axle business			$ 13,000,000

Revenue (Additional Information

Revenue (Additional Information) (Details) contract in Thousands, $ in Billions	12 Months Ended
	Dec. 31, 2017USD ($)contract	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Number of active contracts | contract	10
Revenue recognized in contract liability | $	$ 4.3	$ 4.2	$ 6
Transferred over Time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, percentage from products and services transferred to customers	71.00%	72.00%	68.00%
Transferred at Point in Time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, percentage from products and services transferred to customers	29.00%	28.00%	32.00%

Revenue (Remaining Performance

Revenue (Remaining Performance Obligations to be Recognized as Revenue) (Details) $ in Billions	12 Months Ended
	Dec. 31, 2017USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-01-01
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, remaining performance obligation	$ 63.2
Revenue, remaining performance obligation, percentage recognized	40.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, remaining performance obligation, percentage recognized	40.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period	2 years

Revenue (Impact of Adjustments

Revenue (Impact of Adjustments in Contract Estimates) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	$ 21,845	$ 25,543
Operating earnings	$ 4,177	$ 3,734	$ 4,295
Diluted earnings per share	$ 9.56	$ 8.29	$ 9.29
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	$ 292	$ 95	$ 356
Operating earnings	$ 323	$ 16	$ 271
Diluted earnings per share	$ 0.69	$ 0.03	$ 0.54

Revenue (Revenue by Product Lin

Revenue (Revenue by Product Line) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue from External Customer [Line Items]
Revenue	$ 30,973	$ 30,561	$ 31,781
Aerospace
Revenue from External Customer [Line Items]
Revenue	8,129	7,815	9,177
Aerospace | Aircraft Manufacturing, Outfitting and Completions
Revenue from External Customer [Line Items]
Revenue	6,320	6,074	7,497
Aerospace | Aircraft Services
Revenue from External Customer [Line Items]
Revenue	1,743	1,625	1,569
Aerospace | Pre-Owned Aircraft
Revenue from External Customer [Line Items]
Revenue	66	116	111
Combat Systems
Revenue from External Customer [Line Items]
Revenue	5,949	5,530	5,643
Combat Systems | Wheeled Combat Vehicles
Revenue from External Customer [Line Items]
Revenue	2,506	2,444	2,597
Combat Systems | Weapons Systems and Munitions
Revenue from External Customer [Line Items]
Revenue	1,633	1,517	1,508
Combat Systems | Tanks and Tracked Vehicles
Revenue from External Customer [Line Items]
Revenue	1,225	934	805
Combat Systems | Engineering and Other Services
Revenue from External Customer [Line Items]
Revenue	585	635	733
Information Systems and Technology
Revenue from External Customer [Line Items]
Revenue	8,891	9,144	8,929
Information Systems and Technology | C4ISR Solutions
Revenue from External Customer [Line Items]
Revenue	4,481	4,716	4,419
Information Systems and Technology | Information Technology Services
Revenue from External Customer [Line Items]
Revenue	4,410	4,428	4,510
Marine Systems
Revenue from External Customer [Line Items]
Revenue	8,004	8,072	8,032
Marine Systems | Nuclear - Powered Submarines
Revenue from External Customer [Line Items]
Revenue	5,175	5,264	5,010
Marine Systems | Surface Combatants
Revenue from External Customer [Line Items]
Revenue	1,043	994	1,081
Marine Systems | Auxiliary and Commercial Ships
Revenue from External Customer [Line Items]
Revenue	564	654	672
Marine Systems | Repair and Other Services
Revenue from External Customer [Line Items]
Revenue	$ 1,222	$ 1,160	$ 1,269

Revenue (Revenue by Contract Ty

Revenue (Revenue by Contract Type) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue, Major Customer [Line Items]
Revenue	$ 30,973	$ 30,561	$ 31,781
Reimbursement Revenue	8,152	8,153	7,552
Aerospace
Revenue, Major Customer [Line Items]
Revenue	8,129	7,815	9,177
Reimbursement Revenue	0	0	0
Combat Systems
Revenue, Major Customer [Line Items]
Revenue	5,949	5,530	5,643
Reimbursement Revenue	823	865	838
Information Systems and Technology
Revenue, Major Customer [Line Items]
Revenue	8,891	9,144	8,929
Reimbursement Revenue	4,143	4,084	4,029
Marine Systems
Revenue, Major Customer [Line Items]
Revenue	8,004	8,072	8,032
Reimbursement Revenue	3,186	3,204	2,685
Fixed-price Contract [Member]
Revenue, Major Customer [Line Items]
Revenue	21,320	20,945	22,759
Fixed-price Contract [Member] | Aerospace
Revenue, Major Customer [Line Items]
Revenue	7,479	7,208	8,583
Fixed-price Contract [Member] | Combat Systems
Revenue, Major Customer [Line Items]
Revenue	5,090	4,629	4,776
Fixed-price Contract [Member] | Information Systems and Technology
Revenue, Major Customer [Line Items]
Revenue	3,943	4,251	4,066
Fixed-price Contract [Member] | Marine Systems
Revenue, Major Customer [Line Items]
Revenue	4,808	4,857	5,334
Time-and-materials Contract [Member]
Revenue, Major Customer [Line Items]
Revenue	1,501	1,463	1,470
Time-and-materials Contract [Member] | Aerospace
Revenue, Major Customer [Line Items]
Revenue	650	607	594
Time-and-materials Contract [Member] | Combat Systems
Revenue, Major Customer [Line Items]
Revenue	36	36	29
Time-and-materials Contract [Member] | Information Systems and Technology
Revenue, Major Customer [Line Items]
Revenue	805	809	834
Time-and-materials Contract [Member] | Marine Systems
Revenue, Major Customer [Line Items]
Revenue	$ 10	$ 11	$ 13

Revenue (Revenue by Customer) (

Revenue (Revenue by Customer) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue, Major Customer [Line Items]
Revenue	$ 30,973	$ 30,561	$ 31,781
U.S. Government - Department of Defense
Revenue, Major Customer [Line Items]
Revenue	15,498	15,139	14,694
U.S. Government - Non Department of Defense
Revenue, Major Customer [Line Items]
Revenue	2,847	2,824	2,831
U.S. Government - Foreign Military Sales
Revenue, Major Customer [Line Items]
Revenue	676	713	453
U.S. Government
Revenue, Major Customer [Line Items]
Revenue	19,021	18,676	17,978
U.S. Commercial
Revenue, Major Customer [Line Items]
Revenue	4,498	4,484	5,502
Non-U.S. Government
Revenue, Major Customer [Line Items]
Revenue	3,413	3,663	3,860
Non-U.S. Commercial
Revenue, Major Customer [Line Items]
Revenue	4,041	3,738	4,441
Aerospace
Revenue, Major Customer [Line Items]
Revenue	8,129	7,815	9,177
Aerospace | U.S. Government - Department of Defense
Revenue, Major Customer [Line Items]
Revenue	189	231	98
Aerospace | U.S. Government - Non Department of Defense
Revenue, Major Customer [Line Items]
Revenue	0	0	0
Aerospace | U.S. Government - Foreign Military Sales
Revenue, Major Customer [Line Items]
Revenue	42	130	6
Aerospace | U.S. Government
Revenue, Major Customer [Line Items]
Revenue	231	361	104
Aerospace | U.S. Commercial
Revenue, Major Customer [Line Items]
Revenue	3,885	3,501	4,334
Aerospace | Non-U.S. Government
Revenue, Major Customer [Line Items]
Revenue	210	496	560
Aerospace | Non-U.S. Commercial
Revenue, Major Customer [Line Items]
Revenue	3,803	3,457	4,179
Combat Systems
Revenue, Major Customer [Line Items]
Revenue	5,949	5,530	5,643
Combat Systems | U.S. Government - Department of Defense
Revenue, Major Customer [Line Items]
Revenue	2,618	2,200	2,225
Combat Systems | U.S. Government - Non Department of Defense
Revenue, Major Customer [Line Items]
Revenue	92	81	83
Combat Systems | U.S. Government - Foreign Military Sales
Revenue, Major Customer [Line Items]
Revenue	374	333	282
Combat Systems | U.S. Government
Revenue, Major Customer [Line Items]
Revenue	3,084	2,614	2,590
Combat Systems | U.S. Commercial
Revenue, Major Customer [Line Items]
Revenue	220	287	242
Combat Systems | Non-U.S. Government
Revenue, Major Customer [Line Items]
Revenue	2,580	2,520	2,714
Combat Systems | Non-U.S. Commercial
Revenue, Major Customer [Line Items]
Revenue	65	109	97
Information Systems and Technology
Revenue, Major Customer [Line Items]
Revenue	8,891	9,144	8,929
Information Systems and Technology | U.S. Government - Department of Defense
Revenue, Major Customer [Line Items]
Revenue	4,970	5,201	5,047
Information Systems and Technology | U.S. Government - Non Department of Defense
Revenue, Major Customer [Line Items]
Revenue	2,755	2,735	2,736
Information Systems and Technology | U.S. Government - Foreign Military Sales
Revenue, Major Customer [Line Items]
Revenue	68	48	38
Information Systems and Technology | U.S. Government
Revenue, Major Customer [Line Items]
Revenue	7,793	7,984	7,821
Information Systems and Technology | U.S. Commercial
Revenue, Major Customer [Line Items]
Revenue	322	367	385
Information Systems and Technology | Non-U.S. Government
Revenue, Major Customer [Line Items]
Revenue	610	621	558
Information Systems and Technology | Non-U.S. Commercial
Revenue, Major Customer [Line Items]
Revenue	166	172	165
Marine Systems
Revenue, Major Customer [Line Items]
Revenue	8,004	8,072	8,032
Marine Systems | U.S. Government - Department of Defense
Revenue, Major Customer [Line Items]
Revenue	7,721	7,507	7,324
Marine Systems | U.S. Government - Non Department of Defense
Revenue, Major Customer [Line Items]
Revenue	0	8	12
Marine Systems | U.S. Government - Foreign Military Sales
Revenue, Major Customer [Line Items]
Revenue	192	202	127
Marine Systems | U.S. Government
Revenue, Major Customer [Line Items]
Revenue	7,913	7,717	7,463
Marine Systems | U.S. Commercial
Revenue, Major Customer [Line Items]
Revenue	71	329	541
Marine Systems | Non-U.S. Government
Revenue, Major Customer [Line Items]
Revenue	13	26	28
Marine Systems | Non-U.S. Commercial
Revenue, Major Customer [Line Items]
Revenue	$ 7	$ 0	$ 0

Acquisitions, Goodwill and In56

Acquisitions, Goodwill and Intangible Assets (Changes In Amount Of Goodwill) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Goodwill, beginning of period	[1]	$ 11,445	$ 11,443
Acquisitions/divestitures	[2]		31
Acquisitions	[2]	297
Other	[3]	172	(29)
Goodwill, end of period	[1]	11,914	11,445
Aerospace
Goodwill [Roll Forward]
Goodwill, beginning of period	[1]	2,537	2,542
Acquisitions/divestitures	[2]		29
Acquisitions	[2]	28
Other	[3]	73	(34)
Goodwill, end of period	[1]	2,638	2,537
Combat Systems
Goodwill [Roll Forward]
Goodwill, beginning of period	[1]	2,598	2,591
Acquisitions/divestitures	[2]		0
Acquisitions	[2]	0
Other	[3]	79	7
Goodwill, end of period	[1]	2,677	2,598
Information Systems and Technology
Goodwill [Roll Forward]
Goodwill, beginning of period	[1]	6,013	6,021
Acquisitions/divestitures	[2]		2
Acquisitions	[2]	269
Other	[3]	20	(10)
Goodwill, end of period	[1]	6,302	6,013
Accumulated impairment loss		2,000	2,000	$ 2,000
Marine Systems
Goodwill [Roll Forward]
Goodwill, beginning of period	[1]	297	289
Acquisitions/divestitures	[2]		0
Acquisitions	[2]	0
Other	[3]	0	8
Goodwill, end of period	[1]	$ 297	$ 297
[1]	Goodwill in the Information Systems and Technology reporting unit is net of $2 billion of accumulated impairment losses.
[2]	Includes adjustments during the purchase price allocation period.
[3]	Consists primarily of adjustments for foreign currency translation.

