U.S. Bancorp (USB) 10-Q 1 Nov 13 2013 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2013	Oct. 31, 2013
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-13	'
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q3	'
Trading Symbol	'USB	'
Entity Registrant Name	'US BANCORP \DE\	'
Entity Central Index Key	'0000036104	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	1,826,304,944

Consolidated_Balance_Sheet_Una

Consolidated Balance Sheet (Unaudited) (USD $)	Sep. 30, 2013		Dec. 31, 2012
In Millions, unless otherwise specified
Assets	'		'
Cash and due from banks	$11,615		$8,252
Investment securities	'		'
Held-to-maturity (fair value $36,632 and $34,952, respectively; including $937 and $1,482 at fair value pledged as collateral, respectively)	36,904	[1]	34,389	[1]
Available-for-sale ($1,105 and $2,042 pledged as collateral, respectively)	39,307	[1]	40,139	[1]
Loans held for sale (including $3,844 and $7,957 of mortgage loans carried at fair value, respectively)	3,858		7,976
Loans	'		'
Commercial	68,958		66,223
Commercial real estate	38,678		36,953
Residential mortgages	50,170		44,018
Credit Card	17,063		17,115
Other retail	47,114		47,712
Total Loans	221,983		212,021
Covered loans	9,396		11,308
Total loans	231,379		223,329
Less allowance for loan losses	-4,258		-4,424
Net loans	227,121		218,905
Premises and equipment	2,608		2,670
Goodwill	9,173		9,143
Other intangible assets	3,455		2,706
Other assets (including $168 and $47 of trading securities at fair value pledged as collateral, respectively)	26,640	[1]	29,675	[1]
Total assets	360,681		353,855
Deposits	'		'
Noninterest-bearing	72,333		74,172
Interest-bearing	152,861		145,972
Time deposits greater than $100,000	36,522		29,039
Total deposits	261,716		249,183
Short-term borrowings	26,128		26,302
Long-term debt	18,750		25,516
Other liabilities	12,535		12,587
Total liabilities	319,129		313,588
Shareholders' equity	'		'
Preferred stock	4,756		4,769
Common stock, par value $0.01 a share-authorized: 4,000,000,000 shares; issued: 9/30/13 and 12/31/12 -2,125,725,742 shares	21		21
Capital surplus	8,188		8,201
Retained earnings	37,692		34,720
Less cost of common stock in treasury: 9/30/13-294,069,246 shares; 12/31/12 -256,294,227 shares	-9,174		-7,790
Accumulated other comprehensive income (loss)	-1,351		-923
Total U.S. Bancorp shareholders' equity	40,132		38,998
Noncontrolling interests	1,420		1,269
Total equity	41,552		40,267
Total liabilities and equity	$360,681		$353,855
[1]	Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

Consolidated_Balance_Sheet_Una1

Consolidated Balance Sheet (Unaudited) (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Held-to-maturity securities, fair value	$36,632,000,000	$34,952,000,000
Securities, pledged as collateral	2,000,000,000	3,500,000,000
Mortgage loans, carried at fair value	3,844,000,000	7,957,000,000
Time deposits	100,000	100,000
Common stock, par value	$0.01	$0.01
Common stock, share-authorized (actual number of shares)	4,000,000,000	4,000,000,000
Common stock, shares issued (actual number of shares)	2,125,725,742	2,125,725,742
Treasury stock, shares (actual number of shares)	294,069,246	256,294,227
Held-to-maturity Securities [Member]	'	'
Securities, pledged as collateral	937,000,000	1,482,000,000
Available-for-Sale Securities [Member]	'	'
Securities, pledged as collateral	1,105,000,000	2,042,000,000
Trading Securities [Member]	'	'
Securities, pledged as collateral	$168,000,000	$47,000,000

Consolidated_Statement_of_Inco

Consolidated Statement of Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest Income	'	'	'	'
Loans	$2,568	$2,650	$7,682	$7,919
Loans held for sale	46	76	172	208
Investment securities	420	438	1,222	1,376
Other interest income	34	63	141	184
Total interest income	3,068	3,227	9,217	9,687
Interest Expense	'	'	'	'
Deposits	134	172	433	530
Short-term borrowings	98	103	270	353
Long-term debt	178	226	587	786
Total interest expense	410	501	1,290	1,669
Net interest income	2,658	2,726	7,927	8,018
Provision for credit losses	298	488	1,063	1,439
Net interest income after provision for credit losses	2,360	2,238	6,864	6,579
Noninterest Income	'	'	'	'
Credit and debit card revenue	244	213	702	650
Corporate payment products revenue	192	201	540	566
Merchant processing services	371	345	1,091	1,041
ATM processing services	83	87	248	263
Trust and investment management fees	280	265	842	779
Deposit service charges	180	174	493	483
Treasury management fees	134	135	408	411
Commercial products revenue	207	225	616	652
Mortgage banking revenue	328	519	1,125	1,461
Investment products fees	46	38	133	111
Securities gains (losses), net	'	'	'	'
Realized gains (losses), net	'	16	21	46
Total other-than-temporary impairment	-2	-13	-5	-61
Portion of other-than-temporary impairment recognized in other comprehensive income	-1	-2	-8	-3
Total securities gains (losses), net	-3	1	8	-18
Other	115	193	412	591
Total noninterest income	2,177	2,396	6,618	6,990
Noninterest Expense	'	'	'	'
Compensation	1,088	1,109	3,268	3,237
Employee benefits	278	225	865	714
Net occupancy and equipment	240	233	709	683
Professional services	94	144	263	364
Marketing and business development	85	96	254	285
Technology and communications	214	205	639	607
Postage, printing and supplies	76	75	230	226
Other intangibles	55	67	167	208
Other	435	455	1,197	1,446
Total noninterest expense	2,565	2,609	7,592	7,770
Income before income taxes	1,972	2,025	5,890	5,799
Applicable income taxes	542	593	1,629	1,684
Net income	1,430	1,432	4,261	4,115
Net (income) loss attributable to noncontrolling interests	38	42	119	112
Net income attributable to U.S. Bancorp	1,468	1,474	4,380	4,227
Net income applicable to U.S. Bancorp common shareholders	$1,400	$1,404	$4,163	$4,034
Earnings per common share	$0.76	$0.74	$2.26	$2.13
Diluted earnings per common share	$0.76	$0.74	$2.25	$2.12
Dividends declared per common share	$0.23	$0.20	$0.66	$0.59
Average common shares outstanding	1,832	1,886	1,844	1,892
Average diluted common shares outstanding	1,843	1,897	1,854	1,901

Consolidated_Statement_of_Comp

Consolidated Statement of Comprehensive Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]	'	'	'	'
Net income	$1,430	$1,432	$4,261	$4,115
Other Comprehensive Income (Loss)	'	'	'	'
Changes in unrealized gains and losses on securities available-for-sale	-237	300	-1,032	738
Other-than-temporary impairment not recognized in earnings on securities available-for-sale	1	2	8	3
Changes in unrealized gains and losses on derivative hedges	-17	-30	33	-68
Foreign currency translation	13	26	-20	34
Changes in unrealized gains and losses on retirement plans	38	'	37	'
Reclassification to earnings of realized gains and losses	99	69	270	260
Income taxes related to other comprehensive income	40	-140	276	-370
Total other comprehensive income (loss)	-63	227	-428	597
Comprehensive income	1,367	1,659	3,833	4,712
Comprehensive (income) loss attributable to noncontrolling interests	38	42	119	112
Comprehensive income attributable to U.S. Bancorp	$1,405	$1,701	$3,952	$4,824

Consolidated_Statement_of_Shar

Consolidated Statement of Shareholders' Equity (Unaudited) (USD $)	Total	Common Stock [Member]	Preferred Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total U.S. Bancorp Shareholders' Equity [Member]	Noncontrolling Interests [Member]
In Millions
Beginning Balance at Dec. 31, 2011	$34,971	$21	$2,606	$8,238	$30,785	($6,472)	($1,200)	$33,978	$993
Share, Beginning Balance at Dec. 31, 2011	'	1,910	'	'	'	'	'	'	'
Net income (loss)	4,115	'	'	'	'	'	'	'	'
Net (income) loss attributable to noncontrolling interests	-112	'	'	'	'	'	'	'	-112
Net income attributable to U.S. Bancorp	4,227	'	'	'	4,227	'	'	4,227	'
Other comprehensive income (loss)	597	'	'	'	'	'	597	597	'
Preferred stock dividends	-174	'	'	'	-174	'	'	-174	'
Common stock dividends	-1,108	'	'	'	-1,108	'	'	-1,108	'
Issuance of preferred stock	2,163	'	2,163	'	'	'	'	2,163	'
Issuance of common and treasury stock	384	'	'	-111	'	495	'	384	'
Issuance of common and treasury stock, shares	'	16	'	'	'	'	'	'	'
Purchase of treasury stock	-1,465	'	'	'	'	-1,465	'	-1,465	'
Purchase of treasury stock, shares	'	-46	'	'	'	'	'	'	'
Distributions to noncontrolling interests	-60	'	'	'	'	'	'	'	-60
Net other changes in noncontrolling interests	343	'	'	'	'	'	'	'	343
Stock option and restricted stock grants	59	'	'	59	'	'	'	59	'
Ending Balance at Sep. 30, 2012	39,825	21	4,769	8,186	33,730	-7,442	-603	38,661	1,164
Shares, Ending Balance at Sep. 30, 2012	'	1,880	'	'	'	'	'	'	'
Beginning Balance at Dec. 31, 2012	40,267	21	4,769	8,201	34,720	-7,790	-923	38,998	1,269
Share, Beginning Balance at Dec. 31, 2012	'	1,869	'	'	'	'	'	'	'
Net income (loss)	4,261	'	'	'	'	'	'	'	'
Net (income) loss attributable to noncontrolling interests	-119	'	'	'	'	'	'	'	-119
Net income attributable to U.S. Bancorp	4,380	'	'	'	4,380	'	'	4,380	'
Other comprehensive income (loss)	-428	'	'	'	'	'	-428	-428	'
Redemption of preferred stock	-500	'	-500	8	-8	'	'	-500	'
Preferred stock dividends	-189	'	'	'	-189	'	'	-189	'
Common stock dividends	-1,211	'	'	'	-1,211	'	'	-1,211	'
Issuance of preferred stock	487	'	487	'	'	'	'	487	'
Issuance of common and treasury stock	345	'	'	-114	'	459	'	345	'
Issuance of common and treasury stock, shares	'	15	'	'	'	'	'	'	'
Purchase of treasury stock	-1,843	'	'	'	'	-1,843	'	-1,843	'
Purchase of treasury stock, shares	'	-52	'	'	'	'	'	'	'
Distributions to noncontrolling interests	-45	'	'	'	'	'	'	'	-45
Net other changes in noncontrolling interests	315	'	'	'	'	'	'	'	315
Stock option and restricted stock grants	93	'	'	93	'	'	'	93	'
Ending Balance at Sep. 30, 2013	$41,552	$21	$4,756	$8,188	$37,692	($9,174)	($1,351)	$40,132	$1,420
Shares, Ending Balance at Sep. 30, 2013	'	1,832	'	'	'	'	'	'	'

Consolidated_Statement_of_Cash

Consolidated Statement of Cash Flows (Unaudited) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Operating Activities	'	'
Net income attributable to U.S. Bancorp	$4,380	$4,227
Adjustments to reconcile net income to net cash provided by operating activities	'	'
Provision for credit losses	1,063	1,439
Depreciation and amortization of premises and equipment	222	212
Amortization of intangibles	167	208
Provision for deferred income taxes	-38	29
(Gain) loss on sale of loans held for sale	-864	-1,982
(Gain) loss on sale of securities and other assets	-42	-198
Loans originated for sale in the secondary market, net of repayments	-49,411	-60,331
Proceeds from sales of loans held for sale	53,845	59,052
Other, net	-665	1,219
Net cash provided by operating activities	8,657	3,875
Investing Activities	'	'
Proceeds from sales of available-for-sale investment securities	766	1,753
Proceeds from maturities of held-to-maturity investment securities	6,854	4,005
Proceeds from maturities of available-for-sale investment securities	8,395	11,664
Purchases of held-to-maturity investment securities	-9,439	-8,003
Purchases of available-for-sale investment securities	-9,381	-12,065
Net increase in loans outstanding	-8,495	-9,518
Proceeds from sales of loans	620	1,614
Purchases of loans	-1,883	-2,139
Acquisitions, net of cash acquired	'	94
Other, net	-100	-668
Net cash used in investing activities	-12,663	-13,263
Financing Activities	'	'
Net increase in deposits	12,533	13,099
Net decrease in short-term borrowings	-174	-2,616
Proceeds from issuance of long-term debt	198	4,553
Principal payments or redemption of long-term debt	-2,380	-10,271
Proceeds from issuance of preferred stock	487	2,163
Proceeds from issuance of common stock	331	342
Redemption of preferred stock	-500	'
Repurchase of common stock	-1,779	-1,343
Cash dividends paid on preferred stock	-193	-139
Cash dividends paid on common stock	-1,154	-980
Net cash provided by financing activities	7,369	4,808
Change in cash and due from banks	3,363	-4,580
Cash and due from banks at beginning of period	8,252	13,962
Cash and due from banks at end of period	$11,615	$9,382

Basis_of_Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Basis of Presentation	'
	Note 1	Basis of Presentation
	The accompanying consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and, therefore, do not include all information and notes necessary for a complete presentation of financial position, results of operations and cash flow activity required in accordance with accounting principles generally accepted in the United States. In the opinion of management of U.S. Bancorp (the “Company”), all adjustments (consisting only of normal recurring adjustments) necessary for a fair statement of results for the interim periods have been made. These financial statements and notes should be read in conjunction with the consolidated financial statements and notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2012. Certain amounts in prior periods have been reclassified to conform to the current presentation.
	Accounting policies for the lines of business are generally the same as those used in preparation of the consolidated financial statements with respect to activities specifically attributable to each business line. However, the preparation of business line results requires management to establish methodologies to allocate funding costs, expenses and other financial elements to each line of business. Table 10 “Line of Business Financial Performance” included in Management’s Discussion and Analysis provides details of segment results. This information is incorporated by reference into these Notes to Consolidated Financial Statements.

Investment_Securities

Investment Securities	9 Months Ended
	Sep. 30, 2013
Investments Debt And Equity Securities [Abstract]	'
Investment Securities	'
	Note 2		Investment Securities
	The amortized cost, other-than-temporary impairment recorded in other comprehensive income (loss), gross unrealized holding gains and losses, and fair value of held-to-maturity and available-for-sale investment securities were as follows:
			30-Sep-13																				31-Dec-12
											Unrealized Losses																		Unrealized Losses
	(Dollars in Millions)		Amortized				Unrealized				Other-than-				Other (f)				Fair				Amortized				Unrealized		Other-than-			Other (f)			Fair
			Cost				Gains				Temporary (e)								Value				Cost				Gains		Temporary (e)						Value
	Held-to-maturity (a)
	U.S. Treasury and agencies		$	3,368			$	9			$	–			$	(60	)		$	3,317			$	3,154			$	27	$	–		$	–		$	3,181
	Mortgage-backed securities
	Residential
	Agency			33,378				234				–				(454	)			33,158				31,064				545		–			(6	)		31,603
	Non-agency non-prime (d)			1				–				–				–				1				1				–		–			–			1
	Commercial non-agency			1				–				–				–				1				2				–		–			–			2
	Asset-backed securities
	Collateralized debt obligations/Collateralized loan obligations			2				9				–				–				11				7				15		–			–			22
	Other			16				4				(1	)			(1	)			18				19				2		(3	)		(1	)		17
	Obligations of state and political subdivisions			17				–				–				–				17				20				1		–			–			21
	Obligations of foreign governments			7				–				–				–				7				7				–		–			–			7
	Other debt securities			114				–				–				(12	)			102				115				–		–			(17	)		98
	Total held-to-maturity		$	36,904			$	256			$	(1	)		$	(527	)		$	36,632			$	34,389			$	590	$	(3	)	$	(24	)	$	34,952
	Available-for-sale (b)
	U.S. Treasury and agencies		$	1,567			$	5			$	–			$	(51	)		$	1,521			$	1,211			$	16	$	–		$	(1	)	$	1,226
	Mortgage-backed securities
	Residential
	Agency			29,136				476				–				(392	)			29,220				28,754				746		–			(5	)		29,495
	Non-agency
	Prime (c)			513				2				(10	)			(5	)			500				641				3		(16	)		(4	)		624
	Non-prime (d)			307				3				(6	)			(1	)			303				372				4		(20	)		(1	)		355
	Commercial agency			165				4				–				–				169				185				8		–			–			193
	Asset-backed securities
	Collateralized debt obligations/Collateralized loan obligations			20				5				–				–				25				32				10		–			–			42
	Other			598				13				–				(1	)			610				579				14		–			(1	)		592
	Obligations of state and political subdivisions			5,732				134				–				(46	)			5,820				6,059				396		–			–			6,455
	Obligations of foreign governments			6				–				–				–				6				6				–		–			–			6
	Corporate debt securities			734				–				–				(92	)			642				814				2		–			(85	)		731
	Perpetual preferred securities			205				24				–				(20	)			209				205				27		–			(14	)		218
	Other investments			257				25				–				–				282				182				20		–			–			202
	Total available-for-sale		$	39,240			$	691			$	(16	)		$	(608	)		$	39,307			$	39,040			$	1,246	$	(36	)	$	(111	)	$	40,139
	(a)	Held-to-maturity investment securities are carried at historical cost or at fair value at the time of transfer from the available-for-sale to held-to-maturity category, adjusted for amortization of premiums and accretion of discounts and credit-related other-than-temporary impairment.
	(b)	Available-for-sale investment securities are carried at fair value with unrealized net gains or losses reported within accumulated other comprehensive income (loss) in shareholders’ equity.
	(c)	Prime securities are those designated as such by the issuer at origination. When an issuer designation is unavailable, the Company determines at acquisition date the categorization based on asset pool characteristics (such as weighted-average credit score, loan-to-value, loan type, prevalence of low documentation loans) and deal performance (such as pool delinquencies and security market spreads). When the Company determines the designation, prime securities typically have a weighted average credit score of 725 or higher and a loan-to-value of 80 percent or lower; however, other pool characteristics may result in designations that deviate from these credit score and loan-to-value thresholds.
	(d)	Includes all securities not meeting the conditions to be designated as prime.
	(e)	Represents impairment not related to credit for those investment securities that have been determined to be other-than-temporarily impaired.
	(f)	Represents unrealized losses on investment securities that have not been determined to be other-than-temporarily impaired.
	The weighted-average maturity of the available-for-sale investment securities was 5.5 years at September 30, 2013, compared with 4.1 years at December 31, 2012. The corresponding weighted-average yields were 2.70 percent and 2.93 percent, respectively. The weighted-average maturity of the held-to-maturity investment securities was 4.2 years at September 30, 2013, and 3.3 years at December 31, 2012. The corresponding weighted-average yields were 1.97 percent and 1.94 percent, respectively.
	For amortized cost, fair value and yield by maturity date of held-to-maturity and available-for-sale investment securities outstanding at September 30, 2013, refer to Table 4 included in Management’s Discussion and Analysis which is incorporated by reference into these Notes to Consolidated Financial Statements.
	Investment securities with a fair value of $15.5 billion at September 30, 2013, and $20.1 billion at December 31, 2012, were pledged to secure public, private and trust deposits, repurchase agreements and for other purposes required by contractual obligation or law. Included in these amounts were securities where the Company and certain counterparties have agreements granting the counterparties the right to sell or pledge the securities. Investment securities delivered under these types of arrangements had a fair value of $2.0 billion at September 30, 2013, and $3.5 billion at December 31, 2012.
	The following table provides information about the amount of interest income from taxable and non-taxable investment securities:
			Three Months Ended								Nine Months Ended
			September 30,								September 30,
	(Dollars in Millions)		2013				2012				2013				2012
	Taxable		$	357			$	369			$	1,029			$	1,166
	Non-taxable			63				69				193				210
	Total interest income from investment securities		$	420			$	438			$	1,222			$	1,376
	The following table provides information about the amount of gross gains and losses realized through the sales of available-for-sale investment securities:
			Three Months Ended								Nine Months Ended
			September 30,								September 30,
	(Dollars in Millions)		2013				2012				2013				2012
	Realized gains		$	–			$	115			$	21			$	145
	Realized losses			–				(99	)			–				(99	)
	Net realized gains (losses)		$	–			$	16			$	21			$	46
	Income tax (benefit) on net realized gains (losses)		$	–			$	7			$	8			$	18
	The Company conducts a regular assessment of its investment securities with unrealized losses to determine whether investment securities are other-than-temporarily impaired considering, among other factors, the nature of the investment securities, credit ratings or financial condition of the issuer, the extent and duration of the unrealized loss, expected cash flows of underlying collateral, the existence of any government or agency guarantees, market conditions and whether the Company intends to sell or it is more likely than not the Company will be required to sell the investment securities.
The following tables summarize other-than-temporary impairment by investment category:
		2013														2012
Three Months Ended September 30				Losses				Other Gains				Total				Losses				Other Gains				Total
(Dollars in Millions)				Recorded in				(Losses) (c)								Recorded in				(Losses) (c)
				Earnings												Earnings
Available-for-sale
Mortgage-backed securities
Non-agency residential
Prime (a)				$	(1	)		$	–			$	(1	)		$	(5	)		$	(3	)		$	(8	)
Non-prime (b)					(2	)			1				(1	)			(10	)			5				(5	)
Total available-for-sale				$	(3	)		$	1			$	(2	)		$	(15	)		$	2			$	(13	)
(a)	Prime securities are those designated as such by the issuer at origination. When an issuer designation is unavailable, the Company determines at acquisition date the categorization based on asset pool characteristics (such as weighted-average credit score, loan-to-value, loan type, prevalence of low documentation loans) and deal performance (such as pool delinquencies and security market spreads).
(b)	Includes all securities not meeting the conditions to be designated as prime.
(c)	Losses represent the non-credit portion of other-than-temporary impairment recorded in other comprehensive income (loss) for investment securities determined to be other-than-temporarily impaired during the period. Gains represent recoveries in the fair value of securities that had non-credit other-than-temporary impairment during the period.
		2013														2012
Nine Months Ended September 30				Losses				Other Gains				Total				Losses				Other Gains				Total
(Dollars in Millions)				Recorded in				(Losses) (c)								Recorded in				(Losses) (c)
				Earnings												Earnings
Available-for-sale
Mortgage-backed securities
Non-agency residential
Prime (a)				$	(5	)		$	2			$	(3	)		$	(8	)		$	(12	)		$	(20	)
Non-prime (b)					(8	)			6				(2	)			(27	)			15				(12	)
Commercial non-agency					–				–				–				(1	)			(1	)			(2	)
Other asset-backed securities					–				–				–				(1	)			1				–
Perpetual preferred securities					–				–				–				(27	)			–				(27	)
Total available-for-sale				$	(13	)		$	8			$	(5	)		$	(64	)		$	3			$	(61	)
(a)	Prime securities are those designated as such by the issuer at origination. When an issuer designation is unavailable, the Company determines at acquisition date the categorization based on asset pool characteristics (such as weighted-average credit score, loan-to-value, loan type, prevalence of low documentation loans) and deal performance (such as pool delinquencies and security market spreads).
(b)	Includes all securities not meeting the conditions to be designated as prime.
(c)	Losses represent the non-credit portion of other-than-temporary impairment recorded in other comprehensive income (loss) for investment securities determined to be other-than-temporarily impaired during the period. Gains represent recoveries in the fair value of securities that had non-credit other-than-temporary impairment during the period.
The Company determined the other-than-temporary impairment recorded in earnings for debt securities not intended to be sold by estimating the future cash flows of each individual investment security, using market information where available, and discounting the cash flows at the original effective rate of the investment security. Other-than-temporary impairment recorded in other comprehensive income (loss) was measured as the difference between that discounted amount and the fair value of each investment security. For perpetual preferred securities determined to be other-than-temporarily impaired, the Company recorded a loss in earnings for the entire difference between the securities’ fair value and their amortized cost.
The following table includes the ranges for principal assumptions used for those available-for-sale non-agency mortgage-backed securities determined to be other-than-temporarily impaired:
		Prime (a)												Non-Prime (b)
		Minimum				Maximum				Average				Minimum				Maximum				Average
30-Sep-13
Estimated lifetime prepayment rates			12	%			18	%			13	%			4	%			10	%			6	%
Lifetime probability of default rates			3				5				4				5				10				7
Lifetime loss severity rates			25				50				48				15				60				51
31-Dec-12
Estimated lifetime prepayment rates			6	%			22	%			14	%			3	%			10	%			6	%
Lifetime probability of default rates			3				6				4				3				10				7
Lifetime loss severity rates			40				50				47				45				65				56
(a)	Prime securities are those designated as such by the issuer at origination. When an issuer designation is unavailable, the Company determines at acquisition date the categorization based on asset pool characteristics (such as weighted-average credit score, loan-to-value, loan type, prevalence of low documentation loans) and deal performance (such as pool delinquencies and security market spreads).
(b)	Includes all securities not meeting the conditions to be designated as prime.
Changes in the credit losses on debt securities (excluding perpetual preferred securities) are summarized as follows:
		Three Months Ended								Nine Months Ended
		September 30,								September 30,
(Dollars in Millions)		2013				2012				2013				2012
Balance at beginning of period		$	124			$	277			$	134			$	298
Additions to Credit Losses Due to Other-than-temporary Impairments
Credit losses on securities not previously considered other-than-temporarily impaired			–				2				–				5
Decreases in expected cash flows on securities for which other-than-temporary impairment was previously recognized			3				13				13				32
Total other-than-temporary impairment on debt securities			3				15				13				37
Other Changes in Credit Losses
Increases in expected cash flows			(1	)			–				(2	)			(14	)
Realized losses (a)			(4	)			(4	)			(18	)			(33	)
Credit losses on security sales and securities expected to be sold			–				(142	)			(5	)			(142	)
Balance at end of period		$	122			$	146			$	122			$	146
(a)	Primarily represents principal losses allocated to mortgage and asset-backed securities in the Company’s portfolio under the terms of the securitization transaction documents.
At September 30, 2013, certain investment securities had a fair value below amortized cost. The following table shows the gross unrealized losses and fair value of the Company’s investment securities with unrealized losses, aggregated by investment category and length of time the individual investment securities have been in continuous unrealized loss positions, at September 30, 2013:
		Less Than 12 Months								12 Months or Greater								Total
(Dollars in Millions)		Fair				Unrealized				Fair				Unrealized				Fair				Unrealized
		Value				Losses				Value				Losses				Value				Losses
Held-to-maturity
U.S. Treasury and agencies		$	1,056			$	(60	)		$	–			$	–			$	1,056			$	(60	)
Mortgage-backed securities
Residential agency			20,034				(452	)			85				(2	)			20,119				(454	)
Commercial non-agency			1				–				–				–				1				–
Other asset-backed securities			–				–				10				(2	)			10				(2	)
Obligations of state and political subdivisions			8				–				–				–				8				–
Other debt securities			–				–				13				(12	)			13				(12	)
Total held-to-maturity		$	21,099			$	(512	)		$	108			$	(16	)		$	21,207			$	(528	)
Available-for-sale
U.S. Treasury and agencies		$	853			$	(51	)		$	–			$	–			$	853			$	(51	)
Mortgage-backed securities
Residential
Agency			13,540				(389	)			343				(3	)			13,883				(392	)
Non-agency (a)
Prime (b)			137				(2	)			206				(13	)			343				(15	)
Non-prime (c)			128				(2	)			81				(5	)			209				(7	)
Commercial agency			61				–				–				–				61				–
Other asset-backed securities			25				(1	)			3				–				28				(1	)
Obligations of state and political subdivisions			1,382				(46	)			10				–				1,392				(46	)
Corporate debt securities			214				(5	)			420				(87	)			634				(92	)
Perpetual preferred securities			–				–				112				(20	)			112				(20	)
Total available-for-sale		$	16,340			$	(496	)		$	1,175			$	(128	)		$	17,515			$	(624	)
(a)	The Company has $22 million of unrealized losses on residential non-agency mortgage-backed securities. Credit-related other-than-temporary impairment on these securities may occur if there is further deterioration in the underlying collateral pool performance. Borrower defaults may increase if economic conditions worsen. Additionally, deterioration in home prices may increase the severity of projected losses.
(b)	Prime securities are those designated as such by the issuer at origination. When an issuer designation is unavailable, the Company determines at acquisition date the categorization based on asset pool characteristics (such as weighted-average credit score, loan-to-value, loan type, prevalence of low documentation loans) and deal performance (such as pool delinquencies and security market spreads).
(c)	Includes all securities not meeting the conditions to be designated as prime.
The Company does not consider these unrealized losses to be credit-related. These unrealized losses primarily relate to changes in interest rates and market spreads subsequent to purchase. A substantial portion of investment securities that have unrealized losses are either corporate debt issued with high investment grade credit ratings or agency mortgage-backed securities. In general, the issuers of the investment securities are contractually prohibited from prepayment at less than par, and the Company did not pay significant purchase premiums for these investment securities. At September 30, 2013, the Company had no plans to sell investment securities with unrealized losses, and believes it is more likely than not it would not be required to sell such investment securities before recovery of their amortized cost.