Acquisitions, Goodwill and In57

Acquisitions, Goodwill and Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	[1]	$ 2,441	$ 2,354
Accumulated Amortization		(1,739)	(1,676)
Net Carrying Amount		702	678
Contract and Program Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	[1],[2]	1,684	1,633
Accumulated Amortization	[2]	(1,320)	(1,281)
Net Carrying Amount		364	352
Tradenames and Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	[1]	465	446
Accumulated Amortization		(160)	(139)
Net Carrying Amount		305	307
Technology and Software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	[1]	137	121
Accumulated Amortization		(105)	(102)
Net Carrying Amount		32	19
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	[1]	155	154
Accumulated Amortization		(154)	(154)
Net Carrying Amount		$ 1	$ 0
[1]	Change in gross carrying amounts consists primarily of adjustments for acquired intangible assets and foreign currency translation.
[2]	Consists of acquired backlog and probable follow-on work and associated customer relationships

Acquisitions, Goodwill and In58

Acquisitions, Goodwill and Intangible Assets (Amortization Life) (Details)	12 Months Ended
	Dec. 31, 2017
Contract and Program Intangible Assets | Minimum
Finite-Lived Intangible Assets [Line Items]
Range of Amortization Life	7 years
Contract and Program Intangible Assets | Maximum
Finite-Lived Intangible Assets [Line Items]
Range of Amortization Life	30 years
Tradenames and Trademarks
Finite-Lived Intangible Assets [Line Items]
Range of Amortization Life	30 years
Technology and Software | Minimum
Finite-Lived Intangible Assets [Line Items]
Range of Amortization Life	5 years
Technology and Software | Maximum
Finite-Lived Intangible Assets [Line Items]
Range of Amortization Life	15 years
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Range of Amortization Life	7 years

Acquisitions, Goodwill and In59

Acquisitions, Goodwill and Intangible Assets (Amortization Expense) (Details) $ in Millions	Dec. 31, 2017USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2,018	$ 80
2,019	67
2,020	62
2,021	57
2,022	$ 50

Acquisitions, Goodwill and In60

Acquisitions, Goodwill and Intangible Assets (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)business	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Number of business acquired | business	4
Payments to acquire businesses	$ 399	$ 58
Amortization of intangible assets	$ 79	$ 88	$ 116

Earnings Per Share (Details)

Earnings Per Share (Details) - shares shares in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Basic weighted average shares outstanding (shares)		299,172	304,707	321,313
Dilutive effect of stock options and restricted stock/RSUs (shares)	[1]	5,465	5,680	5,339
Diluted weighted average shares outstanding (shares)		304,637	310,387	326,652
Stock Option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive outstanding options excluded from computation of earnings per share (shares)		1,547	4,201	1,706
[1]	Excludes outstanding options to purchase shares of common stock that had exercise prices in excess of the average market price of our common stock during the year and, therefore, the effect of including these options would be antidilutive. These options totaled 1,547 in 2017, 4,201 in 2016 and 1,706 in 2015.

Fair Value (Details)

Fair Value (Details) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Financial assets (liabilities)
Marketable securities held in trust		$ 191
Long-term debt, including current portion		(3,982)	$ (3,888)
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets (liabilities)
Marketable securities held in trust	[1]	69	59
Derivatives	[1]	0	0
Long-term debt, including current portion	[1]	0	0
Significant Other Observable Inputs (Level 2)
Financial assets (liabilities)
Marketable securities held in trust	[1],[2]	122	118
Derivatives	[1],[2]	(105)	(477)
Long-term debt, including current portion	[1],[2]	(3,974)	(3,849)
Significant Unobservable Inputs (Level 3)
Financial assets (liabilities)
Level 3 financial instruments		0	0
Carrying Value
Financial assets (liabilities)
Marketable securities held in trust	[1]	191	177
Derivatives	[1]	(105)	(477)
Long-term debt, including current portion	[1]	(4,032)	(3,924)
Fair Value
Financial assets (liabilities)
Marketable securities held in trust	[1]	191	177
Derivatives	[1]	(105)	(477)
Long-term debt, including current portion	[1]	$ (3,974)	$ (3,849)
[1]	We had no Level 3 financial instruments on December 31, 2017 or 2016.
[2]	Determined under a market approach using valuation models that incorporate observable inputs such as interest rates, bond yields and quoted prices for similar assets and liabilities.

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Unfavorable impact in tax provision from change in tax law	$ 119	$ 0	$ 0
Deferred tax asset amount related to accumulated other comprehensive income	1,000	1,700
Investment of U.S. government accounts receivable in the CCF	692	$ 388
Net operating loss carryforwards	1,000
Capital loss carryforwards	234
Tax credit carryforwards	$ 123
Possible chance of tax position sustainable, percentage	50.00%
Tax positions for which it is reasonably possible that the unrecognized tax benefits will significantly increase or decrease	$ 0

Income Taxes (Net Provision For

Income Taxes (Net Provision For Income Taxes For Continuing Operations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
U.S. federal	$ 656	$ 698	$ 841
State	31	24	31
International	77	71	98
Total current	764	793	970
Deferred:
U.S. federal	215	140	163
State	7	7	7
International	60	37	43
Adjustment for enacted change in U.S. tax law	119	0	0
Total deferred	401	184	213
Provision for income taxes, net	1,165	977	1,183
Net income tax payments	$ 617	$ 959	$ 871

Income Taxes (Reconciliation Fr

Income Taxes (Reconciliation From Statutory Federal Income Tax Rate To Effective Income Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	35.00%	35.00%	35.00%
State tax on commercial operations, net of federal benefits	0.60%	0.60%	0.50%
Impact of international operations	(4.50%)	(4.00%)	(1.30%)
Domestic production deduction	(1.50%)	(1.50%)	(1.60%)
Equity-based compensation	(2.60%)	(2.30%)	0.00%
Domestic tax credits	(0.80%)	(0.90%)	(1.10%)
Contract close-outs	0.00%	0.00%	(2.80%)
Impact of change in U.S. tax law	2.90%	0.00%	0.00%
Other, net	(0.50%)	(0.20%)	(0.70%)
Effective income tax rate	28.60%	26.70%	28.00%

Income Taxes (Tax Effects Of Te

Income Taxes (Tax Effects Of Temporary Differences Between Reported Earnings And Taxable Earnings) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Retirement benefits	$ 935	$ 1,461
Tax loss and credit carryforwards	437	480
Salaries and wages	137	257
Workers' compensation	139	235
Other	335	396
Deferred assets	1,983	2,829
Valuation allowance	(402)	(406)
Net deferred assets	1,581	2,423
Intangible assets	(688)	(1,049)
Contract accounting methods	(500)	(188)
Property, plant and equipment	(182)	(320)
Capital Construction Fund qualified ships	(159)	(240)
Other	(221)	(245)
Deferred liabilities	(1,750)	(2,042)
Net deferred tax liabilities	$ (169)
Net deferred tax asset		$ 381

Income Taxes (Net Deferred Tax

Income Taxes (Net Deferred Tax Asset (Liability)) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Noncurrent deferred tax asset	$ 75	$ 564
Noncurrent deferred tax liability	(244)	(183)
Net deferred tax liabilities	$ (169)
Net deferred tax asset		$ 381

Accounts Receivable (Details)

Accounts Receivable (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Accounts Receivable [Line Items]
Total accounts receivable	$ 3,617	$ 3,399
Non-U.S. Government
Accounts Receivable [Line Items]
Total accounts receivable	2,228	2,147
Receivables related to long-term production programs	2,100
Receivables related to long-term production programs, net of customer advances	284
U.S. Government
Accounts Receivable [Line Items]
Total accounts receivable	971	793
Commercial
Accounts Receivable [Line Items]
Total accounts receivable	$ 418	$ 459

Unbilled Receivables (Cost Of C

Unbilled Receivables (Cost Of Contracts) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Contractors [Abstract]
Unbilled revenue	$ 21,845	$ 25,543
Advances and progress billings	(16,605)	(21,331)
Net unbilled receivables	$ 5,240	$ 4,212

Unbilled Receivables (Narrative

Unbilled Receivables (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Contractors [Abstract]
G&A costs in unbilled revenue	$ 282	$ 234
Percent of net unbilled receivables not expected to be billed in 2018	20.00%

Inventory (Details)

Inventory (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Work in process	$ 3,872	$ 3,643
Raw materials	1,357	1,429
Finished goods	51	24
Pre-owned aircraft	23	22
Total inventories	$ 5,303	$ 5,118

Property, Plant And Equipment72

Property, Plant And Equipment, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Machinery and equipment	$ 4,736	$ 4,582
Buildings and improvements	2,837	2,745
Land and improvements	357	333
Construction in process	307	269
Total property, plant and equipment	8,237	7,929
Accumulated depreciation	(4,720)	(4,452)
Property, plant and equipment, net	$ 3,517	$ 3,477
Buildings And Improvements
Property, Plant and Equipment [Line Items]
Depreciable life, maximum, years	50 years
Machinery And Equipment
Property, Plant and Equipment [Line Items]
Depreciable life, maximum, years	30 years

Debt (Details)

Debt (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt - principal	$ 4,032	$ 3,924
Less unamortized debt issuance costs and discounts	50	36
Total debt	3,982	3,888
Short-term debt and current portion of long-term debt	2	900
Long-term debt	3,980	2,988
Fixed-Rate Notes Due November 2017
Debt Instrument [Line Items]
Long-term debt - principal	$ 0	900
Interest rate	1.00%
Fixed-Rate Notes Due July 2021
Debt Instrument [Line Items]
Long-term debt - principal	$ 500	500
Interest rate	3.875%
Fixed-Rate Notes Due November 2022
Debt Instrument [Line Items]
Long-term debt - principal	$ 1,000	1,000
Interest rate	2.25%
Fixed-Rate Notes Due August 2023
Debt Instrument [Line Items]
Long-term debt - principal	$ 500	500
Interest rate	1.875%
Fixed Rate Notes Due November 2024
Debt Instrument [Line Items]
Long-term debt - principal	$ 500	0
Interest rate	2.375%
Fixed-Rate Notes Due August 2026
Debt Instrument [Line Items]
Long-term debt - principal	$ 500	500
Interest rate	2.125%
Fixed Rate Notes Due November 2027
Debt Instrument [Line Items]
Long-term debt - principal	$ 500	0
Interest rate	2.625%
Fixed-Rate Notes Due November 2042
Debt Instrument [Line Items]
Long-term debt - principal	$ 500	500
Interest rate	3.60%
Other Debt Securities
Debt Instrument [Line Items]
Long-term debt - principal	$ 32	$ 24
Other interest rate	Various

Debt (Narrative) (Details)

Debt (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Outstanding [Line Items]
Repayments of fixed-rate notes	$ 900,000,000	$ 500,000,000	$ 500,000,000
Interest Paid	$ 93,000,000	83,000,000	$ 90,000,000
Percentage of owned subsidiaries guaranteed	100.00%
Commercial paper	$ 0
Long-term debt - principal	$ 4,032,000,000	3,924,000,000
Multi Year Facility Expiring July 2018
Debt Outstanding [Line Items]
Expiration dates	2018-07
Multi-Year Facility Expiring November 2020
Debt Outstanding [Line Items]
Expiration dates	2020-11
Commercial Paper
Debt Outstanding [Line Items]
Percentage of owned subsidiaries guaranteed	100.00%
Credit facilities	$ 2,000,000,000
Commercial Paper | Multi Year Facility Expiring July 2018
Debt Outstanding [Line Items]
Credit facilities	1,000,000,000
Commercial Paper | Multi-Year Facility Expiring November 2020
Debt Outstanding [Line Items]
Credit facilities	1,000,000,000
Fixed Rate Notes [Member] | Fixed-Rate Notes
Debt Outstanding [Line Items]
Fixed-rate notes issued	1,000,000,000
Repayments of fixed-rate notes	900,000,000
Fixed-Rate Notes Due November 2017
Debt Outstanding [Line Items]
Long-term debt - principal	$ 0	$ 900,000,000

Debt Debt (Aggregate Amounts Of

Debt Debt (Aggregate Amounts Of Scheduled Maturities Of Debt For The Next Five Years) (Details) $ in Millions	Dec. 31, 2017USD ($)
Debt Disclosure [Abstract]
2,018	$ 2
2,019	3
2,020	3
2,021	503
2,022	1,003
Thereafter	2,518
Total debt	$ 4,032

Other Liabilities (Details)

Other Liabilities (Details) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Other Liabilities Disclosure [Abstract]
Salaries and wages		$ 786	$ 693
Fair value of cash flow hedges		180	521
Workers' compensation		320	337
Retirement benefits		295	303
Other	[1]	1,317	1,331
Total other current liabilities		2,898	3,185
Retirement benefits		4,408	4,393
Customer deposits on commercial contracts		814	719
Deferred income taxes		244	183
Other	[2]	1,066	1,138
Total other liabilities		$ 6,532	$ 6,433
[1]	Consists primarily of dividends payable, taxes payable, environmental remediation reserves, warranty reserves, deferred revenue and supplier contributions in the Aerospace group, liabilities of discontinued operations, and insurance-related costs.
[2]	Consists primarily of warranty reserves, workers’ compensation liabilities and liabilities of discontinued operations.