Loans_and_Allowance_for_Credit

Loans and Allowance for Credit Losses	9 Months Ended
	Sep. 30, 2013
Receivables [Abstract]	'
Loans and Allowance for Credit Losses	'
	Note 3		Loans and Allowance for Credit Losses
	The composition of the loan portfolio, disaggregated by class and underlying specific portfolio type, was as follows:
			30-Sep-13						31-Dec-12
	(Dollars in Millions)		Amount			Percent			Amount			Percent
						of Total						of Total
	Commercial
	Commercial		$	63,696			27.5	%	$	60,742			27.2	%
	Lease financing			5,262			2.3			5,481			2.5
	Total commercial			68,958			29.8			66,223			29.7
	Commercial Real Estate
	Commercial mortgages			31,467			13.6			31,005			13.9
	Construction and development			7,211			3.1			5,948			2.6
	Total commercial real estate			38,678			16.7			36,953			16.5
	Residential Mortgages
	Residential mortgages			36,484			15.8			32,648			14.6
	Home equity loans, first liens			13,686			5.9			11,370			5.1
	Total residential mortgages			50,170			21.7			44,018			19.7
	Credit Card			17,063			7.4			17,115			7.7
	Other Retail
	Retail leasing			5,761			2.5			5,419			2.4
	Home equity and second mortgages			15,544			6.7			16,726			7.5
	Revolving credit			3,289			1.4			3,332			1.5
	Installment			5,717			2.4			5,463			2.4
	Automobile			13,130			5.7			12,593			5.6
	Student			3,673			1.6			4,179			1.9
	Total other retail			47,114			20.3			47,712			21.3
	Total loans, excluding covered loans			221,983			95.9			212,021			94.9
	Covered Loans			9,396			4.1			11,308			5.1
	Total loans		$	231,379			100	%	$	223,329			100	%
	The Company had loans of $75.3 billion at September 30, 2013, and $74.1 billion at December 31, 2012, pledged at the Federal Home Loan Bank (“FHLB”), and loans of $51.6 billion at September 30, 2013, and $48.6 billion at December 31, 2012, pledged at the Federal Reserve Bank.
	Originated loans are reported at the principal amount outstanding, net of unearned interest and deferred fees and costs. Net unearned interest and deferred fees and costs amounted to $539 million at September 30, 2013, and $753 million at December 31, 2012. All purchased loans and related indemnification assets are recorded at fair value at the date of purchase. The Company evaluates purchased loans for impairment at the date of purchase in accordance with applicable authoritative accounting guidance. Purchased loans with evidence of credit deterioration since origination for which it is probable that all contractually required payments will not be collected are considered “purchased impaired loans.” All other purchased loans are considered “purchased nonimpaired loans.”
	Changes in the accretable balance for purchased impaired loans were as follows:
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
	(Dollars in Millions)		2013			2012			2013			2012
	Balance at beginning of period		$	1,802		$	2,431		$	1,709		$	2,619
	Purchases			–			–			–			13
	Accretion			(119	)		(109	)		(380	)		(337	)
	Disposals			(51	)		(37	)		(120	)		(135	)
	Reclassifications (to)/from nonaccretable difference (a)			119			58			177			191
	Other (b)			–			(14	)		365			(22	)
	Balance at end of period		$	1,751		$	2,329		$	1,751		$	2,329
	(a)	Primarily relates to changes in expected credit performance.
	(b)	The amount for the nine months ended September 30, 2013, primarily represents the reclassification of unamortized decreases in the FDIC asset (which are now presented as a separate component within the covered assets table on page 55), partially offset by the impact of changes in expectations about retaining covered single-family loans beyond the term of the indemnification agreements.
	Allowance for Credit Losses The allowance for credit losses reserves for probable and estimable losses incurred in the Company’s loan and lease portfolio and includes certain amounts that do not represent loss exposure to the Company because those losses are recoverable under loss sharing agreements with the Federal Deposit Insurance Corporation (“FDIC”). The allowance for credit losses is increased through provisions charged to operating earnings and reduced by net charge-offs. Management evaluates the allowance each quarter to ensure it appropriately reserves for incurred losses.
	The allowance recorded for loans in the commercial lending segment is based on reviews of individual credit relationships and considers the migration analysis of commercial lending segment loans and actual loss experience. In the migration analysis applied to risk rated loan portfolios, the Company currently uses a 12-year period of historical losses in considering actual loss experience, because it believes that period best reflects the losses incurred in the portfolio. This timeframe and the results of the analysis are evaluated quarterly to determine if they are appropriate. The allowance recorded for impaired loans greater than $5 million in the commercial lending segment is based on an individual loan analysis utilizing expected cash flows discounted using the original effective interest rate, the observable market price of the loan, or the fair value of the collateral for collateral-dependent loans, rather than the migration analysis. The allowance recorded for all other commercial lending segment loans is determined on a homogenous pool basis and includes consideration of product mix, risk characteristics of the portfolio, bankruptcy experience, portfolio growth and historical losses, adjusted for current trends. The Company also considers the impacts of any loan modifications made to commercial lending segment loans and any subsequent payment defaults to its expectations of cash flows, principal balance, and current expectations about the borrower’s ability to pay in determining the allowance for credit losses.
	The allowance recorded for Troubled Debt Restructuring (“TDR”) loans and purchased impaired loans in the consumer lending segment is determined on a homogenous pool basis utilizing expected cash flows discounted using the original effective interest rate of the pool, or the prior quarter effective rate, respectively. The allowance for collateral-dependent loans in the consumer lending segment is determined based on the fair value of the collateral less costs to sell. The allowance recorded for all other consumer lending segment loans is determined on a homogenous pool basis and includes consideration of product mix, risk characteristics of the portfolio, bankruptcy experience, delinquency status, refreshed loan-to-value ratios when possible, portfolio growth and historical losses, adjusted for current trends. The Company also considers any modifications made to consumer lending segment loans including the impacts of any subsequent payment defaults since modification in determining the allowance for credit losses, such as the borrower’s ability to pay under the restructured terms, and the timing and amount of payments.
	The allowance for the covered loan segment is evaluated each quarter in a manner similar to that described for non-covered loans and represents any decreases in expected cash flows of those loans after the acquisition date. The provision for credit losses for covered loans considers the indemnification provided by the FDIC.
	In addition, subsequent payment defaults on loan modifications considered TDRs are considered in the underlying factors used in the determination of the appropriateness of the allowance for credit losses. For each loan segment, the Company estimates future loan charge-offs through a variety of analysis, trends and underlying assumptions. With respect to the commercial lending segment, TDRs may be collectively evaluated for impairment where observed performance history, including defaults, is a primary driver of the loss allocation. For commercial TDRs individually evaluated for impairment, attributes of the borrower are the primary factors in determining the allowance for credit losses. However, incorporation of loss history is factored into the allowance methodology applied to this category of loans. With respect to the consumer lending segment, performance of the portfolio, including defaults on TDRs, is considered when estimating future cash flows.
	The Company’s methodology for determining the appropriate allowance for credit losses for all the loan segments also considers the imprecision inherent in the methodologies used. As a result, in addition to the amounts determined under the methodologies described above, management also considers the potential impact of other qualitative factors which include, but are not limited to, economic factors; geographic and other concentration risks; delinquency and nonaccrual trends; current business conditions; changes in lending policy, underwriting standards, internal review and other relevant business practices; and the regulatory environment. The consideration of these items results in adjustments to allowance amounts included in the Company’s allowance for credit losses for each of the above loan segments.
	The Company also assesses the credit risk associated with off-balance sheet loan commitments, letters of credit, and derivatives. Credit risk associated with derivatives is reflected in the fair values recorded for those positions. The liability for off-balance sheet credit exposure related to loan commitments and other credit guarantees is included in other liabilities. Because business processes and credit risks associated with unfunded credit commitments are essentially the same as for loans, the Company utilizes similar processes to estimate its liability for unfunded credit commitments.
	Activity in the allowance for credit losses by portfolio class was as follows:
	Three Months Ended September 30		Commercial			Commercial			Residential			Credit			Other			Total Loans,			Covered			Total
	(Dollars in Millions)					Real Estate			Mortgages			Card			Retail			Excluding			Loans			Loans
																		Covered
																		Loans
	2013
	Balance at beginning of period		$	1,023		$	777		$	921		$	874		$	838		$	4,433		$	179		$	4,612
	Add
	Provision for credit losses			19			(22	)		70			151			84			302			(4	)		298
	Deduct
	Loans charged off			65			17			62			175			122			441			9			450
	Less recoveries of loans charged off			(54	)		(23	)		(5	)		(15	)		(24	)		(121	)		(1	)		(122	)
Net loans charged off			11			(6	)		57			160			98			320			8			328
Other changes (a)			–			–			–			–			–			–			(4	)		(4	)
Balance at end of period		$	1,031		$	761		$	934		$	865		$	824		$	4,415		$	163		$	4,578
2012
Balance at beginning of period		$	1,037		$	941		$	939		$	996		$	828		$	4,741		$	123		$	4,864
Add
Provision for credit losses			63			(22	)		143			119			185			488			–			488
Deduct
Loans charged off			90			47			127			186			187			637			2			639
Less recoveries of loans charged off			(24	)		(22	)		(6	)		(19	)		(30	)		(101	)		–			(101	)
Net loans charged off			66			25			121			167			157			536			2			538
Other changes (a)			–			–			–			(33	)		–			(33	)		(10	)		(43	)
Balance at end of period		$	1,034		$	894		$	961		$	915		$	856		$	4,660		$	111		$	4,771
(a)	Includes net changes in credit losses to be reimbursed by the FDIC and for the three months ended September 30, 2013, reductions in the allowance for covered loans where the reversal of a previously recorded allowance was offset by an associated decrease in the indemnification asset.
Nine Months Ended September 30		Commercial			Commercial			Residential			Credit			Other			Total Loans,			Covered			Total
(Dollars in Millions)					Real Estate			Mortgages			Card			Retail			Excluding			Loans			Loans
																	Covered
																	Loans
2013
Balance at beginning of period		$	1,051		$	857		$	935		$	863		$	848		$	4,554		$	179		$	4,733
Add
Provision for credit losses			64			(100	)		222			495			305			986			77			1,063
Deduct
Loans charged off			184			76			243			559			412			1,474			31			1,505
Less recoveries of loans charged off			(100	)		(80	)		(20	)		(66	)		(83	)		(349	)		(3	)		(352	)
Net loans charged off			84			(4	)		223			493			329			1,125			28			1,153
Other changes (a)			–			–			–			–			–			–			(65	)		(65	)
Balance at end of period		$	1,031		$	761		$	934		$	865		$	824		$	4,415		$	163		$	4,578
2012
Balance at beginning of period		$	1,010		$	1,154		$	927		$	992		$	831		$	4,914		$	100		$	5,014
Add
Provision for credit losses			247			(111	)		376			462			431			1,405			34			1,439
Deduct
Loans charged off			296			206			357			585			503			1,947			4			1,951
Less recoveries of loans charged off			(73	)		(57	)		(15	)		(79	)		(97	)		(321	)		(1	)		(322	)
Net loans charged off			223			149			342			506			406			1,626			3			1,629
Other changes (a)			–			–			–			(33	)		–			(33	)		(20	)		(53	)
Balance at end of period		$	1,034		$	894		$	961		$	915		$	856		$	4,660		$	111		$	4,771
(a)	Includes net changes in credit losses to be reimbursed by the FDIC and for the nine months ended September 30, 2013, reductions in the allowance for covered loans where the reversal of a previously recorded allowance was offset by an associated decrease in the indemnification asset.
Additional detail of the allowance for credit losses by portfolio class was as follows:
(Dollars in Millions)		Commercial			Commercial			Residential			Credit			Other			Total Loans,			Covered			Total
					Real Estate			Mortgages			Card			Retail			Excluding			Loans			Loans
																	Covered
																	Loans
Allowance Balance at September 30, 2013 Related to
Loans individually evaluated for impairment (a)		$	9		$	7		$	–		$	–		$	–		$	16		$	–		$	16
TDRs collectively evaluated for impairment			21			21			341			101			83			567			5			572
Other loans collectively evaluated for impairment			1,001			719			593			764			741			3,818			10			3,828
Loans acquired with deteriorated credit quality			–			14			–			–			–			14			148			162
Total allowance for credit losses		$	1,031		$	761		$	934		$	865		$	824		$	4,415		$	163		$	4,578
Allowance Balance at December 31, 2012 Related to
Loans individually evaluated for impairment (a)		$	10		$	30		$	–		$	–		$	–		$	40		$	–		$	40
TDRs collectively evaluated for impairment			28			29			446			153			97			753			1			754
Other loans collectively evaluated for impairment			1,013			791			489			710			751			3,754			17			3,771
Loans acquired with deteriorated credit quality			–			7			–			–			–			7			161			168
Total allowance for credit losses		$	1,051		$	857		$	935		$	863		$	848		$	4,554		$	179		$	4,733
(a)	Represents the allowance for credit losses related to loans greater than $5 million classified as nonperforming or TDRs.
Additional detail of loan balances by portfolio class was as follows:
(Dollars in Millions)		Commercial			Commercial			Residential			Credit			Other			Total Loans,			Covered			Total
					Real Estate			Mortgages			Card			Retail			Excluding			Loans (b)			Loans
																	Covered
																	Loans
30-Sep-13
Loans individually evaluated for impairment (a)		$	171		$	253		$	–		$	–		$	–		$	424		$	48		$	472
TDRs collectively evaluated for impairment			171			360			4,357			335			281			5,504			100			5,604
Other loans collectively evaluated for impairment			68,615			37,979			45,812			16,728			46,833			215,967			5,172			221,139
Loans acquired with deteriorated credit quality			1			86			1			–			–			88			4,076			4,164
Total loans		$	68,958		$	38,678		$	50,170		$	17,063		$	47,114		$	221,983		$	9,396		$	231,379
31-Dec-12
Loans individually evaluated for impairment (a)		$	171		$	510		$	–		$	–		$	–		$	681		$	48		$	729
TDRs collectively evaluated for impairment			185			391			4,199			442			313			5,530			145			5,675
Other loans collectively evaluated for impairment			65,863			35,952			39,813			16,673			47,399			205,700			5,814			211,514
Loans acquired with deteriorated credit quality			4			100			6			–			–			110			5,301			5,411
Total loans		$	66,223		$	36,953		$	44,018		$	17,115		$	47,712		$	212,021		$	11,308		$	223,329
(a)	Represents loans greater than $5 million classified as nonperforming or TDRs.
(b)	Includes expected reimbursements from the FDIC under loss sharing agreements.
Credit Quality The quality of the Company’s loan portfolios is assessed as a function of net credit losses, levels of nonperforming assets and delinquencies, and credit quality ratings as defined by the Company.
For all loan classes, loans are considered past due based on the number of days delinquent except for monthly amortizing loans which are classified delinquent based upon the number of contractually required payments not made (for example, two missed payments is considered 30 days delinquent). When a loan is placed on nonaccrual status, unpaid accrued interest is reversed.
Commercial lending segment loans are generally placed on nonaccrual status when the collection of principal and interest has become 90 days past due or is otherwise considered doubtful. Commercial lending segment loans are generally fully or partially charged down to the fair value of the collateral securing the loan, less costs to sell, when the loan is considered uncollectible.
Consumer lending segment loans are generally charged-off at a specific number of days or payments past due. Residential mortgages and other retail loans secured by 1-4 family properties are generally charged down to the fair value of the collateral securing the loan, less costs to sell, at 180 days past due, and placed on nonaccrual status in instances where a partial charge-off occurs unless the loan is well secured and in the process of collection. Loans and lines in a junior lien position secured by 1-4 family properties are placed on nonaccrual status at 120 days past due or when behind a first lien that has become 180 days or greater past due or placed on nonaccrual status. Any secured consumer lending segment loan whose borrower has had debt discharged through bankruptcy, for which the loan amount exceeds the fair value of the collateral, is charged down to the fair value of the related collateral and the remaining balance is placed on nonaccrual status. Credit card loans continue to accrue interest until the account is charged off. Credit cards are charged off at 180 days past due. Other retail loans not secured by 1-4 family properties are charged-off at 120 days past due; and revolving consumer lines are charged off at 180 days past due. Similar to credit cards, other retail loans are generally not placed on nonaccrual status because of the relative short period of time to charge-off. Certain retail customers having financial difficulties may have the terms of their credit card and other loan agreements modified to require only principal payments and, as such, are reported as nonaccrual.
For all loan classes, interest payments received on nonaccrual loans are generally recorded as a reduction to the loan carrying amount. Interest payments are generally recorded as reductions to a loan’s carrying amount while a loan is on nonaccrual and are recognized as interest income upon payoff of the loan. Interest income may be recognized for interest payments if the remaining carrying amount of the loan is believed to be collectible. In certain circumstances, loans in any class may be restored to accrual status, such as when a loan has demonstrated sustained repayment performance or no amounts are past due and prospects for future payment are no longer in doubt; or the loan becomes well secured and is in the process of collection. Loans where there has been a partial charge-off may be returned to accrual status if all principal and interest (including amounts previously charged-off) is expected to be collected and the loan is current.
Covered loans not considered to be purchased impaired are evaluated for delinquency, nonaccrual status and charge-off consistent with the class of loan they would be included in had the loss share coverage not been in place. Generally, purchased impaired loans are considered accruing loans. However, the timing and amount of future cash flows for some loans is not reasonably estimable. Those loans are classified as nonaccrual loans and interest income is not recognized until the timing and amount of the future cash flows can be reasonably estimated.
The following table provides a summary of loans by portfolio class, including the delinquency status of those that continue to accrue interest, and those that are nonperforming:
		Accruing
(Dollars in Millions)		Current			30-89 Days			90 Days or			Nonperforming			Total
					Past Due			More Past Due
30-Sep-13
Commercial		$	68,573		$	219		$	50		$	116		$	68,958
Commercial real estate			38,253			62			7			356			38,678
Residential mortgages (a)			48,820			350			268			732			50,170
Credit card			16,567			212			190			94			17,063
Other retail			46,598			234			76			206			47,114
Total loans, excluding covered loans			218,811			1,077			591			1,504			221,983
Covered loans			8,584			142			514			156			9,396
Total loans		$	227,395		$	1,219		$	1,105		$	1,660		$	231,379
31-Dec-12
Commercial		$	65,701		$	341		$	58		$	123		$	66,223
Commercial real estate			36,241			158			8			546			36,953
Residential mortgages (a)			42,728			348			281			661			44,018
Credit card			16,525			227			217			146			17,115
Other retail			47,109			290			96			217			47,712
Total loans, excluding covered loans			208,304			1,364			660			1,693			212,021
Covered loans			9,900			359			663			386			11,308
Total loans		$	218,204		$	1,723		$	1,323		$	2,079		$	223,329
(a)	At September 30, 2013, $399 million of loans 30–89 days past due and $3.5 billion of loans 90 days or more past due purchased from Government National Mortgage Association (“GNMA”) mortgage pools whose repayments are insured by the Federal Housing Administration or guaranteed by the Department of Veterans Affairs, were classified as current, compared with $441 million and $3.2 billion at December 31, 2012, respectively.
The Company classifies its loan portfolios using internal credit quality ratings on a quarterly basis. These ratings include: pass, special mention and classified, and are an important part of the Company’s overall credit risk management process and evaluation of the allowance for credit losses. Loans with a pass rating represent those not classified on the Company’s rating scale for problem credits, as minimal credit risk has been identified. Special mention loans are those that have a potential weakness deserving management’s close attention. Classified loans are those where a well-defined weakness has been identified that may put full collection of contractual cash flows at risk. It is possible that others, given the same information, may reach different reasonable conclusions regarding the credit quality rating classification of specific loans.
The following table provides a summary of loans by portfolio class and the Company’s internal credit quality rating:
					Criticized
(Dollars in Millions)		Pass			Special			Classified (a)			Total			Total
					Mention						Criticized
30-Sep-13
Commercial		$	66,791		$	1,103		$	1,064		$	2,167		$	68,958
Commercial real estate			36,796			578			1,304			1,882			38,678
Residential mortgages (b)			49,052			6			1,112			1,118			50,170
Credit card			16,779			–			284			284			17,063
Other retail			46,744			34			336			370			47,114
Total loans, excluding covered loans			216,162			1,721			4,100			5,821			221,983
Covered loans			9,061			39			296			335			9,396
Total loans		$	225,223		$	1,760		$	4,396		$	6,156		$	231,379
Total outstanding commitments		$	460,484		$	3,124		$	5,055		$	8,179		$	468,663
31-Dec-12
Commercial		$	63,906		$	1,114		$	1,203		$	2,317		$	66,223
Commercial real estate			34,096			621			2,236			2,857			36,953
Residential mortgages (b)			42,897			18			1,103			1,121			44,018
Credit card			16,752			–			363			363			17,115
Other retail			47,294			36			382			418			47,712
Total loans, excluding covered loans			204,945			1,789			5,287			7,076			212,021
Covered loans			10,786			61			461			522			11,308
Total loans		$	215,731		$	1,850		$	5,748		$	7,598		$	223,329
Total outstanding commitments		$	442,047		$	3,231		$	6,563		$	9,794		$	451,841
(a)	Classified rating on consumer loans primarily based on delinquency status.
(b)	At September 30, 2013, $3.5 billion of GNMA loans 90 days or more past due and $1.9 billion of restructured GNMA loans whose repayments are insured by the Federal Housing Administration or guaranteed by the Department of Veterans Affairs were classified with a pass rating, compared with $3.2 billion and $2.4 billion at December 31, 2012, respectively.
For all loan classes, a loan is considered to be impaired when, based on current events or information, it is probable the Company will be unable to collect all amounts due per the contractual terms of the loan agreement. Impaired loans include all nonaccrual and TDR loans. For all loan classes, interest income on TDR loans is recognized under the modified terms and conditions if the borrower has demonstrated repayment performance at a level commensurate with the modified terms over several payment cycles. Interest income is generally not recognized on other impaired loans until the loan is paid off. However, interest income may be recognized for interest payments if the remaining carrying amount of the loan is believed to be collectible.
Factors used by the Company in determining whether all principal and interest payments due on commercial and commercial real estate loans will be collected and therefore whether those loans are impaired include, but are not limited to, the financial condition of the borrower, collateral and/or guarantees on the loan, and the borrower’s estimated future ability to pay based on industry, geographic location and certain financial ratios. The evaluation of impairment on residential mortgages, credit card loans and other retail loans is primarily driven by delinquency status of individual loans or whether a loan has been modified, and considers any government guarantee where applicable. Individual covered loans, whose future losses are covered by loss sharing agreements with the FDIC that substantially reduce the risk of credit losses to the Company, are evaluated for impairment and accounted for in a manner consistent with the class of loan they would have been included in had the loss sharing coverage not been in place.
A summary of impaired loans by portfolio class was as follows:
(Dollars in Millions)		Period-end			Unpaid			Valuation			Commitments
		Recorded			Principal			Allowance			to Lend
		Investment (a)			Balance						Additional
											Funds
30-Sep-13
Commercial		$	375		$	857		$	38		$	25
Commercial real estate			721			1,570			36			14
Residential mortgages			2,762			3,404			323			2
Credit card			335			335			101			–
Other retail			408			609			86			3
Total impaired loans, excluding GNMA and covered loans			4,601			6,775			584			44
Loans purchased from GNMA mortgage pools			1,915			1,915			29			–
Covered loans			503			1,186			34			7
Total		$	7,019		$	9,876		$	647		$	51
31-Dec-12
Commercial		$	404		$	1,200		$	40		$	39
Commercial real estate			1,077			2,251			70			4
Residential mortgages			2,748			3,341			415			–
Credit card			442			442			153			–
Other retail			443			486			101			3
Total impaired loans, excluding GNMA and covered loans			5,114			7,720			779			46
Loans purchased from GNMA mortgage pools			1,778			1,778			39			–
Covered loans			767			1,584			20			12
Total		$	7,659		$	11,082		$	838		$	58
(a)	Substantially all loans classified as impaired at September 30, 2013 and December 31, 2012, had an associated allowance for credit losses.
Additional information on impaired loans follows:
		2013						2012
(Dollars in Millions)		Average			Interest			Average			Interest
		Recorded			Income			Recorded			Income
		Investment			Recognized			Investment			Recognized
Three Months Ended September 30
Commercial		$	380		$	5		$	413		$	6
Commercial real estate			819			6			1,250			12
Residential mortgages			2,765			32			2,752			31
Credit card			347			3			495			6
Other retail			417			7			354			3
Total impaired loans, excluding GNMA and covered loans			4,728			53			5,264			58
Loans purchased from GNMA mortgage pools			1,883			22			1,492			20
Covered loans			519			6			883			7
Total		$	7,130		$	81		$	7,639		$	85
Nine Months Ended September 30
Commercial		$	384		$	24		$	496		$	11
Commercial real estate			950			27			1,371			29
Residential mortgages			2,744			99			2,692			87
Credit card			380			12			529			22
Other retail			431			19			259			7
Total impaired loans, excluding GNMA and covered loans			4,889			181			5,347			156
Loans purchased from GNMA mortgage pools			1,869			68			1,363			51
Covered loans			588			21			1,042			20
Total		$	7,346		$	270		$	7,752		$	227
Troubled Debt Restructurings In certain circumstances, the Company may modify the terms of a loan to maximize the collection of amounts due when a borrower is experiencing financial difficulties or is expected to experience difficulties in the near-term. Concessionary modifications are classified as TDRs unless the modification results in only an insignificant delay in payments to be received. The Company recognizes interest on TDRs if the borrower complies with the revised terms and conditions as agreed upon with the Company and has demonstrated repayment performance at a level commensurate with the modified terms over several payment cycles. To the extent a previous restructuring was insignificant, the Company considers the cumulative effect of past restructurings related to the receivable when determining whether a current restructuring is a TDR. Loans classified as TDRs are considered impaired loans for reporting and measurement purposes.
The following table provides a summary of loans modified as TDRs by portfolio class:
		2013									2012
(Dollars in Millions)		Number			Pre-Modification			Post-Modification			Number			Pre-Modification			Post-Modification
		of Loans			Outstanding			Outstanding			of Loans			Outstanding			Outstanding
					Loan			Loan						Loan			Loan
					Balance			Balance						Balance			Balance
Three Months Ended September 30
Commercial			551		$	62		$	60			1,754		$	54		$	58
Commercial real estate			48			76			73			63			91			80
Residential mortgages			338			42			42			2,717			344			336
Credit card			6,447			39			38			14,137			52			67
Other retail			847			21			21			6,231			159			156
Total loans, excluding GNMA and covered loans			8,231			240			234			24,902			700			697
Loans purchased from GNMA mortgage pools			2,315			300			284			4,859			660			589
Covered loans			38			19			11			73			49			46
Total loans			10,584		$	559		$	529			29,834		$	1,409		$	1,332
Nine Months Ended September 30
Commercial			1,962		$	150		$	140			4,081		$	215		$	195
Commercial real estate			147			193			186			245			416			390
Residential mortgages			1,575			214			210			3,788			529			517
Credit card			20,147			122			122			39,040			189			203
Other retail			3,519			86			85			8,028			194			191
Total loans, excluding GNMA and covered loans			27,350			765			743			55,182			1,543			1,496
Loans purchased from GNMA mortgage pools			6,450			822			782			8,436			1,116			1,087
Covered loans			109			85			64			166			246			234
Total loans			33,909		$	1,672		$	1,589			63,784		$	2,905		$	2,817
Residential mortgages, home equity and second mortgages, and loans purchased from Government National Mortgage Association (“GNMA”) mortgage pools in the table above include trial period arrangements offered to customers during the periods presented. The post-modification balances for these loans reflect the current outstanding balance until a permanent modification is made. In addition, the post-modification balances typically include capitalization of unpaid accrued interest and/or fees under the various modification programs. For those loans modified as TDRs during the third quarter of 2013, at September 30, 2013, 142 residential mortgages, 5 home equity and second mortgage loans and 1,905 loans purchased from GNMA mortgage pools with outstanding balances of $18 million, less than $1 million and $247 million, respectively, were in a trial period and have estimated post-modification balances of $16 million, less than $1 million and $231 million, respectively, assuming permanent modification occurs at the end of the trial period.
The Company has implemented certain restructuring programs that may result in TDRs. However, many of the Company’s TDRs are also determined on a case-by-case basis in connection with ongoing loan collection processes.
For the commercial lending segment, modifications generally result in the Company working with borrowers on a case-by-case basis. Commercial and commercial real estate modifications generally include extensions of the maturity date and may be accompanied by an increase or decrease to the interest rate, which may not be deemed a market rate of interest. In addition, the Company may work with the borrower in identifying other changes that mitigate loss to the Company, which may include additional collateral or guarantees to support the loan. To a lesser extent, the Company may waive contractual principal. The Company classifies these concessions as TDRs to the extent the Company determines that the borrower is experiencing financial difficulty.
Modifications for the consumer lending segment are generally part of programs the Company has initiated. The Company participates in the U.S. Department of Treasury Home Affordable Modification Program (“HAMP”). HAMP gives qualifying homeowners an opportunity to permanently modify residential mortgage loans and achieve more affordable monthly payments, with the U.S. Department of Treasury compensating the Company for a portion of the reduction in monthly amounts due from borrowers participating in this program. The Company also modifies residential mortgage loans under Federal Housing Administration, Department of Veterans Affairs, or its own internal programs. Under these programs, the Company provides concessions to qualifying borrowers experiencing financial difficulties. The concessions may include adjustments to interest rates, conversion of adjustable rates to fixed rates, extension of maturity dates or deferrals of payments, capitalization of accrued interest and/or outstanding advances, or in limited situations, partial forgiveness of loan principal. In most instances, participation in residential mortgage loan restructuring programs requires the customer to complete a short-term trial period. A permanent loan modification is contingent on the customer successfully completing the trial period arrangement and the loan documents are not modified until that time. The Company reports loans in a trial period arrangement as TDRs.
Credit card and other retail loan modifications are generally part of two distinct restructuring programs. The Company offers workout programs providing customers experiencing financial difficulty with modifications whereby balances may be amortized up to 60 months, and generally include waiver of fees and reduced interest rates. The Company also provides modification programs to qualifying customers experiencing a temporary financial hardship in which reductions are made to monthly required minimum payments for up to 12 months. Balances related to these programs are generally frozen; however, accounts may be reopened upon successful exit of the program, in which account privileges may be restored.
In addition, the Company considers secured loans to consumer borrowers that have debt discharged through bankruptcy where the borrower has not reaffirmed the debt to be TDRs.
Modifications to loans in the covered segment are similar in nature to that described above for non-covered loans, and the evaluation and determination of TDR status is similar, except that acquired loans restructured after acquisition are not considered TDRs for purposes of the Company’s accounting and disclosure if the loans evidenced credit deterioration as of the acquisition date and are accounted for in pools. Losses associated with the modification on covered loans, including the economic impact of interest rate reductions, are generally eligible for reimbursement under loss sharing agreements with the FDIC.
The following table provides a summary of TDR loans that defaulted (fully or partially charged-off or became 90 days or more past due) during the periods presented that were modified as TDRs within 12 months previous to default:
		2013						2012
(Dollars in Millions)		Number			Amount			Number			Amount
		of Loans			Defaulted			of Loans			Defaulted
Three Months Ended September 30
Commercial			143		$	37			195		$	2
Commercial real estate			30			18			13			12
Residential mortgages			303			41			116			30
Credit card			1,485			8			2,536			14
Other retail			278			10			189			4
Total loans, excluding GNMA and covered loans			2,239			114			3,049			62
Loans purchased from GNMA mortgage pools			492			69			248			34
Covered loans			24			25			8			3
Total loans			2,755		$	208			3,305		$	99
Nine Months Ended September 30
Commercial			483		$	42			652		$	33
Commercial real estate			72			90			96			176
Residential mortgages			673			100			427			64
Credit card			5,109			29			7,452			42
Other retail			1,164			53			531			8
Total loans, excluding GNMA and covered loans			7,501			314			9,158			323
Loans purchased from GNMA mortgage pools			4,795			615			731			106
Covered loans			49			37			49			90
Total loans			12,345		$	966			9,938		$	519
In addition to the defaults in the table above, during the three and nine months ended September 30, 2013, the Company had a total of 135 and 441 of residential mortgage loans, home equity and second mortgage loans and loans purchased from GNMA mortgage pools with aggregate outstanding balances of $18 million and $59 million, respectively, where borrowers did not successfully complete the trial period arrangement and therefore are no longer eligible for a permanent modification under the applicable modification program.
Covered Assets Covered assets represent loans and other assets acquired from the FDIC, subject to loss sharing agreements, and include expected reimbursements from the FDIC. The carrying amount of the covered assets consisted of purchased impaired loans, purchased nonimpaired loans and other assets as shown in the following table:
		30-Sep-13												31-Dec-12
(Dollars in Millions)		Purchased			Purchased			Other			Total			Purchased			Purchased			Other			Total
		Impaired			Nonimpaired			Assets						Impaired			Nonimpaired			Assets
		Loans			Loans									Loans			Loans
Commercial loans		$	–		$	109		$	–		$	109		$	–		$	143		$	–		$	143
Commercial real estate loans			973			1,803			–			2,776			1,323			2,695			–			4,018
Residential mortgage loans			3,103			935			–			4,038			3,978			1,109			–			5,087
Credit card loans			–			5			–			5			–			5			–			5
Other retail loans			–			683			–			683			–			775			–			775
Losses reimbursable by the FDIC (a)			–			–			820			820			–			–			1,280			1,280
Unamortized changes in FDIC asset (b)			–			–			965			965			–			–			–			–
Covered loans			4,076			3,535			1,785			9,396			5,301			4,727			1,280			11,308
Foreclosed real estate			–			–			176			176			–			–			197			197
Total covered assets		$	4,076		$	3,535		$	1,961		$	9,572		$	5,301		$	4,727		$	1,477		$	11,505
(a)	Relates to loss sharing agreements with remaining terms up to six years.
(b)	Represents decreases in expected reimbursements by the FDIC as a result of decreases in expected losses on the covered loans. These amounts are amortized as a reduction in interest income on covered loans over the shorter of the expected life of the respective covered loans or the remaining contractual term of the indemnification agreements. These amounts were presented within the separate loan categories prior to January 1, 2013.
The Company adopted new indemnification asset accounting guidance effective January 1, 2013 applicable to FDIC loss-sharing agreements. The guidance requires any reduction in expected cash flows from the FDIC resulting from increases in expected cash flows from the covered assets (when there are no previous valuation allowances to reverse) to be amortized over the shorter of the remaining contractual term of the indemnification agreements or the remaining life of the covered assets. Prior to adoption of this guidance, such increases in expected cash flows of purchased loans and decreases in expected cash flows of the FDIC indemnification assets were considered together and recognized over the remaining life of the loans. The adoption of this guidance did not materially affect the Company’s financial statements.
At September 30, 2013, $9 million of the purchased impaired loans included in covered loans were classified as nonperforming assets, compared with $82 million at December 31, 2012, because the expected cash flows are primarily based on the liquidation of underlying collateral and the timing and amount of the cash flows could not be reasonably estimated. Interest income is recognized on other purchased impaired loans through accretion of the difference between the carrying amount of those loans and their expected cash flows. The initial determination of the fair value of the purchased loans includes the impact of expected credit losses and, therefore, no allowance for credit losses is recorded at the purchase date. To the extent credit deterioration occurs after the date of acquisition, the Company records an allowance for credit losses.

Accounting_for_Transfers_and_S

Accounting for Transfers and Servicing of Financial Assets and Variable Interest Entities	9 Months Ended
	Sep. 30, 2013
Transfers And Servicing [Abstract]	'
Accounting for Transfers and Servicing of Financial Assets and Variable Interest Entities	'
	Note 4	Accounting for Transfers and Servicing of Financial Assets and Variable Interest Entities
	The Company sells financial assets in the normal course of business. The majority of the Company’s financial asset sales are residential mortgage loan sales primarily to government-sponsored enterprises (“GSEs”) through established programs, the sale or syndication of tax-advantaged investments, commercial loan sales through participation agreements, and other individual or portfolio loan and securities sales. In accordance with the accounting guidance for asset transfers, the Company considers any ongoing involvement with transferred assets in determining whether the assets can be derecognized from the balance sheet. For loans sold under participation agreements, the Company also considers the terms of the loan participation agreement and whether they meet the definition of a participating interest and thus qualify for derecognition. With the exception of servicing and certain performance-based guarantees, the Company’s continuing involvement with financial assets sold is minimal and generally limited to market customary representation and warranty clauses. The guarantees provided to certain third-parties in connection with the sale or syndication of certain assets, primarily loan portfolios and tax-advantaged investments, are further discussed in Note 14. When the Company sells financial assets, it may retain servicing rights and/or other interests in the transferred financial assets. The gain or loss on sale depends on the previous carrying amount of the transferred financial assets and the consideration received and any liabilities incurred in exchange for the transferred assets. Upon transfer, any servicing assets and other interests that continue to be held by the Company are initially recognized at fair value. For further information on mortgage servicing rights (“MSRs”), refer to Note 5. On a limited basis, the Company may acquire and package high-grade corporate bonds for select corporate customers, in which the Company generally has no continuing involvement with these transactions. Additionally, the Company is an authorized GNMA issuer and issues GNMA securities on a regular basis. The Company has no other asset securitizations or similar asset-backed financing arrangements that are off-balance sheet.
	The Company is involved in various entities that are considered to be variable interest entities (“VIEs”). The Company’s investments in VIEs primarily represent private investment funds or partnerships that make equity investments or provide debt financing promoting the development of affordable housing, community development and renewable energy sources. Some of these investments support the Company’s regulatory compliance with the Community Reinvestment Act. In addition, the Company sponsors entities to which it transfers tax-advantaged investments. The Company’s investments in these entities are designed to generate a return primarily through the realization of federal and state income tax credits over specified time periods. The Company realized federal and state income tax credits related to these investments of $441 million and $227 million for the three months ended September 30, 2013, and 2012, respectively, and $981 million and $581 million for the nine months ended September 30, 2013 and 2012, respectively. These tax credits are recognized as a reduction of tax expense or, for certain investments, as a reduction to the related investment asset. The Company also recognized, in its Consolidated Statement of Income, $292 million and $263 million of costs related to these investments for the three months ended September 30, 2013 and 2012, respectively, of which $132 million and $123 million, respectively, was included in tax expense and the remainder was included in noninterest expense. The Company recognized $931 million and $677 million of costs related to these investments for the nine months ended September 30, 2013 and 2012, respectively, of which $512 million and $316 million, respectively, was included in tax expense and the remainder was included in noninterest expense.
	During 2013, the Company transferred its control over the most significant activities of certain consolidated community development and tax-advantaged investment VIEs to a third party manager. The third party manager also has provided a guarantee to these VIEs related to the occurrence of certain tax credit recapture events and, therefore, has an obligation to absorb certain losses that could potentially be significant to the VIEs. Previously, the Company consolidated these VIEs because it had a controlling financial interest in the entities. After the transfer of control to the third party manager, the Company no longer had a controlling financial interest and deconsolidated the VIEs. The deconsolidation resulted in a decrease in both assets and liabilities, primarily other assets and long-term debt, respectively, of approximately $4.6 billion. The deconsolidation and remeasurement of the Company’s investment in these unconsolidated VIEs to fair value did not materially impact the Company’s Consolidated Statement of Income. The total amount of the Company’s investment in the VIEs was $1.0 billion at September 30, 2013 and is reported in other assets.
	At September 30, 2013, approximately $1.8 billion of the Company’s assets and $434 million of its liabilities included on the Consolidated Balance Sheet were related to community development and tax-advantaged investment VIEs which the Company has consolidated, compared with $7.1 billion and $5.2 billion, respectively, at December 31, 2012. The majority of the assets of these consolidated VIEs are reported in other assets, and the liabilities are reported in long-term debt. The assets of a particular VIE are the primary source of funds to settle its obligations. The creditors of the VIEs do not have recourse to the general credit of the Company. The Company’s exposure to the consolidated VIEs is generally limited to the carrying value of its variable interests plus any related tax credits previously recognized or sold to others with a guarantee.
	In addition, the Company sponsors a conduit to which it previously transferred high-grade investment securities. The Company consolidates the conduit because of its ability to manage the activities of the conduit. At September 30, 2013, $134 million of the held-to-maturity investment securities on the Company’s Consolidated Balance Sheet are related to the conduit, compared with $144 million at December 31, 2012.
	The Company also sponsors a municipal bond securities tender option bond program. The Company controls the activities of the program’s entities, is entitled to the residual returns and provides credit, liquidity and remarketing arrangements to the program. As a result, the Company has consolidated the program’s entities. At September 30, 2013, $4.8 billion of available-for-sale securities and $4.7 billion of short-term borrowings on the Consolidated Balance Sheet were related to the tender option bond program, compared with $5.3 billion of available-for-sale securities and $5.0 billion of short-term borrowings at December 31, 2012.
	The Company is not required to consolidate VIEs in which it has concluded it does not have a controlling financial interest, and thus is not the primary beneficiary. In such cases, the Company does not have both the power to direct the entities’ most significant activities and the obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIEs. The Company’s investments in these unconsolidated VIEs generally are carried in other assets on the Consolidated Balance Sheet. The Company’s investments in unconsolidated VIEs at September 30, 2013 ranged from less than $1 million to $40 million, with an aggregate amount of $2.7 billion, net of $1.9 billion of liabilities recorded primarily for unfunded capital commitments of the Company to specific project sponsors. The Company’s investments in unconsolidated VIEs at December 31, 2012, ranged from less than $1 million to $58 million, with an aggregate amount of $1.9 billion, net of liabilities of $1.3 billion recorded primarily for unfunded capital commitments. While the Company believes potential losses from these investments are remote, the Company’s maximum exposure to loss from these unconsolidated VIEs was $7.2 billion at September 30, 2013 and $5.2 billion at December 31, 2012. The maximum exposure to loss was primarily related to community development tax-advantaged investments and included $2.6 billion at September 30, 2013 and $1.8 billion at December 31, 2012, on the Company’s Consolidated Balance Sheet, and $4.5 billion at September 30, 2013 and $3.3 billion at December 31, 2012, of previously recorded tax credits which remain subject to recapture by taxing authorities based on compliance features required to be met at the project level. The remaining amounts related to investments in private investment funds and partnerships for which the maximum exposure to loss included amounts recorded on the Consolidated Balance Sheet and any unfunded commitments. The maximum exposure was determined by assuming a scenario where the separate investments within the individual private funds become worthless, and the community-based business and housing projects and related tax credits completely fail and do not meet certain government compliance requirements.

Mortgage_Servicing_Rights

Mortgage Servicing Rights	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Mortgage Servicing Rights	'
	Note 5		Mortgage Servicing Rights
	The Company serviced $226.7 billion of residential mortgage loans for others at September 30, 2013, and $215.6 billion at December 31, 2012. The net impact included in mortgage banking revenue of fair value changes of MSRs and derivatives used to economically hedge MSRs were net gains of $108 million and $10 million for the three months ended September 30, 2013 and 2012, respectively, and net gains of $163 million and $72 million for the nine months ended September 30, 2013 and 2012, respectively. Loan servicing fees, not including valuation changes, included in mortgage banking revenue, were $192 million and $181 million for the three months ended September 30, 2013 and 2012, respectively, and $566 million and $526 million for the nine months ended September 30, 2013 and 2012, respectively.
	Changes in fair value of capitalized MSRs are summarized as follows:
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
	(Dollars in Millions)		2013			2012			2013			2012
	Balance at beginning of period		$	2,377		$	1,594		$	1,700		$	1,519
	Rights purchased			2			10			7			39
	Rights capitalized			187			224			674			700
	Changes in fair value of MSRs
	Due to fluctuations in market interest rates (a)			71			(123	)		503			(298	)
	Due to revised assumptions or models (b)			42			(2	)		33			(19	)
	Other changes in fair value (c)			(102	)		(150	)		(340	)		(388	)
	Balance at end of period		$	2,577		$	1,553		$	2,577		$	1,553
	(a)	Includes changes in MSR value associated with changes in market interest rates, including estimated prepayment rates and anticipated earnings on escrow deposits.
	(b)	Includes changes in MSR value not caused by changes in market interest rates, such as changes in cost to service, ancillary income, and discount rate, as well as the impact of any model changes.
	(c)	Primarily represents changes due to realization of expected cash flows over time (decay).
	The estimated sensitivity to changes in interest rates of the fair value of the MSRs portfolio and the related derivative instruments was as follows:
			September 30, 2013																		December 31, 2012
	(Dollars in Millions)		Down			Down			Down			Up			Up			Up			Down			Down			Down			Up			Up			Up
			100 bps			50 bps			25 bps			25 bps			50 bps			100 bps			100 bps			50 bps			25 bps			25 bps			50 bps			100 bps
	MSR portfolio		$	(494	)	$	(223	)	$	(107	)	$	92		$	173		$	324		$	(370	)	$	(217	)	$	(118	)	$	126		$	249		$	480
	Derivative instrument hedges			427			211			102			(93	)		(174	)		(317	)		473			249			124			(121	)		(243	)		(486	)
	Net sensitivity		$	(67	)	$	(12	)	$	(5	)	$	(1	)	$	(1	)	$	7		$	103		$	32		$	6		$	5		$	6		$	(6	)
	The fair value of MSRs and their sensitivity to changes in interest rates is influenced by the mix of the servicing portfolio and characteristics of each segment of the portfolio. The Company’s servicing portfolio consists of the distinct portfolios of government-insured mortgages, conventional mortgages and Mortgage Revenue Bond Programs (“MRBP”). The servicing portfolios are predominantly comprised of fixed-rate agency loans with limited adjustable-rate or jumbo mortgage loans. The MRBP division specializes in servicing loans made under state and local housing authority programs. These programs provide mortgages to low-income and moderate-income borrowers and are generally government-insured programs with a favorable rate subsidy, down payment and/or closing cost assistance.
	A summary of the Company’s MSRs and related characteristics by portfolio was as follows:
			September 30, 2013												December 31, 2012
	(Dollars in Millions)		MRBP			Government			Conventional (b)			Total			MRBP			Government			Conventional (b)			Total
	Servicing portfolio		$	15,088		$	41,192		$	170,447		$	226,727		$	14,143		$	39,048		$	162,446		$	215,637
	Fair value		$	171		$	474		$	1,932		$	2,577		$	154		$	314		$	1,232		$	1,700
	Value (bps) (a)			113			115			113			114			109			80			76			79
	Weighted-average servicing fees (bps)			39			32			29			30			40			33			30			31
	Multiple (value/servicing fees)			2.9			3.59			3.9			3.8			2.73			2.42			2.53			2.55
	Weighted-average note rate			4.76	%		4.26	%		4.19	%		4.24	%		5.13	%		4.57	%		4.48	%		4.54	%
	Weighted-average age (in years)			4			2.5			2.4			2.5			4.2			2.4			2.5			2.6
	Weighted-average expected prepayment (constant prepayment rate)			13.1	%		12.6	%		12.2	%		12.3	%		13.2	%		21.2	%		20.4	%		20.1	%
	Weighted-average expected life (in years)			6.3			6.5			6.8			6.7			6.1			4.2			4.1			4.2
	Weighted-average discount rate			12	%		11.2	%		9.8	%		10.2	%		12.1	%		11.4	%		10	%		10.4	%
	(a)	Value is calculated as fair value divided by the servicing portfolio.
	(b)	Represents loans sold primarily to GSEs.

Preferred_Stock

Preferred Stock	9 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
Preferred Stock	'
	Note 6		Preferred Stock
	At September 30, 2013 and December 31, 2012, the Company had authority to issue 50 million shares of preferred stock. The number of shares issued and outstanding and the carrying amount of each outstanding series of the Company’s preferred stock was as follows:
			September 30, 2013								December 31, 2012
	(Dollars in Millions)		Shares		Liquidation		Discount		Carrying		Shares		Liquidation		Discount		Carrying
			Issued and		Preference				Amount		Issued and		Preference				Amount
			Outstanding								Outstanding
	Series A			12,510	$	1,251	$	145	$	1,106		12,510	$	1,251	$	145	$	1,106
	Series B			40,000		1,000		–		1,000		40,000		1,000		–		1,000
	Series D			–		–		–		–		20,000		500		–		500
	Series F			44,000		1,100		12		1,088		44,000		1,100		12		1,088
	Series G			43,400		1,085		10		1,075		43,400		1,085		10		1,075
	Series H			20,000		500		13		487		–		–		–		–
	Total preferred stock (a)			159,910	$	4,936	$	180	$	4,756		159,910	$	4,936	$	167	$	4,769
	(a)	The par value of all shares issued and outstanding at September 30, 2013 and December 31, 2012, was $1.00 per share.
	On May 2, 2013, the Company issued depositary shares representing an ownership interest in 20,000 shares of Series H Non-Cumulative Perpetual Preferred Stock with a liquidation preference of $25,000 per share (the “Series H Preferred Stock”). The Series H Preferred Stock has no stated maturity and will not be subject to any sinking fund or other obligation of the Company. Dividends, if declared, will accrue and be payable quarterly, in arrears, at a rate per annum equal to 5.15 percent. The Series H Preferred Stock is redeemable at the Company’s option, in whole or in part, on or after July 15, 2018. The Series H Preferred stock is redeemable at the Company’s option, in whole, but not in part, prior to July 15, 2018 within 90 days following an official administrative or judicial decision, amendment to, or change in the laws or regulations that would not allow the Company to treat the full liquidation value of the Series H Preferred Stock as Tier 1 capital for purposes of the capital adequacy guidelines of the Federal Reserve. In conjunction with the issuance of the Series H Preferred Stock, the Company redeemed at par value all shares of its Series D Non-Cumulative Perpetual Preferred Stock on June 3, 2013. The Company included an $8 million loss in its computation of earnings per diluted common share for the first nine months of 2013, which represents the stock issuance costs recorded in capital surplus upon the issuance of the Series D Non-Cumulative Perpetual Preferred Stock that were reclassified to retained earnings on the redemption date.
	For further information on preferred stock, refer to Note 14 in the Company’s Annual Report on Form 10-K for the year ended December 31, 2012.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
Accumulated Other Comprehensive Income (Loss)	'
	Note 7	Accumulated Other Comprehensive Income (Loss)
	Shareholders’ equity is affected by transactions and valuations of asset and liability positions that require adjustments to accumulated other comprehensive income (loss). The reconciliation of the transactions affecting accumulated other comprehensive income (loss) included in shareholders’ equity is as follows:
	Three Months Ended September 30	Unrealized Gains			Unrealized Gains			Unrealized Gains			Unrealized Gains			Foreign			Total
	(Dollars in Millions)	(Losses) on			(Losses) on			(Losses) on			(Losses) on			Currency
		Securities			Securities			Derivative Hedges			Retirement Plans			Translation
		Available-For-Sale			Transferred From
					Available-For-
					Sale to Held-To-
					Maturity
	2013
	Balance at beginning of period	$	185		$	84		$	(313	)	$	(1,184	)	$	(60	)	$	(1,288	)
	Changes in unrealized gains and losses		(237	)		–			(17	)		38			–			(216	)
	Other-than-temporary impairment not recognized in earnings on securities available-for-sale		1			–			–			–			–			1
	Foreign currency translation adjustment		–			–			–			–			13			13
	Reclassification to earnings of realized gains and losses		3			(13	)		47			62			–			99
	Applicable income taxes		89			5			(11	)		(38	)		(5	)		40
	Balance at end of period	$	41		$	76		$	(294	)	$	(1,122	)	$	(52	)	$	(1,351	)
	2012
	Balance at beginning of period	$	504		$	134		$	(447	)	$	(977	)	$	(44	)	$	(830	)
	Changes in unrealized gains and losses		300			–			(30	)		–			–			270
	Other-than-temporary impairment not recognized in earnings on securities available-for-sale		2			–			–			–			–			2
	Foreign currency translation adjustment		–			–			–			–			26			26
	Reclassification to earnings of realized gains and losses		(1	)		(21	)		53			38			–			69
	Applicable income taxes		(115	)		8			(9	)		(14	)		(10	)		(140	)
	Balance at end of period	$	690		$	121		$	(433	)	$	(953	)	$	(28	)	$	(603	)
	Nine Months Ended September 30	Unrealized Gains			Unrealized Gains			Unrealized Gains			Unrealized Gains			Foreign			Total
	(Dollars in Millions)	(Losses) on			(Losses) on			(Losses) on			(Losses) on			Currency
		Securities			Securities			Derivative Hedges			Retirement Plans			Translation
		Available-For-Sale			Transferred From
					Available-For-
					Sale to Held-To-
					Maturity
	2013
	Balance at beginning of period	$	679		$	107		$	(404	)	$	(1,265	)	$	(40	)	$	(923	)
	Changes in unrealized gains and losses		(1,032	)		–			33			37			–			(962	)
	Other-than-temporary impairment not recognized in earnings on securities available-for-sale		8			–			–			–			–			8
	Foreign currency translation adjustment		–			–			–			–			(20	)		(20	)
	Reclassification to earnings of realized gains and losses		(8	)		(50	)		142			186			–			270
	Applicable income taxes		394			19			(65	)		(80	)		8			276
	Balance at end of period	$	41		$	76		$	(294	)	$	(1,122	)	$	(52	)	$	(1,351	)
	2012
	Balance at beginning of period	$	360		$	–		$	(489	)	$	(1,022	)	$	(49	)	$	(1,200	)
	Changes in unrealized gains and losses		738			–			(68	)		–			–			670
	Other-than-temporary impairment not recognized in earnings on securities available-for-sale		3			–			–			–			–			3
	Transfer of securities from available-for-sale to held-to-maturity		(224	)		224			–			–			–			–
	Foreign currency translation adjustment		–			–			–			–			34			34
	Reclassification to earnings of realized gains and losses		18			(28	)		158			112			–			260
	Applicable income taxes		(205	)		(75	)		(34	)		(43	)		(13	)		(370	)
	Balance at end of period	$	690		$	121		$	(433	)	$	(953	)	$	(28	)	$	(603	)
	Additional detail about the impact to net income for items reclassified out of accumulated other comprehensive income and into earnings for the periods presented, is as follows:
		Impact to Net Income
	(Dollars in Millions)	Three Months Ended			Nine Months Ended			Affected Line Item in the
		September 30, 2013			September 30, 2013			Consolidated Statement of Income
	Unrealized gains (losses) on securities available-for-sale
	Realized gains (losses) on sale of securities	$	–		$	21		Total securities gains (losses), net
	Other-than-temporary impairment recognized in earnings		(3	)		(13	)
			(3	)		8		Total before tax
			1			(3	)	Applicable income taxes
			(2	)		5		Net-of-tax
	Unrealized gains (losses) on securities transferred from available-for-sale to held-to-maturity
	Amortization of unrealized gains		13			50		Interest income
			(5	)		(19	)	Applicable income taxes
			8			31		Net-of-tax
Unrealized gains (losses) on derivative hedges
Realized gains (losses) on derivative hedges		(47	)		(142	)	Net interest income
		18			55		Applicable income taxes
		(29	)		(87	)	Net-of-tax
Unrealized gains (losses) on retirement plans
Actuarial gains (losses), prior service cost (credit) and transition obligation (asset) amortization		(62	)		(186	)	Employee benefits expense
		24			72		Applicable income taxes
		(38	)		(114	)	Net-of-tax
Total impact to net income	$	(61	)	$	(165	)

Earnings_Per_Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	Note 8		Earnings Per Share
	The components of earnings per share were:
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
	(Dollars and Shares in Millions, Except Per Share Data)		2013			2012			2013			2012
	Net income attributable to U.S. Bancorp		$	1,468		$	1,474		$	4,380		$	4,227
	Preferred dividends			(61	)		(64	)		(189	)		(174	)
	Impact of preferred stock redemption (a)			–			–			(8	)		–
	Earnings allocated to participating stock awards			(7	)		(6	)		(20	)		(19	)
	Net income applicable to U.S. Bancorp common shareholders		$	1,400		$	1,404		$	4,163		$	4,034
	Average common shares outstanding			1,832			1,886			1,844			1,892
	Net effect of the exercise and assumed purchase of stock awards			11			11			10			9
	Average diluted common shares outstanding			1,843			1,897			1,854			1,901
	Earnings per common share		$	0.76		$	0.74		$	2.26		$	2.13
	Diluted earnings per common share		$	0.76		$	0.74		$	2.25		$	2.12
	(a)	Represents stock issuance costs originally recorded in capital surplus upon the issuance of the Company’s Series D Non-Cumulative Perpetual Preferred Stock that were reclassified to retained earnings on the redemption date.
	Options outstanding at September 30, 2013, to purchase 9 million common shares for the nine months ended September 30, 2013, and outstanding at September 30, 2012, to purchase 10 million and 22 million common shares for the three months and nine months ended September 30, 2012, respectively, were not included in the computation of diluted earnings per share because they were antidilutive. Convertible senior debentures outstanding at September 30, 2012, that could potentially be converted into shares of the Company’s common stock pursuant to specified formulas, were not included in the computation of dilutive earnings per share for both the three months and nine months ended September 30, 2012, because they were antidilutive.

Employee_Benefits

Employee Benefits	9 Months Ended
	Sep. 30, 2013
Compensation And Retirement Disclosure [Abstract]	'
Employee Benefits	'
	Note 9	Employee Benefits
	The components of net periodic benefit cost for the Company’s retirement plans were:
		Three Months Ended September 30,												Nine Months Ended September 30,
		Pension Plans						Postretirement						Pension Plans						Postretirement
								Welfare Plan												Welfare Plan
	(Dollars in Millions)	2013			2012			2013			2012			2013			2012			2013			2012
	Service cost	$	42		$	33		$	1		$	2		$	126		$	97		$	3		$	4
	Interest cost		43			42			1			1			128			126			3			5
	Expected return on plan assets		(44	)		(48	)		–			(1	)		(132	)		(143	)		(1	)		(2	)
	Prior service cost (credit) and transition obligation (asset) amortization		(1	)		(2	)		–			–			(4	)		(4	)		–			–
	Actuarial loss (gain) amortization		66			41			(3	)		(1	)		198			121			(8	)		(5	)
	Net periodic benefit cost	$	106		$	66		$	(1	)	$	1		$	316		$	197		$	(3	)	$	2

Income_Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Note 10		Income Taxes
	The components of income tax expense were:
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
	(Dollars in Millions)		2013			2012			2013			2012
	Federal
	Current		$	390		$	461		$	1,506		$	1,416
	Deferred			57			50			(35	)		26
	Federal income tax			447			511			1,471			1,442
	State
	Current			84			77			161			239
	Deferred			11			5			(3	)		3
	State income tax			95			82			158			242
	Total income tax provision		$	542		$	593		$	1,629		$	1,684
	A reconciliation of expected income tax expense at the federal statutory rate of 35 percent to the Company’s applicable income tax expense follows:
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
	(Dollars in Millions)		2013			2012			2013			2012
	Tax at statutory rate		$	690		$	709		$	2,061		$	2,030
	State income tax, at statutory rates, net of federal tax benefit			62			53			102			157
	Tax effect of
	Tax credits, net of related expenses (a)			(176	)		(120	)		(394	)		(322	)
	Tax-exempt income			(52	)		(55	)		(159	)		(165	)
	Noncontrolling interests			13			15			42			39
	Other items			5			(9	)		(23	)		(55	)
	Applicable income taxes		$	542		$	593		$	1,629		$	1,684
	(a)	Excludes tax credits of $209 million for the three and nine months ended September 30, 2013 which were recognized as a reduction to the related investment asset.
	The Company’s income tax returns are subject to review and examination by federal, state, local and foreign government authorities. On an ongoing basis, numerous federal, state, local and foreign examinations are in progress and cover multiple tax years. As of September 30, 2013, the federal taxing authority has completed its examination of the Company through the fiscal year ended December 31, 2010. The years open to examination by foreign, state and local government authorities vary by jurisdiction.
	The Company’s net deferred tax liability was $1.2 billion at September 30, 2013, and $1.3 billion at December 31, 2012.

Derivative_Instruments

Derivative Instruments	9 Months Ended
	Sep. 30, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
Derivative Instruments	'
	Note 11		Derivative Instruments
	In the ordinary course of business, the Company enters into derivative transactions to manage various risks and to accommodate the business requirements of its customers. The Company recognizes all derivatives on the Consolidated Balance Sheet at fair value in other assets or in other liabilities. On the date the Company enters into a derivative contract, the derivative is designated as either a hedge of the fair value of a recognized asset or liability (“fair value hedge”); a hedge of a forecasted transaction or the variability of cash flows to be received or paid related to a recognized asset or liability (“cash flow hedge”); a hedge of the volatility of an investment in foreign operations driven by changes in foreign currency exchange rates (“net investment hedge”); or a designation is not made as it is a customer-related transaction, an economic hedge for asset/liability risk management purposes or another stand-alone derivative created through the Company’s operations (“free-standing derivative”). When a derivative is designated as a fair value, cash flow or net investment hedge, the Company performs an assessment, at inception and, at a minimum, quarterly thereafter, to determine the effectiveness of the derivative in offsetting changes in the value or cash flows of the hedged item(s).
	Fair Value Hedges These derivatives are interest rate swaps the Company uses to hedge the change in fair value related to interest rate changes of its underlying fixed-rate debt. Changes in the fair value of derivatives designated as fair value hedges, and changes in the fair value of the hedged items, are recorded in earnings. All fair value hedges were highly effective for the nine months ended September 30, 2013, and the change in fair value attributed to hedge ineffectiveness was not material.
	Cash Flow Hedges These derivatives are interest rate swaps the Company uses to hedge the forecasted cash flows from its underlying variable-rate loans and debt. Changes in the fair value of derivatives designated as cash flow hedges are recorded in other comprehensive income (loss) until the cash flows of the hedged items are realized. If a derivative designated as a cash flow hedge is terminated or ceases to be highly effective, the gain or loss in other comprehensive income (loss) is amortized to earnings over the period the forecasted hedged transactions impact earnings. If a hedged forecasted transaction is no longer probable, hedge accounting is ceased and any gain or loss included in other comprehensive income (loss) is reported in earnings immediately, unless the forecasted transaction is at least reasonably possible of occurring, whereby the amounts remain within other comprehensive income (loss). At September 30, 2013, the Company had $294 million (net-of-tax) of realized and unrealized losses on derivatives classified as cash flow hedges recorded in other comprehensive income (loss), compared with $404 million (net-of-tax) at December 31, 2012. The estimated amount to be reclassified from other comprehensive income (loss) into earnings during the remainder of 2013 and the next 12 months are losses of $30 million (net-of-tax) and $116 million (net-of-tax), respectively. This amount includes gains and losses related to hedges that were terminated early for which the forecasted transactions are still probable. All cash flow hedges were highly effective for the nine months ended September 30, 2013, and the change in fair value attributed to hedge ineffectiveness was not material.
	Net Investment Hedges The Company uses forward commitments to sell specified amounts of certain foreign currencies, and occasionally non-derivative debt instruments, to hedge the volatility of its investment in foreign operations driven by fluctuations in foreign currency exchange rates. The ineffectiveness on all net investment hedges was not material for the nine months ended September 30, 2013. There were no non-derivative debt instruments designated as net investment hedges at September 30, 2013 or December 31, 2012.
	Other Derivative Positions The Company enters into free-standing derivatives to mitigate interest rate risk and for other risk management purposes. These derivatives include forward commitments to sell to-be-announced securities (“TBAs”) and other commitments to sell residential mortgage loans, which are used to economically hedge the interest rate risk related to residential mortgage loans held for sale (“MLHFS”) and unfunded mortgage loan commitments. The Company also enters into interest rate swaps, forward commitments to buy TBAs, U.S. Treasury futures and options on U.S. Treasury futures to economically hedge the change in the fair value of the Company’s MSRs. The Company also enters into foreign currency forwards to economically hedge remeasurement gains and losses the Company recognizes on foreign currency denominated assets and liabilities. In addition, the Company acts as a seller and buyer of interest rate derivatives and foreign exchange contracts for its customers. To mitigate the market and liquidity risk associated with these customer derivatives, the Company enters into similar offsetting positions with broker-dealers. The Company also has derivative contracts that are created through its operations, including commitments to originate MLHFS and certain derivative financial guarantee contracts.
	For additional information on the Company’s purpose for entering into derivative transactions and its overall risk management strategies, refer to “Management Discussion and Analysis —Use of Derivatives to Manage Interest Rate and Other Risks” which is incorporated by reference into these Notes to Consolidated Financial Statements.
	The following table summarizes the asset and liability management derivative positions of the Company:
			Asset Derivatives									Liability Derivatives
	(Dollars in Millions)		Notional			Fair			Weighted-Average			Notional			Fair			Weighted-Average
			Value			Value			Remaining			Value			Value			Remaining
									Maturity									Maturity
									In Years									In Years
	30-Sep-13
	Fair value hedges
	Interest rate contracts
	Receive fixed/pay floating swaps		$	500		$	21			2.34		$	–		$	–			–
	Cash flow hedges
	Interest rate contracts
	Pay fixed/receive floating swaps			272			17			9.02			4,288			548			2.71
	Receive fixed/pay floating swaps			7,000			31			1.1			–			–			–
	Net investment hedges
	Foreign exchange forward contracts			–			–			–			925			11			0.05
	Other economic hedges
	Interest rate contracts
	Futures and forwards
	Buy			4,418			88			0.09			34			8			0.08
	Sell			41			2			0.2			6,203			122			0.09
	Options
	Purchased			2,325			–			0.07			–			–			–
	Written			1,800			34			0.09			9			–			0.02
	Receive fixed/pay floating swaps			3,220			83			10.23			–			–			–
	Foreign exchange forward contracts			1,980			4			0.02			2,695			6			0.02
	Equity contracts			8			–			1.72			66			–			1.89
	Credit contracts			1,177			4			4.12			2,495			11			4.91
	Total		$	22,741		$	284					$	16,715		$	706
	31-Dec-12
	Fair value hedges
	Interest rate contracts
	Receive fixed/pay floating swaps		$	500		$	30			3.09		$	–		$	–			–
	Cash flow hedges
	Interest rate contracts
	Pay fixed/receive floating swaps			32			–			9.88			4,528			718			3.79
	Receive fixed/pay floating swaps			7,000			45			1.84			–			–			–
	Net investment hedges
	Foreign exchange forward contracts			758			1			0.07			–			–			–
	Other economic hedges
	Interest rate contracts
	Futures and forwards
	Buy			11,164			138			0.07			2,921			13			0.04
	Sell			6,299			18			0.11			12,223			57			0.09
	Options
	Purchased			2,435			–			0.07			–			–			–
	Written			4,991			123			0.12			4			–			0.06
	Receive fixed/pay floating swaps			350			1			10.21			3,775			14			10.21
	Foreign exchange forward contracts			618			4			0.03			1,383			6			0.01
	Equity contracts			31			–			2.8			27			–			2.46
	Credit contracts			1,056			3			4.56			1,947			10			3.11
	Total		$	35,234		$	363					$	26,808		$	818
	The following table summarizes the customer-related derivative positions of the Company:
			Asset Derivatives									Liability Derivatives
	(Dollars in Millions)		Notional			Fair			Weighted-Average			Notional			Fair			Weighted-Average
			Value			Value			Remaining			Value			Value			Remaining
						Maturity									Maturity
						In Years									In Years
30-Sep-13
Interest rate contracts
Receive fixed/pay floating swaps		$	13,562		$	736			5.3		$	5,138		$	70			4.98
Pay fixed/receive floating swaps			4,700			76			5.15			14,089			691			5.26
Options
Purchased			3,681			28			4.46			107			1			1.12
Written			107			1			1.12			3,681			28			4.46
Foreign exchange rate contracts
Forwards, spots and swaps			10,392			411			0.71			9,688			375			0.68
Options
Purchased			367			9			0.64			–			–			–
Written			–			–			–			367			9			0.64
Total		$	32,809		$	1,261					$	33,070		$	1,174
31-Dec-12
Interest rate contracts
Receive fixed/pay floating swaps		$	16,671		$	1,085			4.78		$	1,090		$	15			9.3
Pay fixed/receive floating swaps			928			14			11.12			16,923			1,042			4.74
Options
Purchased			3,046			16			5.24			28			–			4.42
Written			286			–			0.75			2,788			16			5.68
Foreign exchange rate contracts
Forwards, spots and swaps			12,186			322			0.43			11,861			286			0.44
Options
Purchased			323			6			0.55			–			–			–
Written			–			–			–			323			6			0.55
Total		$	33,440		$	1,443					$	33,013		$	1,365
The table below shows the effective portion of the gains (losses) recognized in other comprehensive income (loss) and the gains (losses) reclassified from other comprehensive income (loss) into earnings (net-of-tax):
		Three Months Ended September 30,												Nine Months Ended September 30,
		Gains (Losses)						Gains (Losses)						Gains (Losses)						Gains (Losses)
		Recognized in						Reclassified						Recognized in						Reclassified
		Other						from Other						Other						from Other
		Comprehensive						Comprehensive						Comprehensive						Comprehensive
		Income (Loss)						Income (Loss)						Income (Loss)						Income (Loss)
								into Earnings												into Earnings
(Dollars in Millions)		2013			2012			2013			2012			2013			2012			2013			2012
Asset and Liability Management Positions
Cash flow hedges
Interest rate contracts (a)		$	(11	)	$	(19	)	$	(30	)	$	(33	)	$	22		$	(42	)	$	(88	)	$	(98	)
Net investment hedges
Foreign exchange forward contracts			(29	)		–			–			–			(23	)		(6	)		–			–
Non-derivative debt instruments			–			(11	)		–			–			–			26			–			–
Note:	Ineffectiveness on cash flow and net investment hedges was not material for the three and nine months ended September 30, 2013 and 2012.
(a)	Gains (Losses) reclassified from other comprehensive income (loss) into interest income on loans and interest expense on long-term debt.
The table below shows the gains (losses) recognized in earnings for fair value hedges, other economic hedges and the customer-related positions:
		Location of Gains (Losses)			Three Months						Nine Months
		Recognized in Earnings			Ended September 30,						Ended September 30,
(Dollars in Millions)					2013			2012			2013			2012
Asset and Liability Management Positions
Fair value hedges (a)
Interest rate contracts			Other noninterest income		$	–		$	2		$	(7	)	$	5
Foreign exchange cross-currency swaps			Other noninterest income			–			–			–			42
Other economic hedges
Interest rate contracts
Futures and forwards			Mortgage banking revenue			33			(44	)		569			67
Purchased and written options			Mortgage banking revenue			54			290			200			689
Receive fixed/pay floating swaps			Mortgage banking revenue			(5	)		48			(264	)		186
Foreign exchange forward contracts			Commercial products revenue			(16	)		(25	)		18			(62	)
Equity contracts			Compensation expense			–			1			1			2
Credit contracts			Other noninterest income/expense			2			(2	)		1			(8	)
Customer-Related Positions
Interest rate contracts
Receive fixed/pay floating swaps			Other noninterest income			13			(16	)		(288	)		(10	)
Pay fixed/receive floating swaps			Other noninterest income			(10	)		19			298			15
Foreign exchange rate contracts
Forwards, spots and swaps			Commercial products revenue			15			13			36			36
(a)	Gains (Losses) on items hedged by interest rate contracts and foreign exchange forward contracts, included in noninterest income (expense), were both zero for the three months ended September 30, 2013, and $(2) million and zero for the three months ended September 30, 2012, respectively. Gains (Losses) on items hedged by interest rate contracts and foreign exchange forward contracts, included in noninterest income (expense), were $7 million and zero for the nine months ended September 30, 2013, respectively, and $(5) million and $(44) million for the nine months ended September 30, 2012, respectively. The ineffective portion was immaterial for the three and nine months ended September 30, 2013 and 2012.
Derivatives are subject to credit risk associated with counterparties to the derivative contracts. The Company measures that credit risk using a credit valuation adjustment and includes it within the fair value of the derivative. The Company manages counterparty credit risk through diversification of its derivative positions among various counterparties, by entering into master netting arrangements and, where possible, by requiring collateral arrangements. A master netting arrangement allows two counterparties, who have multiple derivative contracts with each other, the ability to net settle amounts under all contracts, including any related collateral, through a single payment and in a single currency. Collateral arrangements require the counterparty to deliver, on a daily basis, collateral (typically cash or U.S. Treasury and agency securities) equal to the Company’s net derivative receivable. For highly-rated counterparties, the collateral arrangements may include minimum dollar thresholds, but allow for the Company to call for immediate, full collateral coverage when credit-rating thresholds are triggered by counterparties.
The Company’s collateral arrangements are predominately bilateral and, therefore, contain provisions that require collateralization of the Company’s net liability derivative positions. Required collateral coverage is based on certain net liability thresholds and contingent upon the Company’s credit rating from two of the nationally recognized statistical rating organizations. If the Company’s credit rating were to fall below credit ratings thresholds established in the collateral arrangements, the counterparties to the derivatives could request immediate full collateral coverage for derivatives in net liability positions. The aggregate fair value of all derivatives under collateral arrangements that were in a net liability position at September 30, 2013, was $1.1 billion. At September 30, 2013, the Company had $862 million of cash posted as collateral against this net liability position.

Netting_Arrangements_for_Certa

Netting Arrangements for Certain Financial Instruments	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Netting Arrangements for Certain Financial Instruments	'
	Note 12		Netting Arrangements for Certain Financial Instruments
	The majority of the Company’s derivative portfolio consists of bilateral over-the-counter trades. However, due to legislative changes effective during the first nine months of 2013, certain interest rate swaps and credit contracts need to be centrally cleared through clearinghouses. In addition, a small portion of the Company’s derivative positions are exchange-traded. These are predominately U.S. Treasury futures or options on U.S. Treasury futures. Of the Company’s $105.3 billion of total notional amount of derivative positions at September 30, 2013, $6.7 billion related to those centrally cleared through clearinghouses and $3.3 billion related to those that were exchange-traded. Irrespective of how derivatives are traded, the Company’s derivative contracts include offsetting rights (referred to as netting arrangements), and depending on expected volume, credit risk, and counterparty preference, collateral maintenance may be required. For all derivatives, fair value is determined daily and, depending on the collateral maintenance requirements, the Company and a counterparty may receive or deliver collateral, based upon the net fair value of all derivative positions between the Company and the counterparty. Collateral is typically cash, but securities may be allowed under collateral arrangements with certain counterparties. Receivables and payables related to cash collateral are included in other assets and other liabilities on the Consolidated Balance Sheet, along with the related derivative asset and liability fair values. Any securities pledged to counterparties as collateral remain on the Consolidated Balance Sheet. Securities received from counterparties as collateral are not recognized on the Consolidated Balance Sheet, unless the counterparty defaults. Securities used as collateral can be sold, re-pledged or otherwise used by the party in possession. No restrictions exist on the use of cash collateral by either party. Refer to Note 11 for further discussion of the Company’s derivatives, including collateral arrangements.
	As part of the Company’s treasury and broker-dealer operations, the Company executes transactions that are treated as securities sold under agreements to repurchase or securities purchased under agreements to resell, both of which are accounted for as collateralized financings. Securities sold under agreements to repurchase include repurchase agreements and securities loaned transactions. Securities purchased under agreements to resell include reverse repurchase agreements and securities borrowed transactions. For securities sold under agreements to repurchase, the Company records a liability for the cash received, which is included in short-term borrowings on the Consolidated Balance Sheet. For securities purchased under agreements to resell, the Company records a receivable for the cash paid, which is included in other assets on the Consolidated Balance Sheet.
	Securities transferred to counterparties under repurchase agreements and securities loaned transactions continue to be recognized on the Consolidated Balance Sheet, are measured at fair value, and are included in investment securities or other assets. Securities received from counterparties under reverse repurchase agreements and securities borrowed transactions are not recognized on the Consolidated Balance Sheet unless the counterparty defaults. Under all transactions, the fair values of the securities are determined daily, and additional cash is obtained or refunded to counterparties where appropriate. The securities transferred under repurchase and reverse repurchase transactions typically are U.S. Treasury securities or agency mortgage-backed securities. The securities loaned or borrowed are typically high-grade corporate bonds traded by the Company’s broker-dealer. The securities transferred can be sold, repledged or otherwise used by the party in possession. No restrictions exist on the use of cash collateral by either party.
	The Company executes its derivative, repurchase/reverse repurchase and securities loaned/borrowed transactions under the respective industry standard agreements. These agreements include master netting arrangements that allow for multiple contracts executed with the same counterparty to be viewed as a single arrangement. This allows for net settlement of a single amount on a daily basis. In the event of default, the master netting arrangement provides for close-out netting, which allows all positions with the defaulting counterparty to be terminated and net settled with a single payment amount.
	The Company has elected to offset the assets and liabilities under netting arrangements for the balance sheet presentation of the majority of its derivative counterparties, excluding centrally cleared derivative contracts due to current uncertainty about the legal enforceability of netting arrangements with the clearinghouses. The netting occurs at the counterparty level, and includes all assets and liabilities related to the derivative contracts, including those associated with cash collateral received or pledged. The Company has not elected to offset the assets and liabilities under netting arrangements for the balance sheet presentation of repurchase/reverse repurchase and securities loaned/borrowed transactions.
	The following tables provide information on the Company’s netting adjustments, and items not offset on the Consolidated Balance Sheet but available for offset in the event of default:
			Gross		Gross Amounts			Net Amounts		Gross Amounts Not Offset on						Net
			Recognized		Offset on the			Presented on the		the Consolidated Balance Sheet						Amount
			Assets		Consolidated			Consolidated
	(Dollars in Millions)				Balance Sheet (a)			Balance Sheet		Financial			Collateral
										Instruments (b)			Received (c)
	30-Sep-13
	Derivative assets (d)		$	1,362	$	(572	)	$	790	$	(32	)	$	–		$	758
	Reverse repurchase agreements			150		–			150		(35	)		(115	)		–
	Securities borrowed			527		–			527		(1	)		(510	)		16
	Total		$	2,039	$	(572	)	$	1,467	$	(68	)	$	(625	)	$	774
	31-Dec-12
	Derivative assets (d)		$	1,546	$	(418	)	$	1,128	$	(148	)	$	–		$	980
	Reverse repurchase agreements			363		–			363		(44	)		(319	)		–
	Securities borrowed			368		–			368		–			(356	)		12
	Total		$	2,277	$	(418	)	$	1,859	$	(192	)	$	(675	)	$	992
	(a)	Includes $75 million and $79 million of cash collateral related payables that were netted against derivative assets at September 30, 2013 and December 31, 2012, respectively.
	(b)	For derivative assets this includes any derivative liability fair values that could be offset in the event of counterparty default; for reverse repurchase agreements this includes any repurchase agreement payables that could be offset in the event of counterparty default; for securities borrowed this includes any securities loaned payables that could be offset in the event of counterparty default.
	(c)	Includes the fair value of securities received by the Company from the counterparty. These securities are not included on the Consolidated Balance Sheet unless the counterparty defaults.
	(d)	Excludes $183 million and $260 million of derivative assets centrally cleared or otherwise not subject to netting arrangements at September 30, 2013 and December 31, 2012, respectively.
			Gross		Gross Amounts			Net Amounts		Gross Amounts Not Offset on						Net
			Recognized		Offset on the			Presented on the		the Consolidated Balance Sheet						Amount
			Liabilities		Consolidated			Consolidated
	(Dollars in Millions)				Balance Sheet (a)			Balance Sheet		Financial			Collateral
										Instruments (b)			Pledged (c)
	30-Sep-13
	Derivative liabilities (d)		$	1,825	$	(1,358	)	$	467	$	(32	)	$	–		$	435
	Repurchase agreements			1,940		–			1,940		(35	)		(1,905	)		–
	Securities loaned			134		–			134		(1	)		(132	)		1
	Total		$	3,899	$	(1,358	)	$	2,541	$	(68	)	$	(2,037	)	$	436
	31-Dec-12
	Derivative liabilities (d)		$	2,178	$	(1,549	)	$	629	$	(148	)	$	–		$	481
	Repurchase agreements			3,389		–			3,389		(44	)		(3,345	)		–
	Securities loaned			–		–			–		–			–			–
	Total		$	5,567	$	(1,549	)	$	4,018	$	(192	)	$	(3,345	)	$	481
	(a)	Includes $862 million and $1.2 billion of cash collateral related receivables that were netted against derivative liabilities at September 30, 2013 and December 31, 2012, respectively.
	(b)	For derivative liabilities this includes any derivative asset fair values that could be offset in the event of counterparty default; for repurchase agreements this includes any reverse repurchase agreement receivables that could be offset in the event of counterparty default; for securities loaned this includes any securities borrowed receivables that could be offset in the event of counterparty default.
	(c)	Includes the fair value of securities pledged by the Company to the counterparty. These securities are included on the Consolidated Balance Sheet unless the Company defaults.
	(d)	Excludes $55 million and $5 million of derivative liabilities centrally cleared or otherwise not subject to netting arrangements at September 30, 2013 and December 31, 2012, respectively.