Shareholders' Equity - (Narrati

Shareholders' Equity - (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Mar. 01, 2017
Class of Stock [Line Items]
Authorized capital stock, common stock (shares)	500,000,000
Common stock, par value	$ 1
Authorized capital stock, preferred stock (shares)	50,000,000
Preferred stock, par value	$ 1
Common stock, issued (shares)	481,880,634	481,880,634
Common stock, outstanding (shares)	296,895,608	302,418,528
Preferred stock, outstanding (shares)	0	0
Share repurchased, additional amount authorized (shares)				10,000,000
Stock repurchased (shares)	7,800,000	14,200,000	22,800,000
Shares repurchased	$ 1,533	$ 2,031	$ 3,233
Shares remaining under a prior authorization	7,600,000
Percent of total shares outstanding authorized for repurchase	3.00%
Dividends declared per share	$ 3.36	$ 3.04	$ 2.76
Dividends paid	$ 986	$ 911	$ 873
Pretax recognized actuarial losses	358	340	423
Pretax amortization of prior service credit	$ 69	$ 74	$ 72
Restricted Stock
Class of Stock [Line Items]
Unvested restricted stock (shares)	817,484

Shareholders' Equity - (Accumul

Shareholders' Equity - (Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ (3,387)	$ (3,283)	$ (2,932)
Other comprehensive income, pretax	718	(122)	(267)
(Benefit) provision for income tax, net	151	(18)	84
Other comprehensive (loss) income, net amount	567	(104)	(351)
Ending balance	(2,820)	(3,387)	(3,283)
Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(345)	(487)	(173)
Other comprehensive income, pretax	341	191	(394)
(Benefit) provision for income tax, net	90	49	(80)
Other comprehensive (loss) income, net amount	251	142	(314)
Ending balance	(94)	(345)	(487)
Unrealized Gains (Losses) On Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	14	20	22
Other comprehensive income, pretax	9	(9)	(2)
(Benefit) provision for income tax, net	4	(3)	0
Other comprehensive (loss) income, net amount	5	(6)	(2)
Ending balance	19	14	20
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	69	181	541
Other comprehensive income, pretax	348	(112)	(371)
(Benefit) provision for income tax, net	15	0	(11)
Other comprehensive (loss) income, net amount	333	(112)	(360)
Ending balance	402	69	181
Changes In Retirement Plans' Funded Status
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(3,125)	(2,997)	(3,322)
Other comprehensive income, pretax	20	(192)	500
(Benefit) provision for income tax, net	42	(64)	175
Other comprehensive (loss) income, net amount	(22)	(128)	325
Ending balance	$ (3,147)	$ (3,125)	$ (2,997)

Derivative Instruments And He79

Derivative Instruments And Hedging Activities Derivative Instruments And Hedging Activities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Average maturity of foreign currency forward contracts, in years	3 years
Derivative financial instruments designated as fair value hedges	$ 0	$ 0
Derivative financial instruments designated as net investment hedges	0	0
Cash and equivalents	2,983	2,334	$ 2,785	$ 4,388
Marketable securities	$ 191
Maximum
Derivative Instruments, Gain (Loss) [Line Items]
Maturity of fixed-income securities, in years	5 years
Forward Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	$ 4,300	$ 6,300

Commitments And Contingencies80

Commitments And Contingencies (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)agreementemployee	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Commitments and Contingencies [Line Items]
Total expense under operating leases | $	$ 309	$ 307	$ 283
Letters of credit | $	$ 1,200
Number of company-negotiated labor agreements | agreement	47
Number of collective agreements expected to be renegotiated | agreement	15
Number of employees covered by expected renegotiated collective agreements | employee	2,000
Maximum
Commitments and Contingencies [Line Items]
Period preceding delivery of aircraft to customer fair market value of trade-in aircraft is established, days, maximum	45 days
Unionized Employees Concentration Risk
Commitments and Contingencies [Line Items]
Percent of employees represented by labor organizations	20.00%

Commitments And Contingencies81

Commitments And Contingencies (Schedule of Future Minimum Lease Payments Due) (Details) $ in Millions	Dec. 31, 2017USD ($)
Commitments and Contingencies Disclosure [Abstract]
2,018	$ 258
2,019	215
2,020	148
2,021	118
2,022	94
Thereafter	526
Total minimum lease payments	$ 1,359

Commitments And Contingencies82

Commitments And Contingencies (Product Guarantee) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Beginning balance		$ 474	$ 434	$ 428
Warranty expense		146	155	162
Payments		(123)	(100)	(120)
Adjustments	[1]	(30)	(15)	(36)
Ending balance		$ 467	$ 474	$ 434
[1]	Includes a cumulative-effect adjustment on January 1, 2015, which represents the impact of adopting ASC Topic 606.

Equity Compensation Plans (Narr

Equity Compensation Plans (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Number of shares available for grant (shares)	6
Weighted average fair value per option granted	$ 33.09	$ 22.11	$ 27.54
Stock option expense reduced operating earnings	$ 53	$ 39	$ 49
Stock option expense earnings per share	$ 0.11	$ 0.08	$ 0.10
Total intrinsic value of options exercised	$ 215	$ 263	$ 238
Stock Options
Awards vesting period	3 years
Awards expiration period	10 years
Unrecognized compensation cost related to stock options	$ 71
Recognition period for unrecognized compensation cost for restricted stock	1 year 10 months 3 days
Stock Options | Share-based Compensation Award, Vesting In Second Year
Percentage of stock options vesting in a period of one year	50.00%
Stock Options | Share-based Compensation Award, Vesting In Third Year
Percentage of stock options vesting in a period of one year	50.00%
Restricted Stock and Restricted Stock Units (RSUs)
Awards vesting period	3 years
Stock option expense reduced operating earnings	$ 70	$ 56	$ 49
Stock option expense earnings per share	$ 0.15	$ 0.12	$ 0.10
Unrecognized compensation cost related to stock options	$ 47
Recognition period for unrecognized compensation cost for restricted stock	1 year 7 months 5 days
Fair value of vesting shares	$ 200	$ 68	$ 76

Equity Compensation Plans (Sche

Equity Compensation Plans (Schedule Of Equity Based Compensation Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock options	$ 34	$ 25	$ 32
Restricted stock/RSUs	46	36	32
Total equity-based compensation expense, net of tax	$ 80	$ 61	$ 64

Equity Compensation Plans (Sc85

Equity Compensation Plans (Schedule Of Assumption Of Fair Value Options On The Date Of Grant Using Black-Scholes Option Pricing Model) (Details) - Stock Options	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility, minimum	17.30%	19.10%	20.10%
Expected volatility, maximum	19.40%	20.00%	24.10%
Weighted average expected volatility	19.40%	20.00%	24.00%
Expected term (in months)	68 months	70 months	74 months
Risk - free interest rate, minimum	2.00%	1.50%	1.70%
Risk - free interest rate, maximum	2.20%	1.60%	1.90%
Expected dividend yield	1.80%	2.00%	2.00%

Equity Compensation Plans (Summ

Equity Compensation Plans (Summary Of Stock Option Activity) (Details)	12 Months Ended
	Dec. 31, 2017$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding balance - shares under option, beginning | shares	10,934,621
Granted - shares under option | shares	1,870,260
Exercised - shares under option | shares	(2,020,882)
Forfeited/cancelled - shares under option | shares	(163,610)
Outstanding balance - shares under option, ending | shares	10,620,389
Vested and expected to vest on December 31, 2017 - shares under option | shares	10,470,666
Exercisable on December 31, 2017 - shares under option | shares	5,286,882
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding balance - weighted average exercise price, beginning | $ / shares	$ 108.23
Granted - weighted average exercise price | $ / shares	191.84
Exercised - weighted average exercise price | $ / shares	88.75
Forfeited/cancelled - weighted average exercise price | $ / shares	145.72
Outstanding balance - weighted average exercise price, ending | $ / shares	126.08
Vested and expected to vest on December 31, 2017 - weighted average exercise price | $ / shares	125.45
Exercisable on December 31, 2017 - weighted average exercise price | $ / shares	$ 96.52

Equity Compensation Plans (Sc87

Equity Compensation Plans (Schedule Of Stock Options' Intrinsic Value And Remaining Contractual Term) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Outstanding - weighted average remaining contractual term (in years)	5 years 8 months
Vested and expected to vest - weighted average remaining contractual term (in years)	5 years 7 months 20 days
Exercisable - weighted average remaining contractual term (in years)	3 years 30 days
Outstanding - aggregate intrinsic value	$ 822
Vested and expected to vest - aggregate intrinsic value	817
Exercisable - aggregate intrinsic value	$ 565

Equity Compensation Plans (Su88

Equity Compensation Plans (Summary Of Restricted Stock And Restricted Stock Unit Activity) (Details) - Restricted Stock and Restricted Stock Units (RSUs)	12 Months Ended
	Dec. 31, 2017$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested - beginning balance (shares) | shares	2,806,128
Granted (shares) | shares	341,558
Vested (shares) | shares	(1,139,028)
Forfeited (shares) | shares	(25,485)
Nonvested - ending balance (shares) | shares	1,983,173
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested, weighted average grant-date fair value - beginning balance | $ / shares	$ 101.54
Granted, weighted average grant-date fair value | $ / shares	191.83
Vested, weighted average grant-date fair value | $ / shares	67.80
Forfeited, weighted average grant-date fair value | $ / shares	142.37
Nonvested, weighted average grant-date fair value - ending balance | $ / shares	$ 135.38

Retirement Plans (Narrative) (D

Retirement Plans (Narrative) (Details) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)planshares	Dec. 31, 2016USD ($)shares	Dec. 31, 2015USD ($)
Compensation And Retirement Disclosure Line Items
Defined contribution plan, cost recognized	$ 274	$ 261	$ 240
Common stock, shares held in employee trust (shares) | shares	21	22
Percentage of defined contribution plans held from outstanding shares	7.00%	7.00%
Number of noncontributory defined benefit pension plans covering government business employees | plan	7
Number of contributory defined benefit pension plans covering government business employees | plan	5
Number of noncontributory defined benefit pension plans covering commercial business employees | plan	2
Number of contributory defined benefit pension plans covering commercial business employees | plan	4
Number of non-qualified supplemental executive plans | plan	1
Period in which the difference between the actual and expected return on plan assets for qualified plans are recognized in years	5 years
Expected change in long-term rate of return on assets	0.75%
Defined benefit plan, effect of one percentage point increase on service and interest cost components	$ 4
Defined benefit plan, effect of one percentage point decrease on service and interest cost components	(3)
Defined benefit plan, effect of one percentage point increase on accumulated postretirement benefit obligation	75
Defined benefit plan, effect of one percentage point decrease on accumulated postretirement benefit obligation	$ (60)
Percentage of pension plan assets held in a single trust for primary domestic government and commercial pension plans	90.00%
Redemption notice period	90 days
Unfunded commitments, amount	$ 0	$ 0
Pension Benefits
Compensation And Retirement Disclosure Line Items
Employer contributions	199	208
Expected contribution to defined benefit contribution plans	315
Defined benefit plan, accumulated benefit obligation	$ 13,900	$ 12,700
Weighted average expected long-term rate of return	7.43%	8.14%	8.15%
Total pension plan assets	$ 10,130	$ 8,980	$ 8,608
Pension Benefits | Real Estate Funds
Compensation And Retirement Disclosure Line Items
Total pension plan assets	51	42
Other Post-retirement Benefits
Compensation And Retirement Disclosure Line Items
Employer contributions	$ 3	$ 5
Weighted average expected long-term rate of return	7.76%	7.81%	8.03%
Total pension plan assets	$ 541	$ 499	$ 527
Other Post-retirement Benefits | Real Estate Funds
Compensation And Retirement Disclosure Line Items
Total pension plan assets	$ 2	$ 2

Retirement Plans (Schedule Of B

Retirement Plans (Schedule Of Benefits To Be Paid From Retirement Plans Over The Next Ten Years) (Details) $ in Millions	Dec. 31, 2017USD ($)
Pension Benefits
Compensation And Retirement Disclosure Line Items
2,018	$ 626
2,019	648
2,020	676
2,021	704
2,022	730
2023-2027	4,013
Other Post-retirement Benefits
Compensation And Retirement Disclosure Line Items
2,018	64
2,019	64
2,020	63
2,021	63
2,022	62
2023-2027	$ 292

Retirement Plans (Schedule of A

Retirement Plans (Schedule of Annual Pension and Other Post-Retirement Benefit Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 168	$ 173	$ 210
Interest cost	453	456	529
Expected return on plan assets	(679)	(713)	(693)
Recognized net actuarial loss	362	343	417
Amortization of prior service (credit) cost	(66)	(68)	(67)
Annual benefit cost	238	191	396
Other Post-retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	9	10	11
Interest cost	30	34	44
Expected return on plan assets	(34)	(33)	(32)
Recognized net actuarial loss	(4)	(3)	6
Amortization of prior service (credit) cost	(3)	(6)	(5)
Annual benefit cost	$ (2)	$ 2	$ 24

Retirement Plans (Reconciliatio

Retirement Plans (Reconciliation Of Benefit Obligations And Plan Or Trust Assets And Resulting Funded Status Of Defined Benefit Retirement Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Benefits
Change in Benefit Obligation
Benefit obligation at beginning of year	$ (13,022)	$ (12,554)
Service cost	(168)	(173)	$ (210)
Interest cost	(453)	(456)	(529)
Amendments	1	0
Actuarial gain (loss)	(1,098)	(383)
Settlement/curtailment/other	(58)	(4)
Benefits paid	586	548
Benefit obligation at end of year	(14,212)	(13,022)	(12,554)
Change in Plan/Trust Assets
Fair value of assets at beginning of year	8,980	8,608
Actual return on plan assets	1,469	694
Employer contributions	199	208
Settlement/curtailment/other	56	5
Benefits paid	(574)	(535)
Fair value of assets at end of year	10,130	8,980	8,608
Funded status at end of year	(4,082)	(4,042)
Other Post-retirement Benefits
Change in Benefit Obligation
Benefit obligation at beginning of year	(1,005)	(991)
Service cost	(9)	(10)	(11)
Interest cost	(30)	(34)	(44)
Amendments	0	(13)
Actuarial gain (loss)	(42)	(18)
Settlement/curtailment/other	27	(3)
Benefits paid	63	64
Benefit obligation at end of year	(996)	(1,005)	(991)
Change in Plan/Trust Assets
Fair value of assets at beginning of year	499	527
Actual return on plan assets	82	9
Employer contributions	3	5
Settlement/curtailment/other	0	0
Benefits paid	(43)	(42)
Fair value of assets at end of year	541	499	$ 527
Funded status at end of year	$ (455)	$ (506)

Retirement Plans (Amounts Recog

Retirement Plans (Amounts Recognized On The Consolidated Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Current liabilities	$ (295)	$ (303)
Noncurrent liabilities	(4,408)	(4,393)
Pension Benefits
Noncurrent assets	133	138
Current liabilities	(145)	(132)
Noncurrent liabilities	(4,070)	(4,048)
Net liability recognized	(4,082)	(4,042)
Other Post-retirement Benefits
Noncurrent assets	33	10
Current liabilities	(150)	(171)
Noncurrent liabilities	(338)	(345)
Net liability recognized	$ (455)	$ (506)

Retirement Plans (Amounts Defer

Retirement Plans (Amounts Deferred In AOCI) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Pension Benefits
Compensation And Retirement Disclosure Line Items
Net actuarial loss (gain)	$ 4,899	$ 4,947
Prior service credit (gain)	(124)	(190)
Total amount recognized in AOCI, pre-tax	4,775	4,757
Other Post-retirement Benefits
Compensation And Retirement Disclosure Line Items
Net actuarial loss (gain)	(5)	36
Prior service credit (gain)	(3)	(6)
Total amount recognized in AOCI, pre-tax	$ (8)	$ 30

Retirement Plans (Reconciliat95

Retirement Plans (Reconciliation Of The Change In AOCI For Defined-Benefit Retirement Plans) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Amortization of:
Prior service credit (cost)		$ (69)	$ (74)	$ (72)
Change in AOCL, pretax		(20)	192	$ (500)
Pension Benefits
Compensation And Retirement Disclosure Line Items
Net actuarial loss (gain)		308	402
Prior service cost		(1)	0
Amortization of:
Net actuarial loss from prior years		(362)	(343)
Prior service credit (cost)		66	68
Other	[1]	7	1
Change in AOCL, pretax		18	128
Other Post-retirement Benefits
Compensation And Retirement Disclosure Line Items
Net actuarial loss (gain)		(6)	42
Prior service cost		0	13
Amortization of:
Net actuarial loss from prior years		4	3
Prior service credit (cost)		3	6
Other	[1]	(39)	0
Change in AOCL, pretax		$ (38)	$ 64
[1]	Includes foreign exchange translation, curtailment and other adjustments.

Retirement Plans (Amounts Def96

Retirement Plans (Amounts Deferred In AOCI On The Consolidated Balance Sheet) (Details) $ in Millions	Dec. 31, 2017USD ($)
Pension Benefits
Compensation And Retirement Disclosure Line Items
Net actuarial loss (gain)	$ 387
Prior service credit	(44)
Other Post-retirement Benefits
Compensation And Retirement Disclosure Line Items
Net actuarial loss (gain)	(4)
Prior service credit	$ (3)

Retirement Plans (Schedule Of97

Retirement Plans (Schedule Of ABO That Exceeded The Plans' Assets) (Details) - Pension Benefits - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Compensation And Retirement Disclosure Line Items
PBO	$ (13,660)	$ (12,817)
ABO	(13,398)	(12,557)
Fair value of plan assets	$ 9,526	$ 8,722

Retirement Plans (Assumptions U

Retirement Plans (Assumptions Used To Determine Our Benefit Obligations And Net Periodic Benefit Costs) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Benefits
Compensation And Retirement Disclosure Line Items
Benefit obligation discount rate	3.62%	4.19%
Rate of increase in compensation levels	2.82%	2.92%
Healthcare cost trend rate:
Weighted average used to determine net cost for the year ended, Discount rate	4.19%	4.46%	4.10%
Weighted averaged used to determine net cost for the year ended, Discount rate for service cost	4.13%	4.42%
Weighted averaged used to determine net cost for the year ended, Discount rate for interest cost	3.56%	3.71%
Weighted average used to determine net cost for the year ended, expected long-term rate of return on assets	7.43%	8.14%	8.15%
Weighed average rate of increase in compensation levels	2.90%	3.39%	3.43%
Other Post-retirement Benefits
Compensation And Retirement Disclosure Line Items
Benefit obligation discount rate	3.64%	4.11%
Healthcare cost trend rate:
Trend rate for next year	6.50%	6.50%
Ultimate trend rate	5.00%	5.00%
Year rate reaches ultimate trend rate	2,024	2,024
Weighted average used to determine net cost for the year ended, Discount rate	4.11%	4.35%	4.03%
Weighted averaged used to determine net cost for the year ended, Discount rate for service cost	4.34%	4.52%
Weighted averaged used to determine net cost for the year ended, Discount rate for interest cost	3.43%	3.53%
Weighted average used to determine net cost for the year ended, expected long-term rate of return on assets	7.76%	7.81%	8.03%

Retirement Plans (Hypothetical

Retirement Plans (Hypothetical Changes In The Discount Rate And Expected Long-Term Rate Of Return On Plan Assets) (Details) - Pension Benefits $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)
Increase (decrease) to net pension cost from:
Change in discount rate (increase 25 basis points)	$ (28)
Change in discount rate (decrease 25 basis points)	30
Change in discount rate of return on plan assets (increase of 25 basis points)	(21)
Change in long-term rate of return on plan assets (decrease 25 basis points)	$ 21

Retirement Plans (Asset Allocat

Retirement Plans (Asset Allocation Policy Ranges) (Details)	Dec. 31, 2017
Equity Funds | Minimum
Defined Benefit Plan Disclosure [Line Items]
Asset allocation policy range	48.00%
Equity Funds | Maximum
Defined Benefit Plan Disclosure [Line Items]
Asset allocation policy range	68.00%
Fixed Income Funds | Minimum
Defined Benefit Plan Disclosure [Line Items]
Asset allocation policy range	20.00%
Fixed Income Funds | Maximum
Defined Benefit Plan Disclosure [Line Items]
Asset allocation policy range	48.00%
Cash and Cash Equivalents | Minimum
Defined Benefit Plan Disclosure [Line Items]
Asset allocation policy range	0.00%
Cash and Cash Equivalents | Maximum
Defined Benefit Plan Disclosure [Line Items]
Asset allocation policy range	5.00%
Other Asset Classes | Minimum
Defined Benefit Plan Disclosure [Line Items]
Asset allocation policy range	0.00%
Other Asset Classes | Maximum
Defined Benefit Plan Disclosure [Line Items]
Asset allocation policy range	16.00%