Fair_Values_of_Assets_and_Liab

Fair Values of Assets and Liabilities	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Fair Values of Assets and Liabilities	'
	Note 13		Fair Values of Assets and Liabilities
	The Company uses fair value measurements for the initial recording of certain assets and liabilities, periodic remeasurement of certain assets and liabilities, and disclosures. Derivatives, trading and available-for-sale investment securities, certain MLHFS and MSRs are recorded at fair value on a recurring basis. Additionally, from time to time, the Company may be required to record at fair value other assets on a nonrecurring basis, such as loans held for sale, loans held for investment and certain other assets. These nonrecurring fair value adjustments typically involve application of lower-of-cost-or-fair value accounting or impairment write-downs of individual assets.
	Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. A fair value measurement reflects all of the assumptions that market participants would use in pricing the asset or liability, including assumptions about the risk inherent in a particular valuation technique, the effect of a restriction on the sale or use of an asset, and the risk of nonperformance.
	The Company groups its assets and liabilities measured at fair value into a three-level hierarchy for valuation techniques used to measure financial assets and financial liabilities at fair value. This hierarchy is based on whether the valuation inputs are observable or unobservable. These levels are:
		•		Level 1 – Quoted prices in active markets for identical assets or liabilities. Level 1 includes U.S. Treasury and exchange-traded instruments.
		•		Level 2 – Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 2 includes debt securities that are traded less frequently than exchange-traded instruments and which are typically valued using third party pricing services; derivative contracts and other assets and liabilities, including securities, whose value is determined using a pricing model with inputs that are observable in the market or can be derived principally from or corroborated by observable market data; and MLHFS whose values are determined using quoted prices for similar assets or pricing models with inputs that are observable in the market or can be corroborated by observable market data.
		•		Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose values are determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation. This category includes MSRs, certain debt securities and certain derivative contracts.
	When the Company changes its valuation inputs for measuring financial assets and financial liabilities at fair value, either due to changes in current market conditions or other factors, it may need to transfer those assets or liabilities to another level in the hierarchy based on the new inputs used. The Company recognizes these transfers at the end of the reporting period that the transfers occur. During the nine months ended September 30, 2013 and 2012, there were no transfers of financial assets or financial liabilities between the hierarchy levels.
	The Company has processes and controls in place to increase the reliability of estimates it makes in determining fair value measurements. Items quoted on an exchange are verified to the quoted price. Items provided by a third party pricing service are subject to price verification procedures as discussed in more detail in the specific valuation discussions provided in the section that follows. For fair value measurements modeled internally, the Company’s valuation models are subject to the Company’s Model Risk Governance Policy and Program, as maintained by the Company’s credit administration department. The purpose of model validation is to assess the accuracy of the models’ input, processing, and reporting components. All models are required to be independently reviewed and approved prior to being placed in use, and are subject to formal change control procedures. Under the Company’s Model Risk Governance Policy, models are required to be reviewed at least annually to ensure they are operating as intended. Inputs into the models are market observable inputs whenever available. When market observable inputs are not available, the inputs are developed based upon analysis of historical experience and evaluation of other relevant market data. Significant unobservable model inputs are subject to review by senior management in corporate functions, who are independent from the modeling. Significant unobservable model inputs are also compared to actual results, typically on a quarterly basis. Significant Level 3 fair value measurements are also subject to corporate-level review and are benchmarked to market transactions or other market data, when available. Additional discussion of processes and controls are provided in the valuation methodologies section that follows.
	The following section describes the valuation methodologies used by the Company to measure financial assets and liabilities at fair value and for estimating fair value for financial instruments not recorded at fair value as required under disclosure guidance related to the fair value of financial instruments. In addition, the following section includes an indication of the level of the fair value hierarchy in which the assets or liabilities are classified. Where appropriate, the description includes information about the valuation models and key inputs to those models. During the nine months ended September 30, 2013 and 2012, there were no significant changes to the valuation techniques used by the Company to measure fair value.
	Cash and Due From Banks The carrying value of cash and due from banks approximate fair value and are classified within Level 1. Fair value is provided for disclosure purposes only.
	Federal Funds Sold and Securities Purchased Under Resale Agreements The carrying value of federal funds sold and securities purchased under resale agreements approximate fair value because of the relatively short time between the origination of the instrument and its expected realization and are classified within Level 2. Fair value is provided for disclosure purposes only.
	Investment Securities When quoted market prices for identical securities are available in an active market, these prices are used to determine fair value and these securities are classified within Level 1 of the fair value hierarchy. Level 1 investment securities are predominantly U.S. Treasury securities.
	For other securities, quoted market prices may not be readily available for the specific securities. When possible, the Company determines fair value based on market observable information, including quoted market prices for similar securities, inactive transaction prices, and broker quotes. These securities are classified within Level 2 of the fair value hierarchy. Level 2 valuations are generally provided by a third party pricing service. The Company reviews the valuation methodologies utilized by the pricing service and, on a quarterly basis, reviews the security level prices provided by the pricing service against management’s expectation of fair value, based on changes in various benchmarks and market knowledge from recent trading activity. Additionally, each quarter, the Company validates the fair value provided by the pricing services by comparing them to recent observable market trades (where available), broker provided quotes, or other independent secondary pricing sources. Prices obtained from the pricing service are adjusted if they are found to be inconsistent with observable market data. Level 2 investment securities are predominantly agency mortgage-backed securities, certain other asset-backed securities, municipal securities, corporate debt securities, agency debt securities and perpetual preferred securities.
	The fair value of securities for which there are no market trades, or where trading is inactive as compared to normal market activity, are classified within Level 3 of the fair value hierarchy. The Company determines the fair value of these securities using a discounted cash flow methodology and incorporating observable market information, where available. These valuations are modeled by a unit within the Company’s treasury department. The valuations use assumptions regarding housing prices, interest rates and borrower performance. Inputs are refined and updated at least quarterly to reflect market developments and actual performance. The primary valuation drivers of these securities are the prepayment rates, default rates and default severities associated with the underlying collateral, as well as the discount rate used to calculate the present value of the projected cash flows. Level 3 fair values, including the assumptions used, are subject to review by senior management in corporate functions, who are independent from the modeling. The fair value measurements are also compared to fair values provided by third party pricing services, where available. Securities classified within Level 3 include non-agency mortgage-backed securities, non-agency commercial mortgage-backed securities, certain asset-backed securities, certain collateralized debt obligations and collateralized loan obligations and certain corporate debt securities.
	Mortgage Loans Held For Sale MLHFS measured at fair value, for which an active secondary market and readily available market prices exist, are initially valued at the transaction price and are subsequently valued by comparison to instruments with similar collateral and risk profiles. MLHFS are classified within Level 2. Included in mortgage banking revenue was a $5 million net loss and a $241 million net gain for the three months ended September 30, 2013 and 2012, respectively, and a $326 million net loss and a $501 million net gain for the nine months ended September 30, 2013 and 2012, respectively, from the changes to fair value of these MLHFS under fair value option accounting guidance. Changes in fair value due to instrument specific credit risk were immaterial. Interest income for MLHFS is measured based on contractual interest rates and reported as interest income on the Consolidated Statement of Income. Electing to measure MLHFS at fair value reduces certain timing differences and better matches changes in fair value of these assets with changes in the value of the derivative instruments used to economically hedge them without the burden of complying with the requirements for hedge accounting.
	Loans The loan portfolio includes adjustable and fixed-rate loans, the fair value of which was estimated using discounted cash flow analyses and other valuation techniques. The expected cash flows of loans considered historical prepayment experiences and estimated credit losses and were discounted using current rates offered to borrowers of similar credit characteristics. Generally, loan fair values reflect Level 3 information. Fair value is provided for disclosure purposes only, with the exception of impaired collateral-based loans that are measured at fair value on a non-recurring basis utilizing the underlying collateral fair value.
	Mortgage Servicing Rights MSRs are valued using a discounted cash flow methodology. Accordingly, MSRs are classified within Level 3. The Company determines fair value by estimating the present value of the asset’s future cash flows using prepayment rates, discount rates, and other assumptions. The MSR valuations, as well as the assumptions used, are developed by the mortgage banking division and are subject to review by senior management in corporate functions, who are independent from the modeling. The MSR valuations and assumptions are validated through comparison to trade information, publicly available data and industry surveys when available, and are also compared to independent third party valuations each quarter. Risks inherent in MSR valuation include higher than expected prepayment rates and/or delayed receipt of cash flows. There is minimal observable market activity for MSRs on comparable portfolios, and, therefore the determination of fair value requires significant management judgment. Refer to Note 5 for further information on MSR valuation assumptions.
	Derivatives The majority of derivatives held by the Company are executed over-the-counter and are valued using standard cash flow, Black-Derman-Toy and Monte Carlo valuation techniques. The models incorporate inputs, depending on the type of derivative, including interest rate curves, foreign exchange rates and volatility. In addition, all derivative values incorporate an assessment of the risk of counterparty nonperformance, measured based on the Company’s evaluation of credit risk as well as external assessments of credit risk, where available. The Company monitors and manages its nonperformance risk by considering its ability to net derivative positions under master netting arrangements, as well as collateral received or provided under collateral arrangements. Accordingly, the Company has elected to measure the fair value of derivatives, at a counterparty level, on a net basis. The majority of the derivatives are classified within Level 2 of the fair value hierarchy, as the significant inputs to the models, including nonperformance risk, are observable. However, certain derivative transactions are with counterparties where risk of nonperformance cannot be observed in the market, and therefore the credit valuation adjustments result in these derivatives being classified within Level 3 of the fair value hierarchy. The credit valuation adjustments for nonperformance risk are determined by the Company’s treasury department using credit assumptions provided by credit administration. The credit assumptions are compared to actual results quarterly and are recalibrated as appropriate.
	The Company also has commitments to purchase and originate mortgage loans that meet the accounting requirements of a derivative. These mortgage loan commitments are valued by pricing models that include market observable and unobservable inputs, which result in the commitments being classified within Level 3 of the fair value hierarchy. The unobservable inputs include assumptions about the percentage of commitments that actually become a closed loan and the MSR value that is inherent in the underlying loan value, both of which are developed by the Company’s mortgage banking division. The closed loan percentages for the mortgage loan commitments are monitored on an on-going basis, as these percentages are also used for the Company’s economic hedging activities. The inherent MSR value for the commitments are generated by the same models used for the Company’s MSRs and thus are subject to the same processes and controls as described for the MSRs above.
	Other Financial Instruments Other financial instruments include cost method equity investments and community development and tax-advantaged related assets and liabilities. The majority of the Company’s cost method equity investments are in Federal Home Loan Bank and Federal Reserve Bank stock, whose carrying amounts approximate their fair value and are classified within Level 2. Investments in private equity and other limited partnership funds are estimated using fund provided net asset values. These equity investments are classified within Level 3. Fair value is provided for disclosure purposes only.
	Community development and tax-advantaged investments generate a return primarily through the realization of federal and state income tax credits, with a duration typically equal to the period that the tax credits are realized. Asset balances primarily represent the assets of the underlying community development and tax-advantaged entities the Company consolidated per applicable authoritative accounting guidance. Liabilities of the underlying consolidated entities were included in long-term debt. The carrying value of the asset balances are a reasonable estimate of fair value and are classified within Level 3. Refer to Note 4 for further information on community development and tax-advantaged related assets and liabilities. Fair value is provided for disclosure purposes only.
	Deposit Liabilities The fair value of demand deposits, savings accounts and certain money market deposits is equal to the amount payable on demand. The fair value of fixed-rate certificates of deposit was estimated by discounting the contractual cash flow using current market rates. Deposit liabilities are classified within Level 2. Fair value is provided for disclosure purposes only.
	Short-term Borrowings Federal funds purchased, securities sold under agreements to repurchase, commercial paper and other short-term funds borrowed have floating rates or short-term maturities. The fair value of short-term borrowings was determined by discounting contractual cash flows using current market rates. Short-term borrowings are classified within Level 2. Included in short-term borrowings is the Company’s obligation on securities sold short, which is required to be accounted for at fair value per applicable accounting guidance. Fair value for other short-term borrowings is provided for disclosure purposes only.
	Long-term Debt The fair value for most long-term debt was determined by discounting contractual cash flows using current market rates. Junior subordinated debt instruments were valued using market quotes. Long-term debt is classified within Level 2. Fair value is provided for disclosure purposes only.
	Loan Commitments, Letters of Credit and Guarantees The fair value of commitments, letters of credit and guarantees represents the estimated costs to terminate or otherwise settle the obligations with a third party. Other loan commitments, letters of credit and guarantees are not actively traded, and the Company estimates their fair value based on the related amount of unamortized deferred commitment fees adjusted for the probable losses for these arrangements. These arrangements are classified within Level 3. Fair value is provided for disclosure purposes only.
	Significant Unobservable Inputs of Level 3 Assets and Liabilities
	The following section provides information on the significant inputs used by the Company to determine the fair value measurements of Level 3 assets and liabilities recorded at fair value on the Consolidated Balance Sheet. In addition, the following section includes a discussion of the sensitivity of the fair value measurements to changes in the significant inputs and a description of any interrelationships between these inputs for Level 3 assets and liabilities recorded at fair value on a recurring basis. The discussion below excludes nonrecurring fair value measurements of collateral value used for impairment measures for loans and other real estate owned. These valuations utilize third party appraisal or broker price opinions, and are classified as Level 3 due to the significant judgment involved.
	Available-For-Sale Investment Securities The significant unobservable inputs used in the fair value measurement of the Company’s modeled Level 3 available-for-sale investment securities are prepayment rates, probability of default and loss severities associated with the underlying collateral, as well as the discount margin used to calculate the present value of the projected cash flows. Increases in prepayment rates for Level 3 securities will typically result in higher fair values, as increased prepayment rates accelerate the receipt of expected cash flows and reduce exposure to credit losses. Increases in the probability of default and loss severities will result in lower fair values, as these increases reduce expected cash flows. Discount margin is the Company’s estimate of the current market spread above the respective benchmark rate. Higher discount margin will result in lower fair values, as it reduces the present value of the expected cash flows.
	Prepayment rates generally move in the opposite direction of market interest rates. In the current environment, an increase in the probability of default will generally be accompanied with an increase in loss severity, as both are impacted by underlying collateral values. Discount margins are influenced by market expectations about the security’s collateral performance, and therefore may directionally move with probability and severity of default; however, discount margins are also impacted by broader market forces, such as competing investment yields, sector liquidity, economic news, and other macroeconomic factors.
	The following table shows the significant valuation assumption ranges for Level 3 available-for-sale investment securities at September 30, 2013:
			Minimum			Maximum			Average
	Residential Prime Non-Agency Mortgage-Backed Securities (a)
	Estimated lifetime prepayment rates			6	%		20	%		13	%
	Lifetime probability of default rates			–			7			4
	Lifetime loss severity rates			25			65			43
	Discount margin			2			6			4
	Residential Non-Prime Non-Agency Mortgage-Backed Securities (b)
	Estimated lifetime prepayment rates			2	%		10	%		6	%
	Lifetime probability of default rates			4			11			7
	Lifetime loss severity rates			15			70			54
	Discount margin			1			6			3
	Other Asset-Backed Securities
	Estimated lifetime prepayment rates			6	%		6	%		6	%
	Lifetime probability of default rates			4			4			4
	Lifetime loss severity rates			40			40			40
	Discount margin			8			8			8
	(a)	Prime securities are those designated as such by the issuer at origination. When an issuer designation is unavailable, the Company determines at acquisition date the categorization based on asset pool characteristics (such as weighted-average credit score, loan-to-value, loan type, prevalence of low documentation loans) and deal performance (such as pool delinquencies and security market spreads).
	(b)	Includes all securities not meeting the conditions to be designated as prime.
	Mortgage Servicing Rights The significant unobservable inputs used in the fair value measurement of the Company’s MSRs are expected prepayments and the discount rate used to calculate the present value of the projected cash flows. Significant increases in either of these inputs in isolation would result in a significantly lower fair value measurement. Significant decreases in either of these inputs in isolation would result in a significantly higher fair value measurement. There is no direct interrelationship between prepayments and discount rate. Prepayment rates generally move in the opposite direction of market interest rates. Discount rates are generally impacted by changes in market return requirements.
	The following table shows the significant valuation assumption ranges for MSRs at September 30, 2013:
			Minimum			Maximum			Average
	Expected prepayment			10	%		22	%		12	%
	Discount rate			10			13			10
	Derivatives The Company has two distinct Level 3 derivative portfolios: (i) the Company’s commitments to sell, purchase and originate mortgage loans that meet the requirements of a derivative, and (ii) the Company’s asset/liability and customer-related derivatives that are Level 3 due to unobservable inputs related to measurement of risk of nonperformance by the counterparty.
	The significant unobservable inputs used in the fair value measurement of the Company’s derivative commitments to sell, purchase and originate mortgage loans are the percentage of commitments that actually become a closed loan and the MSR value that is inherent in the underlying loan value. A significant increase in the rate of loans that close would result in a larger derivative asset or liability. A significant increase in the inherent MSR value would result in an increase in the derivative asset or a reduction in the derivative liability. Expected loan close rates and the inherent MSR values are directly impacted by changes in market rates and will generally move in the same direction as interest rates.
	The following table shows the significant valuation assumption ranges for the Company’s derivative commitments to sell, purchase and originate mortgage loans at September 30, 2013:
			Minimum			Maximum			Average
	Expected loan close rate			32	%		100	%		76	%
	Inherent MSR value (basis points per loan)			46			219			108
	The significant unobservable input used in the fair value measurement of certain of the Company’s asset/liability and customer-related derivatives is the credit valuation adjustment related to the risk of counterparty nonperformance. A significant increase in the credit valuation adjustment would result in a lower fair value measurement. A significant decrease in the credit valuation adjustment would result in a higher fair value measurement. The credit valuation adjustment is impacted by changes in the Company’s assessment of the counterparty’s credit position. At September 30, 2013, the minimum, maximum and average credit valuation adjustment as a percentage of the derivative contract fair value prior to adjustment was 0 percent, 95 percent and 6 percent, respectively.
	The following table summarizes the balances of assets and liabilities measured at fair value on a recurring basis:
	(Dollars in Millions)		Level 1			Level 2			Level 3			Netting			Total
30-Sep-13
Available-for-sale securities
U.S. Treasury and agencies		$	463		$	1,058		$	–		$	–		$	1,521
Mortgage-backed securities
Residential
Agency			–			29,220			–			–			29,220
Non-agency
Prime (a)			–			–			500			–			500
Non-prime (b)			–			–			303			–			303
Commercial
Agency			–			169			–			–			169
Asset-backed securities
Collateralized debt obligations/Collateralized loan obligations			–			25			–			–			25
Other			–			570			40			–			610
Obligations of state and political subdivisions			–			5,820			–			–			5,820
Obligations of foreign governments			–			6			–			–			6
Corporate debt securities			–			633			9			–			642
Perpetual preferred securities			–			209			–			–			209
Other investments			265			17			–			–			282
Total available-for-sale			728			37,727			852			–			39,307
Mortgage loans held for sale			–			3,844			–			–			3,844
Mortgage servicing rights			–			–			2,577			–			2,577
Derivative assets			–			875			670			(572	)		973
Other assets			85			922			–			–			1,007
Total		$	813		$	43,368		$	4,099		$	(572	)	$	47,708
Derivative liabilities		$	–		$	1,827		$	53		$	(1,358	)	$	522
Short-term borrowings (c)			231			533			–			–			764
Total		$	231		$	2,360		$	53		$	(1,358	)	$	1,286
31-Dec-12
Available-for-sale securities
U.S. Treasury and agencies		$	491		$	735		$	–		$	–		$	1,226
Mortgage-backed securities
Residential
Agency			–			29,495			–			–			29,495
Non-agency
Prime (a)			–			–			624			–			624
Non-prime (b)			–			–			355			–			355
Commercial
Agency			–			193			–			–			193
Asset-backed securities
Collateralized debt obligations/Collateralized loan obligations			–			42			–			–			42
Other			–			577			15			–			592
Obligations of state and political subdivisions			–			6,455			–			–			6,455
Obligations of foreign governments			–			6			–			–			6
Corporate debt securities			–			722			9			–			731
Perpetual preferred securities			–			218			–			–			218
Other investments			187			15			–			–			202
Total available-for-sale			678			38,458			1,003			–			40,139
Mortgage loans held for sale			–			7,957			–			–			7,957
Mortgage servicing rights			–			–			1,700			–			1,700
Derivative assets			–			572			1,234			(418	)		1,388
Other assets			94			386			–			–			480
Total		$	772		$	47,373		$	3,937		$	(418	)	$	51,664
Derivative liabilities		$	–		$	2,128		$	55		$	(1,549	)	$	634
Short-term borrowings (c)			50			351			–			–			401
Total		$	50		$	2,479		$	55		$	(1,549	)	$	1,035
(a)	Prime securities are those designated as such by the issuer at origination. When an issuer designation is unavailable, the Company determines at acquisition date the categorization based on asset pool characteristics (such as weighted-average credit score, loan-to-value, loan type, prevalence of low documentation loans) and deal performance (such as pool delinquencies and security market spreads).
(b)	Includes all securities not meeting the conditions to be designated as prime.
(c)	Represents the Company’s obligation on securities sold short required to be accounted for at fair value per applicable accounting guidance.
The following table presents the changes in fair value for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three months ended September 30:
(Dollars in Millions)		Beginning			Net Gains			Net Gains			Purchases			Sales			Principal			Issuances			Settlements			End		Net Change in
		of Period			(Losses)			(Losses)									Payments									of		Unrealized Gains
		Balance			Included in			Included in																		Period		(Losses) Relating
					Net Income			Other																		Balance		to Assets
								Comprehensive																				Still Held at
								Income (Loss)																				End of Period
2013
Available-for-sale securities
Mortgage-backed securities
Residential non-agency
Prime (a)		$	547		$	(2	)	$	(4	)	$	–		$	–		$	(41	)	$	–		$	–		$	500	$	(4	)
Non-prime (b)			319			(3	)		(4	)		–			–			(9	)		–			–			303		(4	)
Asset-backed securities
Other			40			1			(2	)		3			–			(2	)		–			–			40		(2	)
Corporate debt securities			9			–			–			–			–			–			–			–			9		–
Total available-for-sale			915			(4	)(c)		(10	)(f)		3			–			(52	)		–			–			852		(10	)
Mortgage servicing rights			2,377			11	(d)		–			2			–			–			187	(g)		–			2,577		11	(d)
Net derivative assets and liabilities			423			182	(e)		–			–			(2	)		–			–			14			617		62	(h)
2012
Available-for-sale securities
Mortgage-backed securities
Residential non-agency
Prime (a)		$	713		$	(4	)	$	23		$	–		$	(61	)	$	(40	)	$	–		$	–		$	631	$	26
Non-prime (b)			796			(8	)		132			–			(562	)		(18	)		–			–			340		23
Commercial non-agency			37			–			2			–			(39	)		–			–			–			–		–
Asset-backed securities
Collateralized debt obligations/Collateralized loan obligations			102			2			(7	)		–			(96	)		(1	)		–			–			–		–
Other			112			1			(4	)		3			(93	)		(3	)		–			–			16		2
Corporate debt securities			9			–			–			–			–			–			–			–			9		–
Total available-for-sale			1,769			(9	)(i)		146	(f)		3			(851	)		(62	)		–			–			996		51
Mortgage servicing rights			1,594			(275	)(d)		–			10			–			–			224	(g)		–			1,553		(275	)(d)
Net derivative assets and liabilities			1,360			843	(j)		–			1			(1	)		–			–			(713	)		1,490		(557	)(k)
(a)	Prime securities are those designated as such by the issuer at origination. When an issuer designation is unavailable, the Company determines at acquisition date the categorization based on asset pool characteristics (such as weighted-average credit score, loan-to-value, loan type, prevalence of low documentation loans) and deal performance (such as pool delinquencies and security market spreads).
(b)	Includes all securities not meeting the conditions to be designated as prime.
(c)	Approximately $(3) million included in securities gains (losses) and $(1) million included in interest income.
(d)	Included in mortgage banking revenue.
(e)	Approximately $89 million included in other noninterest income and $93 million included in mortgage banking revenue.
(f)	Included in changes in unrealized gains and losses on securities available-for-sale.
(g)	Represents MSRs capitalized during the period.
(h)	Approximately $(28) million included in other noninterest income and $90 million included in mortgage banking revenue.
(i)	Approximately $(15) million included in securities gains (losses) and $6 million included in interest income.
(j)	Approximately $124 million included in other noninterest income and $719 million included in mortgage banking revenue.
(k)	Approximately $7 million included in other noninterest income and $(564) million included in mortgage banking revenue.
The following table presents the changes in fair value for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the nine months ended September 30:
(Dollars in Millions)		Beginning			Net Gains			Net Gains			Purchases			Sales			Principal			Issuances			Settlements			End		Net Change in
		of Period			(Losses)			(Losses)									Payments									of		Unrealized Gains
		Balance			Included in			Included in																		Period		(Losses) Relating
					Net Income			Other																		Balance		to Assets
								Comprehensive																				Still Held at
								Income (Loss)																				End of Period
2013
Available-for-sale securities
Mortgage-backed securities
Residential non-agency
Prime (a)		$	624		$	(6	)	$	4		$	–		$	–		$	(122	)	$	–		$	–		$	500	$	4
Non-prime (b)			355			(11	)		13			–			(20	)		(34	)		–			–			303		14
Asset-backed securities
Other			15			2			(1	)		28			–			(4	)		–			–			40		(1	)
Corporate debt securities			9			–			–			–			–			–			–			–			9		–
Total available-for-sale			1,003			(15	)(c)		16	(f)		28			(20	)		(160	)		–			–			852		17
Mortgage servicing rights			1,700			196	(d)		–			7			–			–			674	(g)		–			2,577		196	(d)
Net derivative assets and liabilities			1,179			(34	)(e)		–			1			(4	)		–			–			(525	)		617		(565	)(h)
2012
Available-for-sale securities
Mortgage-backed securities
Residential non-agency
Prime (a)		$	803		$	(5	)	$	60		$	–		$	(109	)	$	(118	)	$	–		$	–		$	631	$	58
Non-prime (b)			802			(18	)		197			–			(562	)		(79	)		–			–			340		52
Commercial non-agency			42			1			–			–			(39	)		(4	)		–			–			–		–
Asset-backed securities
Collateralized debt obligations/Collateralized loan obligations			120			12			(8	)		–			(103	)		(21	)		–			–			–		–
Other			117			7			–			3			(93	)		(18	)		–			–			16		2
Corporate debt securities			9			–			–			–			–			–			–			–			9		–
Total available-for-sale			1,893			(3	)(i)		249	(f)		3			(906	)		(240	)		–			–			996		112
Mortgage servicing rights			1,519			(705	)(d)		–			39			–			–			700	(g)		–			1,553		(705	)(d)
Net derivative assets and liabilities			1,228			2,050	(j)		–			1			(3	)		–			–			(1,786	)		1,490		(1,407	)(k)
(a)	Prime securities are those designated as such by the issuer at origination. When an issuer designation is unavailable, the Company determines at acquisition date the categorization based on asset pool characteristics (such as weighted-average credit score, loan-to-value, loan type, prevalence of low documentation loans) and deal performance (such as pool delinquencies and security market spreads).
(b)	Includes all securities not meeting the conditions to be designated as prime.
(c)	Approximately $(13) million included in securities gains (losses) and $(2) million included in interest income.
(d)	Included in mortgage banking revenue.
(e)	Approximately $(122) million included in other noninterest income and $88 million included in mortgage banking revenue.
(f)	Included in changes in unrealized gains and losses on securities available-for-sale.
(g)	Represents MSRs capitalized during the period.
(h)	Approximately $(301)million included in other noninterest income and $(264) million included in mortgage banking revenue.
(i)	Approximately $(37) million included in securities gains (losses) and $34 million included in interest income.
(j)	Approximately $344 million included in other noninterest income and $1.7 billion included in mortgage banking revenue.
(k)	Approximately $6 million included in other noninterest income and $1.4 billion included in mortgage banking revenue.
The Company is also required periodically to measure certain other financial assets at fair value on a nonrecurring basis. These measurements of fair value usually result from the application of lower-of-cost-or-fair value accounting or write-downs of individual assets.
The following table summarizes the balances of assets measured at fair value on a nonrecurring basis:
		30-Sep-13												31-Dec-12
(Dollars in Millions)		Level 1			Level 2			Level 3			Total			Level 1			Level 2			Level 3			Total
Loans (a)		$	–		$	–		$	94		$	94		$	–		$	–		$	140		$	140
Other assets (b)			–			–			144			144			–			–			194			194
(a)	Represents the carrying value of loans for which adjustments were based on the fair value of the collateral, excluding loans fully charged-off.
(b)	Primarily represents the fair value of foreclosed properties that were measured at fair value based on an appraisal or broker price opinion of the collateral subsequent to their initial acquisition.
The following table summarizes losses recognized related to nonrecurring fair value measurements of individual assets or portfolios:
		Three Months						Nine Months
		Ended September 30,						Ended September 30,
(Dollars in Millions)		2013			2012			2013			2012
Loans (a)		$	22		$	12		$	55		$	51
Other assets (b)			14			42			73			129
(a)	Represents write-downs of loans which were based on the fair value of the collateral, excluding loans fully charged-off.
(b)	Primarily represents related losses of foreclosed properties that were measured at fair value subsequent to their initial acquisition.
Fair Value Option
The following table summarizes the differences between the aggregate fair value carrying amount of MLHFS for which the fair value option has been elected and the aggregate unpaid principal amount that the Company is contractually obligated to receive at maturity:
		30-Sep-13									31-Dec-12
(Dollars in Millions)		Fair Value			Aggregate			Carrying			Fair Value			Aggregate			Carrying
		Carrying			Unpaid			Amount Over			Carrying			Unpaid			Amount Over
		Amount			Principal			(Under) Unpaid			Amount			Principal			(Under) Unpaid
								Principal									Principal
Total loans		$	3,844		$	3,693		$	151		$	7,957		$	7,588		$	369
Nonaccrual loans			10			15			(5	)		8			13			(5	)
Loans 90 days or more past due			1			1			–			2			3			(1	)
Disclosures about Fair Value of Financial Instruments
The following table summarizes the estimated fair value for financial instruments as of September 30, 2013 and December 31, 2012, and includes financial instruments that are not accounted for at fair value. In accordance with disclosure guidance related to fair values of financial instruments, the Company did not include assets and liabilities that are not financial instruments, such as the value of goodwill, long-term relationships with deposit, credit card, merchant processing and trust customers, other purchased intangibles, premises and equipment, deferred taxes and other liabilities. Additionally, in accordance with the disclosure guidance, insurance contracts and investments accounted for under the equity method are excluded.
The estimated fair values of the Company’s financial instruments are shown in the table below:
		30-Sep-13															31-Dec-12
		Carrying			Fair Value												Carrying			Fair Value
(Dollars in Millions)		Amount			Level 1			Level 2			Level 3			Total			Amount			Level 1			Level 2			Level 3		Total
Financial Assets
Cash and due from banks		$	11,615		$	11,615		$	–		$	–		$	11,615		$	8,252		$	8,252		$	–		$	–	$	8,252
Federal funds sold and securities purchased under resale agreements			259			–			259			–			259			437			–			437			–		437
Investment securities			36,904			2,912			33,611			109			36,632			34,389			2,984			31,845			123		34,952
held-to-maturity
Loans held for sale (a)			14			–			–			14			14			19			–			–			19		19
Loans (b)			227,027			–			–			228,087			228,087			218,765			–			–			220,354		220,354
Other financial instruments			2,149			–			1,166			1,000			2,166			7,367			–			1,228			6,157		7,385
Financial Liabilities
Deposits			261,716			–			261,792			–			261,792			249,183			–			249,594			–		249,594
Short-term borrowings (c)			25,364			–			25,307			–			25,307			25,901			–			25,917			–		25,917
Long-term debt			18,750			–			19,216			–			19,216			25,516			–			26,205			–		26,205
(a)	Excludes mortgages held for sale for which the fair value option under applicable accounting guidance was elected.
(b)	Excludes loans measured at fair value on a nonrecurring basis.
(c)	Excludes the Company’s obligation on securities sold short required to be accounted for at fair value per applicable accounting guidance.
The fair value of unfunded commitments, standby letters of credit and other guarantees is approximately equal to their carrying value. The carrying value of unfunded commitments and standby letters of credit was $410 million and $415 million at September 30, 2013 and December 31, 2012, respectively. The carrying value of other guarantees was $368 million and $452 million at September 30, 2013 and December 31, 2012, respectively.

Guarantees_and_Contingent_Liab

Guarantees and Contingent Liabilities	9 Months Ended
	Sep. 30, 2013
Commitments And Contingencies Disclosure [Abstract]	'
Guarantees and Contingent Liabilities	'
	Note 14		Guarantees and Contingent Liabilities
	Visa Restructuring and Card Association Litigation The Company’s payment services business issues and acquires credit and debit card transactions through the Visa U.S.A. Inc. card association or its affiliates (collectively “Visa”). In 2007, Visa completed a restructuring and issued shares of Visa Inc. common stock to its financial institution members in contemplation of its initial public offering (“IPO”) completed in the first quarter of 2008 (the “Visa Reorganization”). As a part of the Visa Reorganization, the Company received its proportionate number of shares of Visa Inc. common stock, which were subsequently converted to Class B shares of Visa Inc. (“Class B shares”). Visa U.S.A. Inc. (“Visa U.S.A.”) and MasterCard International (collectively, the “Card Associations”) are defendants in antitrust lawsuits challenging the practices of the Card Associations (the “Visa Litigation”). Visa U.S.A. member banks have a contingent obligation to indemnify Visa Inc. under the Visa U.S.A. bylaws (which were modified at the time of the restructuring in October 2007) for potential losses arising from the Visa Litigation. The indemnification by the Visa U.S.A. member banks has no specific maximum amount.
	Using proceeds from its IPO and through reductions to the conversion ratio applicable to the Class B shares held by Visa U.S.A. member banks, Visa Inc. has funded an escrow account for the benefit of member financial institutions to fund their indemnification obligations associated with the Visa Litigation. The receivable related to the escrow account is classified in other liabilities as a direct offset to the related Visa Litigation contingent liability. On October 19, 2012, Visa signed a settlement agreement to resolve class action claims associated with the multi-district interchange litigation, the largest of the remaining Visa Litigation matters. The settlement has not yet been finally approved by the court, is not yet binding, and has been challenged by some class members. At September 30, 2013, the carrying amount of the Company’s liability related to the Visa Litigation matters, net of its share of the escrow fundings, was $59 million and included the Company’s estimate of its remaining share of the temporary reduction in interchange rates specified in the settlement agreement. The remaining Class B shares held by the Company will be eligible for conversion to Class A shares, and thereby become marketable, upon settlement of the Visa Litigation. These shares are excluded from the Company’s financial instruments disclosures included in Note 13.
	Other Guarantees and Contingent Liabilities
	The following table is a summary of other guarantees and contingent liabilities of the Company at September 30, 2013:
	(Dollars in Millions)		Collateral			Carrying			Maximum
			Held			Amount			Potential
									Future
									Payments
	Standby letters of credit		$	–		$	71		$	17,339
	Third-party borrowing arrangements			–			–			17
	Securities lending indemnifications			5,494			–			5,326
	Asset sales			–			267			3,250	(a)
	Merchant processing			840			69			86,584
	Contingent consideration arrangements			–			14			17
	Tender option bond program guarantee			4,762			–			4,711
	Minimum revenue guarantees			–			12			12
	Other			–			6			553
	(a)	The maximum potential future payments do not include loan sales where the Company provides standard representation and warranties to the buyer against losses related to loan underwriting documentation defects that may have existed at the time of sale that generally are identified after the occurrence of a triggering event such as delinquency. For these types of loan sales, the maximum potential future payments is generally the unpaid principal balance of loans sold measured at the end of the current reporting period. Actual losses will be significantly less than the maximum exposure, as only a fraction of loans sold will have a representation and warranty breach, and any losses on repurchase would generally be mitigated by any collateral held against the loans.
	Merchant Processing The Company, through its subsidiaries, provides merchant processing services. Under the rules of credit card associations, a merchant processor retains a contingent liability for credit card transactions processed. This contingent liability arises in the event of a billing dispute between the merchant and a cardholder that is ultimately resolved in the cardholder’s favor. In this situation, the transaction is “charged-back” to the merchant and the disputed amount is credited or otherwise refunded to the cardholder. If the Company is unable to collect this amount from the merchant, it bears the loss for the amount of the refund paid to the cardholder.
	The Company currently processes card transactions in the United States, Canada, Europe, Mexico and Brazil through wholly-owned subsidiaries and joint ventures with other financial institutions. In the event a merchant was unable to fulfill product or services subject to delayed delivery, such as airline tickets, the Company could become financially liable for refunding tickets purchased through the credit card associations under the charge-back provisions. Charge-back risk related to these merchants is evaluated in a manner similar to credit risk assessments and, as such, merchant processing contracts contain various provisions to protect the Company in the event of default. At September 30, 2013, the value of airline tickets purchased to be delivered at a future date was $6.2 billion. The Company held collateral of $687 million in escrow deposits, letters of credit and indemnities from financial institutions, and liens on various assets.
	Asset Sales The Company regularly sells loans to GSEs as part of its mortgage banking activities. The Company provides customary representation and warranties to the GSEs in conjunction with these sales. These representations and warranties generally require the Company to repurchase assets if it is subsequently determined that a loan did not meet specified criteria, such as a documentation deficiency or rescission of mortgage insurance. If the Company is unable to cure or refute a repurchase request, the Company is generally obligated to repurchase the loan or otherwise reimburse the counterparty for losses. At September 30, 2013, the Company had reserved $176 million for potential losses from representation and warranty obligations, compared with $240 million at December 31, 2012. The Company’s reserve reflects management’s best estimate of losses for representation and warranty obligations. The Company’s reserving methodology uses current information about investor repurchase requests, and assumptions about defect rate, concur rate, repurchase mix, and loss severity, based upon the Company’s most recent loss trends. The Company also considers qualitative factors that may result in anticipated losses differing from historical loss trends, such as loan vintage, underwriting characteristics and macroeconomic trends.
	The following table is a rollforward of the Company’s representation and warranty reserve:
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
	(Dollars in Millions)		2013			2012			2013			2012
	Balance at beginning of period		$	190		$	216		$	240		$	160
	Net realized losses			(13	)		(32	)		(52	)		(88	)
	Change in reserve			(1	)		36			(12	)		148
	Balance at end of period		$	176		$	220		$	176		$	220
	As of September 30, 2013 and December 31, 2012, the Company had $114 million and $131 million, respectively, of unresolved representation and warranty claims from the GSEs. The Company does not have a significant amount of unresolved claims from investors other than the GSEs.
	Litigation and Regulatory Matters The Company is subject to various litigation and regulatory matters that arise in the ordinary course of its business. The Company establishes reserves for such matters when potential losses become probable and can be reasonably estimated. The Company believes the ultimate resolution of existing legal and regulatory matters will not have a material adverse effect on the financial condition, results of operations or cash flows of the Company. However, changes in circumstances or additional information could result in additional accruals or resolution in excess of established accruals, which could adversely affect the Company’s results from operations, potentially materially.
	Certain federal and state governmental authorities reached settlement agreements in 2012 and 2013 with other major financial institutions regarding their mortgage origination, servicing, and foreclosure activities. Those governmental authorities have had settlement discussions with other financial institutions, including the Company. The Company has not agreed to any settlement; however, if a settlement were reached it would likely include an agreement to comply with specified servicing standards, and settlement payments to governmental authorities as well as a monetary commitment that could be satisfied under various loan modification programs (in addition to the programs the Company already has in place).
	The Company is currently subject to other investigations and examinations by government agencies and bank regulators concerning mortgage-related practices, including those related to origination practices for Federal Housing Administration insured residential home loans, compliance with underwriting guidelines relating to residential home loans sold to GSEs, and various practices related to lender-placed insurance. The Company is cooperating fully with these examinations and investigations, any of which could lead to administrative or legal proceedings or settlements involving remedies including fines, penalties, restitution or alterations in the Company’s business practices and in additional costs and expenses.
	Due to their complex nature, it can be years before litigation and regulatory matters are resolved. For those litigation and regulatory matters where the Company has information to develop an estimate or range of loss, the Company believes the upper end of reasonably possible losses in aggregate, in excess of any reserves established for matters where a loss is considered probable, is approximately $200 million. This estimate is subject to significant judgment and uncertainties and the matters underlying the estimate will change from time to time. Actual results may vary significantly from the current estimates.
	For additional information on the nature of the Company’s guarantees and contingent liabilities, refer to Note 21 in the Company’s Annual Report on Form 10-K for the year ended December 31, 2012.

Subsequent_Events

Subsequent Events	9 Months Ended
	Sep. 30, 2013
Subsequent Events [Abstract]	'
Subsequent Events	'
	Note 15	Subsequent Events
	The Company has evaluated the impact of events that have occurred subsequent to September 30, 2013 through the date the consolidated financial statements were filed with the United States Securities and Exchange Commission. Based on this evaluation, the Company has determined none of these events were required to be recognized or disclosed in the consolidated financial statements and related notes.

Basis_of_Presentation_Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2013
Receivables [Abstract]	'
Basis of Presentation	'
	The accompanying consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and, therefore, do not include all information and notes necessary for a complete presentation of financial position, results of operations and cash flow activity required in accordance with accounting principles generally accepted in the United States. In the opinion of management of U.S. Bancorp (the “Company”), all adjustments (consisting only of normal recurring adjustments) necessary for a fair statement of results for the interim periods have been made. These financial statements and notes should be read in conjunction with the consolidated financial statements and notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2012. Certain amounts in prior periods have been reclassified to conform to the current presentation.
	Accounting policies for the lines of business are generally the same as those used in preparation of the consolidated financial statements with respect to activities specifically attributable to each business line. However, the preparation of business line results requires management to establish methodologies to allocate funding costs, expenses and other financial elements to each line of business. Table 10 “Line of Business Financial Performance” included in Management’s Discussion and Analysis provides details of segment results. This information is incorporated by reference into these Notes to Consolidated Financial Statements.
Indemnification Assets Related to FDIC Loss-Sharing Agreements	'
	The Company adopted new indemnification asset accounting guidance effective January 1, 2013 applicable to FDIC loss-sharing agreements. The guidance requires any reduction in expected cash flows from the FDIC resulting from increases in expected cash flows from the covered assets (when there are no previous valuation allowances to reverse) to be amortized over the shorter of the remaining contractual term of the indemnification agreements or the remaining life of the covered assets. Prior to adoption of this guidance, such increases in expected cash flows of purchased loans and decreases in expected cash flows of the FDIC indemnification assets were considered together and recognized over the remaining life of the loans. The adoption of this guidance did not materially affect the Company’s financial statements.

Basis_of_Presentation_Tables

Basis of Presentation (Tables)	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Line of Business Financial Performance	'
	Table 10		Line of Business Financial Performance
			Wholesale Banking and												Consumer and Small
			Commercial Real Estate												Business Banking
	Three Months Ended September 30		2013				2012				Percent				2013				2012				Percent
	(Dollars in Millions)										Change												Change
	Condensed Income Statement
	Net interest income (taxable-equivalent basis)		$	526			$	528				(.4	)%		$	1,141			$	1,193				(4.4	)%
	Noninterest income			267				299				(10.7	)			719				930				(22.7	)
	Securities gains (losses), net			–				–				–				–				–				–
	Total net revenue			793				827				(4.1	)			1,860				2,123				(12.4	)
	Noninterest expense			305				310				(1.6	)			1,150				1,236				(7.0	)
	Other intangibles			2				4				(50.0	)			10				13				(23.1	)
	Total noninterest expense			307				314				(2.2	)			1,160				1,249				(7.1	)
	Income before provision and income taxes			486				513				(5.3	)			700				874				(19.9	)
	Provision for credit losses			(38	)			–				*				160				349				(54.2	)
	Income before income taxes			524				513				2.1				540				525				2.9
	Income taxes and taxable-equivalent adjustment			191				187				2.1				197				191				3.1
	Net income			333				326				2.1				343				334				2.7
	Net (income) loss attributable to noncontrolling interests			–				–				–				–				–				–
	Net income attributable to U.S. Bancorp		$	333			$	326				2.1			$	343			$	334				2.7
	Average Balance Sheet
	Commercial		$	51,409			$	46,131				11.4	%		$	8,475			$	8,423				0.6	%
	Commercial real estate			20,663				19,661				5.1				17,084				16,203				5.4
	Residential mortgages			24				54				(55.6	)			48,131				40,530				18.8
	Credit card			–				–				–				–				–				–
	Other retail			6				7				(14.3	)			44,728				45,653				(2.0	)
	Total loans, excluding covered loans			72,102				65,853				9.5				118,418				110,809				6.9
	Covered loans			340				813				(58.2	)			6,434				7,384				(12.9	)
	Total loans			72,442				66,666				8.7				124,852				118,193				5.6
	Goodwill			1,604				1,604				–				3,515				3,515				–
	Other intangible assets			24				34				(29.4	)			2,650				1,764				50.2
	Assets			78,785				72,579				8.6				139,539				135,715				2.8
	Noninterest-bearing deposits			30,925				31,167				(.8	)			22,460				20,981				7
	Interest checking			10,038				7,897				27.1				32,971				30,020				9.8
	Savings products			15,103				10,358				45.8				46,483				43,647				6.5
	Time deposits			22,376				21,247				5.3				20,716				23,624				(12.3	)
	Total deposits			78,442				70,669				11				122,630				118,272				3.7
	Total U.S. Bancorp shareholders’ equity			7,434				6,378				16.6				12,154				11,551				5.2
			Wholesale Banking and												Consumer and Small
			Commercial Real Estate												Business Banking
	Nine Months Ended September 30		2013				2012				Percent				2013				2012				Percent
	(Dollars in Millions)										Change												Change
	Condensed Income Statement
	Net interest income (taxable-equivalent basis)		$	1,557			$	1,584				(1.7	)%		$	3,427			$	3,555				(3.6	)%
	Noninterest income			819				930				(11.9	)			2,276				2,700				(15.7	)
	Securities gains (losses), net			–				–				–				–				–				–
	Total net revenue			2,376				2,514				(5.5	)			5,703				6,255				(8.8	)
	Noninterest expense			932				950				(1.9	)			3,514				3,618				(2.9	)
	Other intangibles			6				12				(50.0	)			30				39				(23.1	)
	Total noninterest expense			938				962				(2.5	)			3,544				3,657				(3.1	)
	Income before provision and income taxes			1,438				1,552				(7.3	)			2,159				2,598				(16.9	)
	Provision for credit losses			(120	)			3				*				578				878				(34.2	)
	Income before income taxes			1,558				1,549				0.6				1,581				1,720				(8.1	)
	Income taxes and taxable-equivalent adjustment			567				564				0.5				576				626				(8.0	)
	Net income			991				985				0.6				1,005				1,094				(8.1	)
	Net (income) loss attributable to noncontrolling interests			–				–				–				–				–				–
	Net income attributable to U.S. Bancorp		$	991			$	985				0.6			$	1,005			$	1,094				(8.1	)
	Average Balance Sheet
	Commercial		$	50,331			$	44,296				13.6	%		$	8,468			$	8,123				4.2	%
	Commercial real estate			20,305				19,594				3.6				16,806				16,065				4.6
	Residential mortgages			28				61				(54.1	)			46,251				38,884				18.9
	Credit card			–				–				–				–				–				–
	Other retail			9				5				80				44,737				45,602				(1.9	)
Total loans, excluding covered loans			70,673				63,956				10.5				116,262				108,674				7
Covered loans			394				1,010				(61.0	)			6,690				7,629				(12.3	)
Total loans			71,067				64,966				9.4				122,952				116,303				5.7
Goodwill			1,604				1,604				–				3,515				3,515				–
Other intangible assets			26				38				(31.6	)			2,293				1,784				28.5
Assets			77,479				70,806				9.4				139,027				132,973				4.6
Noninterest-bearing deposits			30,407				30,762				(1.2	)			21,843				19,638				11.2
Interest checking			10,385				10,621				(2.2	)			32,801				29,621				10.7
Savings products			13,354				8,962				49				46,061				43,022				7.1
Time deposits			18,459				17,255				7				21,590				24,047				(10.2	)
Total deposits			72,605				67,600				7.4				122,295				116,328				5.1
Total U.S. Bancorp shareholders’ equity			7,331				6,325				15.9				12,062				11,135				8.3
*	Not meaningful
Wealth Management and												Payment												Treasury and									Consolidated
Securities Services												Services												Corporate Support									Company
2013				2012				Percent				2013				2012				Percent				2013			2012			Percent			2013			2012			Percent
								Change												Change										Change									Change
$	85			$	87				(2.3	)%		$	393			$	382				2.9	%		$	569		$	593			(4.0	)%	$	2,714		$	2,783			(2.5	)%
	305				282				8.2				822				854				(3.7	)			67			30			*			2,180			2,395			(9.0	)
	–				–				–				–				–				–				(3	)		1			*			(3	)		1			*
	390				369				5.7				1,215				1,236				(1.7	)			633			624			1.4			4,891			5,179			(5.6	)
	322				288				11.8				493				452				9.1				240			256			(6.3	)		2,510			2,542			(1.3	)
	9				10				(10.0	)			34				40				(15.0	)			–			–			–			55			67			(17.9	)
	331				298				11.1				527				492				7.1				240			256			(6.3	)		2,565			2,609			(1.7	)
	59				71				(16.9	)			688				744				(7.5	)			393			368			6.8			2,326			2,570			(9.5	)
	6				4				50				172				135				27.4				(2	)		–			*			298			488			(38.9	)
	53				67				(20.9	)			516				609				(15.3	)			395			368			7.3			2,028			2,082			(2.6	)
	19				24				(20.8	)			188				222				(15.3	)			3			26			(88.5	)		598			650			(8.0	)
	34				43				(20.9	)			328				387				(15.2	)			392			342			14.6			1,430			1,432			(.1	)
	–				–				–				(10	)			(10	)			–				48			52			(7.7	)		38			42			(9.5	)
$	34			$	43				(20.9	)		$	318			$	377				(15.6	)		$	440		$	394			11.7		$	1,468		$	1,474			(.4	)
$	1,774			$	1,361				30.3	%		$	6,191			$	6,062				2.1	%		$	215		$	215			–	%	$	68,064		$	62,192			9.4	%
	653				624				4.6				–				–				–				101			142			(28.9	)		38,501			36,630			5.1
	983				384				*				–				–				–				1			1			–			49,139			40,969			19.9
	–				–				–				16,931				16,551				2.3				–			–			–			16,931			16,551			2.3
	1,531				1,529				0.1				729				802				(9.1	)			–			–			–			46,994			47,991			(2.1	)
	4,941				3,898				26.8				23,851				23,415				1.9				317			358			(11.5	)		219,629			204,333			7.5
	17				11				54.5				5				5				–				2,937			4,382			(33.0	)		9,733			12,595			(22.7	)
	4,958				3,909				26.8				23,856				23,420				1.9				3,254			4,740			(31.4	)		229,362			216,928			5.7
	1,533				1,469				4.4				2,509				2,346				6.9				–			–			–			9,161			8,934			2.5
	166				165				0.6				557				646				(13.8	)			2			4			(50.0	)		3,399			2,613			30.1
	7,749				6,688				15.9				30,123				29,517				2.1				95,965			101,154			(5.1	)		352,161			345,653			1.9
	13,510				14,862				(9.1	)			714				623				14.6				655			494			32.6			68,264			68,127			0.2
	4,770				3,943				21				455				1,346				(66.2	)			1			1			–			48,235			43,207			11.6
	26,339				23,089				14.1				60				40				50				80			139			(42.4	)		88,065			77,273			14
	4,170				5,463				(23.7	)			–				–				–				542			340			59.4			47,804			50,674			(5.7	)
	48,789				47,357				3				1,229				2,009				(38.8	)			1,278			974			31.2			252,368			239,281			5.5
	2,398				2,240				7.1				6,102				5,667				7.7				11,848			12,783			(7.3	)		39,936			38,619			3.4
Wealth Management and												Payment												Treasury and									Consolidated
Securities Services												Services												Corporate Support									Company
2013				2012				Percent				2013				2012				Percent				2013			2012			Percent			2013			2012			Percent
								Change												Change										Change									Change
$	267			$	264				1.1	%		$	1,168			$	1,154				1.2	%		$	1,676		$	1,629			2.9	%	$	8,095		$	8,186			(1.1	)%
	910				827				10				2,397				2,402				(.2	)			208			149			39.6			6,610			7,008			(5.7	)
	–				–				–				–				–				–				8			(18	)		*			8			(18	)		*
	1,177				1,091				7.9				3,565				3,556				0.3				1,892			1,760			7.5			14,713			15,176			(3.1	)
	962				854				12.6				1,454				1,344				8.2				563			796			(29.3	)		7,425			7,562			(1.8	)
	27				30				(10.0	)			104				127				(18.1	)			–			–			–			167			208			(19.7	)
	989				884				11.9				1,558				1,471				5.9				563			796			(29.3	)		7,592			7,770			(2.3	)
	188				207				(9.2	)			2,007				2,085				(3.7	)			1,329			964			37.9			7,121			7,406			(3.8	)
	7				5				40				553				548				0.9				45			5			*			1,063			1,439			(26.1	)
	181				202				(10.4	)			1,454				1,537				(5.4	)			1,284			959			33.9			6,058			5,967			1.5
	65				73				(11.0	)			529				560				(5.5	)			60			29			*			1,797			1,852			(3.0	)
	116				129				(10.1	)			925				977				(5.3	)			1,224			930			31.6			4,261			4,115			3.5
	–				–				–				(29	)			(30	)			3.3				148			142			4.2			119			112			6.3
$	116			$	129				(10.1	)		$	896			$	947				(5.4	)		$	1,372		$	1,072			28		$	4,380		$	4,227			3.6
$	1,687			$	1,264				33.5	%		$	6,030			$	5,904				2.1	%		$	203		$	203			–	%	$	66,719		$	59,790			11.6	%
	654				607				7.7				–				–				–				107			123			(13.0	)		37,872			36,389			4.1
	775				379				*				–				–				–				1			4			(75.0	)		47,055			39,328			19.6
	–				–				–				16,627				16,675				(.3	)			–			–			–			16,627			16,675			(.3	)
	1,544				1,516				1.8				744				817				(8.9	)			–			–			–			47,034			47,940			(1.9	)
	4,660				3,766				23.7				23,401				23,396				–				311			330			(5.8	)		215,307			200,122			7.6
	14				12				16.7				5				5				–				3,272			4,953			(33.9	)		10,375			13,609			(23.8	)
	4,674				3,778				23.7				23,406				23,401				–				3,583			5,283			(32.2	)		225,682			213,731			5.6
	1,529				1,468				4.2				2,509				2,349				6.8				–			–			–			9,157			8,936			2.5
	174				172				1.2				584				717				(18.5	)			2			4			(50.0	)		3,079			2,715			13.4
	7,513				6,477				16				29,659				29,684				(.1	)			97,370			100,867			(3.5	)		351,048			340,807			3
	13,807				13,904				(.7	)			694				638				8.8				432			481			(10.2	)		67,183			65,423			2.7
	4,716				3,950				19.4				444				1,329				(66.6	)			1			1			–			48,347			45,522			6.2
	27,081				23,203				16.7				54				37				45.9				85			136			(37.5	)		86,635			75,360			15
	5,228				4,892				6.9				–				–				–				842			479			75.8			46,119			46,673			(1.2	)
	50,832				45,949				10.6				1,192				2,004				(40.5	)			1,360			1,097			24			248,284			232,978			6.6
	2,375				2,223				6.8				6,033				5,698				5.9				11,874			11,724			1.3			39,675			37,105			6.9

Investment_Securities_Tables

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2013
Investments Debt And Equity Securities [Abstract]	'
Investment Securities	'
	Table 4		Investment Securities
			Available-for-Sale																Held-to-Maturity
	At September 30, 2013 (Dollars in Millions)		Amortized				Fair				Weighted-				Weighted-				Amortized				Fair				Weighted-		Weighted-
			Cost				Value				Average				Average				Cost				Value				Average		Average
											Maturity in				Yield (e)												Maturity in		Yield (e)
											Years																Years
	U.S. Treasury and Agencies
	Maturing in one year or less		$	578			$	578				0.2				0.95	%		$	2,112			$	2,120				0.4		0.98	%
	Maturing after one year through five years			48				51				3.1				3.39				80				81				1.7		1.36
	Maturing after five years through ten years			740				703				8.9				2.11				1,116				1,056				8.7		1.99
	Maturing after ten years			201				189				12.1				1.84				60				60				11.4		1.77
	Total		$	1,567			$	1,521				5.9				1.69	%		$	3,368			$	3,317				3.4		1.34	%
	Mortgage-Backed Securities (a)
	Maturing in one year or less		$	482			$	486				0.7				1.98	%		$	23			$	23				0.6		2.13	%
	Maturing after one year through five years			16,679				16,697				3.8				2.17				23,127				23,060				3.6		2.17
	Maturing after five years through ten years			11,086				11,126				5.9				1.9				9,496				9,331				5.6		1.75
	Maturing after ten years			1,874				1,883				12.8				1.23				734				746				12.2		1.27
	Total		$	30,121			$	30,192				5.1				2.01	%		$	33,380			$	33,160				4.3		2.03	%
	Asset-Backed Securities (a)
	Maturing in one year or less		$	–			$	–				–				7.65	%		$	–			$	–				0.3		0.41	%
	Maturing after one year through five years			56				62				2.7				2.58				11				14				3.6		0.85
	Maturing after five years through ten years			562				573				6.8				2.66				5				5				6.7		0.9
	Maturing after ten years			–				–				17.8				5.19				2				10				21.3		0.77
	Total		$	618			$	635				6.4				2.66	%		$	18			$	29				6.3		0.85	%
	Obligations of State and Political Subdivisions (b) (c)
	Maturing in one year or less		$	62			$	63				0.5				6.16	%		$	–			$	–				0.5		7.31	%
	Maturing after one year through five years			4,810				4,930				2.9				6.73				3				3				2.2		9.29
	Maturing after five years through ten years			486				477				7				5.81				2				2				7.4		7.74
	Maturing after ten years			374				350				20.2				6.14				12				12				14		5.34
	Total		$	5,732			$	5,820				4.3				6.61	%		$	17			$	17				11.2		6.24	%
	Other Debt Securities
	Maturing in one year or less		$	6			$	6				0.4				1.16	%		$	4			$	4				0.6		1.46	%
	Maturing after one year through five years			–				–				–				–				91				91				2.3		1.15
	Maturing after five years through ten years			–				–				–				–				26				14				7.1		1.01
	Maturing after ten years			734				642				21.8				2.73				–				–				–		–
	Total		$	740			$	648				21.6				2.71	%		$	121			$	109				3.3		1.13	%
	Other Investments		$	462			$	491				14				2.12	%		$	–			$	–				–		–	%
	Total investment securities (d)		$	39,240			$	39,307				5.5				2.7	%		$	36,904			$	36,632				4.2		1.97	%
	(a)	Information related to asset and mortgage-backed securities included above is presented based upon weighted-average maturities anticipating future prepayments.
	(b)	Information related to obligations of state and political subdivisions is presented based upon yield to first optional call date if the security is purchased at a premium, yield to maturity if purchased at par or a discount.
	(c)	Maturity calculations for obligations of state and political subdivisions are based on the first optional call date for securities with a fair value above par and contractual maturity for securities with a fair value equal to or below par.
	(d)	The weighted-average maturity of the available-for-sale investment securities was 4.1 years at December 31, 2012, with a corresponding weighted-average yield of 2.93 percent. The weighted-average maturity of the held-to-maturity investment securities was 3.3 years at December 31, 2012, with a corresponding weighted-average yield of 1.94 percent. The increases in the weighted-average maturities from December 31, 2012 to September 30, 2013 related to the impact of higher interest rates on anticipated prepayments on mortgage-backed securities.
	(e)	Average yields are presented on a fully-taxable equivalent basis under a tax rate of 35 percent. Yields on available-for-sale and held-to-maturity investment securities are computed based on amortized cost balances, excluding any premiums or discounts recorded related to the transfer of investment securities at fair value from available-for-sale to held-to-maturity. Average yield and maturity calculations exclude equity securities that have no stated yield or maturity.
			30-Sep-13								31-Dec-12
	(Dollars in Millions)		Amortized				Percent				Amortized				Percent
			Cost				of Total				Cost				of Total
	U.S. Treasury and agencies		$	4,935				6.5	%		$	4,365				5.9	%
	Mortgage-backed securities			63,501				83.4				61,019				83.1
	Asset-backed securities			636				0.8				637				0.9
	Obligations of state and political subdivisions			5,749				7.6				6,079				8.3
	Other debt securities and investments			1,323				1.7				1,329				1.8
	Total investment securities		$	76,144				100	%		$	73,429				100	%
Investment Securities Held to Maturity and Available for Sale	'
	The amortized cost, other-than-temporary impairment recorded in other comprehensive income (loss), gross unrealized holding gains and losses, and fair value of held-to-maturity and available-for-sale investment securities were as follows:
			September 30, 2013																				December 31, 2012
											Unrealized Losses																		Unrealized Losses
	(Dollars in Millions)		Amortized				Unrealized				Other-than-				Other (f)				Fair				Amortized				Unrealized		Other-than-			Other (f)			Fair
			Cost				Gains				Temporary (e)								Value				Cost				Gains		Temporary (e)						Value
	Held-to-maturity (a)
	U.S. Treasury and agencies		$	3,368			$	9			$	–			$	(60	)		$	3,317			$	3,154			$	27	$	–		$	–		$	3,181
	Mortgage-backed securities
	Residential
	Agency			33,378				234				–				(454	)			33,158				31,064				545		–			(6	)		31,603
	Non-agency non-prime (d)			1				–				–				–				1				1				–		–			–			1
	Commercial non-agency			1				–				–				–				1				2				–		–			–			2
	Asset-backed securities
	Collateralized debt obligations/Collateralized loan obligations			2				9				–				–				11				7				15		–			–			22
	Other			16				4				(1	)			(1	)			18				19				2		(3	)		(1	)		17
	Obligations of state and political subdivisions			17				–				–				–				17				20				1		–			–			21
	Obligations of foreign governments			7				–				–				–				7				7				–		–			–			7
	Other debt securities			114				–				–				(12	)			102				115				–		–			(17	)		98
	Total held-to-maturity		$	36,904			$	256			$	(1	)		$	(527	)		$	36,632			$	34,389			$	590	$	(3	)	$	(24	)	$	34,952
	Available-for-sale (b)
	U.S. Treasury and agencies		$	1,567			$	5			$	–			$	(51	)		$	1,521			$	1,211			$	16	$	–		$	(1	)	$	1,226
	Mortgage-backed securities
	Residential
	Agency			29,136				476				–				(392	)			29,220				28,754				746		–			(5	)		29,495
	Non-agency
	Prime (c)			513				2				(10	)			(5	)			500				641				3		(16	)		(4	)		624
	Non-prime (d)			307				3				(6	)			(1	)			303				372				4		(20	)		(1	)		355
	Commercial agency			165				4				–				–				169				185				8		–			–			193
	Asset-backed securities
	Collateralized debt obligations/Collateralized loan obligations			20				5				–				–				25				32				10		–			–			42
	Other			598				13				–				(1	)			610				579				14		–			(1	)		592
	Obligations of state and political subdivisions			5,732				134				–				(46	)			5,820				6,059				396		–			–			6,455
	Obligations of foreign governments			6				–				–				–				6				6				–		–			–			6
	Corporate debt securities			734				–				–				(92	)			642				814				2		–			(85	)		731
	Perpetual preferred securities			205				24				–				(20	)			209				205				27		–			(14	)		218
	Other investments			257				25				–				–				282				182				20		–			–			202
	Total available-for-sale		$	39,240			$	691			$	(16	)		$	(608	)		$	39,307			$	39,040			$	1,246	$	(36	)	$	(111	)	$	40,139
	(a)	Held-to-maturity investment securities are carried at historical cost or at fair value at the time of transfer from the available-for-sale to held-to-maturity category, adjusted for amortization of premiums and accretion of discounts and credit-related other-than-temporary impairment.
	(b)	Available-for-sale investment securities are carried at fair value with unrealized net gains or losses reported within accumulated other comprehensive income (loss) in shareholders’ equity.
	(c)	Prime securities are those designated as such by the issuer at origination. When an issuer designation is unavailable, the Company determines at acquisition date the categorization based on asset pool characteristics (such as weighted-average credit score, loan-to-value, loan type, prevalence of low documentation loans) and deal performance (such as pool delinquencies and security market spreads). When the Company determines the designation, prime securities typically have a weighted average credit score of 725 or higher and a loan-to-value of 80 percent or lower; however, other pool characteristics may result in designations that deviate from these credit score and loan-to-value thresholds.
	(d)	Includes all securities not meeting the conditions to be designated as prime.
	(e)	Represents impairment not related to credit for those investment securities that have been determined to be other-than-temporarily impaired.
	(f)	Represents unrealized losses on investment securities that have not been determined to be other-than-temporarily impaired.
Amount of Interest Income from Taxable and Non-Taxable Investment Securities	'
	The following table provides information about the amount of interest income from taxable and non-taxable investment securities:
			Three Months Ended								Nine Months Ended
			September 30,								September 30,
	(Dollars in Millions)		2013				2012				2013				2012
	Taxable		$	357			$	369			$	1,029			$	1,166
	Non-taxable			63				69				193				210
	Total interest income from investment securities		$	420			$	438			$	1,222			$	1,376
Amount of Gross Gains and Losses Realized through Sales of Available for Sale Investment Securities	'
	The following table provides information about the amount of gross gains and losses realized through the sales of available-for-sale investment securities:
			Three Months Ended								Nine Months Ended
			September 30,								September 30,
	(Dollars in Millions)		2013				2012				2013				2012
	Realized gains		$	–			$	115			$	21			$	145
	Realized losses			–				(99	)			–				(99	)
	Net realized gains (losses)		$	–			$	16			$	21			$	46
	Income tax (benefit) on net realized gains (losses)		$	–			$	7			$	8			$	18
Summary of Other than Temporary Impairment by Investment Category	'
	The following tables summarize other-than-temporary impairment by investment category:
			2013														2012
	Three Months Ended September 30				Losses				Other Gains				Total				Losses				Other Gains				Total
	(Dollars in Millions)				Recorded in				(Losses) (c)								Recorded in				(Losses) (c)
					Earnings												Earnings
	Available-for-sale
	Mortgage-backed securities
	Non-agency residential
	Prime (a)				$	(1	)		$	–			$	(1	)		$	(5	)		$	(3	)		$	(8	)
	Non-prime (b)					(2	)			1				(1	)			(10	)			5				(5	)
	Total available-for-sale				$	(3	)		$	1			$	(2	)		$	(15	)		$	2			$	(13	)
	(a)	Prime securities are those designated as such by the issuer at origination. When an issuer designation is unavailable, the Company determines at acquisition date the categorization based on asset pool characteristics (such as weighted-average credit score, loan-to-value, loan type, prevalence of low documentation loans) and deal performance (such as pool delinquencies and security market spreads).
	(b)	Includes all securities not meeting the conditions to be designated as prime.
	(c)	Losses represent the non-credit portion of other-than-temporary impairment recorded in other comprehensive income (loss) for investment securities determined to be other-than-temporarily impaired during the period. Gains represent recoveries in the fair value of securities that had non-credit other-than-temporary impairment during the period.
			2013														2012
	Nine Months Ended September 30				Losses				Other Gains				Total				Losses				Other Gains				Total
	(Dollars in Millions)				Recorded in				(Losses) (c)								Recorded in				(Losses) (c)
					Earnings												Earnings
	Available-for-sale
	Mortgage-backed securities
	Non-agency residential
	Prime (a)				$	(5	)		$	2			$	(3	)		$	(8	)		$	(12	)		$	(20	)
	Non-prime (b)					(8	)			6				(2	)			(27	)			15				(12	)
	Commercial non-agency					–				–				–				(1	)			(1	)			(2	)
	Other asset-backed securities					–				–				–				(1	)			1				–
	Perpetual preferred securities					–				–				–				(27	)			–				(27	)
	Total available-for-sale				$	(13	)		$	8			$	(5	)		$	(64	)		$	3			$	(61	)
	(a)	Prime securities are those designated as such by the issuer at origination. When an issuer designation is unavailable, the Company determines at acquisition date the categorization based on asset pool characteristics (such as weighted-average credit score, loan-to-value, loan type, prevalence of low documentation loans) and deal performance (such as pool delinquencies and security market spreads).
	(b)	Includes all securities not meeting the conditions to be designated as prime.
	(c)	Losses represent the non-credit portion of other-than-temporary impairment recorded in other comprehensive income (loss) for investment securities determined to be other-than-temporarily impaired during the period. Gains represent recoveries in the fair value of securities that had non-credit other-than-temporary impairment during the period.
Summary of Ranges used in Valuation of Non-Agency Mortgage-Backed Securities Other than Temporarily Impaired	'
	The following table includes the ranges for principal assumptions used for those available-for-sale non-agency mortgage-backed securities determined to be other-than-temporarily impaired:
			Prime (a)												Non-Prime (b)
			Minimum				Maximum				Average				Minimum				Maximum				Average
	September 30, 2013
	Estimated lifetime prepayment rates			12	%			18	%			13	%			4	%			10	%			6	%
	Lifetime probability of default rates			3				5				4				5				10				7
	Lifetime loss severity rates			25				50				48				15				60				51
	December 31, 2012
	Estimated lifetime prepayment rates			6	%			22	%			14	%			3	%			10	%			6	%
	Lifetime probability of default rates			3				6				4				3				10				7
	Lifetime loss severity rates			40				50				47				45				65				56
	(a)	Prime securities are those designated as such by the issuer at origination. When an issuer designation is unavailable, the Company determines at acquisition date the categorization based on asset pool characteristics (such as weighted-average credit score, loan-to-value, loan type, prevalence of low documentation loans) and deal performance (such as pool delinquencies and security market spreads).
	(b)	Includes all securities not meeting the conditions to be designated as prime.
Changes in Credit Losses on Debt Securities	'
	Changes in the credit losses on debt securities (excluding perpetual preferred securities) are summarized as follows:
			Three Months Ended								Nine Months Ended
			September 30,								September 30,
	(Dollars in Millions)		2013				2012				2013				2012
	Balance at beginning of period		$	124			$	277			$	134			$	298
	Additions to Credit Losses Due to Other-than-temporary Impairments
	Credit losses on securities not previously considered other-than-temporarily impaired			–				2				–				5
	Decreases in expected cash flows on securities for which other-than-temporary impairment was previously recognized			3				13				13				32
	Total other-than-temporary impairment on debt securities			3				15				13				37
	Other Changes in Credit Losses
	Increases in expected cash flows			(1	)			–				(2	)			(14	)
	Realized losses (a)			(4	)			(4	)			(18	)			(33	)
	Credit losses on security sales and securities expected to be sold			–				(142	)			(5	)			(142	)
	Balance at end of period		$	122			$	146			$	122			$	146
	(a)	Primarily represents principal losses allocated to mortgage and asset-backed securities in the Company’s portfolio under the terms of the securitization transaction documents.
Gross Unrealized Losses and Fair Value of Company's Investments with Unrealized Losses	'
	At September 30, 2013, certain investment securities had a fair value below amortized cost. The following table shows the gross unrealized losses and fair value of the Company’s investment securities with unrealized losses, aggregated by investment category and length of time the individual investment securities have been in continuous unrealized loss positions, at September 30, 2013:
			Less Than 12 Months								12 Months or Greater								Total
	(Dollars in Millions)		Fair				Unrealized				Fair				Unrealized				Fair				Unrealized
			Value				Losses				Value				Losses				Value				Losses
	Held-to-maturity
	U.S. Treasury and agencies		$	1,056			$	(60	)		$	–			$	–			$	1,056			$	(60	)
	Mortgage-backed securities
	Residential agency			20,034				(452	)			85				(2	)			20,119				(454	)
	Commercial non-agency			1				–				–				–				1				–
	Other asset-backed securities			–				–				10				(2	)			10				(2	)
	Obligations of state and political subdivisions			8				–				–				–				8				–
	Other debt securities			–				–				13				(12	)			13				(12	)
	Total held-to-maturity		$	21,099			$	(512	)		$	108			$	(16	)		$	21,207			$	(528	)
	Available-for-sale
	U.S. Treasury and agencies		$	853			$	(51	)		$	–			$	–			$	853			$	(51	)
	Mortgage-backed securities
	Residential
	Agency			13,540				(389	)			343				(3	)			13,883				(392	)
	Non-agency (a)
	Prime (b)			137				(2	)			206				(13	)			343				(15	)
	Non-prime (c)			128				(2	)			81				(5	)			209				(7	)
	Commercial agency			61				–				–				–				61				–
	Other asset-backed securities			25				(1	)			3				–				28				(1	)
	Obligations of state and political subdivisions			1,382				(46	)			10				–				1,392				(46	)
	Corporate debt securities			214				(5	)			420				(87	)			634				(92	)
	Perpetual preferred securities			–				–				112				(20	)			112				(20	)
	Total available-for-sale		$	16,340			$	(496	)		$	1,175			$	(128	)		$	17,515			$	(624	)
	(a)	The Company has $22 million of unrealized losses on residential non-agency mortgage-backed securities. Credit-related other-than-temporary impairment on these securities may occur if there is further deterioration in the underlying collateral pool performance. Borrower defaults may increase if economic conditions worsen. Additionally, deterioration in home prices may increase the severity of projected losses.
	(b)	Prime securities are those designated as such by the issuer at origination. When an issuer designation is unavailable, the Company determines at acquisition date the categorization based on asset pool characteristics (such as weighted-average credit score, loan-to-value, loan type, prevalence of low documentation loans) and deal performance (such as pool delinquencies and security market spreads).
	(c)	Includes all securities not meeting the conditions to be designated as prime.