Retirement Plans (Fair Value Of

Retirement Plans (Fair Value Of Plan Assets By Investment Category And The Corresponding Level Within The Fair Value Hierarchy) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Compensation And Retirement Disclosure Line Items
Maximum equity holding percentage of total fair value		1.00%	1.00%
Significant Unobservable Inputs (Level 3)
Compensation And Retirement Disclosure Line Items
Total pension plan assets		$ 189	$ 164	$ 157
Significant Unobservable Inputs (Level 3) | Real Estate Funds
Compensation And Retirement Disclosure Line Items
Total pension plan assets		51	42	42
Significant Unobservable Inputs (Level 3) | Insurance Deposit Agreements
Compensation And Retirement Disclosure Line Items
Total pension plan assets		120	109	103
Significant Unobservable Inputs (Level 3) | Private Equity Investments
Compensation And Retirement Disclosure Line Items
Total pension plan assets		18	13	12
Pension Benefits
Compensation And Retirement Disclosure Line Items
Total pension plan assets		10,130	8,980	8,608
Pension plan assets, excluding NAV		9,412	8,301
Pension Benefits | Equity Funds
Compensation And Retirement Disclosure Line Items
Total pension plan assets		5,018	4,285
Pension Benefits | Fixed Income Funds
Compensation And Retirement Disclosure Line Items
Total pension plan assets		325	567
Pension Benefits | Real Estate Funds
Compensation And Retirement Disclosure Line Items
Total pension plan assets		51	42
Pension plan assets, measured using NAV		390	365
Pension Benefits | Hedge Funds
Compensation And Retirement Disclosure Line Items
Pension plan assets, measured using NAV		328	314
Pension Benefits | Insurance Deposit Agreements
Compensation And Retirement Disclosure Line Items
Total pension plan assets		120	109
Pension Benefits | U.S. Companies
Compensation And Retirement Disclosure Line Items
Total pension plan assets	[1]	770	786
Pension Benefits | International Companies
Compensation And Retirement Disclosure Line Items
Total pension plan assets		97	74
Pension Benefits | Private Equity Investments
Compensation And Retirement Disclosure Line Items
Total pension plan assets		18	13
Pension Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1)
Compensation And Retirement Disclosure Line Items
Total pension plan assets		867	870
Pension Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity Funds
Compensation And Retirement Disclosure Line Items
Total pension plan assets		0	0
Pension Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed Income Funds
Compensation And Retirement Disclosure Line Items
Total pension plan assets		0	0
Pension Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Real Estate Funds
Compensation And Retirement Disclosure Line Items
Total pension plan assets		0	0
Pension Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Insurance Deposit Agreements
Compensation And Retirement Disclosure Line Items
Total pension plan assets		0	0
Pension Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Companies
Compensation And Retirement Disclosure Line Items
Total pension plan assets	[1]	770	786
Pension Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | International Companies
Compensation And Retirement Disclosure Line Items
Total pension plan assets		97	74
Pension Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Private Equity Investments
Compensation And Retirement Disclosure Line Items
Total pension plan assets		0	0
Pension Benefits | Significant Other Observable Inputs (Level 2)
Compensation And Retirement Disclosure Line Items
Total pension plan assets		8,356	7,267
Pension Benefits | Significant Other Observable Inputs (Level 2) | Equity Funds
Compensation And Retirement Disclosure Line Items
Total pension plan assets		5,018	4,285
Pension Benefits | Significant Other Observable Inputs (Level 2) | Fixed Income Funds
Compensation And Retirement Disclosure Line Items
Total pension plan assets		325	567
Pension Benefits | Significant Other Observable Inputs (Level 2) | Real Estate Funds
Compensation And Retirement Disclosure Line Items
Total pension plan assets		0	0
Pension Benefits | Significant Other Observable Inputs (Level 2) | Insurance Deposit Agreements
Compensation And Retirement Disclosure Line Items
Total pension plan assets		0	0
Pension Benefits | Significant Other Observable Inputs (Level 2) | U.S. Companies
Compensation And Retirement Disclosure Line Items
Total pension plan assets	[1]	0	0
Pension Benefits | Significant Other Observable Inputs (Level 2) | International Companies
Compensation And Retirement Disclosure Line Items
Total pension plan assets		0	0
Pension Benefits | Significant Other Observable Inputs (Level 2) | Private Equity Investments
Compensation And Retirement Disclosure Line Items
Total pension plan assets		0	0
Pension Benefits | Significant Unobservable Inputs (Level 3)
Compensation And Retirement Disclosure Line Items
Total pension plan assets		189	164
Pension Benefits | Significant Unobservable Inputs (Level 3) | Equity Funds
Compensation And Retirement Disclosure Line Items
Total pension plan assets		0	0
Pension Benefits | Significant Unobservable Inputs (Level 3) | Fixed Income Funds
Compensation And Retirement Disclosure Line Items
Total pension plan assets		0	0
Pension Benefits | Significant Unobservable Inputs (Level 3) | Real Estate Funds
Compensation And Retirement Disclosure Line Items
Total pension plan assets		51	42
Pension Benefits | Significant Unobservable Inputs (Level 3) | Insurance Deposit Agreements
Compensation And Retirement Disclosure Line Items
Total pension plan assets		120	109
Pension Benefits | Significant Unobservable Inputs (Level 3) | U.S. Companies
Compensation And Retirement Disclosure Line Items
Total pension plan assets	[1]	0	0
Pension Benefits | Significant Unobservable Inputs (Level 3) | International Companies
Compensation And Retirement Disclosure Line Items
Total pension plan assets		0	0
Pension Benefits | Significant Unobservable Inputs (Level 3) | Private Equity Investments
Compensation And Retirement Disclosure Line Items
Total pension plan assets		18	13
Pension Benefits | Cash
Compensation And Retirement Disclosure Line Items
Total pension plan assets		48	71
Pension Benefits | Cash | Quoted Prices in Active Markets for Identical Assets (Level 1)
Compensation And Retirement Disclosure Line Items
Total pension plan assets		0	10
Pension Benefits | Cash | Significant Other Observable Inputs (Level 2)
Compensation And Retirement Disclosure Line Items
Total pension plan assets		48	61
Pension Benefits | Cash | Significant Unobservable Inputs (Level 3)
Compensation And Retirement Disclosure Line Items
Total pension plan assets		0	0
Pension Benefits | Treasury Securities
Compensation And Retirement Disclosure Line Items
Total pension plan assets		1,361	239
Pension Benefits | Treasury Securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Compensation And Retirement Disclosure Line Items
Total pension plan assets		0	0
Pension Benefits | Treasury Securities | Significant Other Observable Inputs (Level 2)
Compensation And Retirement Disclosure Line Items
Total pension plan assets		1,361	239
Pension Benefits | Treasury Securities | Significant Unobservable Inputs (Level 3)
Compensation And Retirement Disclosure Line Items
Total pension plan assets		0	0
Pension Benefits | Corporate Bonds
Compensation And Retirement Disclosure Line Items
Total pension plan assets	[2]	1,604	2,115
Pension Benefits | Corporate Bonds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Compensation And Retirement Disclosure Line Items
Total pension plan assets	[2]	0	0
Pension Benefits | Corporate Bonds | Significant Other Observable Inputs (Level 2)
Compensation And Retirement Disclosure Line Items
Total pension plan assets	[2]	1,604	2,115
Pension Benefits | Corporate Bonds | Significant Unobservable Inputs (Level 3)
Compensation And Retirement Disclosure Line Items
Total pension plan assets	[2]	0	0
Other Post-retirement Benefits
Compensation And Retirement Disclosure Line Items
Total pension plan assets		541	499	$ 527
Pension plan assets, excluding NAV		538	497
Other Post-retirement Benefits | Real Estate Funds
Compensation And Retirement Disclosure Line Items
Total pension plan assets		2	2
Pension plan assets, measured using NAV		2	1
Other Post-retirement Benefits | Hedge Funds
Compensation And Retirement Disclosure Line Items
Pension plan assets, measured using NAV		1	1
Other Post-retirement Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1)
Compensation And Retirement Disclosure Line Items
Total pension plan assets		72	71
Other Post-retirement Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Real Estate Funds
Compensation And Retirement Disclosure Line Items
Total pension plan assets		2	2
Other Post-retirement Benefits | Significant Other Observable Inputs (Level 2)
Compensation And Retirement Disclosure Line Items
Total pension plan assets		466	426
Other Post-retirement Benefits | Significant Other Observable Inputs (Level 2) | Real Estate Funds
Compensation And Retirement Disclosure Line Items
Total pension plan assets		0	0
Other Post-retirement Benefits | Cash
Compensation And Retirement Disclosure Line Items
Total pension plan assets		18	10
Other Post-retirement Benefits | Cash | Quoted Prices in Active Markets for Identical Assets (Level 1)
Compensation And Retirement Disclosure Line Items
Total pension plan assets		0	0
Other Post-retirement Benefits | Cash | Significant Other Observable Inputs (Level 2)
Compensation And Retirement Disclosure Line Items
Total pension plan assets		18	10
Equity Securities | Other Post-retirement Benefits
Compensation And Retirement Disclosure Line Items
Total pension plan assets		70	69
Equity Securities | Other Post-retirement Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1)
Compensation And Retirement Disclosure Line Items
Total pension plan assets		70	69
Equity Securities | Other Post-retirement Benefits | Significant Other Observable Inputs (Level 2)
Compensation And Retirement Disclosure Line Items
Total pension plan assets		0	0
Fixed Income Securities | Other Post-retirement Benefits
Compensation And Retirement Disclosure Line Items
Total pension plan assets		89	88
Fixed Income Securities | Other Post-retirement Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1)
Compensation And Retirement Disclosure Line Items
Total pension plan assets		0	0
Fixed Income Securities | Other Post-retirement Benefits | Significant Other Observable Inputs (Level 2)
Compensation And Retirement Disclosure Line Items
Total pension plan assets		89	88
Comingled Funds | Other Post-retirement Benefits | Equity Funds
Compensation And Retirement Disclosure Line Items
Total pension plan assets		260	236
Comingled Funds | Other Post-retirement Benefits | Fixed Income Funds
Compensation And Retirement Disclosure Line Items
Total pension plan assets		99	92
Comingled Funds | Other Post-retirement Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity Funds
Compensation And Retirement Disclosure Line Items
Total pension plan assets		0	0
Comingled Funds | Other Post-retirement Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed Income Funds
Compensation And Retirement Disclosure Line Items
Total pension plan assets		0	0
Comingled Funds | Other Post-retirement Benefits | Significant Other Observable Inputs (Level 2) | Equity Funds
Compensation And Retirement Disclosure Line Items
Total pension plan assets		260	236
Comingled Funds | Other Post-retirement Benefits | Significant Other Observable Inputs (Level 2) | Fixed Income Funds
Compensation And Retirement Disclosure Line Items
Total pension plan assets		$ 99	$ 92
[1]	No single equity holding amounted to more than 1% of the total fair value.
[2]	Our corporate bond investments had an average rating of BBB+.

Retirement Plans Retirement Pla

Retirement Plans Retirement Plans (Roll Forward Of Level 3 Pension Assets) (Details) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of assets at beginning of year	$ 164	$ 157
Unrealized gains (losses), net	9	(1)
Realized gains, net	2	3
Purchases, sales, and settlements, net	14	5
Fair value of assets at end of year	189	164
Real Estate Funds
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of assets at beginning of year	42	42
Unrealized gains (losses), net	4	0
Realized gains, net	0	0
Purchases, sales, and settlements, net	5	0
Fair value of assets at end of year	51	42
Insurance Deposit Agreements
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of assets at beginning of year	109	103
Unrealized gains (losses), net	4	(2)
Realized gains, net	2	3
Purchases, sales, and settlements, net	5	5
Fair value of assets at end of year	120	109
Private Equity Investments
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of assets at beginning of year	13	12
Unrealized gains (losses), net	1	1
Realized gains, net	0	0
Purchases, sales, and settlements, net	4	0
Fair value of assets at end of year	$ 18	$ 13

Business Group Information (Nar

Business Group Information (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)Segment	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Segment Reporting Information [Line Items]
Number of business groups | Segment	4
Revenue	$ 30,973	$ 30,561	$ 31,781
Earnings from continuing operations before income tax	$ 4,077	$ 3,656	$ 4,219
Long-lived assets of non-U.S. operations percent of total	5.00%	5.00%	5.00%
International Operations
Segment Reporting Information [Line Items]
Revenue	$ 3,700	$ 3,700	$ 3,700
Earnings from continuing operations before income tax	$ 550	$ 530	$ 546

Business Group Information (Seg

Business Group Information (Segment Reporting Information) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenue		$ 30,973	$ 30,561	$ 31,781
Operating earnings		4,177	3,734	4,295
Total assets		35,046	33,172	32,538
Capital Expenditures		428	392	569
Depreciation and Amortization		441	453	481
U.S. Government
Segment Reporting Information [Line Items]
Revenue		19,021	18,676	17,978
Aerospace
Segment Reporting Information [Line Items]
Revenue		8,129	7,815	9,177
Aerospace | U.S. Government
Segment Reporting Information [Line Items]
Revenue		231	361	104
Combat Systems
Segment Reporting Information [Line Items]
Revenue		5,949	5,530	5,643
Combat Systems | U.S. Government
Segment Reporting Information [Line Items]
Revenue		3,084	2,614	2,590
Information Systems and Technology
Segment Reporting Information [Line Items]
Revenue		8,891	9,144	8,929
Information Systems and Technology | U.S. Government
Segment Reporting Information [Line Items]
Revenue		7,793	7,984	7,821
Marine Systems
Segment Reporting Information [Line Items]
Revenue		8,004	8,072	8,032
Marine Systems | U.S. Government
Segment Reporting Information [Line Items]
Revenue		7,913	7,717	7,463
Corporate
Segment Reporting Information [Line Items]
Revenue	[1]	0	0	0
Operating earnings	[1]	(49)	(40)	(41)
Total assets	[1]	3,291	2,987	3,712
Capital Expenditures	[1]	26	7	41
Depreciation and Amortization	[1]	7	6	7
Corporate | U.S. Government
Segment Reporting Information [Line Items]
Revenue	[1]	0	0	0
Operating Segments | Aerospace
Segment Reporting Information [Line Items]
Revenue		8,129	7,815	9,177
Operating earnings		1,593	1,407	1,807
Total assets		10,126	9,792	9,411
Capital Expenditures		132	125	210
Depreciation and Amortization		147	153	146
Operating Segments | Aerospace | U.S. Government
Segment Reporting Information [Line Items]
Revenue		231	361	104
Operating Segments | Combat Systems
Segment Reporting Information [Line Items]
Revenue		5,949	5,530	5,643
Operating earnings		937	831	886
Total assets		9,846	8,885	7,810
Capital Expenditures		84	71	79
Depreciation and Amortization		86	86	91
Operating Segments | Combat Systems | U.S. Government
Segment Reporting Information [Line Items]
Revenue		3,084	2,614	2,590
Operating Segments | Information Systems and Technology
Segment Reporting Information [Line Items]
Revenue		8,891	9,144	8,929
Operating earnings		1,011	941	895
Total assets		8,877	8,445	8,575
Capital Expenditures		63	97	73
Depreciation and Amortization		92	103	131
Operating Segments | Information Systems and Technology | U.S. Government
Segment Reporting Information [Line Items]
Revenue		7,793	7,984	7,821
Operating Segments | Marine Systems
Segment Reporting Information [Line Items]
Revenue		8,004	8,072	8,032
Operating earnings		685	595	748
Total assets		2,906	3,063	3,030
Capital Expenditures		123	92	166
Depreciation and Amortization		109	105	106
Operating Segments | Marine Systems | U.S. Government
Segment Reporting Information [Line Items]
Revenue		$ 7,913	$ 7,717	$ 7,463
[1]	Corporate identifiable assets are primarily cash and equivalents.

Business Group Information (Sch

Business Group Information (Schedule of Revenues By Geographic Area Based On The Location of Customers) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenue	$ 30,973	$ 30,561	$ 31,781
North America
Segment Reporting Information [Line Items]
Revenue	24,434	23,869	24,601
North America | United States
Segment Reporting Information [Line Items]
Revenue	23,519	23,160	23,480
North America | Other North America
Segment Reporting Information [Line Items]
Revenue	915	709	1,121
Europe
Segment Reporting Information [Line Items]
Revenue	2,558	2,152	2,760
Asia Pacific
Segment Reporting Information [Line Items]
Revenue	2,011	1,650	1,589
Africa Middle East
Segment Reporting Information [Line Items]
Revenue	1,655	2,617	2,426
South America
Segment Reporting Information [Line Items]
Revenue	$ 315	$ 273	$ 405

Condensed Consolidating Fina106

Condensed Consolidating Financial Statements (Narrative) (Details)	12 Months Ended
	Dec. 31, 2017
Consolidating Financial Statements [Abstract]
Percentage of owned subsidiaries (the guarantors)	100.00%

Condensed Consolidating Fina107

Condensed Consolidating Financial Statements (Condensed Consolidating Statements Of Earnings) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Condensed Consolidating Financial Information [Line Items]
Revenue	$ 30,973	$ 30,561	$ 31,781
G&A	2,010	1,922	1,937
Operating earnings	4,177	3,734	4,295
Interest, net	(103)	(91)	(83)
Other, net	3	13	7
Earnings from continuing operations before income tax	4,077	3,656	4,219
Provision for income taxes, net	1,165	977	1,183
Discontinued operations, net of tax	0	(107)	0
Net earnings	2,912	2,572	3,036
Comprehensive income	3,479	2,468	2,685
Total Consolidated
Condensed Consolidating Financial Information [Line Items]
Revenue	30,973	30,561	31,781
Cost of sales	24,786	24,887	25,533
G&A	2,010	1,940	1,953
Operating earnings	4,177	3,734	4,295
Interest, net	(103)	(91)	(83)
Other, net	3	13	7
Earnings from continuing operations before income tax	4,077	3,656	4,219
Provision for income taxes, net	1,165	977	1,183
Discontinued operations, net of tax		(107)
Equity in net earnings of subsidiaries	0	0	0
Net earnings	2,912	2,572	3,036
Comprehensive income	3,479	2,468	2,685
Consolidating Adjustments
Condensed Consolidating Financial Information [Line Items]
Revenue	0	0	0
Cost of sales	0	0	0
G&A	0	0	0
Operating earnings	0	0	0
Interest, net	0	0	0
Other, net	0	0	0
Earnings from continuing operations before income tax	0	0	0
Provision for income taxes, net	0	0	0
Discontinued operations, net of tax		0
Equity in net earnings of subsidiaries	(2,899)	(2,676)	(3,010)
Net earnings	(2,899)	(2,676)	(3,010)
Comprehensive income	(3,494)	(2,655)	(2,552)
Parent
Condensed Consolidating Financial Information [Line Items]
Revenue	0	0	0
Cost of sales	(6)	0	(6)
G&A	53	39	46
Operating earnings	(47)	(39)	(40)
Interest, net	(97)	(91)	(89)
Other, net	3	12	4
Earnings from continuing operations before income tax	(141)	(118)	(125)
Provision for income taxes, net	(154)	(121)	(151)
Discontinued operations, net of tax		(107)
Equity in net earnings of subsidiaries	2,899	2,676	3,010
Net earnings	2,912	2,572	3,036
Comprehensive income	3,479	2,468	2,685
Guarantors on a Combined Basis
Condensed Consolidating Financial Information [Line Items]
Revenue	26,933	26,573	27,730
Cost of sales	21,684	21,785	22,385
G&A	1,642	1,585	1,610
Operating earnings	3,607	3,203	3,735
Interest, net	1	(2)	(1)
Other, net	0	(4)	2
Earnings from continuing operations before income tax	3,608	3,197	3,736
Provision for income taxes, net	1,262	1,055	1,202
Discontinued operations, net of tax		0
Equity in net earnings of subsidiaries	0	0	0
Net earnings	2,346	2,142	2,534
Comprehensive income	2,336	2,112	2,745
Other Subsidiaries on a Combined Basis
Condensed Consolidating Financial Information [Line Items]
Revenue	4,040	3,988	4,051
Cost of sales	3,108	3,102	3,154
G&A	315	316	297
Operating earnings	617	570	600
Interest, net	(7)	2	7
Other, net	0	5	1
Earnings from continuing operations before income tax	610	577	608
Provision for income taxes, net	57	43	132
Discontinued operations, net of tax		0
Equity in net earnings of subsidiaries	0	0	0
Net earnings	553	534	476
Comprehensive income	$ 1,158	$ 543	$ (193)

Condensed Consolidating Fina108

Condensed Consolidating Financial Statements (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and equivalents		$ 2,983	$ 2,334	$ 2,785	$ 4,388
Accounts receivable		3,617	3,399
Unbilled receivables		5,240	4,212
Inventories		5,303	5,118
Other current assets		1,185	1,471
Total current assets		18,328	16,534
Noncurrent assets:
Property, plant and equipment		8,237	7,929
Accumulated depreciation of PP&E		(4,720)	(4,452)
Intangible assets, net		702	678
Accumulated amortization of intangible assets		(1,739)	(1,676)
Goodwill	[1]	11,914	11,445	11,443
Other assets		585	1,038
Total noncurrent assets		16,718	16,638
Total assets		35,046	33,172	32,538
Current liabilities:
Short-term debt and current portion of long-term debt		2	900
Customer advances and deposits		6,992	6,827
Other current liabilities		2,898	3,185
Total current liabilities		13,099	13,450
Noncurrent liabilities:
Long-term debt		3,980	2,988
Other liabilities		6,532	6,433
Total noncurrent liabilities		10,512	9,421
Shareholders’ equity:
Common stock		482	482
Total shareholders’ equity		11,435	10,301	10,440	11,829
Total liabilities and shareholders’ equity		35,046	33,172
Parent
Current assets:
Cash and equivalents		1,930	1,254	1,732	2,536
Accounts receivable		0	0
Unbilled receivables		0	0
Inventories		0	0
Other current assets		351	634
Total current assets		2,281	1,888
Noncurrent assets:
Property, plant and equipment		221	197
Accumulated depreciation of PP&E		(75)	(67)
Intangible assets, net		0
Intangible assets			0
Goodwill		0	0
Other assets		199	640
Investment in subsidiaries		44,887	41,956
Total noncurrent assets		45,232	42,726
Total assets		47,513	44,614
Current liabilities:
Short-term debt and current portion of long-term debt		0	898
Customer advances and deposits		0	0
Other current liabilities		561	564
Total current liabilities		561	1,462
Noncurrent liabilities:
Long-term debt		3,950	2,966
Other liabilities		2,451	3,520
Total noncurrent liabilities		6,401	6,486
Intercompany		29,116	26,365
Shareholders’ equity:
Common stock		482	482
Other shareholders' equity		10,953	9,819
Total shareholders’ equity		11,435	10,301
Total liabilities and shareholders’ equity		47,513	44,614
Guarantors on a Combined Basis
Current assets:
Cash and equivalents		0	0	0	0
Accounts receivable		1,259	1,155
Unbilled receivables		2,547	2,235
Inventories		5,216	5,022
Other current assets		461	599
Total current assets		9,483	9,011
Noncurrent assets:
Property, plant and equipment		6,779	6,586
Accumulated depreciation of PP&E		(3,869)	(3,653)
Intangible assets, net		287
Intangible assets			265
Goodwill		8,320	8,050
Other assets		232	232
Investment in subsidiaries		0	0
Total noncurrent assets		11,749	11,480
Total assets		21,232	20,491
Current liabilities:
Short-term debt and current portion of long-term debt		1	2
Customer advances and deposits		4,180	4,339
Other current liabilities		3,758	3,465
Total current liabilities		7,939	7,806
Noncurrent liabilities:
Long-term debt		21	22
Other liabilities		3,473	2,330
Total noncurrent liabilities		3,494	2,352
Intercompany		(28,494)	(25,827)
Shareholders’ equity:
Common stock		6	6
Other shareholders' equity		38,287	36,154
Total shareholders’ equity		38,293	36,160
Total liabilities and shareholders’ equity		21,232	20,491
Other Subsidiaries on a Combined Basis
Current assets:
Cash and equivalents		1,053	1,080	1,053	1,852
Accounts receivable		2,358	2,244
Unbilled receivables		2,693	1,977
Inventories		87	96
Other current assets		373	238
Total current assets		6,564	5,635
Noncurrent assets:
Property, plant and equipment		1,237	1,146
Accumulated depreciation of PP&E		(776)	(732)
Intangible assets, net		415
Intangible assets			413
Goodwill		3,594	3,395
Other assets		154	166
Investment in subsidiaries		0	0
Total noncurrent assets		4,624	4,388
Total assets		11,188	10,023
Current liabilities:
Short-term debt and current portion of long-term debt		1	0
Customer advances and deposits		2,812	2,488
Other current liabilities		1,786	1,694
Total current liabilities		4,599	4,182
Noncurrent liabilities:
Long-term debt		9	0
Other liabilities		608	583
Total noncurrent liabilities		617	583
Intercompany		(622)	(538)
Shareholders’ equity:
Common stock		2,126	2,354
Other shareholders' equity		4,468	3,442
Total shareholders’ equity		6,594	5,796
Total liabilities and shareholders’ equity		11,188	10,023
Total Consolidated
Current assets:
Cash and equivalents		2,983	2,334	2,785	4,388
Accounts receivable		3,617	3,399
Unbilled receivables		5,240	4,212
Inventories		5,303	5,118
Other current assets		1,185	1,471
Total current assets		18,328	16,534
Noncurrent assets:
Property, plant and equipment		8,237	7,929
Accumulated depreciation of PP&E		(4,720)	(4,452)
Intangible assets, net		702
Intangible assets			678
Goodwill		11,914	11,445
Other assets		585	1,038
Investment in subsidiaries		0	0
Total noncurrent assets		16,718	16,638
Total assets		35,046	33,172
Current liabilities:
Short-term debt and current portion of long-term debt		2	900
Customer advances and deposits		6,992	6,827
Other current liabilities		6,105	5,723
Total current liabilities		13,099	13,450
Noncurrent liabilities:
Long-term debt		3,980	2,988
Other liabilities		6,532	6,433
Total noncurrent liabilities		10,512	9,421
Intercompany		0	0
Shareholders’ equity:
Common stock		482	482
Other shareholders' equity		10,953	9,819
Total shareholders’ equity		11,435	10,301
Total liabilities and shareholders’ equity		35,046	33,172
Consolidating Adjustments
Current assets:
Cash and equivalents		0	0	$ 0	$ 0
Accounts receivable		0	0
Unbilled receivables		0	0
Inventories		0	0
Other current assets		0	0
Total current assets		0	0
Noncurrent assets:
Property, plant and equipment		0	0
Accumulated depreciation of PP&E		0	0
Intangible assets, net		0
Intangible assets			0
Goodwill		0	0
Other assets		0	0
Investment in subsidiaries		(44,887)	(41,956)
Total noncurrent assets		(44,887)	(41,956)
Total assets		(44,887)	(41,956)
Current liabilities:
Short-term debt and current portion of long-term debt		0	0
Customer advances and deposits		0	0
Other current liabilities		0	0
Total current liabilities		0	0
Noncurrent liabilities:
Long-term debt		0	0
Other liabilities		0	0
Total noncurrent liabilities		0	0
Intercompany		0	0
Shareholders’ equity:
Common stock		(2,132)	(2,360)
Other shareholders' equity		(42,755)	(39,596)
Total shareholders’ equity		(44,887)	(41,956)
Total liabilities and shareholders’ equity		$ (44,887)	$ (41,956)
[1]	Goodwill in the Information Systems and Technology reporting unit is net of $2 billion of accumulated impairment losses.