Loans_and_Allowance_for_Credit1

Loans and Allowance for Credit Losses (Tables)	9 Months Ended
	Sep. 30, 2013
Receivables [Abstract]	'
Composition of Loan Portfolio	'
	The composition of the loan portfolio, disaggregated by class and underlying specific portfolio type, was as follows:
			September 30, 2013						December 31, 2012
	(Dollars in Millions)		Amount			Percent			Amount			Percent
						of Total						of Total
	Commercial
	Commercial		$	63,696			27.5	%	$	60,742			27.2	%
	Lease financing			5,262			2.3			5,481			2.5
	Total commercial			68,958			29.8			66,223			29.7
	Commercial Real Estate
	Commercial mortgages			31,467			13.6			31,005			13.9
	Construction and development			7,211			3.1			5,948			2.6
	Total commercial real estate			38,678			16.7			36,953			16.5
	Residential Mortgages
	Residential mortgages			36,484			15.8			32,648			14.6
	Home equity loans, first liens			13,686			5.9			11,370			5.1
	Total residential mortgages			50,170			21.7			44,018			19.7
	Credit Card			17,063			7.4			17,115			7.7
	Other Retail
	Retail leasing			5,761			2.5			5,419			2.4
	Home equity and second mortgages			15,544			6.7			16,726			7.5
	Revolving credit			3,289			1.4			3,332			1.5
	Installment			5,717			2.4			5,463			2.4
	Automobile			13,130			5.7			12,593			5.6
	Student			3,673			1.6			4,179			1.9
	Total other retail			47,114			20.3			47,712			21.3
	Total loans, excluding covered loans			221,983			95.9			212,021			94.9
	Covered Loans			9,396			4.1			11,308			5.1
	Total loans		$	231,379			100	%	$	223,329			100	%
Changes in Accretable Balance for Purchased Impaired Loans	'
	Changes in the accretable balance for purchased impaired loans were as follows:
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
	(Dollars in Millions)		2013			2012			2013			2012
	Balance at beginning of period		$	1,802		$	2,431		$	1,709		$	2,619
	Purchases			–			–			–			13
	Accretion			(119	)		(109	)		(380	)		(337	)
	Disposals			(51	)		(37	)		(120	)		(135	)
	Reclassifications (to)/from nonaccretable difference (a)			119			58			177			191
	Other (b)			–			(14	)		365			(22	)
	Balance at end of period		$	1,751		$	2,329		$	1,751		$	2,329
	(a)	Primarily relates to changes in expected credit performance.
	(b)	The amount for the nine months ended September 30, 2013, primarily represents the reclassification of unamortized decreases in the FDIC asset (which are now presented as a separate component within the covered assets table on page 55), partially offset by the impact of changes in expectations about retaining covered single-family loans beyond the term of the indemnification agreements.
Activity in Allowance for Credit Losses	'
	Activity in the allowance for credit losses by portfolio class was as follows:
	Three Months Ended September 30		Commercial			Commercial			Residential			Credit			Other			Total Loans,			Covered			Total
	(Dollars in Millions)					Real Estate			Mortgages			Card			Retail			Excluding			Loans			Loans
																		Covered
																		Loans
	2013
	Balance at beginning of period		$	1,023		$	777		$	921		$	874		$	838		$	4,433		$	179		$	4,612
	Add
	Provision for credit losses			19			(22	)		70			151			84			302			(4	)		298
	Deduct
	Loans charged off			65			17			62			175			122			441			9			450
	Less recoveries of loans charged off			(54	)		(23	)		(5	)		(15	)		(24	)		(121	)		(1	)		(122	)
	Net loans charged off			11			(6	)		57			160			98			320			8			328
	Other changes (a)			–			–			–			–			–			–			(4	)		(4	)
	Balance at end of period		$	1,031		$	761		$	934		$	865		$	824		$	4,415		$	163		$	4,578
	2012
	Balance at beginning of period		$	1,037		$	941		$	939		$	996		$	828		$	4,741		$	123		$	4,864
	Add
	Provision for credit losses			63			(22	)		143			119			185			488			–			488
	Deduct
	Loans charged off			90			47			127			186			187			637			2			639
	Less recoveries of loans charged off			(24	)		(22	)		(6	)		(19	)		(30	)		(101	)		–			(101	)
	Net loans charged off			66			25			121			167			157			536			2			538
	Other changes (a)			–			–			–			(33	)		–			(33	)		(10	)		(43	)
	Balance at end of period		$	1,034		$	894		$	961		$	915		$	856		$	4,660		$	111		$	4,771
	(a)	Includes net changes in credit losses to be reimbursed by the FDIC and for the three months ended September 30, 2013, reductions in the allowance for covered loans where the reversal of a previously recorded allowance was offset by an associated decrease in the indemnification asset.
	Nine Months Ended September 30		Commercial			Commercial			Residential			Credit			Other			Total Loans,			Covered			Total
	(Dollars in Millions)					Real Estate			Mortgages			Card			Retail			Excluding			Loans			Loans
																		Covered
																		Loans
	2013
	Balance at beginning of period		$	1,051		$	857		$	935		$	863		$	848		$	4,554		$	179		$	4,733
	Add
	Provision for credit losses			64			(100	)		222			495			305			986			77			1,063
	Deduct
	Loans charged off			184			76			243			559			412			1,474			31			1,505
	Less recoveries of loans charged off			(100	)		(80	)		(20	)		(66	)		(83	)		(349	)		(3	)		(352	)
	Net loans charged off			84			(4	)		223			493			329			1,125			28			1,153
	Other changes (a)			–			–			–			–			–			–			(65	)		(65	)
	Balance at end of period		$	1,031		$	761		$	934		$	865		$	824		$	4,415		$	163		$	4,578
	2012
	Balance at beginning of period		$	1,010		$	1,154		$	927		$	992		$	831		$	4,914		$	100		$	5,014
	Add
	Provision for credit losses			247			(111	)		376			462			431			1,405			34			1,439
	Deduct
	Loans charged off			296			206			357			585			503			1,947			4			1,951
	Less recoveries of loans charged off			(73	)		(57	)		(15	)		(79	)		(97	)		(321	)		(1	)		(322	)
	Net loans charged off			223			149			342			506			406			1,626			3			1,629
	Other changes (a)			–			–			–			(33	)		–			(33	)		(20	)		(53	)
	Balance at end of period		$	1,034		$	894		$	961		$	915		$	856		$	4,660		$	111		$	4,771
	(a)	Includes net changes in credit losses to be reimbursed by the FDIC and for the nine months ended September 30, 2013, reductions in the allowance for covered loans where the reversal of a previously recorded allowance was offset by an associated decrease in the indemnification asset.
Additional Detail of Allowance for Credit Losses and Related Loan Balances by Portfolio Type	'
	Additional detail of the allowance for credit losses by portfolio class was as follows:
	(Dollars in Millions)		Commercial			Commercial			Residential			Credit			Other			Total Loans,			Covered			Total
						Real Estate			Mortgages			Card			Retail			Excluding			Loans			Loans
																		Covered
																		Loans
	Allowance Balance at September 30, 2013 Related to
	Loans individually evaluated for impairment (a)		$	9		$	7		$	–		$	–		$	–		$	16		$	–		$	16
	TDRs collectively evaluated for impairment			21			21			341			101			83			567			5			572
	Other loans collectively evaluated for impairment			1,001			719			593			764			741			3,818			10			3,828
	Loans acquired with deteriorated credit quality			–			14			–			–			–			14			148			162
	Total allowance for credit losses		$	1,031		$	761		$	934		$	865		$	824		$	4,415		$	163		$	4,578
	Allowance Balance at December 31, 2012 Related to
	Loans individually evaluated for impairment (a)		$	10		$	30		$	–		$	–		$	–		$	40		$	–		$	40
	TDRs collectively evaluated for impairment			28			29			446			153			97			753			1			754
	Other loans collectively evaluated for impairment			1,013			791			489			710			751			3,754			17			3,771
	Loans acquired with deteriorated credit quality			–			7			–			–			–			7			161			168
	Total allowance for credit losses		$	1,051		$	857		$	935		$	863		$	848		$	4,554		$	179		$	4,733
	(a)	Represents the allowance for credit losses related to loans greater than $5 million classified as nonperforming or TDRs.
	Additional detail of loan balances by portfolio class was as follows:
	(Dollars in Millions)		Commercial			Commercial			Residential			Credit			Other			Total Loans,			Covered			Total
						Real Estate			Mortgages			Card			Retail			Excluding			Loans (b)			Loans
																		Covered
																		Loans
	30-Sep-13
	Loans individually evaluated for impairment (a)		$	171		$	253		$	–		$	–		$	–		$	424		$	48		$	472
	TDRs collectively evaluated for impairment			171			360			4,357			335			281			5,504			100			5,604
	Other loans collectively evaluated for impairment			68,615			37,979			45,812			16,728			46,833			215,967			5,172			221,139
	Loans acquired with deteriorated credit quality			1			86			1			–			–			88			4,076			4,164
	Total loans		$	68,958		$	38,678		$	50,170		$	17,063		$	47,114		$	221,983		$	9,396		$	231,379
	31-Dec-12
	Loans individually evaluated for impairment (a)		$	171		$	510		$	–		$	–		$	–		$	681		$	48		$	729
	TDRs collectively evaluated for impairment			185			391			4,199			442			313			5,530			145			5,675
	Other loans collectively evaluated for impairment			65,863			35,952			39,813			16,673			47,399			205,700			5,814			211,514
	Loans acquired with deteriorated credit quality			4			100			6			–			–			110			5,301			5,411
	Total loans		$	66,223		$	36,953		$	44,018		$	17,115		$	47,712		$	212,021		$	11,308		$	223,329
	(a)	Represents loans greater than $5 million classified as nonperforming or TDRs.
	(b)	Includes expected reimbursements from the FDIC under loss sharing agreements.
Summary of Loans by Portfolio Type and Delinquency Status	'
	The following table provides a summary of loans by portfolio class, including the delinquency status of those that continue to accrue interest, and those that are nonperforming:
			Accruing
	(Dollars in Millions)		Current			30-89 Days			90 Days or			Nonperforming			Total
						Past Due			More Past Due
	September 30, 2013
	Commercial		$	68,573		$	219		$	50		$	116		$	68,958
	Commercial real estate			38,253			62			7			356			38,678
	Residential mortgages (a)			48,820			350			268			732			50,170
	Credit card			16,567			212			190			94			17,063
	Other retail			46,598			234			76			206			47,114
	Total loans, excluding covered loans			218,811			1,077			591			1,504			221,983
	Covered loans			8,584			142			514			156			9,396
	Total loans		$	227,395		$	1,219		$	1,105		$	1,660		$	231,379
	December 31, 2012
	Commercial		$	65,701		$	341		$	58		$	123		$	66,223
	Commercial real estate			36,241			158			8			546			36,953
	Residential mortgages (a)			42,728			348			281			661			44,018
	Credit card			16,525			227			217			146			17,115
	Other retail			47,109			290			96			217			47,712
	Total loans, excluding covered loans			208,304			1,364			660			1,693			212,021
	Covered loans			9,900			359			663			386			11,308
	Total loans		$	218,204		$	1,723		$	1,323		$	2,079		$	223,329
	(a)	At September 30, 2013, $399 million of loans 30–89 days past due and $3.5 billion of loans 90 days or more past due purchased from Government National Mortgage Association (“GNMA”) mortgage pools whose repayments are insured by the Federal Housing Administration or guaranteed by the Department of Veterans Affairs, were classified as current, compared with $441 million and $3.2 billion at December 31, 2012, respectively.
Summary of Loans by Portfolio Type and Company's Internal Credit Quality Rating	'
	The following table provides a summary of loans by portfolio class and the Company’s internal credit quality rating:
						Criticized
	(Dollars in Millions)		Pass			Special			Classified (a)			Total			Total
						Mention						Criticized
	September 30, 2013
	Commercial		$	66,791		$	1,103		$	1,064		$	2,167		$	68,958
	Commercial real estate			36,796			578			1,304			1,882			38,678
	Residential mortgages (b)			49,052			6			1,112			1,118			50,170
	Credit card			16,779			–			284			284			17,063
	Other retail			46,744			34			336			370			47,114
	Total loans, excluding covered loans			216,162			1,721			4,100			5,821			221,983
	Covered loans			9,061			39			296			335			9,396
	Total loans		$	225,223		$	1,760		$	4,396		$	6,156		$	231,379
	Total outstanding commitments		$	460,484		$	3,124		$	5,055		$	8,179		$	468,663
	December 31, 2012
	Commercial		$	63,906		$	1,114		$	1,203		$	2,317		$	66,223
	Commercial real estate			34,096			621			2,236			2,857			36,953
	Residential mortgages (b)			42,897			18			1,103			1,121			44,018
	Credit card			16,752			–			363			363			17,115
	Other retail			47,294			36			382			418			47,712
	Total loans, excluding covered loans			204,945			1,789			5,287			7,076			212,021
	Covered loans			10,786			61			461			522			11,308
	Total loans		$	215,731		$	1,850		$	5,748		$	7,598		$	223,329
	Total outstanding commitments		$	442,047		$	3,231		$	6,563		$	9,794		$	451,841
	(a)	Classified rating on consumer loans primarily based on delinquency status.
	(b)	At September 30, 2013, $3.5 billion of GNMA loans 90 days or more past due and $1.9 billion of restructured GNMA loans whose repayments are insured by the Federal Housing Administration or guaranteed by the Department of Veterans Affairs were classified with a pass rating, compared with $3.2 billion and $2.4 billion at December 31, 2012, respectively.
Summary of Impaired Loans by Portfolio Class	'
	A summary of impaired loans by portfolio class was as follows:
	(Dollars in Millions)		Period-end			Unpaid			Valuation			Commitments
			Recorded			Principal			Allowance			to Lend
			Investment (a)			Balance						Additional
												Funds
	30-Sep-13
	Commercial		$	375		$	857		$	38		$	25
	Commercial real estate			721			1,570			36			14
	Residential mortgages			2,762			3,404			323			2
	Credit card			335			335			101			–
	Other retail			408			609			86			3
	Total impaired loans, excluding GNMA and covered loans			4,601			6,775			584			44
	Loans purchased from GNMA mortgage pools			1,915			1,915			29			–
	Covered loans			503			1,186			34			7
	Total		$	7,019		$	9,876		$	647		$	51
	31-Dec-12
	Commercial		$	404		$	1,200		$	40		$	39
	Commercial real estate			1,077			2,251			70			4
	Residential mortgages			2,748			3,341			415			–
	Credit card			442			442			153			–
	Other retail			443			486			101			3
	Total impaired loans, excluding GNMA and covered loans			5,114			7,720			779			46
	Loans purchased from GNMA mortgage pools			1,778			1,778			39			–
	Covered loans			767			1,584			20			12
	Total		$	7,659		$	11,082		$	838		$	58
	(a)	Substantially all loans classified as impaired at September 30, 2013 and December 31, 2012, had an associated allowance for credit losses.
Impaired Loans Average Recorded Investment and Interest Income	'
	Additional information on impaired loans follows:
			2013						2012
	(Dollars in Millions)		Average			Interest			Average			Interest
			Recorded			Income			Recorded			Income
			Investment			Recognized			Investment			Recognized
	Three Months Ended September 30
	Commercial		$	380		$	5		$	413		$	6
	Commercial real estate			819			6			1,250			12
	Residential mortgages			2,765			32			2,752			31
	Credit card			347			3			495			6
	Other retail			417			7			354			3
	Total impaired loans, excluding GNMA and covered loans			4,728			53			5,264			58
	Loans purchased from GNMA mortgage pools			1,883			22			1,492			20
	Covered loans			519			6			883			7
	Total		$	7,130		$	81		$	7,639		$	85
	Nine Months Ended September 30
	Commercial		$	384		$	24		$	496		$	11
	Commercial real estate			950			27			1,371			29
	Residential mortgages			2,744			99			2,692			87
	Credit card			380			12			529			22
	Other retail			431			19			259			7
	Total impaired loans, excluding GNMA and covered loans			4,889			181			5,347			156
	Loans purchased from GNMA mortgage pools			1,869			68			1,363			51
	Covered loans			588			21			1,042			20
	Total		$	7,346		$	270		$	7,752		$	227
Loans Modified as TDRs	'
	The following table provides a summary of loans modified as TDRs by portfolio class:
			2013									2012
	(Dollars in Millions)		Number			Pre-Modification			Post-Modification			Number			Pre-Modification			Post-Modification
			of Loans			Outstanding			Outstanding			of Loans			Outstanding			Outstanding
						Loan			Loan						Loan			Loan
						Balance			Balance						Balance			Balance
	Three Months Ended September 30
	Commercial			551		$	62		$	60			1,754		$	54		$	58
	Commercial real estate			48			76			73			63			91			80
	Residential mortgages			338			42			42			2,717			344			336
	Credit card			6,447			39			38			14,137			52			67
	Other retail			847			21			21			6,231			159			156
	Total loans, excluding GNMA and covered loans			8,231			240			234			24,902			700			697
	Loans purchased from GNMA mortgage pools			2,315			300			284			4,859			660			589
	Covered loans			38			19			11			73			49			46
	Total loans			10,584		$	559		$	529			29,834		$	1,409		$	1,332
	Nine Months Ended September 30
	Commercial			1,962		$	150		$	140			4,081		$	215		$	195
	Commercial real estate			147			193			186			245			416			390
	Residential mortgages			1,575			214			210			3,788			529			517
	Credit card			20,147			122			122			39,040			189			203
	Other retail			3,519			86			85			8,028			194			191
	Total loans, excluding GNMA and covered loans			27,350			765			743			55,182			1,543			1,496
	Loans purchased from GNMA mortgage pools			6,450			822			782			8,436			1,116			1,087
	Covered loans			109			85			64			166			246			234
	Total loans			33,909		$	1,672		$	1,589			63,784		$	2,905		$	2,817
Schedule of Loans Modified as TDRs that have Subsequently been Fully or Partially Charged-Off or Became 90 Days or More Past Due	'
	The following table provides a summary of TDR loans that defaulted (fully or partially charged-off or became 90 days or more past due) during the periods presented that were modified as TDRs within 12 months previous to default:
			2013						2012
	(Dollars in Millions)		Number			Amount			Number			Amount
			of Loans			Defaulted			of Loans			Defaulted
	Three Months Ended September 30
	Commercial			143		$	37			195		$	2
	Commercial real estate			30			18			13			12
	Residential mortgages			303			41			116			30
	Credit card			1,485			8			2,536			14
	Other retail			278			10			189			4
	Total loans, excluding GNMA and covered loans			2,239			114			3,049			62
	Loans purchased from GNMA mortgage pools			492			69			248			34
	Covered loans			24			25			8			3
	Total loans			2,755		$	208			3,305		$	99
	Nine Months Ended September 30
	Commercial			483		$	42			652		$	33
	Commercial real estate			72			90			96			176
	Residential mortgages			673			100			427			64
	Credit card			5,109			29			7,452			42
	Other retail			1,164			53			531			8
	Total loans, excluding GNMA and covered loans			7,501			314			9,158			323
	Loans purchased from GNMA mortgage pools			4,795			615			731			106
	Covered loans			49			37			49			90
	Total loans			12,345		$	966			9,938		$	519
Carrying Amount of Covered Assets	'
	The carrying amount of the covered assets consisted of purchased impaired loans, purchased nonimpaired loans and other assets as shown in the following table:
			30-Sep-13												31-Dec-12
	(Dollars in Millions)		Purchased			Purchased			Other			Total			Purchased			Purchased			Other			Total
			Impaired			Nonimpaired			Assets						Impaired			Nonimpaired			Assets
			Loans			Loans									Loans			Loans
	Commercial loans		$	–		$	109		$	–		$	109		$	–		$	143		$	–		$	143
	Commercial real estate loans			973			1,803			–			2,776			1,323			2,695			–			4,018
	Residential mortgage loans			3,103			935			–			4,038			3,978			1,109			–			5,087
	Credit card loans			–			5			–			5			–			5			–			5
	Other retail loans			–			683			–			683			–			775			–			775
	Losses reimbursable by the FDIC (a)			–			–			820			820			–			–			1,280			1,280
	Unamortized changes in FDIC asset (b)			–			–			965			965			–			–			–			–
	Covered loans			4,076			3,535			1,785			9,396			5,301			4,727			1,280			11,308
	Foreclosed real estate			–			–			176			176			–			–			197			197
	Total covered assets		$	4,076		$	3,535		$	1,961		$	9,572		$	5,301		$	4,727		$	1,477		$	11,505
	(a)	Relates to loss sharing agreements with remaining terms up to six years.
	(b)	Represents decreases in expected reimbursements by the FDIC as a result of decreases in expected losses on the covered loans. These amounts are amortized as a reduction in interest income on covered loans over the shorter of the expected life of the respective covered loans or the remaining contractual term of the indemnification agreements. These amounts were presented within the separate loan categories prior to January 1, 2013.

Mortgage_Servicing_Rights_Tabl

Mortgage Servicing Rights (Tables)	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Changes in Fair Value of Capitalized MSRs	'
	Changes in fair value of capitalized MSRs are summarized as follows:
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
	(Dollars in Millions)		2013			2012			2013			2012
	Balance at beginning of period		$	2,377		$	1,594		$	1,700		$	1,519
	Rights purchased			2			10			7			39
	Rights capitalized			187			224			674			700
	Changes in fair value of MSRs
	Due to fluctuations in market interest rates (a)			71			(123	)		503			(298	)
	Due to revised assumptions or models (b)			42			(2	)		33			(19	)
	Other changes in fair value (c)			(102	)		(150	)		(340	)		(388	)
	Balance at end of period		$	2,577		$	1,553		$	2,577		$	1,553
	(a)	Includes changes in MSR value associated with changes in market interest rates, including estimated prepayment rates and anticipated earnings on escrow deposits.
	(b)	Includes changes in MSR value not caused by changes in market interest rates, such as changes in cost to service, ancillary income, and discount rate, as well as the impact of any model changes.
	(c)	Primarily represents changes due to realization of expected cash flows over time (decay).
Sensitivity to Changes in Interest Rates to Fair Value of MSR's Portfolio and Related Derivative Instruments	'
	The estimated sensitivity to changes in interest rates of the fair value of the MSRs portfolio and the related derivative instruments was as follows:
			September 30, 2013																		December 31, 2012
	(Dollars in Millions)		Down			Down			Down			Up			Up			Up			Down			Down			Down			Up			Up			Up
			100 bps			50 bps			25 bps			25 bps			50 bps			100 bps			100 bps			50 bps			25 bps			25 bps			50 bps			100 bps
	MSR portfolio		$	(494	)	$	(223	)	$	(107	)	$	92		$	173		$	324		$	(370	)	$	(217	)	$	(118	)	$	126		$	249		$	480
	Derivative instrument hedges			427			211			102			(93	)		(174	)		(317	)		473			249			124			(121	)		(243	)		(486	)
	Net sensitivity		$	(67	)	$	(12	)	$	(5	)	$	(1	)	$	(1	)	$	7		$	103		$	32		$	6		$	5		$	6		$	(6	)
MSRs and Related Characteristics by Portfolio	'
	A summary of the Company’s MSRs and related characteristics by portfolio was as follows:
			September 30, 2013												December 31, 2012
	(Dollars in Millions)		MRBP			Government			Conventional (b)			Total			MRBP			Government			Conventional (b)			Total
	Servicing portfolio		$	15,088		$	41,192		$	170,447		$	226,727		$	14,143		$	39,048		$	162,446		$	215,637
	Fair value		$	171		$	474		$	1,932		$	2,577		$	154		$	314		$	1,232		$	1,700
	Value (bps) (a)			113			115			113			114			109			80			76			79
	Weighted-average servicing fees (bps)			39			32			29			30			40			33			30			31
	Multiple (value/servicing fees)			2.9			3.59			3.9			3.8			2.73			2.42			2.53			2.55
	Weighted-average note rate			4.76	%		4.26	%		4.19	%		4.24	%		5.13	%		4.57	%		4.48	%		4.54	%
	Weighted-average age (in years)			4			2.5			2.4			2.5			4.2			2.4			2.5			2.6
	Weighted-average expected prepayment (constant prepayment rate)			13.1	%		12.6	%		12.2	%		12.3	%		13.2	%		21.2	%		20.4	%		20.1	%
	Weighted-average expected life (in years)			6.3			6.5			6.8			6.7			6.1			4.2			4.1			4.2
	Weighted-average discount rate			12	%		11.2	%		9.8	%		10.2	%		12.1	%		11.4	%		10	%		10.4	%
	(a)	Value is calculated as fair value divided by the servicing portfolio.
	(b)	Represents loans sold primarily to GSEs.

Preferred_Stock_Tables

Preferred Stock (Tables)	9 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
Number of Shares Issued and Outstanding and Carrying Amount of Preferred Stock	'
	The number of shares issued and outstanding and the carrying amount of each outstanding series of the Company’s preferred stock was as follows:
			September 30, 2013								December 31, 2012
	(Dollars in Millions)		Shares		Liquidation		Discount		Carrying		Shares		Liquidation		Discount		Carrying
			Issued and		Preference				Amount		Issued and		Preference				Amount
			Outstanding								Outstanding
	Series A			12,510	$	1,251	$	145	$	1,106		12,510	$	1,251	$	145	$	1,106
	Series B			40,000		1,000		–		1,000		40,000		1,000		–		1,000
	Series D			–		–		–		–		20,000		500		–		500
	Series F			44,000		1,100		12		1,088		44,000		1,100		12		1,088
	Series G			43,400		1,085		10		1,075		43,400		1,085		10		1,075
	Series H			20,000		500		13		487		–		–		–		–
	Total preferred stock (a)			159,910	$	4,936	$	180	$	4,756		159,910	$	4,936	$	167	$	4,769
	(a)	The par value of all shares issued and outstanding at September 30, 2013 and December 31, 2012, was $1.00 per share.

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
Reconciliation of Transactions Affecting Accumulated Other Comprehensive Income (Loss)	'
	The reconciliation of the transactions affecting accumulated other comprehensive income (loss) included in shareholders’ equity is as follows:
	Three Months Ended September 30	Unrealized Gains			Unrealized Gains			Unrealized Gains			Unrealized Gains			Foreign			Total
	(Dollars in Millions)	(Losses) on			(Losses) on			(Losses) on			(Losses) on			Currency
		Securities			Securities			Derivative Hedges			Retirement Plans			Translation
		Available-For-Sale			Transferred From
					Available-For-
					Sale to Held-To-
					Maturity
	2013
	Balance at beginning of period	$	185		$	84		$	(313	)	$	(1,184	)	$	(60	)	$	(1,288	)
	Changes in unrealized gains and losses		(237	)		–			(17	)		38			–			(216	)
	Other-than-temporary impairment not recognized in earnings on securities available-for-sale		1			–			–			–			–			1
	Foreign currency translation adjustment		–			–			–			–			13			13
	Reclassification to earnings of realized gains and losses		3			(13	)		47			62			–			99
	Applicable income taxes		89			5			(11	)		(38	)		(5	)		40
	Balance at end of period	$	41		$	76		$	(294	)	$	(1,122	)	$	(52	)	$	(1,351	)
	2012
	Balance at beginning of period	$	504		$	134		$	(447	)	$	(977	)	$	(44	)	$	(830	)
	Changes in unrealized gains and losses		300			–			(30	)		–			–			270
	Other-than-temporary impairment not recognized in earnings on securities available-for-sale		2			–			–			–			–			2
	Foreign currency translation adjustment		–			–			–			–			26			26
	Reclassification to earnings of realized gains and losses		(1	)		(21	)		53			38			–			69
	Applicable income taxes		(115	)		8			(9	)		(14	)		(10	)		(140	)
	Balance at end of period	$	690		$	121		$	(433	)	$	(953	)	$	(28	)	$	(603	)
	Nine Months Ended September 30	Unrealized Gains			Unrealized Gains			Unrealized Gains			Unrealized Gains			Foreign			Total
	(Dollars in Millions)	(Losses) on			(Losses) on			(Losses) on			(Losses) on			Currency
		Securities			Securities			Derivative Hedges			Retirement Plans			Translation
		Available-For-Sale			Transferred From
					Available-For-
					Sale to Held-To-
					Maturity
	2013
	Balance at beginning of period	$	679		$	107		$	(404	)	$	(1,265	)	$	(40	)	$	(923	)
	Changes in unrealized gains and losses		(1,032	)		–			33			37			–			(962	)
	Other-than-temporary impairment not recognized in earnings on securities available-for-sale		8			–			–			–			–			8
	Foreign currency translation adjustment		–			–			–			–			(20	)		(20	)
	Reclassification to earnings of realized gains and losses		(8	)		(50	)		142			186			–			270
	Applicable income taxes		394			19			(65	)		(80	)		8			276
	Balance at end of period	$	41		$	76		$	(294	)	$	(1,122	)	$	(52	)	$	(1,351	)
	2012
	Balance at beginning of period	$	360		$	–		$	(489	)	$	(1,022	)	$	(49	)	$	(1,200	)
	Changes in unrealized gains and losses		738			–			(68	)		–			–			670
	Other-than-temporary impairment not recognized in earnings on securities available-for-sale		3			–			–			–			–			3
	Transfer of securities from available-for-sale to held-to-maturity		(224	)		224			–			–			–			–
	Foreign currency translation adjustment		–			–			–			–			34			34
	Reclassification to earnings of realized gains and losses		18			(28	)		158			112			–			260
	Applicable income taxes		(205	)		(75	)		(34	)		(43	)		(13	)		(370	)
	Balance at end of period	$	690		$	121		$	(433	)	$	(953	)	$	(28	)	$	(603	)
Impact to Net Income for Items Reclassified out of Accumulated Other Comprehensive Income and into Earnings	'
	Additional detail about the impact to net income for items reclassified out of accumulated other comprehensive income and into earnings for the periods presented, is as follows:
		Impact to Net Income
	(Dollars in Millions)	Three Months Ended			Nine Months Ended			Affected Line Item in the
		September 30, 2013			September 30, 2013			Consolidated Statement of Income
	Unrealized gains (losses) on securities available-for-sale
	Realized gains (losses) on sale of securities	$	–		$	21		Total securities gains (losses), net
	Other-than-temporary impairment recognized in earnings		(3	)		(13	)
			(3	)		8		Total before tax
			1			(3	)	Applicable income taxes
			(2	)		5		Net-of-tax
	Unrealized gains (losses) on securities transferred from available-for-sale to held-to-maturity
	Amortization of unrealized gains		13			50		Interest income
			(5	)		(19	)	Applicable income taxes
			8			31		Net-of-tax
	Unrealized gains (losses) on derivative hedges
	Realized gains (losses) on derivative hedges		(47	)		(142	)	Net interest income
			18			55		Applicable income taxes
			(29	)		(87	)	Net-of-tax
	Unrealized gains (losses) on retirement plans
	Actuarial gains (losses), prior service cost (credit) and transition obligation (asset) amortization		(62	)		(186	)	Employee benefits expense
			24			72		Applicable income taxes
			(38	)		(114	)	Net-of-tax
	Total impact to net income	$	(61	)	$	(165	)

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Components of Earnings Per Share	'
	The components of earnings per share were:
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
	(Dollars and Shares in Millions, Except Per Share Data)		2013			2012			2013			2012
	Net income attributable to U.S. Bancorp		$	1,468		$	1,474		$	4,380		$	4,227
	Preferred dividends			(61	)		(64	)		(189	)		(174	)
	Impact of preferred stock redemption (a)			–			–			(8	)		–
	Earnings allocated to participating stock awards			(7	)		(6	)		(20	)		(19	)
	Net income applicable to U.S. Bancorp common shareholders		$	1,400		$	1,404		$	4,163		$	4,034
	Average common shares outstanding			1,832			1,886			1,844			1,892
	Net effect of the exercise and assumed purchase of stock awards			11			11			10			9
	Average diluted common shares outstanding			1,843			1,897			1,854			1,901
	Earnings per common share		$	0.76		$	0.74		$	2.26		$	2.13
	Diluted earnings per common share		$	0.76		$	0.74		$	2.25		$	2.12
	(a)	Represents stock issuance costs originally recorded in capital surplus upon the issuance of the Company’s Series D Non-Cumulative Perpetual Preferred Stock that were reclassified to retained earnings on the redemption date.

Employee_Benefits_Tables

Employee Benefits (Tables)	9 Months Ended
	Sep. 30, 2013
Compensation And Retirement Disclosure [Abstract]	'
Components of Net Periodic Benefit Cost	'
	The components of net periodic benefit cost for the Company’s retirement plans were:
		Three Months Ended September 30,												Nine Months Ended September 30,
		Pension Plans						Postretirement						Pension Plans						Postretirement
								Welfare Plan												Welfare Plan
	(Dollars in Millions)	2013			2012			2013			2012			2013			2012			2013			2012
	Service cost	$	42		$	33		$	1		$	2		$	126		$	97		$	3		$	4
	Interest cost		43			42			1			1			128			126			3			5
	Expected return on plan assets		(44	)		(48	)		–			(1	)		(132	)		(143	)		(1	)		(2	)
	Prior service cost (credit) and transition obligation (asset) amortization		(1	)		(2	)		–			–			(4	)		(4	)		–			–
	Actuarial loss (gain) amortization		66			41			(3	)		(1	)		198			121			(8	)		(5	)
	Net periodic benefit cost	$	106		$	66		$	(1	)	$	1		$	316		$	197		$	(3	)	$	2

Income_Taxes_Tables

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2013
Income Tax Disclosure [Abstract]	'
Components of Income Tax Expense	'
	The components of income tax expense were:
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
	(Dollars in Millions)		2013			2012			2013			2012
	Federal
	Current		$	390		$	461		$	1,506		$	1,416
	Deferred			57			50			(35	)		26
	Federal income tax			447			511			1,471			1,442
	State
	Current			84			77			161			239
	Deferred			11			5			(3	)		3
	State income tax			95			82			158			242
	Total income tax provision		$	542		$	593		$	1,629		$	1,684
Reconciliation of Expected Income Tax Expense at Federal Statutory Rate of 35 Percent to Company's Applicable Income Tax Expense	'
	A reconciliation of expected income tax expense at the federal statutory rate of 35 percent to the Company’s applicable income tax expense follows:
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
	(Dollars in Millions)		2013			2012			2013			2012
	Tax at statutory rate		$	690		$	709		$	2,061		$	2,030
	State income tax, at statutory rates, net of federal tax benefit			62			53			102			157
	Tax effect of
	Tax credits, net of related expenses (a)			(176	)		(120	)		(394	)		(322	)
	Tax-exempt income			(52	)		(55	)		(159	)		(165	)
	Noncontrolling interests			13			15			42			39
	Other items			5			(9	)		(23	)		(55	)
	Applicable income taxes		$	542		$	593		$	1,629		$	1,684
	(a)	Excludes tax credits of $209 million for the three and nine months ended September 30, 2013 which were recognized as a reduction to the related investment asset.

Derivative_Instruments_Tables

Derivative Instruments (Tables)	9 Months Ended
	Sep. 30, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
Asset and Liability Management Derivative Positions of Company	'
	The following table summarizes the asset and liability management derivative positions of the Company:
			Asset Derivatives									Liability Derivatives
	(Dollars in Millions)		Notional			Fair			Weighted-Average			Notional			Fair			Weighted-Average
			Value			Value			Remaining			Value			Value			Remaining
									Maturity									Maturity
									In Years									In Years
	30-Sep-13
	Fair value hedges
	Interest rate contracts
	Receive fixed/pay floating swaps		$	500		$	21			2.34		$	–		$	–			–
	Cash flow hedges
	Interest rate contracts
	Pay fixed/receive floating swaps			272			17			9.02			4,288			548			2.71
	Receive fixed/pay floating swaps			7,000			31			1.1			–			–			–
	Net investment hedges
	Foreign exchange forward contracts			–			–			–			925			11			0.05
	Other economic hedges
	Interest rate contracts
	Futures and forwards
	Buy			4,418			88			0.09			34			8			0.08
	Sell			41			2			0.2			6,203			122			0.09
	Options
	Purchased			2,325			–			0.07			–			–			–
	Written			1,800			34			0.09			9			–			0.02
	Receive fixed/pay floating swaps			3,220			83			10.23			–			–			–
	Foreign exchange forward contracts			1,980			4			0.02			2,695			6			0.02
	Equity contracts			8			–			1.72			66			–			1.89
	Credit contracts			1,177			4			4.12			2,495			11			4.91
	Total		$	22,741		$	284					$	16,715		$	706
	31-Dec-12
	Fair value hedges
	Interest rate contracts
	Receive fixed/pay floating swaps		$	500		$	30			3.09		$	–		$	–			–
	Cash flow hedges
	Interest rate contracts
	Pay fixed/receive floating swaps			32			–			9.88			4,528			718			3.79
	Receive fixed/pay floating swaps			7,000			45			1.84			–			–			–
	Net investment hedges
	Foreign exchange forward contracts			758			1			0.07			–			–			–
	Other economic hedges
	Interest rate contracts
	Futures and forwards
	Buy			11,164			138			0.07			2,921			13			0.04
	Sell			6,299			18			0.11			12,223			57			0.09
	Options
	Purchased			2,435			–			0.07			–			–			–
	Written			4,991			123			0.12			4			–			0.06
	Receive fixed/pay floating swaps			350			1			10.21			3,775			14			10.21
	Foreign exchange forward contracts			618			4			0.03			1,383			6			0.01
	Equity contracts			31			–			2.8			27			–			2.46
	Credit contracts			1,056			3			4.56			1,947			10			3.11
	Total		$	35,234		$	363					$	26,808		$	818
Customer-Related Derivative Positions of Company	'
	The following table summarizes the customer-related derivative positions of the Company:
			Asset Derivatives									Liability Derivatives
	(Dollars in Millions)		Notional			Fair			Weighted-Average			Notional			Fair			Weighted-Average
			Value			Value			Remaining			Value			Value			Remaining
									Maturity									Maturity
									In Years									In Years
	30-Sep-13
	Interest rate contracts
	Receive fixed/pay floating swaps		$	13,562		$	736			5.3		$	5,138		$	70			4.98
	Pay fixed/receive floating swaps			4,700			76			5.15			14,089			691			5.26
	Options
	Purchased			3,681			28			4.46			107			1			1.12
	Written			107			1			1.12			3,681			28			4.46
	Foreign exchange rate contracts
	Forwards, spots and swaps			10,392			411			0.71			9,688			375			0.68
	Options
	Purchased			367			9			0.64			–			–			–
	Written			–			–			–			367			9			0.64
	Total		$	32,809		$	1,261					$	33,070		$	1,174
	31-Dec-12
	Interest rate contracts
	Receive fixed/pay floating swaps		$	16,671		$	1,085			4.78		$	1,090		$	15			9.3
	Pay fixed/receive floating swaps			928			14			11.12			16,923			1,042			4.74
	Options
	Purchased			3,046			16			5.24			28			–			4.42
	Written			286			–			0.75			2,788			16			5.68
	Foreign exchange rate contracts
	Forwards, spots and swaps			12,186			322			0.43			11,861			286			0.44
	Options
	Purchased			323			6			0.55			–			–			–
	Written			–			–			–			323			6			0.55
	Total		$	33,440		$	1,443					$	33,013		$	1,365
Summary of Effective Portion of Gains (Losses) Recognized in Other Comprehensive Income (Loss) and Gains (Losses) Reclassified from Other Comprehensive Income (Loss) into Earnings	'
	The table below shows the effective portion of the gains (losses) recognized in other comprehensive income (loss) and the gains (losses) reclassified from other comprehensive income (loss) into earnings (net-of-tax):
			Three Months Ended September 30,												Nine Months Ended September 30,
			Gains (Losses)						Gains (Losses)						Gains (Losses)						Gains (Losses)
			Recognized in						Reclassified						Recognized in						Reclassified
			Other						from Other						Other						from Other
			Comprehensive						Comprehensive						Comprehensive						Comprehensive
			Income (Loss)						Income (Loss)						Income (Loss)						Income (Loss)
									into Earnings												into Earnings
	(Dollars in Millions)		2013			2012			2013			2012			2013			2012			2013			2012
	Asset and Liability Management Positions
	Cash flow hedges
	Interest rate contracts (a)		$	(11	)	$	(19	)	$	(30	)	$	(33	)	$	22		$	(42	)	$	(88	)	$	(98	)
	Net investment hedges
	Foreign exchange forward contracts			(29	)		–			–			–			(23	)		(6	)		–			–
	Non-derivative debt instruments			–			(11	)		–			–			–			26			–			–
	Note:	Ineffectiveness on cash flow and net investment hedges was not material for the three and nine months ended September 30, 2013 and 2012.
	(a)	Gains (Losses) reclassified from other comprehensive income (loss) into interest income on loans and interest expense on long-term debt.
Summary of Gains (Losses) Recognized in Earnings for Fair Value Hedges, Other Economic Hedges and Customer-Related Positions	'
	The table below shows the gains (losses) recognized in earnings for fair value hedges, other economic hedges and the customer-related positions:
			Location of Gains (Losses)			Three Months						Nine Months
			Recognized in Earnings			Ended September 30,						Ended September 30,
	(Dollars in Millions)					2013			2012			2013			2012
	Asset and Liability Management Positions
	Fair value hedges (a)
	Interest rate contracts			Other noninterest income		$	–		$	2		$	(7	)	$	5
	Foreign exchange cross-currency swaps			Other noninterest income			–			–			–			42
	Other economic hedges
	Interest rate contracts
	Futures and forwards			Mortgage banking revenue			33			(44	)		569			67
	Purchased and written options			Mortgage banking revenue			54			290			200			689
	Receive fixed/pay floating swaps			Mortgage banking revenue			(5	)		48			(264	)		186
	Foreign exchange forward contracts			Commercial products revenue			(16	)		(25	)		18			(62	)
	Equity contracts			Compensation expense			–			1			1			2
	Credit contracts			Other noninterest income/expense			2			(2	)		1			(8	)
	Customer-Related Positions
	Interest rate contracts
	Receive fixed/pay floating swaps			Other noninterest income			13			(16	)		(288	)		(10	)
	Pay fixed/receive floating swaps			Other noninterest income			(10	)		19			298			15
	Foreign exchange rate contracts
	Forwards, spots and swaps			Commercial products revenue			15			13			36			36
	(a)	Gains (Losses) on items hedged by interest rate contracts and foreign exchange forward contracts, included in noninterest income (expense), were both zero for the three months ended September 30, 2013, and $(2) million and zero for the three months ended September 30, 2012, respectively. Gains (Losses) on items hedged by interest rate contracts and foreign exchange forward contracts, included in noninterest income (expense), were $7 million and zero for the nine months ended September 30, 2013, respectively, and $(5) million and $(44) million for the nine months ended September 30, 2012, respectively. The ineffective portion was immaterial for the three and nine months ended September 30, 2013 and 2012.