Condensed Consolidating Fina109

Condensed Consolidating Financial Statements (Condensed Consolidating Statements Of Cash Flows) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Condensed Consolidating Financial Information [Line Items]
Net cash provided by operating activities		$ 3,879	$ 2,198	$ 2,607
Cash flows from investing activities:
Capital expenditures		(428)	(392)	(569)
Business acquisitions, net of cash acquired		(399)	(58)	(5)
Maturities of held-to-maturity securities		0	0	500
Proceeds from sales of assets		50	9	291
Net cash (used) provided by investing activities		(791)	(426)	200
Cash flows from financing activities:
Purchases of common stock		(1,558)	(1,996)	(3,233)
Proceeds from fixed-rate notes		985	992	0
Dividends paid		(986)	(911)	(873)
Repayments of fixed-rate notes		(900)	(500)	(500)
Proceeds from stock option exercises		163	292	268
Net cash used by financing activities		(2,399)	(2,169)	(4,367)
Net cash used by discontinued operations		(40)	(54)	(43)
Net increase (decrease) in cash and equivalents		649	(451)	(1,603)
Cash and equivalents at beginning of year		2,334	2,785	4,388
Cash and equivalents at end of year		2,983	2,334	2,785
Parent
Condensed Consolidating Financial Information [Line Items]
Net cash provided by operating activities	[1]	316	219	50
Cash flows from investing activities:
Capital expenditures		(26)	(8)	(42)
Business acquisitions, net of cash acquired		0
Maturities of held-to-maturity securities				500
Other, net		6	5	166
Net cash (used) provided by investing activities		(20)	(3)	624
Cash flows from financing activities:
Purchases of common stock		(1,558)	(1,996)	(3,233)
Proceeds from fixed-rate notes		985	992
Dividends paid		(986)	(911)	(873)
Repayments of fixed-rate notes		(900)	(500)	(500)
Proceeds from stock option exercises			292
Other, net		63	(45)	237
Net cash used by financing activities		(2,396)	(2,168)	(4,369)
Net cash used by discontinued operations		(40)	(54)	(43)
Cash sweep/funding by parent		2,816	1,528	2,934
Net increase (decrease) in cash and equivalents		676	(478)	(804)
Cash and equivalents at beginning of year		1,254	1,732	2,536
Cash and equivalents at end of year		1,930	1,254	1,732
Guarantors on a Combined Basis
Condensed Consolidating Financial Information [Line Items]
Net cash provided by operating activities	[1]	2,370	1,914	2,202
Cash flows from investing activities:
Capital expenditures		(330)	(336)	(475)
Business acquisitions, net of cash acquired		(350)
Maturities of held-to-maturity securities				0
Other, net		32	(1)	103
Net cash (used) provided by investing activities		(648)	(337)	(372)
Cash flows from financing activities:
Purchases of common stock		0	0	0
Proceeds from fixed-rate notes		0	0
Dividends paid		0	0	0
Repayments of fixed-rate notes		0	0	0
Proceeds from stock option exercises			0
Other, net		(3)	(1)	2
Net cash used by financing activities		(3)	(1)	2
Net cash used by discontinued operations		0	0	0
Cash sweep/funding by parent		(1,719)	(1,576)	(1,832)
Net increase (decrease) in cash and equivalents		0	0	0
Cash and equivalents at beginning of year		0	0	0
Cash and equivalents at end of year		0	0	0
Other Subsidiaries on a Combined Basis
Condensed Consolidating Financial Information [Line Items]
Net cash provided by operating activities	[1]	1,193	65	355
Cash flows from investing activities:
Capital expenditures		(72)	(48)	(52)
Business acquisitions, net of cash acquired		(49)
Maturities of held-to-maturity securities				0
Other, net		(2)	(38)	0
Net cash (used) provided by investing activities		(123)	(86)	(52)
Cash flows from financing activities:
Purchases of common stock		0	0	0
Proceeds from fixed-rate notes		0	0
Dividends paid		0	0	0
Repayments of fixed-rate notes		0	0	0
Proceeds from stock option exercises			0
Other, net		0	0	0
Net cash used by financing activities		0	0	0
Net cash used by discontinued operations		0	0	0
Cash sweep/funding by parent		(1,097)	48	(1,102)
Net increase (decrease) in cash and equivalents		(27)	27	(799)
Cash and equivalents at beginning of year		1,080	1,053	1,852
Cash and equivalents at end of year		1,053	1,080	1,053
Total Consolidated
Condensed Consolidating Financial Information [Line Items]
Net cash provided by operating activities	[1]	3,879	2,198	2,607
Cash flows from investing activities:
Capital expenditures		(428)	(392)	(569)
Business acquisitions, net of cash acquired		(399)
Maturities of held-to-maturity securities				500
Other, net		36	(34)	269
Net cash (used) provided by investing activities		(791)	(426)	200
Cash flows from financing activities:
Purchases of common stock		(1,558)	(1,996)	(3,233)
Proceeds from fixed-rate notes		985	992
Dividends paid		(986)	(911)	(873)
Repayments of fixed-rate notes		(900)	(500)	(500)
Proceeds from stock option exercises			292
Other, net		60	(46)	239
Net cash used by financing activities		(2,399)	(2,169)	(4,367)
Net cash used by discontinued operations		(40)	(54)	(43)
Cash sweep/funding by parent		0	0	0
Net increase (decrease) in cash and equivalents		649	(451)	(1,603)
Cash and equivalents at beginning of year		2,334	2,785	4,388
Cash and equivalents at end of year		2,983	2,334	2,785
Consolidating Adjustments
Condensed Consolidating Financial Information [Line Items]
Net cash provided by operating activities	[1]	0	0	0
Cash flows from investing activities:
Capital expenditures		0	0	0
Business acquisitions, net of cash acquired		0
Maturities of held-to-maturity securities				0
Other, net		0	0	0
Net cash (used) provided by investing activities		0	0	0
Cash flows from financing activities:
Purchases of common stock		0	0	0
Proceeds from fixed-rate notes		0	0
Dividends paid		0	0	0
Repayments of fixed-rate notes		0	0	0
Proceeds from stock option exercises			0
Other, net		0	0	0
Net cash used by financing activities		0	0	0
Net cash used by discontinued operations		0	0	0
Cash sweep/funding by parent		0	0	0
Net increase (decrease) in cash and equivalents		0	0	0
Cash and equivalents at beginning of year		0	0	0
Cash and equivalents at end of year		$ 0	$ 0	$ 0
[1]	* Continuing operations only.

Prior-Period Financial State110

Prior-Period Financial Statements (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Jan. 01, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement, Cumulative Effect of Change on Equity	$ 3
Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement, Cumulative Effect of Change on Equity		$ 372

Prior-Period Financial State111

Prior-Period Financial Statements (Consolidated Statement of Earnings) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Products	$ 19,016	$ 19,010	$ 20,477
Services	11,957	11,551	11,304
Revenue	30,973	30,561	31,781
Products	14,799	15,159	15,986
Services	9,987	9,746	9,563
General and administrative (G&A)	2,010	1,922	1,937
Operating costs and expenses, total	26,796	26,827	27,486
Operating earnings	4,177	3,734	4,295
Interest, net	(103)	(91)	(83)
Other, net	3	13	7
Earnings from continuing operations before income tax	4,077	3,656	4,219
Provision for income taxes, net	1,165	977	1,183
Earnings from continuing operations	2,912	2,679	3,036
Discontinued operations, net of tax benefit of $51 in 2016 and $7 in 2015	0	(107)	0
Discontinued operations, tax benefit	0	(51)	(7)
Net earnings	$ 2,912	$ 2,572	$ 3,036
Continuing operations	$ 9.73	$ 8.79	$ 9.45
Discontinued operations	0	(0.35)	0
Basic	9.73	8.44	9.45
Continuing operations	9.56	8.64	9.29
Discontinued operations	0	(0.35)	0
Diluted earnings per share	$ 9.56	$ 8.29	$ 9.29
Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Products		$ 19,885	$ 20,280
Services		11,468	11,189
Revenue		31,353	31,469
Products		15,458	15,883
Services		9,663	9,471
General and administrative (G&A)		1,923	1,937
Operating costs and expenses, total		27,044	27,291
Operating earnings		4,309	4,178
Interest, net		(91)	(83)
Other, net		13	7
Earnings from continuing operations before income tax		4,231	4,102
Provision for income taxes, net		1,169	1,137
Earnings from continuing operations		3,062	2,965
Discontinued operations, net of tax benefit of $51 in 2016 and $7 in 2015		(107)	0
Discontinued operations, tax benefit		(51)	(7)
Net earnings		$ 2,955	$ 2,965
Continuing operations		$ 10.05	$ 9.23
Discontinued operations		(0.35)	0
Basic		9.70	9.23
Continuing operations		9.87	9.08
Discontinued operations		(0.35)	0
Diluted earnings per share		$ 9.52	$ 9.08
Restatement Adjustment | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Products		$ (875)	$ 197
Services		83	115
Revenue		(792)	312
Products		(299)	103
Services		83	92
General and administrative (G&A)		(1)	0
Operating costs and expenses, total		(217)	195
Operating earnings		(575)	117
Interest, net		0	0
Other, net		0	0
Earnings from continuing operations before income tax		(575)	117
Provision for income taxes, net		(192)	46
Earnings from continuing operations		(383)	71
Discontinued operations, net of tax benefit of $51 in 2016 and $7 in 2015		0	0
Discontinued operations, tax benefit		0	0
Net earnings		$ (383)	$ 71
Continuing operations		$ (1.26)	$ 0.22
Discontinued operations		0	0
Basic		(1.26)	0.22
Continuing operations		(1.23)	0.21
Discontinued operations		0	0
Diluted earnings per share		$ (1.23)	$ 0.21
Restatement Adjustment | Accounting Standards Update 2015-17
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Products		$ 0	$ 0
Services		0	0
Revenue		0	0
Products		0	0
Services		0	0
General and administrative (G&A)		0	0
Operating costs and expenses, total		0	0
Operating earnings		0	0
Interest, net		0	0
Other, net		0	0
Earnings from continuing operations before income tax		0	0
Provision for income taxes, net		0	0
Earnings from continuing operations		0	0
Discontinued operations, net of tax benefit of $51 in 2016 and $7 in 2015		0	0
Discontinued operations, tax benefit		0	0
Net earnings		$ 0	$ 0
Continuing operations		$ 0	$ 0
Discontinued operations		0	0
Basic		0	0
Continuing operations		0	0
Discontinued operations		0	0
Diluted earnings per share		$ 0	$ 0

Prior-Period Financial State112

Prior-Period Financial Statements (Consolidated Statement of Comprehensive Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net earnings	$ 2,912	$ 2,572	$ 3,036
Gains (losses) on cash flow hedges	341	191	(394)
Unrealized gains (losses) on securities	9	(9)	(2)
Foreign currency translation adjustments	348	(112)	(371)
Change in retirement plans' funded status	20	(192)	500
Other comprehensive income, pretax	718	(122)	(267)
Provision (benefit) for income tax, net	151	(18)	84
Other comprehensive income	567	(104)	(351)
Comprehensive income	$ 3,479	2,468	2,685
Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net earnings		2,955	2,965
Gains (losses) on cash flow hedges		191	(394)
Unrealized gains (losses) on securities		(9)	(2)
Foreign currency translation adjustments		(118)	(374)
Change in retirement plans' funded status		(192)	500
Other comprehensive income, pretax		(128)	(270)
Provision (benefit) for income tax, net		(18)	84
Other comprehensive income		(110)	(354)
Comprehensive income		2,845	2,611
Accounting Standards Update 2014-09 | Restatement Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net earnings		(383)	71
Gains (losses) on cash flow hedges		0	0
Unrealized gains (losses) on securities		0	0
Foreign currency translation adjustments		6	3
Change in retirement plans' funded status		0	0
Other comprehensive income, pretax		6	3
Provision (benefit) for income tax, net		0	0
Other comprehensive income		6	3
Comprehensive income		(377)	74
Accounting Standards Update 2015-17 | Restatement Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net earnings		0	0
Gains (losses) on cash flow hedges		0	0
Unrealized gains (losses) on securities		0	0
Foreign currency translation adjustments		0	0
Change in retirement plans' funded status		0	0
Other comprehensive income, pretax		0	0
Provision (benefit) for income tax, net		0	0
Other comprehensive income		0	0
Comprehensive income		$ 0	$ 0

Prior-Period Financial State113

Prior-Period Financial Statements (Consolidated Balance Sheet) (Details) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash and equivalents		$ 2,983	$ 2,334	$ 2,785	$ 4,388
Accounts receivable		3,617	3,399
Unbilled receivables		5,240	4,212
Inventories		5,303	5,118
Other current assets		1,185	1,471
Total current assets		18,328	16,534
Property, plant and equipment, net		3,517	3,477
Intangible assets, net		702	678
Goodwill	[1]	11,914	11,445	11,443
Other assets		585	1,038
Total noncurrent assets		16,718	16,638
Total assets		35,046	33,172	32,538
Short-term debt and current portion of long-term debt		2	900
Accounts payable		3,207	2,538
Customer advances and deposits		6,992	6,827
Other current liabilities		2,898	3,185
Total current liabilities		13,099	13,450
Long-term debt		3,980	2,988
Other liabilities		6,532	6,433
Commitments and contingencies (see Note O)
Total noncurrent liabilities		10,512	9,421
Common stock		482	482
Surplus		2,872	2,819
Retained earnings		26,444	24,543
Treasury stock		(15,543)	(14,156)
Accumulated other comprehensive loss		(2,820)	(3,387)	(3,283)	(2,932)
Total shareholders’ equity		11,435	10,301	10,440	11,829
Total liabilities and shareholders’ equity		35,046	33,172
Current deferred tax liabilities		(786)	(693)
Noncurrent deferred tax liabilities		$ 244	183
Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash and equivalents			2,334	2,785	4,388
Accounts receivable			3,611
Unbilled receivables			5,282
Inventories			3,523
Other current assets			697
Total current assets			15,447
Property, plant and equipment, net			3,467
Intangible assets, net			678
Goodwill			11,445
Other assets			1,835
Total noncurrent assets			17,425
Total assets			32,872
Short-term debt and current portion of long-term debt			900
Accounts payable			2,538
Customer advances and deposits			4,939
Other current liabilities			4,469
Total current liabilities			12,846
Long-term debt			2,988
Other liabilities			6,062
Total noncurrent liabilities			9,050
Common stock			482
Surplus			2,819
Retained earnings			25,227
Treasury stock			(14,156)
Accumulated other comprehensive loss			(3,396)
Total shareholders’ equity			10,976		11,829
Total liabilities and shareholders’ equity			32,872
Restatement Adjustment | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash and equivalents			0	0	0
Accounts receivable			(212)
Unbilled receivables			(1,070)
Inventories			1,595
Other current assets			789
Total current assets			1,102
Property, plant and equipment, net			10
Intangible assets, net			0
Goodwill			0
Other assets			0
Total noncurrent assets			10
Total assets			1,112
Short-term debt and current portion of long-term debt			0
Accounts payable			0
Customer advances and deposits			1,888
Other current liabilities			(361)
Total current liabilities			1,527
Long-term debt			0
Other liabilities			260
Total noncurrent liabilities			260
Common stock			0
Surplus			0
Retained earnings			(684)
Treasury stock			0
Accumulated other comprehensive loss			9
Total shareholders’ equity			(675)
Total liabilities and shareholders’ equity			1,112
Restatement Adjustment | Accounting Standards Update 2015-17
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash and equivalents			0	$ 0	$ 0
Accounts receivable			0
Unbilled receivables			0
Inventories			0
Other current assets			(15)
Total current assets			(15)
Property, plant and equipment, net			0
Intangible assets, net			0
Goodwill			0
Other assets			(797)
Total noncurrent assets			(797)
Total assets			(812)
Short-term debt and current portion of long-term debt			0
Accounts payable			0
Customer advances and deposits			0
Other current liabilities			(923)
Total current liabilities			(923)
Long-term debt			0
Other liabilities			111
Total noncurrent liabilities			111
Common stock			0
Surplus			0
Retained earnings			0
Treasury stock			0
Accumulated other comprehensive loss			0
Total shareholders’ equity			0
Total liabilities and shareholders’ equity			(812)
Current deferred tax assets			10
Current deferred tax liabilities			$ 335
[1]	Goodwill in the Information Systems and Technology reporting unit is net of $2 billion of accumulated impairment losses.

Prior-Period Financial State114

Prior-Period Financial Statements (Consolidated Statement of Cash Flows) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net earnings		$ 2,912	$ 2,572	$ 3,036
Depreciation of property, plant and equipment		362	365	365
Amortization of intangible assets		79	88	116
Equity-based compensation expense		123	95	98
Deferred income tax provision		401	184	213
Discontinued operations, net of tax		0	107	0
Accounts receivable		(195)	(122)	632
Unbilled receivables		(987)	(1,048)	61
Inventories		(182)	(377)	141
Other current assets		207	315	80
Accounts payable		657	567	(89)
Customer advances and deposits		264	(305)	(2,153)
Other, net		238	(243)	107
Net cash provided by operating activities		3,879	2,198	2,607
Capital expenditures		(428)	(392)	(569)
Maturities of held-to-maturity securities		0	0	500
Business acquisitions, net of cash acquired		(399)	(58)	(5)
Proceeds from sales of assets		50	9	291
Other, net		(14)	15	(17)
Net cash used by investing activities		(791)	(426)	200
Purchases of common stock		(1,558)	(1,996)	(3,233)
Proceeds from fixed-rate notes		985	992	0
Dividends paid		(986)	(911)	(873)
Repayments of fixed-rate notes		(900)	(500)	(500)
Proceeds from stock option exercises		163	292	268
Other, net		(103)	(46)	(29)
Net cash used by financing activities		(2,399)	(2,169)	(4,367)
Net cash used by discontinued operations		(40)	(54)	(43)
Net increase (decrease) in cash and equivalents		649	(451)	(1,603)
Cash and equivalents at beginning of year		2,334	2,785	4,388
Cash and equivalents at end of year		2,983	2,334	2,785
Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net earnings			2,955	2,965
Depreciation of property, plant and equipment			366	366
Amortization of intangible assets			88	116
Equity-based compensation expense			95	98
Deferred income tax provision			376	167
Discontinued operations, net of tax			107	0
Accounts receivable			(161)	604
Unbilled receivables			(1,033)	231
Inventories			(154)	(156)
Other current assets			55	(38)
Accounts payable			567	(89)
Customer advances and deposits			(825)	(1,756)
Other, net			(238)	99
Net cash provided by operating activities			2,198	2,607
Capital expenditures			(392)	(569)
Maturities of held-to-maturity securities				500
Business acquisitions, net of cash acquired			(58)	(5)
Proceeds from sales of assets			9	291
Other, net			15	(17)
Net cash used by investing activities			(426)	200
Purchases of common stock			(1,996)	(3,233)
Proceeds from fixed-rate notes			992
Dividends paid			(911)	(873)
Repayments of fixed-rate notes			(500)	(500)
Proceeds from stock option exercises			292	268
Other, net			(46)	(29)
Net cash used by financing activities			(2,169)	(4,367)
Net cash used by discontinued operations			(54)	(43)
Net increase (decrease) in cash and equivalents			(451)	(1,603)
Cash and equivalents at beginning of year		2,334	2,785	4,388
Cash and equivalents at end of year			2,334	2,785
Restatement Adjustment | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net earnings			(383)	71
Depreciation of property, plant and equipment			(1)	(1)
Amortization of intangible assets			0	0
Equity-based compensation expense			0	0
Deferred income tax provision			(192)	46
Discontinued operations, net of tax			0	0
Accounts receivable			39	28
Unbilled receivables			(15)	(170)
Inventories			(223)	297
Other current assets			260	118
Accounts payable			0	0
Customer advances and deposits			520	(397)
Other, net			(5)	8
Net cash provided by operating activities			0	0
Capital expenditures			0	0
Maturities of held-to-maturity securities				0
Business acquisitions, net of cash acquired			0	0
Proceeds from sales of assets			0	0
Other, net			0	0
Net cash used by investing activities			0	0
Purchases of common stock			0	0
Proceeds from fixed-rate notes			0
Dividends paid			0	0
Repayments of fixed-rate notes			0	0
Proceeds from stock option exercises			0	0
Other, net			0	0
Net cash used by financing activities			0	0
Net cash used by discontinued operations			0	0
Net increase (decrease) in cash and equivalents			0	0
Cash and equivalents at beginning of year		0	0	0
Cash and equivalents at end of year			0	0
Restatement Adjustment | Accounting Standards Update 2015-17
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net earnings			0	0
Depreciation of property, plant and equipment			0	0
Amortization of intangible assets			0	0
Equity-based compensation expense			0	0
Deferred income tax provision			0	0
Discontinued operations, net of tax			0	0
Accounts receivable			0	0
Unbilled receivables			0	0
Inventories			0	0
Other current assets			0	0
Accounts payable			0	0
Customer advances and deposits			0	0
Other, net			0	0
Net cash provided by operating activities			0	0
Capital expenditures			0	0
Maturities of held-to-maturity securities				0
Business acquisitions, net of cash acquired			0	0
Proceeds from sales of assets			0	0
Other, net			0	0
Net cash used by investing activities			0	0
Purchases of common stock			0	0
Proceeds from fixed-rate notes			0
Dividends paid			0	0
Repayments of fixed-rate notes			0	0
Proceeds from stock option exercises			0	0
Other, net			0	0
Net cash used by financing activities			0	0
Net cash used by discontinued operations			0	0
Net increase (decrease) in cash and equivalents			0	0
Cash and equivalents at beginning of year		0	0	0
Cash and equivalents at end of year			0	0
Consolidating Adjustments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net earnings		(2,899)	(2,676)	(3,010)
Discontinued operations, net of tax			0
Net cash provided by operating activities	[1]	0	0	0
Capital expenditures		0	0	0
Maturities of held-to-maturity securities				0
Business acquisitions, net of cash acquired		0
Net cash used by investing activities		0	0	0
Purchases of common stock		0	0	0
Proceeds from fixed-rate notes		0	0
Dividends paid		0	0	0
Repayments of fixed-rate notes		0	0	0
Proceeds from stock option exercises			0
Net cash used by financing activities		0	0	0
Net cash used by discontinued operations		0	0	0
Net increase (decrease) in cash and equivalents		0	0	0
Cash and equivalents at beginning of year		0	0	0
Cash and equivalents at end of year		$ 0	$ 0	$ 0
[1]	* Continuing operations only.

Prior-Period Financial State115

Prior-Period Financial Statements (Consolidated Statement of Shareholders' Equity) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total shareholders’ equity - as reported	$ 10,301	$ 10,440	$ 11,435	$ 11,829
Effect of adoption of ASC Topic 606				(372)
Total shareholders' equity - as adjusted	10,301	10,440		11,457
Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effect of adoption of ASC Topic 606	(377)	74
Accounting Standards Update 2015-17
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effect of adoption of ASC Topic 606	0	0
Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total shareholders’ equity - as reported	10,976			11,829
Stockholders' equity, period increase (decrease), excluding impact of adjustments	238	(1,091)
Common Stock
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total shareholders’ equity - as reported	482	482	482	482
Total shareholders' equity - as adjusted	482	482		482
Common Stock | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effect of adoption of ASC Topic 606	0	0
Common Stock | Accounting Standards Update 2015-17
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effect of adoption of ASC Topic 606	0	0
Common Stock | Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total shareholders’ equity - as reported				482
Stockholders' equity, period increase (decrease), excluding impact of adjustments	0	0
Common Stock Surplus
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total shareholders’ equity - as reported	2,819	2,730	2,872	2,548
Total shareholders' equity - as adjusted	2,819	2,730		2,548
Common Stock Surplus | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effect of adoption of ASC Topic 606	0	0
Common Stock Surplus | Accounting Standards Update 2015-17
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effect of adoption of ASC Topic 606	0	0
Common Stock Surplus | Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total shareholders’ equity - as reported				2,548
Stockholders' equity, period increase (decrease), excluding impact of adjustments	89	182
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total shareholders’ equity - as reported	24,543	22,903	26,444	21,127
Effect of adoption of ASC Topic 606				(372)
Total shareholders' equity - as adjusted	24,543	22,903		20,755
Retained Earnings | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effect of adoption of ASC Topic 606	(383)	71
Retained Earnings | Accounting Standards Update 2015-17
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effect of adoption of ASC Topic 606	0	0
Retained Earnings | Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total shareholders’ equity - as reported				21,127
Stockholders' equity, period increase (decrease), excluding impact of adjustments	2,023	2,077
Treasury Stock
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total shareholders’ equity - as reported	(14,156)	(12,392)	(15,543)	(9,396)
Total shareholders' equity - as adjusted	(14,156)	(12,392)		(9,396)
Treasury Stock | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effect of adoption of ASC Topic 606	0	0
Treasury Stock | Accounting Standards Update 2015-17
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effect of adoption of ASC Topic 606	0	0
Treasury Stock | Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total shareholders’ equity - as reported				(9,396)
Stockholders' equity, period increase (decrease), excluding impact of adjustments	(1,764)	(2,996)
Accumulated Other Comprehensive Loss
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total shareholders’ equity - as reported	(3,387)	(3,283)	$ (2,820)	(2,932)
Total shareholders' equity - as adjusted	(3,387)	(3,283)		(2,932)
Accumulated Other Comprehensive Loss | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effect of adoption of ASC Topic 606	6	3
Accumulated Other Comprehensive Loss | Accounting Standards Update 2015-17
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effect of adoption of ASC Topic 606	0	0
Accumulated Other Comprehensive Loss | Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total shareholders’ equity - as reported				$ (2,932)
Stockholders' equity, period increase (decrease), excluding impact of adjustments	$ (110)	$ (354)