Netting_Arrangements_for_Certa1

Netting Arrangements for Certain Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Information on Company's Accounting Netting Adjustments and Items Not Offset in Consolidated Balance Sheet But Available for Offset in Event of Default	'
	The following tables provide information on the Company’s netting adjustments, and items not offset on the Consolidated Balance Sheet but available for offset in the event of default:
			Gross		Gross Amounts			Net Amounts		Gross Amounts Not Offset on						Net
			Recognized		Offset on the			Presented on the		the Consolidated Balance Sheet						Amount
			Assets		Consolidated			Consolidated
	(Dollars in Millions)				Balance Sheet (a)			Balance Sheet		Financial			Collateral
										Instruments (b)			Received (c)
	30-Sep-13
	Derivative assets (d)		$	1,362	$	(572	)	$	790	$	(32	)	$	–		$	758
	Reverse repurchase agreements			150		–			150		(35	)		(115	)		–
	Securities borrowed			527		–			527		(1	)		(510	)		16
	Total		$	2,039	$	(572	)	$	1,467	$	(68	)	$	(625	)	$	774
	31-Dec-12
	Derivative assets (d)		$	1,546	$	(418	)	$	1,128	$	(148	)	$	–		$	980
	Reverse repurchase agreements			363		–			363		(44	)		(319	)		–
	Securities borrowed			368		–			368		–			(356	)		12
	Total		$	2,277	$	(418	)	$	1,859	$	(192	)	$	(675	)	$	992
	(a)	Includes $75 million and $79 million of cash collateral related payables that were netted against derivative assets at September 30, 2013 and December 31, 2012, respectively.
	(b)	For derivative assets this includes any derivative liability fair values that could be offset in the event of counterparty default; for reverse repurchase agreements this includes any repurchase agreement payables that could be offset in the event of counterparty default; for securities borrowed this includes any securities loaned payables that could be offset in the event of counterparty default.
	(c)	Includes the fair value of securities received by the Company from the counterparty. These securities are not included on the Consolidated Balance Sheet unless the counterparty defaults.
	(d)	Excludes $183 million and $260 million of derivative assets centrally cleared or otherwise not subject to netting arrangements at September 30, 2013 and December 31, 2012, respectively.
			Gross		Gross Amounts			Net Amounts		Gross Amounts Not Offset on						Net
			Recognized		Offset on the			Presented on the		the Consolidated Balance Sheet						Amount
			Liabilities		Consolidated			Consolidated
	(Dollars in Millions)				Balance Sheet (a)			Balance Sheet		Financial			Collateral
										Instruments (b)			Pledged (c)
	30-Sep-13
	Derivative liabilities (d)		$	1,825	$	(1,358	)	$	467	$	(32	)	$	–		$	435
	Repurchase agreements			1,940		–			1,940		(35	)		(1,905	)		–
	Securities loaned			134		–			134		(1	)		(132	)		1
	Total		$	3,899	$	(1,358	)	$	2,541	$	(68	)	$	(2,037	)	$	436
	31-Dec-12
	Derivative liabilities (d)		$	2,178	$	(1,549	)	$	629	$	(148	)	$	–		$	481
	Repurchase agreements			3,389		–			3,389		(44	)		(3,345	)		–
	Securities loaned			–		–			–		–			–			–
	Total		$	5,567	$	(1,549	)	$	4,018	$	(192	)	$	(3,345	)	$	481
	(a)	Includes $862 million and $1.2 billion of cash collateral related receivables that were netted against derivative liabilities at September 30, 2013 and December 31, 2012, respectively.
	(b)	For derivative liabilities this includes any derivative asset fair values that could be offset in the event of counterparty default; for repurchase agreements this includes any reverse repurchase agreement receivables that could be offset in the event of counterparty default; for securities loaned this includes any securities borrowed receivables that could be offset in the event of counterparty default.
	(c)	Includes the fair value of securities pledged by the Company to the counterparty. These securities are included on the Consolidated Balance Sheet unless the Company defaults.
	(d)	Excludes $55 million and $5 million of derivative liabilities centrally cleared or otherwise not subject to netting arrangements at September 30, 2013 and December 31, 2012, respectively.

Fair_Values_of_Assets_and_Liab1

Fair Values of Assets and Liabilities (Tables)	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Valuation Assumption Ranges for Level 3 Available-for-Sale Investment Securities	'
	The following table shows the significant valuation assumption ranges for Level 3 available-for-sale investment securities at September 30, 2013:
			Minimum			Maximum			Average
	Residential Prime Non-Agency Mortgage-Backed Securities (a)
	Estimated lifetime prepayment rates			6	%		20	%		13	%
	Lifetime probability of default rates			–			7			4
	Lifetime loss severity rates			25			65			43
	Discount margin			2			6			4
	Residential Non-Prime Non-Agency Mortgage-Backed Securities (b)
	Estimated lifetime prepayment rates			2	%		10	%		6	%
	Lifetime probability of default rates			4			11			7
	Lifetime loss severity rates			15			70			54
	Discount margin			1			6			3
	Other Asset-Backed Securities
	Estimated lifetime prepayment rates			6	%		6	%		6	%
	Lifetime probability of default rates			4			4			4
	Lifetime loss severity rates			40			40			40
	Discount margin			8			8			8
	(a)	Prime securities are those designated as such by the issuer at origination. When an issuer designation is unavailable, the Company determines at acquisition date the categorization based on asset pool characteristics (such as weighted-average credit score, loan-to-value, loan type, prevalence of low documentation loans) and deal performance (such as pool delinquencies and security market spreads).
	(b)	Includes all securities not meeting the conditions to be designated as prime.
Valuation Assumption Ranges for MSRs	'
	The following table shows the significant valuation assumption ranges for MSRs at September 30, 2013:
			Minimum			Maximum			Average
	Expected prepayment			10	%		22	%		12	%
	Discount rate			10			13			10
Valuation Assumption Ranges for Derivative Commitments	'
	The following table shows the significant valuation assumption ranges for the Company’s derivative commitments to sell, purchase and originate mortgage loans at September 30, 2013:
			Minimum			Maximum			Average
	Expected loan close rate			32	%		100	%		76	%
	Inherent MSR value (basis points per loan)			46			219			108
Balances of Assets and Liabilities Measured at Fair Value on Recurring Basis	'
	The following table summarizes the balances of assets and liabilities measured at fair value on a recurring basis:
	(Dollars in Millions)		Level 1			Level 2			Level 3			Netting			Total
	30-Sep-13
	Available-for-sale securities
	U.S. Treasury and agencies		$	463		$	1,058		$	–		$	–		$	1,521
	Mortgage-backed securities
	Residential
	Agency			–			29,220			–			–			29,220
	Non-agency
	Prime (a)			–			–			500			–			500
	Non-prime (b)			–			–			303			–			303
	Commercial
	Agency			–			169			–			–			169
	Asset-backed securities
	Collateralized debt obligations/Collateralized loan obligations			–			25			–			–			25
	Other			–			570			40			–			610
	Obligations of state and political subdivisions			–			5,820			–			–			5,820
	Obligations of foreign governments			–			6			–			–			6
	Corporate debt securities			–			633			9			–			642
	Perpetual preferred securities			–			209			–			–			209
	Other investments			265			17			–			–			282
	Total available-for-sale			728			37,727			852			–			39,307
	Mortgage loans held for sale			–			3,844			–			–			3,844
	Mortgage servicing rights			–			–			2,577			–			2,577
	Derivative assets			–			875			670			(572	)		973
	Other assets			85			922			–			–			1,007
	Total		$	813		$	43,368		$	4,099		$	(572	)	$	47,708
	Derivative liabilities		$	–		$	1,827		$	53		$	(1,358	)	$	522
	Short-term borrowings (c)			231			533			–			–			764
	Total		$	231		$	2,360		$	53		$	(1,358	)	$	1,286
	31-Dec-12
	Available-for-sale securities
	U.S. Treasury and agencies		$	491		$	735		$	–		$	–		$	1,226
	Mortgage-backed securities
	Residential
	Agency			–			29,495			–			–			29,495
	Non-agency
	Prime (a)			–			–			624			–			624
	Non-prime (b)			–			–			355			–			355
	Commercial
	Agency			–			193			–			–			193
	Asset-backed securities
	Collateralized debt obligations/Collateralized loan obligations			–			42			–			–			42
	Other			–			577			15			–			592
	Obligations of state and political subdivisions			–			6,455			–			–			6,455
	Obligations of foreign governments			–			6			–			–			6
	Corporate debt securities			–			722			9			–			731
	Perpetual preferred securities			–			218			–			–			218
	Other investments			187			15			–			–			202
	Total available-for-sale			678			38,458			1,003			–			40,139
	Mortgage loans held for sale			–			7,957			–			–			7,957
	Mortgage servicing rights			–			–			1,700			–			1,700
	Derivative assets			–			572			1,234			(418	)		1,388
	Other assets			94			386			–			–			480
	Total		$	772		$	47,373		$	3,937		$	(418	)	$	51,664
	Derivative liabilities		$	–		$	2,128		$	55		$	(1,549	)	$	634
	Short-term borrowings (c)			50			351			–			–			401
	Total		$	50		$	2,479		$	55		$	(1,549	)	$	1,035
	(a)	Prime securities are those designated as such by the issuer at origination. When an issuer designation is unavailable, the Company determines at acquisition date the categorization based on asset pool characteristics (such as weighted-average credit score, loan-to-value, loan type, prevalence of low documentation loans) and deal performance (such as pool delinquencies and security market spreads).
	(b)	Includes all securities not meeting the conditions to be designated as prime.
	(c)	Represents the Company’s obligation on securities sold short required to be accounted for at fair value per applicable accounting guidance.
Changes in Fair Value for All Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)	'
	The following table presents the changes in fair value for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three months ended September 30:
	(Dollars in Millions)		Beginning			Net Gains			Net Gains			Purchases			Sales			Principal			Issuances			Settlements			End		Net Change in
			of Period			(Losses)			(Losses)									Payments									of		Unrealized Gains
			Balance			Included in			Included in																		Period		(Losses) Relating
						Net Income			Other																		Balance		to Assets
									Comprehensive																				Still Held at
									Income (Loss)																				End of Period
	2013
	Available-for-sale securities
	Mortgage-backed securities
	Residential non-agency
	Prime (a)		$	547		$	(2	)	$	(4	)	$	–		$	–		$	(41	)	$	–		$	–		$	500	$	(4	)
	Non-prime (b)			319			(3	)		(4	)		–			–			(9	)		–			–			303		(4	)
	Asset-backed securities
	Other			40			1			(2	)		3			–			(2	)		–			–			40		(2	)
	Corporate debt securities			9			–			–			–			–			–			–			–			9		–
	Total available-for-sale			915			(4	)(c)		(10	)(f)		3			–			(52	)		–			–			852		(10	)
	Mortgage servicing rights			2,377			11	(d)		–			2			–			–			187	(g)		–			2,577		11	(d)
	Net derivative assets and liabilities			423			182	(e)		–			–			(2	)		–			–			14			617		62	(h)
	2012
	Available-for-sale securities
	Mortgage-backed securities
	Residential non-agency
	Prime (a)		$	713		$	(4	)	$	23		$	–		$	(61	)	$	(40	)	$	–		$	–		$	631	$	26
	Non-prime (b)			796			(8	)		132			–			(562	)		(18	)		–			–			340		23
	Commercial non-agency			37			–			2			–			(39	)		–			–			–			–		–
	Asset-backed securities
	Collateralized debt obligations/Collateralized loan obligations			102			2			(7	)		–			(96	)		(1	)		–			–			–		–
	Other			112			1			(4	)		3			(93	)		(3	)		–			–			16		2
	Corporate debt securities			9			–			–			–			–			–			–			–			9		–
	Total available-for-sale			1,769			(9	)(i)		146	(f)		3			(851	)		(62	)		–			–			996		51
	Mortgage servicing rights			1,594			(275	)(d)		–			10			–			–			224	(g)		–			1,553		(275	)(d)
	Net derivative assets and liabilities			1,360			843	(j)		–			1			(1	)		–			–			(713	)		1,490		(557	)(k)
	(a)	Prime securities are those designated as such by the issuer at origination. When an issuer designation is unavailable, the Company determines at acquisition date the categorization based on asset pool characteristics (such as weighted-average credit score, loan-to-value, loan type, prevalence of low documentation loans) and deal performance (such as pool delinquencies and security market spreads).
	(b)	Includes all securities not meeting the conditions to be designated as prime.
	(c)	Approximately $(3) million included in securities gains (losses) and $(1) million included in interest income.
	(d)	Included in mortgage banking revenue.
	(e)	Approximately $89 million included in other noninterest income and $93 million included in mortgage banking revenue.
	(f)	Included in changes in unrealized gains and losses on securities available-for-sale.
	(g)	Represents MSRs capitalized during the period.
	(h)	Approximately $(28) million included in other noninterest income and $90 million included in mortgage banking revenue.
	(i)	Approximately $(15) million included in securities gains (losses) and $6 million included in interest income.
	(j)	Approximately $124 million included in other noninterest income and $719 million included in mortgage banking revenue.
	(k)	Approximately $7 million included in other noninterest income and $(564) million included in mortgage banking revenue.
	The following table presents the changes in fair value for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the nine months ended September 30:
	(Dollars in Millions)		Beginning			Net Gains			Net Gains			Purchases			Sales			Principal			Issuances			Settlements			End		Net Change in
			of Period			(Losses)			(Losses)									Payments									of		Unrealized Gains
			Balance			Included in			Included in																		Period		(Losses) Relating
						Net Income			Other																		Balance		to Assets
									Comprehensive																				Still Held at
									Income (Loss)																				End of Period
	2013
	Available-for-sale securities
	Mortgage-backed securities
	Residential non-agency
	Prime (a)		$	624		$	(6	)	$	4		$	–		$	–		$	(122	)	$	–		$	–		$	500	$	4
	Non-prime (b)			355			(11	)		13			–			(20	)		(34	)		–			–			303		14
	Asset-backed securities
	Other			15			2			(1	)		28			–			(4	)		–			–			40		(1	)
	Corporate debt securities			9			–			–			–			–			–			–			–			9		–
	Total available-for-sale			1,003			(15	)(c)		16	(f)		28			(20	)		(160	)		–			–			852		17
	Mortgage servicing rights			1,700			196	(d)		–			7			–			–			674	(g)		–			2,577		196	(d)
	Net derivative assets and liabilities			1,179			(34	)(e)		–			1			(4	)		–			–			(525	)		617		(565	)(h)
2012
Available-for-sale securities
Mortgage-backed securities
Residential non-agency
Prime (a)		$	803		$	(5	)	$	60		$	–		$	(109	)	$	(118	)	$	–		$	–		$	631	$	58
Non-prime (b)			802			(18	)		197			–			(562	)		(79	)		–			–			340		52
Commercial non-agency			42			1			–			–			(39	)		(4	)		–			–			–		–
Asset-backed securities
Collateralized debt obligations/Collateralized loan obligations			120			12			(8	)		–			(103	)		(21	)		–			–			–		–
Other			117			7			–			3			(93	)		(18	)		–			–			16		2
Corporate debt securities			9			–			–			–			–			–			–			–			9		–
Total available-for-sale			1,893			(3	)(i)		249	(f)		3			(906	)		(240	)		–			–			996		112
Mortgage servicing rights			1,519			(705	)(d)		–			39			–			–			700	(g)		–			1,553		(705	)(d)
Net derivative assets and liabilities			1,228			2,050	(j)		–			1			(3	)		–			–			(1,786	)		1,490		(1,407	)(k)
(a)	Prime securities are those designated as such by the issuer at origination. When an issuer designation is unavailable, the Company determines at acquisition date the categorization based on asset pool characteristics (such as weighted-average credit score, loan-to-value, loan type, prevalence of low documentation loans) and deal performance (such as pool delinquencies and security market spreads).
(b)	Includes all securities not meeting the conditions to be designated as prime.
(c)	Approximately $(13) million included in securities gains (losses) and $(2) million included in interest income.
(d)	Included in mortgage banking revenue.
(e)	Approximately $(122) million included in other noninterest income and $88 million included in mortgage banking revenue.
(f)	Included in changes in unrealized gains and losses on securities available-for-sale.
(g)	Represents MSRs capitalized during the period.
(h)	Approximately $(301)million included in other noninterest income and $(264) million included in mortgage banking revenue.
(i)	Approximately $(37) million included in securities gains (losses) and $34 million included in interest income.
(j)	Approximately $344 million included in other noninterest income and $1.7 billion included in mortgage banking revenue.
(k)	Approximately $6 million included in other noninterest income and $1.4 billion included in mortgage banking revenue.
Adjusted Carrying Values for Assets Measured at Fair Value on Nonrecurring Basis	'
	The following table summarizes the balances of assets measured at fair value on a nonrecurring basis:
			30-Sep-13												31-Dec-12
	(Dollars in Millions)		Level 1			Level 2			Level 3			Total			Level 1			Level 2			Level 3			Total
	Loans (a)		$	–		$	–		$	94		$	94		$	–		$	–		$	140		$	140
	Other assets (b)			–			–			144			144			–			–			194			194
	(a)	Represents the carrying value of loans for which adjustments were based on the fair value of the collateral, excluding loans fully charged-off.
	(b)	Primarily represents the fair value of foreclosed properties that were measured at fair value based on an appraisal or broker price opinion of the collateral subsequent to their initial acquisition.
Losses Recognized Related to Nonrecurring Fair Value Measurements of Individual Assets or Portfolios	'
	The following table summarizes losses recognized related to nonrecurring fair value measurements of individual assets or portfolios:
			Three Months						Nine Months
			Ended September 30,						Ended September 30,
	(Dollars in Millions)		2013			2012			2013			2012
	Loans (a)		$	22		$	12		$	55		$	51
	Other assets (b)			14			42			73			129
	(a)	Represents write-downs of loans which were based on the fair value of the collateral, excluding loans fully charged-off.
	(b)	Primarily represents related losses of foreclosed properties that were measured at fair value subsequent to their initial acquisition.
Differences Between Aggregate Fair Value, Carrying Amount of MLHFS and Aggregate Unpaid Principal Amount	'
	The following table summarizes the differences between the aggregate fair value carrying amount of MLHFS for which the fair value option has been elected and the aggregate unpaid principal amount that the Company is contractually obligated to receive at maturity:
			30-Sep-13									31-Dec-12
	(Dollars in Millions)		Fair Value			Aggregate			Carrying			Fair Value			Aggregate			Carrying
			Carrying			Unpaid			Amount Over			Carrying			Unpaid			Amount Over
			Amount			Principal			(Under) Unpaid			Amount			Principal			(Under) Unpaid
									Principal									Principal
	Total loans		$	3,844		$	3,693		$	151		$	7,957		$	7,588		$	369
	Nonaccrual loans			10			15			(5	)		8			13			(5	)
	Loans 90 days or more past due			1			1			–			2			3			(1	)
Estimated Fair Values of Financial Instruments	'
	The estimated fair values of the Company’s financial instruments are shown in the table below:
			30-Sep-13															31-Dec-12
			Carrying			Fair Value												Carrying			Fair Value
	(Dollars in Millions)		Amount			Level 1			Level 2			Level 3			Total			Amount			Level 1			Level 2			Level 3		Total
	Financial Assets
	Cash and due from banks		$	11,615		$	11,615		$	–		$	–		$	11,615		$	8,252		$	8,252		$	–		$	–	$	8,252
	Federal funds sold and securities purchased under resale agreements			259			–			259			–			259			437			–			437			–		437
	Investment securities			36,904			2,912			33,611			109			36,632			34,389			2,984			31,845			123		34,952
	held-to-maturity
	Loans held for sale (a)			14			–			–			14			14			19			–			–			19		19
	Loans (b)			227,027			–			–			228,087			228,087			218,765			–			–			220,354		220,354
	Other financial instruments			2,149			–			1,166			1,000			2,166			7,367			–			1,228			6,157		7,385
	Financial Liabilities
	Deposits			261,716			–			261,792			–			261,792			249,183			–			249,594			–		249,594
	Short-term borrowings (c)			25,364			–			25,307			–			25,307			25,901			–			25,917			–		25,917
	Long-term debt			18,750			–			19,216			–			19,216			25,516			–			26,205			–		26,205
	(a)	Excludes mortgages held for sale for which the fair value option under applicable accounting guidance was elected.
	(b)	Excludes loans measured at fair value on a nonrecurring basis.
	(c)	Excludes the Company’s obligation on securities sold short required to be accounted for at fair value per applicable accounting guidance.

Guarantees_and_Contingent_Liab1

Guarantees and Contingent Liabilities (Tables)	9 Months Ended
	Sep. 30, 2013
Commitments And Contingencies Disclosure [Abstract]	'
Summary of Other Guarantees and Contingent Liabilities	'
	The following table is a summary of other guarantees and contingent liabilities of the Company at September 30, 2013:
	(Dollars in Millions)		Collateral			Carrying			Maximum
			Held			Amount			Potential
									Future
									Payments
	Standby letters of credit		$	–		$	71		$	17,339
	Third-party borrowing arrangements			–			–			17
	Securities lending indemnifications			5,494			–			5,326
	Asset sales			–			267			3,250	(a)
	Merchant processing			840			69			86,584
	Contingent consideration arrangements			–			14			17
	Tender option bond program guarantee			4,762			–			4,711
	Minimum revenue guarantees			–			12			12
	Other			–			6			553
	(a)	The maximum potential future payments do not include loan sales where the Company provides standard representation and warranties to the buyer against losses related to loan underwriting documentation defects that may have existed at the time of sale that generally are identified after the occurrence of a triggering event such as delinquency. For these types of loan sales, the maximum potential future payments is generally the unpaid principal balance of loans sold measured at the end of the current reporting period. Actual losses will be significantly less than the maximum exposure, as only a fraction of loans sold will have a representation and warranty breach, and any losses on repurchase would generally be mitigated by any collateral held against the loans.
Company's Representation and Warranty Reserve	'
	The following table is a rollforward of the Company’s representation and warranty reserve:
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
	(Dollars in Millions)		2013			2012			2013			2012
	Balance at beginning of period		$	190		$	216		$	240		$	160
	Net realized losses			(13	)		(32	)		(52	)		(88	)
	Change in reserve			(1	)		36			(12	)		148
	Balance at end of period		$	176		$	220		$	176		$	220

Investment_Securities_Investme

Investment Securities - Investment Securities (Detail) (USD $)	Sep. 30, 2013		Dec. 31, 2012
In Millions, unless otherwise specified
Investment Securities [Line Items]	'		'
Available-for-sale securities, total, amortized cost	$39,240		$39,040
Available-for-sale securities, total, fair value	39,307	[1]	40,139	[1]
Available-for-sale securities, total, weighted average maturity in years	'5 years 6 months		'4 years 1 month 6 days
Available-for-sale securities, total, weighted average yield	2.70%		'
Held-to-maturity securities, Amortized Cost	36,904	[1]	34,389	[1]
Held-to-maturity securities, total, fair value	36,632		34,952
Held-to-maturity securities, total, weighted average maturity in years	'4 years 2 months 12 days		'3 years 3 months 18 days
Held-to-maturity securities, total, weighted average yield	1.97%		'
Total investment securities amortized cost	76,144		73,429
Total investment securities, percentage	100.00%		100.00%
U.S. Treasury and agencies [Member]	'		'
Investment Securities [Line Items]	'		'
Available-for-sale securities, total, amortized cost	1,567		'
Available-for-sale securities, total, fair value	1,521		'
Available-for-sale securities, total, weighted average maturity in years	'5 years 10 months 24 days		'
Available-for-sale securities, total, weighted average yield	1.69%		'
Held-to-maturity securities, total, amortized cost	3,368		'
Held-to-maturity securities, total, fair value	3,317		'
Held-to-maturity securities, total, weighted average maturity in years	'3 years 4 months 24 days		'
Held-to-maturity securities, total, weighted average yield	1.34%		'
Total investment securities amortized cost	4,935		4,365
Total investment securities, percentage	6.50%		5.90%
U.S. Treasury and agencies [Member] | Maturing in one year or less [Member]	'		'
Investment Securities [Line Items]	'		'
Available-for-sale, securities maturing within one year, amortized cost	578		'
Available-for-sale, securities maturing within one year, fair value	578		'
Available-for-sale securities, total, weighted average maturity in years	'2 months 12 days		'
Available-for-sale securities, maturing in one year or less, weighted average yield	0.95%		'
Held-to-maturity securities, maturities within one year, amortized cost	2,112		'
Held-to-maturity securities, maturities within one year, fair value	2,120		'
Held-to-maturity securities, total, weighted average maturity in years	'4 months 24 days		'
Held-to-maturity securities, maturing in one year or less, weighted average yield	0.98%		'
U.S. Treasury and agencies [Member] | Maturing after one year through five years [Member]	'		'
Investment Securities [Line Items]	'		'
Available-for-sale, securities maturing after one through five year, amortized cost	48		'
Available-for-sale, securities maturing after one through five year, fair value	51		'
Available-for-sale securities, total, weighted average maturity in years	'3 years 1 month 6 days		'
Available for sale securities, maturing after one year through five years weighted average yield	3.39%		'
Held-to-maturity securities, maturities after one year through five years, amortized cost	80		'
Held to maturity securities, maturities after one year through five years, fair value	81		'
Held-to-maturity securities, total, weighted average maturity in years	'1 year 8 months 12 days		'
Held-to-maturity securities, maturing after one year through five years, weighted average yield	1.36%		'
U.S. Treasury and agencies [Member] | Maturing after five years through ten years [Member]	'		'
Investment Securities [Line Items]	'		'
Available-for-sale, securities maturing after five through ten year, amortized cost	740		'
Available-for-sale, securities maturing after five through ten year, fair value	703		'
Available-for-sale securities, total, weighted average maturity in years	'8 years 10 months 24 days		'
Available-for-sale securities, maturing after five years through ten years, weighted average yield	2.11%		'
Held-to-maturity securities, maturities after five years through ten years, amortized cost	1,116		'
Held-to-maturity securities, maturities after five year through ten years, fair value	1,056		'
Held-to-maturity securities, total, weighted average maturity in years	'8 years 8 months 12 days		'
Held-to-maturity securities, maturing after five year through ten years, weighted average yield	1.99%		'
U.S. Treasury and agencies [Member] | Maturing after ten years [Member]	'		'
Investment Securities [Line Items]	'		'
Available-for-sale, securities maturing after ten years, amortized cost	201		'
Available-for-sale, securities maturing after ten years, fair value	189		'
Available-for-sale securities, total, weighted average maturity in years	'12 years 1 month 6 days		'
Available-for-sale securities, maturing after ten years, weighted average yield	1.84%		'
Held-to-maturity securities, maturities after ten years, amortized cost	60		'
Held-to-maturity securities, maturities after ten years, fair value	60		'
Held-to-maturity securities, total, weighted average maturity in years	'11 years 4 months 24 days		'
Held-to-maturity securities, maturing after ten years, weighted average yield	1.77%		'
Mortgage-Backed Securities [Member]	'		'
Investment Securities [Line Items]	'		'
Available-for-sale securities, total, amortized cost	30,121		'
Available-for-sale securities, total, fair value	30,192		'
Available-for-sale securities, total, weighted average maturity in years	'5 years 1 month 6 days		'
Available-for-sale securities, total, weighted average yield	2.01%		'
Held-to-maturity securities, total, amortized cost	33,380		'
Held-to-maturity securities, total, fair value	33,160		'
Held-to-maturity securities, total, weighted average maturity in years	'4 years 3 months 18 days		'
Held-to-maturity securities, total, weighted average yield	2.03%		'
Total investment securities amortized cost	63,501		61,019
Total investment securities, percentage	83.40%		83.10%
Mortgage-Backed Securities [Member] | Maturing in one year or less [Member]	'		'
Investment Securities [Line Items]	'		'
Available-for-sale, securities maturing within one year, amortized cost	482		'
Available-for-sale, securities maturing within one year, fair value	486		'
Available-for-sale securities, total, weighted average maturity in years	'8 months 12 days		'
Available-for-sale securities, maturing in one year or less, weighted average yield	1.98%		'
Held-to-maturity securities, maturities within one year, amortized cost	23		'
Held-to-maturity securities, maturities within one year, fair value	23		'
Held-to-maturity securities, total, weighted average maturity in years	'7 months 6 days		'
Held-to-maturity securities, maturing in one year or less, weighted average yield	2.13%		'
Mortgage-Backed Securities [Member] | Maturing after one year through five years [Member]	'		'
Investment Securities [Line Items]	'		'
Available-for-sale, securities maturing after one through five year, amortized cost	16,679		'
Available-for-sale, securities maturing after one through five year, fair value	16,697		'
Available-for-sale securities, total, weighted average maturity in years	'3 years 9 months 18 days		'
Available for sale securities, maturing after one year through five years weighted average yield	2.17%		'
Held-to-maturity securities, maturities after one year through five years, amortized cost	23,127		'
Held to maturity securities, maturities after one year through five years, fair value	23,060		'
Held-to-maturity securities, total, weighted average maturity in years	'3 years 7 months 6 days		'
Held-to-maturity securities, maturing after one year through five years, weighted average yield	2.17%		'
Mortgage-Backed Securities [Member] | Maturing after five years through ten years [Member]	'		'
Investment Securities [Line Items]	'		'
Available-for-sale, securities maturing after five through ten year, amortized cost	11,086		'
Available-for-sale, securities maturing after five through ten year, fair value	11,126		'
Available-for-sale securities, total, weighted average maturity in years	'5 years 10 months 24 days		'
Available-for-sale securities, maturing after five years through ten years, weighted average yield	1.90%		'
Held-to-maturity securities, maturities after five years through ten years, amortized cost	9,496		'
Held-to-maturity securities, maturities after five year through ten years, fair value	9,331		'
Held-to-maturity securities, total, weighted average maturity in years	'5 years 7 months 6 days		'
Held-to-maturity securities, maturing after five year through ten years, weighted average yield	1.75%		'
Mortgage-Backed Securities [Member] | Maturing after ten years [Member]	'		'
Investment Securities [Line Items]	'		'
Available-for-sale, securities maturing after ten years, amortized cost	1,874		'
Available-for-sale, securities maturing after ten years, fair value	1,883		'
Available-for-sale securities, total, weighted average maturity in years	'12 years 9 months 18 days		'
Available-for-sale securities, maturing after ten years, weighted average yield	1.23%		'
Held-to-maturity securities, maturities after ten years, amortized cost	734		'
Held-to-maturity securities, maturities after ten years, fair value	746		'
Held-to-maturity securities, total, weighted average maturity in years	'12 years 2 months 12 days		'
Held-to-maturity securities, maturing after ten years, weighted average yield	1.27%		'
Asset-Backed Securities [Member]	'		'
Investment Securities [Line Items]	'		'
Available-for-sale securities, total, amortized cost	618		'
Available-for-sale securities, total, fair value	635		'
Available-for-sale securities, total, weighted average maturity in years	'6 years 4 months 24 days		'
Available-for-sale securities, total, weighted average yield	2.66%		'
Held-to-maturity securities, total, amortized cost	18		'
Held-to-maturity securities, total, fair value	29		'
Held-to-maturity securities, total, weighted average maturity in years	'6 years 3 months 18 days		'
Held-to-maturity securities, total, weighted average yield	0.85%		'
Total investment securities amortized cost	636		637
Total investment securities, percentage	0.80%		0.90%
Asset-Backed Securities [Member] | Maturing in one year or less [Member]	'		'
Investment Securities [Line Items]	'		'
Available-for-sale, securities maturing within one year, amortized cost	'		'
Available-for-sale, securities maturing within one year, fair value	'		'
Available-for-sale securities, total, weighted average maturity in years	'		'
Available-for-sale securities, maturing in one year or less, weighted average yield	7.65%		'
Held-to-maturity securities, maturities within one year, amortized cost	'		'
Held-to-maturity securities, maturities within one year, fair value	'		'
Held-to-maturity securities, total, weighted average maturity in years	'3 months 18 days		'
Held-to-maturity securities, maturing in one year or less, weighted average yield	0.41%		'
Asset-Backed Securities [Member] | Maturing after one year through five years [Member]	'		'
Investment Securities [Line Items]	'		'
Available-for-sale, securities maturing after one through five year, amortized cost	56		'
Available-for-sale, securities maturing after one through five year, fair value	62		'
Available-for-sale securities, total, weighted average maturity in years	'2 years 8 months 12 days		'
Available for sale securities, maturing after one year through five years weighted average yield	2.58%		'
Held-to-maturity securities, maturities after one year through five years, amortized cost	11		'
Held to maturity securities, maturities after one year through five years, fair value	14		'
Held-to-maturity securities, total, weighted average maturity in years	'3 years 7 months 6 days		'
Held-to-maturity securities, maturing after one year through five years, weighted average yield	0.85%		'
Asset-Backed Securities [Member] | Maturing after five years through ten years [Member]	'		'
Investment Securities [Line Items]	'		'
Available-for-sale, securities maturing after five through ten year, amortized cost	562		'
Available-for-sale, securities maturing after five through ten year, fair value	573		'
Available-for-sale securities, total, weighted average maturity in years	'6 years 9 months 18 days		'
Available-for-sale securities, maturing after five years through ten years, weighted average yield	2.66%		'
Held-to-maturity securities, maturities after five years through ten years, amortized cost	5		'
Held-to-maturity securities, maturities after five year through ten years, fair value	5		'
Held-to-maturity securities, total, weighted average maturity in years	'6 years 8 months 12 days		'
Held-to-maturity securities, maturing after five year through ten years, weighted average yield	0.90%		'
Asset-Backed Securities [Member] | Maturing after ten years [Member]	'		'
Investment Securities [Line Items]	'		'
Available-for-sale, securities maturing after ten years, amortized cost	'		'
Available-for-sale, securities maturing after ten years, fair value	'		'
Available-for-sale securities, total, weighted average maturity in years	'17 years 9 months 18 days		'
Available-for-sale securities, maturing after ten years, weighted average yield	5.19%		'
Held-to-maturity securities, maturities after ten years, amortized cost	2		'
Held-to-maturity securities, maturities after ten years, fair value	10		'
Held-to-maturity securities, total, weighted average maturity in years	'21 years 3 months 18 days		'
Held-to-maturity securities, maturing after ten years, weighted average yield	0.77%		'
Obligations of state and political subdivisions [Member]	'		'
Investment Securities [Line Items]	'		'
Available-for-sale securities, total, amortized cost	5,732		'
Available-for-sale securities, total, fair value	5,820		'
Available-for-sale securities, total, weighted average maturity in years	'4 years 3 months 18 days		'
Available-for-sale securities, total, weighted average yield	6.61%		'
Held-to-maturity securities, total, amortized cost	17		'
Held-to-maturity securities, total, fair value	17		'
Held-to-maturity securities, total, weighted average maturity in years	'11 years 2 months 12 days		'
Held-to-maturity securities, total, weighted average yield	6.24%		'
Total investment securities amortized cost	5,749		6,079
Total investment securities, percentage	7.60%		8.30%
Obligations of state and political subdivisions [Member] | Maturing in one year or less [Member]	'		'
Investment Securities [Line Items]	'		'
Available-for-sale, securities maturing within one year, amortized cost	62		'
Available-for-sale, securities maturing within one year, fair value	63		'
Available-for-sale securities, total, weighted average maturity in years	'6 months		'
Available-for-sale securities, maturing in one year or less, weighted average yield	6.16%		'
Held-to-maturity securities, maturities within one year, amortized cost	'		'
Held-to-maturity securities, maturities within one year, fair value	'		'
Held-to-maturity securities, total, weighted average maturity in years	'6 months		'
Held-to-maturity securities, maturing in one year or less, weighted average yield	7.31%		'
Obligations of state and political subdivisions [Member] | Maturing after one year through five years [Member]	'		'
Investment Securities [Line Items]	'		'
Available-for-sale, securities maturing after one through five year, amortized cost	4,810		'
Available-for-sale, securities maturing after one through five year, fair value	4,930		'
Available-for-sale securities, total, weighted average maturity in years	'2 years 10 months 24 days		'
Available for sale securities, maturing after one year through five years weighted average yield	6.73%		'
Held-to-maturity securities, maturities after one year through five years, amortized cost	3		'
Held to maturity securities, maturities after one year through five years, fair value	3		'
Held-to-maturity securities, total, weighted average maturity in years	'2 years 2 months 12 days		'
Held-to-maturity securities, maturing after one year through five years, weighted average yield	9.29%		'
Obligations of state and political subdivisions [Member] | Maturing after five years through ten years [Member]	'		'
Investment Securities [Line Items]	'		'
Available-for-sale, securities maturing after five through ten year, amortized cost	486		'
Available-for-sale, securities maturing after five through ten year, fair value	477		'
Available-for-sale securities, total, weighted average maturity in years	'7 years		'
Available-for-sale securities, maturing after five years through ten years, weighted average yield	5.81%		'
Held-to-maturity securities, maturities after five years through ten years, amortized cost	2		'
Held-to-maturity securities, maturities after five year through ten years, fair value	2		'
Held-to-maturity securities, total, weighted average maturity in years	'7 years 4 months 24 days		'
Held-to-maturity securities, maturing after five year through ten years, weighted average yield	7.74%		'
Obligations of state and political subdivisions [Member] | Maturing after ten years [Member]	'		'
Investment Securities [Line Items]	'		'
Available-for-sale, securities maturing after ten years, amortized cost	374		'
Available-for-sale, securities maturing after ten years, fair value	350		'
Available-for-sale securities, total, weighted average maturity in years	'20 years 2 months 12 days		'
Available-for-sale securities, maturing after ten years, weighted average yield	6.14%		'
Held-to-maturity securities, maturities after ten years, amortized cost	12		'
Held-to-maturity securities, maturities after ten years, fair value	12		'
Held-to-maturity securities, total, weighted average maturity in years	'14 years		'
Held-to-maturity securities, maturing after ten years, weighted average yield	5.34%		'
Other Debt Securities and Obligations of Foreign Government [Member]	'		'
Investment Securities [Line Items]	'		'
Available-for-sale securities, total, amortized cost	740		'
Available-for-sale securities, total, fair value	648		'
Available-for-sale securities, total, weighted average maturity in years	'21 years 7 months 6 days		'
Available-for-sale securities, total, weighted average yield	2.71%		'
Held-to-maturity securities, total, amortized cost	121		'
Held-to-maturity securities, total, fair value	109		'
Held-to-maturity securities, total, weighted average maturity in years	'3 years 3 months 18 days		'
Held-to-maturity securities, total, weighted average yield	1.13%		'
Total investment securities amortized cost	1,323		1,329
Total investment securities, percentage	1.70%		1.80%
Other Debt Securities and Obligations of Foreign Government [Member] | Maturing in one year or less [Member]	'		'
Investment Securities [Line Items]	'		'
Available-for-sale, securities maturing within one year, amortized cost	6		'
Available-for-sale, securities maturing within one year, fair value	6		'
Available-for-sale securities, total, weighted average maturity in years	'4 months 24 days		'
Available-for-sale securities, maturing in one year or less, weighted average yield	1.16%		'
Held-to-maturity securities, maturities within one year, amortized cost	4		'
Held-to-maturity securities, maturities within one year, fair value	4		'
Held-to-maturity securities, total, weighted average maturity in years	'7 months 6 days		'
Held-to-maturity securities, maturing in one year or less, weighted average yield	1.46%		'
Other Debt Securities and Obligations of Foreign Government [Member] | Maturing after one year through five years [Member]	'		'
Investment Securities [Line Items]	'		'
Available-for-sale, securities maturing after one through five year, amortized cost	'		'
Available-for-sale, securities maturing after one through five year, fair value	'		'
Available-for-sale securities, total, weighted average maturity in years	'		'
Available for sale securities, maturing after one year through five years weighted average yield	'		'
Held-to-maturity securities, maturities after one year through five years, amortized cost	91		'
Held to maturity securities, maturities after one year through five years, fair value	91		'
Held-to-maturity securities, total, weighted average maturity in years	'2 years 3 months 18 days		'
Held-to-maturity securities, maturing after one year through five years, weighted average yield	1.15%		'
Other Debt Securities and Obligations of Foreign Government [Member] | Maturing after five years through ten years [Member]	'		'
Investment Securities [Line Items]	'		'
Available-for-sale, securities maturing after five through ten year, amortized cost	'		'
Available-for-sale, securities maturing after five through ten year, fair value	'		'
Available-for-sale securities, total, weighted average maturity in years	'		'
Available-for-sale securities, maturing after five years through ten years, weighted average yield	'		'
Held-to-maturity securities, maturities after five years through ten years, amortized cost	26		'
Held-to-maturity securities, maturities after five year through ten years, fair value	14		'
Held-to-maturity securities, total, weighted average maturity in years	'7 years 1 month 6 days		'
Held-to-maturity securities, maturing after five year through ten years, weighted average yield	1.01%		'
Other Debt Securities and Obligations of Foreign Government [Member] | Maturing after ten years [Member]	'		'
Investment Securities [Line Items]	'		'
Available-for-sale, securities maturing after ten years, amortized cost	734		'
Available-for-sale, securities maturing after ten years, fair value	642		'
Available-for-sale securities, total, weighted average maturity in years	'21 years 9 months 18 days		'
Available-for-sale securities, maturing after ten years, weighted average yield	2.73%		'
Held-to-maturity securities, maturities after ten years, amortized cost	'		'
Held-to-maturity securities, maturities after ten years, fair value	'		'
Held-to-maturity securities, total, weighted average maturity in years	'		'
Held-to-maturity securities, maturing after ten years, weighted average yield	'		'
Other Investments Including Perpetual Preferred Securities [Member]	'		'
Investment Securities [Line Items]	'		'
Available-for-sale securities, total, amortized cost	462		'
Available-for-sale securities, total, fair value	491		'
Available-for-sale securities, total, weighted average maturity in years	'14 years		'
Available-for-sale securities, total, weighted average yield	2.12%		'
Held-to-maturity securities, other investments, amortized cost	'		'
Held-to-maturity securities, total, fair value	'		'
Held-to-maturity securities, total, weighted average maturity in years	'		'
Held-to-maturity securities, total, weighted average yield	'		'
[1]	Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

Investment_Securities_Investme1

Investment Securities - Investment Securities (Parenthetical) (Detail)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Amortized Cost And Fair Value Debt Securities [Abstract]	'	'	'
Federal statutory rate	35.00%	35.00%	'
Weighted-average maturity of available-for-sale investment securities	'5 years 6 months	'	'4 years 1 month 6 days
Weighted-average yield of available-for-sale investment securities	2.70%	'	2.93%
Weighted average maturity of held-to-maturity investment securities	'4 years 2 months 12 days	'	'3 years 3 months 18 days
Weighted-average yield of held-to-maturity investment securities	1.97%	'	1.94%

Basis_of_Presentation_Line_of_

Basis of Presentation - Line of Business Financial Performance (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Condensed Income Statement	'	'	'	'
Net interest income (taxable-equivalent basis)	$2,714	$2,783	$8,095	$8,186
Net interest income (taxable-equivalent basis), Percent change	-2.50%	'	-1.10%	'
Noninterest income	2,180	2,395	6,610	7,008
Noninterest income, Percent change	-9.00%	'	-5.70%	'
Securities gains (losses), net	-3	1	8	-18
Securities gains (losses), net, Percent change	'	'	'	'
Total net revenue	4,891	5,179	14,713	15,176
Total net revenue, Percent change	-5.60%	'	-3.10%	'
Noninterest expense	2,510	2,542	7,425	7,562
Noninterest expense, Percent change	-1.30%	'	-1.80%	'
Other intangibles	55	67	167	208
Other intangibles, Percent change	-17.90%	'	-19.70%	'
Total noninterest expense	2,565	2,609	7,592	7,770
Total noninterest expense, Percent change	-1.70%	'	-2.30%	'
Income before provision and income taxes	2,326	2,570	7,121	7,406
Income before provision and income taxes, Percent change	-9.50%	'	-3.80%	'
Provision for credit losses	298	488	1,063	1,439
Provision for credit losses, Percent change	-38.90%	'	-26.10%	'
Income before income taxes	2,028	2,082	6,058	5,967
Income before income taxes, Percent change	-2.60%	'	1.50%	'
Income taxes and taxable-equivalent adjustment	598	650	1,797	1,852
Income taxes and taxable-equivalent adjustment, Percent change	-8.00%	'	-3.00%	'
Net income	1,430	1,432	4,261	4,115
Net income, Percent change	-0.10%	'	3.50%	'
Net (income) loss attributable to noncontrolling interests	38	42	119	112
Net (income) loss attributable to noncontrolling interests, Percent change	-9.50%	'	6.30%	'
Net income attributable to U.S. Bancorp	1,468	1,474	4,380	4,227
Net income attributable to U.S. Bancorp, Percent change	-0.40%	'	3.60%	'
Average Balance Sheet	'	'	'	'
Commercial	68,064	62,192	66,719	59,790
Commercial, Percent change	9.40%	'	11.60%	'
Commercial real estate	38,501	36,630	37,872	36,389
Commercial real estate, Percent change	5.10%	'	4.10%	'
Residential mortgages	49,139	40,969	47,055	39,328
Residential mortgages, Percent change	19.90%	'	19.60%	'
Credit card	16,931	16,551	16,627	16,675
Credit card, Percent change	2.30%	'	-0.30%	'
Other retail	46,994	47,991	47,034	47,940
Other retail, Percent change	-2.10%	'	-1.90%	'
Total loans, excluding covered loans	219,629	204,333	215,307	200,122
Total loans, excluding covered loans, Percent change	7.50%	'	7.60%	'
Covered loans	9,733	12,595	10,375	13,609
Covered loans, Percent change	-22.70%	'	-23.80%	'
Total loans	229,362	216,928	225,682	213,731
Total loans, Percent change	5.70%	'	5.60%	'
Goodwill	9,161	8,934	9,157	8,936
Goodwill, Percent change	2.50%	'	2.50%	'
Other intangible assets	3,399	2,613	3,079	2,715
Other intangible assets, Percent change	30.10%	'	13.40%	'
Assets	352,161	345,653	351,048	340,807
Assets, Percent change	1.90%	'	3.00%	'
Noninterest-bearing deposits	68,264	68,127	67,183	65,423
Noninterest-bearing deposits, Percent change	0.20%	'	2.70%	'
Interest checking	48,235	43,207	48,347	45,522
Interest checking, Percent change	11.60%	'	6.20%	'
Savings products	88,065	77,273	86,635	75,360
Savings products, Percent change	14.00%	'	15.00%	'
Time deposits	47,804	50,674	46,119	46,673
Time deposits, Percent change	-5.70%	'	-1.20%	'
Total deposits	252,368	239,281	248,284	232,978
Total deposits, Percent change	5.50%	'	6.60%	'
Total U.S. Bancorp shareholders' equity	39,936	38,619	39,675	37,105
Total U.S. Bancorp shareholders' equity, Percent change	3.40%	'	6.90%	'
Wholesale Banking and Commercial Real Estate [Member]	'	'	'	'
Condensed Income Statement	'	'	'	'
Net interest income (taxable-equivalent basis)	526	528	1,557	1,584
Net interest income (taxable-equivalent basis), Percent change	-0.40%	'	-1.70%	'
Noninterest income	267	299	819	930
Noninterest income, Percent change	-10.70%	'	-11.90%	'
Securities gains (losses), net	'	'	'	'
Securities gains (losses), net, Percent change	'	'	'	'
Total net revenue	793	827	2,376	2,514
Total net revenue, Percent change	-4.10%	'	-5.50%	'
Noninterest expense	305	310	932	950
Noninterest expense, Percent change	-1.60%	'	-1.90%	'
Other intangibles	2	4	6	12
Other intangibles, Percent change	-50.00%	'	-50.00%	'
Total noninterest expense	307	314	938	962
Total noninterest expense, Percent change	-2.20%	'	-2.50%	'
Income before provision and income taxes	486	513	1,438	1,552
Income before provision and income taxes, Percent change	-5.30%	'	-7.30%	'
Provision for credit losses	-38	'	-120	3
Provision for credit losses, Percent change	'	'	'	'
Income before income taxes	524	513	1,558	1,549
Income before income taxes, Percent change	2.10%	'	0.60%	'
Income taxes and taxable-equivalent adjustment	191	187	567	564
Income taxes and taxable-equivalent adjustment, Percent change	2.10%	'	0.50%	'
Net income	333	326	991	985
Net income, Percent change	2.10%	'	0.60%	'
Net (income) loss attributable to noncontrolling interests	'	'	'	'
Net (income) loss attributable to noncontrolling interests, Percent change	'	'	'	'
Net income attributable to U.S. Bancorp	333	326	991	985
Net income attributable to U.S. Bancorp, Percent change	2.10%	'	0.60%	'
Average Balance Sheet	'	'	'	'
Commercial	51,409	46,131	50,331	44,296
Commercial, Percent change	11.40%	'	13.60%	'
Commercial real estate	20,663	19,661	20,305	19,594
Commercial real estate, Percent change	5.10%	'	3.60%	'
Residential mortgages	24	54	28	61
Residential mortgages, Percent change	-55.60%	'	-54.10%	'
Credit card	'	'	'	'
Credit card, Percent change	'	'	'	'
Other retail	6	7	9	5
Other retail, Percent change	-14.30%	'	80.00%	'
Total loans, excluding covered loans	72,102	65,853	70,673	63,956
Total loans, excluding covered loans, Percent change	9.50%	'	10.50%	'
Covered loans	340	813	394	1,010
Covered loans, Percent change	-58.20%	'	-61.00%	'
Total loans	72,442	66,666	71,067	64,966
Total loans, Percent change	8.70%	'	9.40%	'
Goodwill	1,604	1,604	1,604	1,604
Goodwill, Percent change	'	'	'	'
Other intangible assets	24	34	26	38
Other intangible assets, Percent change	-29.40%	'	-31.60%	'
Assets	78,785	72,579	77,479	70,806
Assets, Percent change	8.60%	'	9.40%	'
Noninterest-bearing deposits	30,925	31,167	30,407	30,762
Noninterest-bearing deposits, Percent change	-0.80%	'	-1.20%	'
Interest checking	10,038	7,897	10,385	10,621
Interest checking, Percent change	27.10%	'	-2.20%	'
Savings products	15,103	10,358	13,354	8,962
Savings products, Percent change	45.80%	'	49.00%	'
Time deposits	22,376	21,247	18,459	17,255
Time deposits, Percent change	5.30%	'	7.00%	'
Total deposits	78,442	70,669	72,605	67,600
Total deposits, Percent change	11.00%	'	7.40%	'
Total U.S. Bancorp shareholders' equity	7,434	6,378	7,331	6,325
Total U.S. Bancorp shareholders' equity, Percent change	16.60%	'	15.90%	'
Consumer and Small Business Banking [Member]	'	'	'	'
Condensed Income Statement	'	'	'	'
Net interest income (taxable-equivalent basis)	1,141	1,193	3,427	3,555
Net interest income (taxable-equivalent basis), Percent change	-4.40%	'	-3.60%	'
Noninterest income	719	930	2,276	2,700
Noninterest income, Percent change	-22.70%	'	-15.70%	'
Securities gains (losses), net	'	'	'	'
Securities gains (losses), net, Percent change	'	'	'	'
Total net revenue	1,860	2,123	5,703	6,255
Total net revenue, Percent change	-12.40%	'	-8.80%	'
Noninterest expense	1,150	1,236	3,514	3,618
Noninterest expense, Percent change	-7.00%	'	-2.90%	'
Other intangibles	10	13	30	39
Other intangibles, Percent change	-23.10%	'	-23.10%	'
Total noninterest expense	1,160	1,249	3,544	3,657
Total noninterest expense, Percent change	-7.10%	'	-3.10%	'
Income before provision and income taxes	700	874	2,159	2,598
Income before provision and income taxes, Percent change	-19.90%	'	-16.90%	'
Provision for credit losses	160	349	578	878
Provision for credit losses, Percent change	-54.20%	'	-34.20%	'
Income before income taxes	540	525	1,581	1,720
Income before income taxes, Percent change	2.90%	'	-8.10%	'
Income taxes and taxable-equivalent adjustment	197	191	576	626
Income taxes and taxable-equivalent adjustment, Percent change	3.10%	'	-8.00%	'
Net income	343	334	1,005	1,094
Net income, Percent change	2.70%	'	-8.10%	'
Net (income) loss attributable to noncontrolling interests	'	'	'	'
Net (income) loss attributable to noncontrolling interests, Percent change	'	'	'	'
Net income attributable to U.S. Bancorp	343	334	1,005	1,094
Net income attributable to U.S. Bancorp, Percent change	2.70%	'	-8.10%	'
Average Balance Sheet	'	'	'	'
Commercial	8,475	8,423	8,468	8,123
Commercial, Percent change	0.60%	'	4.20%	'
Commercial real estate	17,084	16,203	16,806	16,065
Commercial real estate, Percent change	5.40%	'	4.60%	'
Residential mortgages	48,131	40,530	46,251	38,884
Residential mortgages, Percent change	18.80%	'	18.90%	'
Credit card	'	'	'	'
Credit card, Percent change	'	'	'	'
Other retail	44,728	45,653	44,737	45,602
Other retail, Percent change	-2.00%	'	-1.90%	'
Total loans, excluding covered loans	118,418	110,809	116,262	108,674
Total loans, excluding covered loans, Percent change	6.90%	'	7.00%	'
Covered loans	6,434	7,384	6,690	7,629
Covered loans, Percent change	-12.90%	'	-12.30%	'
Total loans	124,852	118,193	122,952	116,303
Total loans, Percent change	5.60%	'	5.70%	'
Goodwill	3,515	3,515	3,515	3,515
Goodwill, Percent change	'	'	'	'
Other intangible assets	2,650	1,764	2,293	1,784
Other intangible assets, Percent change	50.20%	'	28.50%	'
Assets	139,539	135,715	139,027	132,973
Assets, Percent change	2.80%	'	4.60%	'
Noninterest-bearing deposits	22,460	20,981	21,843	19,638
Noninterest-bearing deposits, Percent change	7.00%	'	11.20%	'
Interest checking	32,971	30,020	32,801	29,621
Interest checking, Percent change	9.80%	'	10.70%	'
Savings products	46,483	43,647	46,061	43,022
Savings products, Percent change	6.50%	'	7.10%	'
Time deposits	20,716	23,624	21,590	24,047
Time deposits, Percent change	-12.30%	'	-10.20%	'
Total deposits	122,630	118,272	122,295	116,328
Total deposits, Percent change	3.70%	'	5.10%	'
Total U.S. Bancorp shareholders' equity	12,154	11,551	12,062	11,135
Total U.S. Bancorp shareholders' equity, Percent change	5.20%	'	8.30%	'
Wealth Management and Securities Services [Member]	'	'	'	'
Condensed Income Statement	'	'	'	'
Net interest income (taxable-equivalent basis)	85	87	267	264
Net interest income (taxable-equivalent basis), Percent change	-2.30%	'	1.10%	'
Noninterest income	305	282	910	827
Noninterest income, Percent change	8.20%	'	10.00%	'
Securities gains (losses), net	'	'	'	'
Securities gains (losses), net, Percent change	'	'	'	'
Total net revenue	390	369	1,177	1,091
Total net revenue, Percent change	5.70%	'	7.90%	'
Noninterest expense	322	288	962	854
Noninterest expense, Percent change	11.80%	'	12.60%	'
Other intangibles	9	10	27	30
Other intangibles, Percent change	-10.00%	'	-10.00%	'
Total noninterest expense	331	298	989	884
Total noninterest expense, Percent change	11.10%	'	11.90%	'
Income before provision and income taxes	59	71	188	207
Income before provision and income taxes, Percent change	-16.90%	'	-9.20%	'
Provision for credit losses	6	4	7	5
Provision for credit losses, Percent change	50.00%	'	40.00%	'
Income before income taxes	53	67	181	202
Income before income taxes, Percent change	-20.90%	'	-10.40%	'
Income taxes and taxable-equivalent adjustment	19	24	65	73
Income taxes and taxable-equivalent adjustment, Percent change	-20.80%	'	-11.00%	'
Net income	34	43	116	129
Net income, Percent change	-20.90%	'	-10.10%	'
Net (income) loss attributable to noncontrolling interests	'	'	'	'
Net (income) loss attributable to noncontrolling interests, Percent change	'	'	'	'
Net income attributable to U.S. Bancorp	34	43	116	129
Net income attributable to U.S. Bancorp, Percent change	-20.90%	'	-10.10%	'
Average Balance Sheet	'	'	'	'
Commercial	1,774	1,361	1,687	1,264
Commercial, Percent change	30.30%	'	33.50%	'
Commercial real estate	653	624	654	607
Commercial real estate, Percent change	4.60%	'	7.70%	'
Residential mortgages	983	384	775	379
Residential mortgages, Percent change	'	'	'	'
Credit card	'	'	'	'
Credit card, Percent change	'	'	'	'
Other retail	1,531	1,529	1,544	1,516
Other retail, Percent change	0.10%	'	1.80%	'
Total loans, excluding covered loans	4,941	3,898	4,660	3,766
Total loans, excluding covered loans, Percent change	26.80%	'	23.70%	'
Covered loans	17	11	14	12
Covered loans, Percent change	54.50%	'	16.70%	'
Total loans	4,958	3,909	4,674	3,778
Total loans, Percent change	26.80%	'	23.70%	'
Goodwill	1,533	1,469	1,529	1,468
Goodwill, Percent change	4.40%	'	4.20%	'
Other intangible assets	166	165	174	172
Other intangible assets, Percent change	0.60%	'	1.20%	'
Assets	7,749	6,688	7,513	6,477
Assets, Percent change	15.90%	'	16.00%	'
Noninterest-bearing deposits	13,510	14,862	13,807	13,904
Noninterest-bearing deposits, Percent change	-9.10%	'	-0.70%	'
Interest checking	4,770	3,943	4,716	3,950
Interest checking, Percent change	21.00%	'	19.40%	'
Savings products	26,339	23,089	27,081	23,203
Savings products, Percent change	14.10%	'	16.70%	'
Time deposits	4,170	5,463	5,228	4,892
Time deposits, Percent change	-23.70%	'	6.90%	'
Total deposits	48,789	47,357	50,832	45,949
Total deposits, Percent change	3.00%	'	10.60%	'
Total U.S. Bancorp shareholders' equity	2,398	2,240	2,375	2,223
Total U.S. Bancorp shareholders' equity, Percent change	7.10%	'	6.80%	'
Payment Services [Member]	'	'	'	'
Condensed Income Statement	'	'	'	'
Net interest income (taxable-equivalent basis)	393	382	1,168	1,154
Net interest income (taxable-equivalent basis), Percent change	2.90%	'	1.20%	'
Noninterest income	822	854	2,397	2,402
Noninterest income, Percent change	-3.70%	'	-0.20%	'
Securities gains (losses), net	'	'	'	'
Securities gains (losses), net, Percent change	'	'	'	'
Total net revenue	1,215	1,236	3,565	3,556
Total net revenue, Percent change	-1.70%	'	0.30%	'
Noninterest expense	493	452	1,454	1,344
Noninterest expense, Percent change	9.10%	'	8.20%	'
Other intangibles	34	40	104	127
Other intangibles, Percent change	-15.00%	'	-18.10%	'
Total noninterest expense	527	492	1,558	1,471
Total noninterest expense, Percent change	7.10%	'	5.90%	'
Income before provision and income taxes	688	744	2,007	2,085
Income before provision and income taxes, Percent change	-7.50%	'	-3.70%	'
Provision for credit losses	172	135	553	548
Provision for credit losses, Percent change	27.40%	'	0.90%	'
Income before income taxes	516	609	1,454	1,537
Income before income taxes, Percent change	-15.30%	'	-5.40%	'
Income taxes and taxable-equivalent adjustment	188	222	529	560
Income taxes and taxable-equivalent adjustment, Percent change	-15.30%	'	-5.50%	'
Net income	328	387	925	977
Net income, Percent change	-15.20%	'	-5.30%	'
Net (income) loss attributable to noncontrolling interests	-10	-10	-29	-30
Net (income) loss attributable to noncontrolling interests, Percent change	'	'	3.30%	'
Net income attributable to U.S. Bancorp	318	377	896	947
Net income attributable to U.S. Bancorp, Percent change	-15.60%	'	-5.40%	'
Average Balance Sheet	'	'	'	'
Commercial	6,191	6,062	6,030	5,904
Commercial, Percent change	2.10%	'	2.10%	'
Commercial real estate	'	'	'	'
Commercial real estate, Percent change	'	'	'	'
Residential mortgages	'	'	'	'
Residential mortgages, Percent change	'	'	'	'
Credit card	16,931	16,551	16,627	16,675
Credit card, Percent change	2.30%	'	-0.30%	'
Other retail	729	802	744	817
Other retail, Percent change	-9.10%	'	-8.90%	'
Total loans, excluding covered loans	23,851	23,415	23,401	23,396
Total loans, excluding covered loans, Percent change	1.90%	'	'	'
Covered loans	5	5	5	5
Covered loans, Percent change	'	'	'	'
Total loans	23,856	23,420	23,406	23,401
Total loans, Percent change	1.90%	'	'	'
Goodwill	2,509	2,346	2,509	2,349
Goodwill, Percent change	6.90%	'	6.80%	'
Other intangible assets	557	646	584	717
Other intangible assets, Percent change	-13.80%	'	-18.50%	'
Assets	30,123	29,517	29,659	29,684
Assets, Percent change	2.10%	'	-0.10%	'
Noninterest-bearing deposits	714	623	694	638
Noninterest-bearing deposits, Percent change	14.60%	'	8.80%	'
Interest checking	455	1,346	444	1,329
Interest checking, Percent change	-66.20%	'	-66.60%	'
Savings products	60	40	54	37
Savings products, Percent change	50.00%	'	45.90%	'
Time deposits	'	'	'	'
Time deposits, Percent change	'	'	'	'
Total deposits	1,229	2,009	1,192	2,004
Total deposits, Percent change	-38.80%	'	-40.50%	'
Total U.S. Bancorp shareholders' equity	6,102	5,667	6,033	5,698
Total U.S. Bancorp shareholders' equity, Percent change	7.70%	'	5.90%	'
Treasury and Corporate Support [Member]	'	'	'	'
Condensed Income Statement	'	'	'	'
Net interest income (taxable-equivalent basis)	569	593	1,676	1,629
Net interest income (taxable-equivalent basis), Percent change	-4.00%	'	2.90%	'
Noninterest income	67	30	208	149
Noninterest income, Percent change	'	'	39.60%	'
Securities gains (losses), net	-3	1	8	-18
Securities gains (losses), net, Percent change	'	'	'	'
Total net revenue	633	624	1,892	1,760
Total net revenue, Percent change	1.40%	'	7.50%	'
Noninterest expense	240	256	563	796
Noninterest expense, Percent change	-6.30%	'	-29.30%	'
Other intangibles	'	'	'	'
Other intangibles, Percent change	'	'	'	'
Total noninterest expense	240	256	563	796
Total noninterest expense, Percent change	-6.30%	'	-29.30%	'
Income before provision and income taxes	393	368	1,329	964
Income before provision and income taxes, Percent change	6.80%	'	37.90%	'
Provision for credit losses	-2	'	45	5
Provision for credit losses, Percent change	'	'	'	'
Income before income taxes	395	368	1,284	959
Income before income taxes, Percent change	7.30%	'	33.90%	'
Income taxes and taxable-equivalent adjustment	3	26	60	29
Income taxes and taxable-equivalent adjustment, Percent change	-88.50%	'	'	'
Net income	392	342	1,224	930
Net income, Percent change	14.60%	'	31.60%	'
Net (income) loss attributable to noncontrolling interests	48	52	148	142
Net (income) loss attributable to noncontrolling interests, Percent change	-7.70%	'	4.20%	'
Net income attributable to U.S. Bancorp	440	394	1,372	1,072
Net income attributable to U.S. Bancorp, Percent change	11.70%	'	28.00%	'
Average Balance Sheet	'	'	'	'
Commercial	215	215	203	203
Commercial, Percent change	'	'	'	'
Commercial real estate	101	142	107	123
Commercial real estate, Percent change	-28.90%	'	-13.00%	'
Residential mortgages	1	1	1	4
Residential mortgages, Percent change	'	'	-75.00%	'
Credit card	'	'	'	'
Credit card, Percent change	'	'	'	'
Other retail	'	'	'	'
Other retail, Percent change	'	'	'	'
Total loans, excluding covered loans	317	358	311	330
Total loans, excluding covered loans, Percent change	-11.50%	'	-5.80%	'
Covered loans	2,937	4,382	3,272	4,953
Covered loans, Percent change	-33.00%	'	-33.90%	'
Total loans	3,254	4,740	3,583	5,283
Total loans, Percent change	-31.40%	'	-32.20%	'
Goodwill	'	'	'	'
Goodwill, Percent change	'	'	'	'
Other intangible assets	2	4	2	4
Other intangible assets, Percent change	-50.00%	'	-50.00%	'
Assets	95,965	101,154	97,370	100,867
Assets, Percent change	-5.10%	'	-3.50%	'
Noninterest-bearing deposits	655	494	432	481
Noninterest-bearing deposits, Percent change	32.60%	'	-10.20%	'
Interest checking	1	1	1	1
Interest checking, Percent change	'	'	'	'
Savings products	80	139	85	136
Savings products, Percent change	-42.40%	'	-37.50%	'
Time deposits	542	340	842	479
Time deposits, Percent change	59.40%	'	75.80%	'
Total deposits	1,278	974	1,360	1,097
Total deposits, Percent change	31.20%	'	24.00%	'
Total U.S. Bancorp shareholders' equity	$11,848	$12,783	$11,874	$11,724
Total U.S. Bancorp shareholders' equity, Percent change	-7.30%	'	1.30%	'

Investment_Securities_Investme2

Investment Securities - Investment Securities Held to Maturity (Detail) (USD $)	Sep. 30, 2013		Dec. 31, 2012
In Millions, unless otherwise specified
Schedule of Held-to-maturity Securities [Line Items]	'		'
Held-to-maturity securities, Amortized Cost	$36,904	[1]	$34,389	[1]
Held-to-maturity securities, Unrealized Gains	256		590
Held-to-maturity securities, Unrealized Losses Other-than-Temporary	-1		-3
Held-to-maturity securities, Unrealized Losses Other	-527		-24
Held-to-maturity securities, Fair Value	36,632		34,952
U.S. Treasury and agencies [Member]	'		'
Schedule of Held-to-maturity Securities [Line Items]	'		'
Held-to-maturity securities, Amortized Cost	3,368		3,154
Held-to-maturity securities, Unrealized Gains	9		27
Held-to-maturity securities, Unrealized Losses Other-than-Temporary	'		'
Held-to-maturity securities, Unrealized Losses Other	-60		'
Held-to-maturity securities, Fair Value	3,317		3,181
Collateralized Debt/Loan Obligation Asset-Backed Securities [Member]	'		'
Schedule of Held-to-maturity Securities [Line Items]	'		'
Held-to-maturity securities, Amortized Cost	2		7
Held-to-maturity securities, Unrealized Gains	9		15
Held-to-maturity securities, Unrealized Losses Other-than-Temporary	'		'
Held-to-maturity securities, Unrealized Losses Other	'		'
Held-to-maturity securities, Fair Value	11		22
Asset Backed Securities Other [Member]	'		'
Schedule of Held-to-maturity Securities [Line Items]	'		'
Held-to-maturity securities, Amortized Cost	16		19
Held-to-maturity securities, Unrealized Gains	4		2
Held-to-maturity securities, Unrealized Losses Other-than-Temporary	-1		-3
Held-to-maturity securities, Unrealized Losses Other	-1		-1
Held-to-maturity securities, Fair Value	18		17
Obligations of state and political subdivisions [Member]	'		'
Schedule of Held-to-maturity Securities [Line Items]	'		'
Held-to-maturity securities, Amortized Cost	17		20
Held-to-maturity securities, Unrealized Gains	'		1
Held-to-maturity securities, Unrealized Losses Other-than-Temporary	'		'
Held-to-maturity securities, Unrealized Losses Other	'		'
Held-to-maturity securities, Fair Value	17		21
Obligations of foreign governments [Member]	'		'
Schedule of Held-to-maturity Securities [Line Items]	'		'
Held-to-maturity securities, Amortized Cost	7		7
Held-to-maturity securities, Unrealized Gains	'		'
Held-to-maturity securities, Unrealized Losses Other-than-Temporary	'		'
Held-to-maturity securities, Unrealized Losses Other	'		'
Held-to-maturity securities, Fair Value	7		7
Other debt securities [Member]	'		'
Schedule of Held-to-maturity Securities [Line Items]	'		'
Held-to-maturity securities, Amortized Cost	114		115
Held-to-maturity securities, Unrealized Gains	'		'
Held-to-maturity securities, Unrealized Losses Other-than-Temporary	'		'
Held-to-maturity securities, Unrealized Losses Other	-12		-17
Held-to-maturity securities, Fair Value	102		98
Agency [Member] | Residential [Member]	'		'
Schedule of Held-to-maturity Securities [Line Items]	'		'
Held-to-maturity securities, Amortized Cost	33,378		31,064
Held-to-maturity securities, Unrealized Gains	234		545
Held-to-maturity securities, Unrealized Losses Other-than-Temporary	'		'
Held-to-maturity securities, Unrealized Losses Other	-454		-6
Held-to-maturity securities, Fair Value	33,158		31,603
Residential Non-Agency Non-Prime [Member] | Residential [Member]	'		'
Schedule of Held-to-maturity Securities [Line Items]	'		'
Held-to-maturity securities, Amortized Cost	1		1
Held-to-maturity securities, Unrealized Gains	'		'
Held-to-maturity securities, Unrealized Losses Other-than-Temporary	'		'
Held-to-maturity securities, Unrealized Losses Other	'		'
Held-to-maturity securities, Fair Value	1		1
Non-Agency [Member] | Commercial [Member]	'		'
Schedule of Held-to-maturity Securities [Line Items]	'		'
Held-to-maturity securities, Amortized Cost	1		2
Held-to-maturity securities, Unrealized Gains	'		'
Held-to-maturity securities, Unrealized Losses Other-than-Temporary	'		'
Held-to-maturity securities, Unrealized Losses Other	'		'
Held-to-maturity securities, Fair Value	$1		$2
[1]	Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

Investment_Securities_Investme3

Investment Securities - Investment Securities Available for Sale (Detail) (USD $)	Sep. 30, 2013		Dec. 31, 2012
In Millions, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'		'
Available-for-sale securities, Amortized Cost	$39,240		$39,040
Available-for-sale securities, Unrealized Gains	691		1,246
Available-for-sale securities, Unrealized Losses Other-than-Temporary	-16		-36
Available-for-sale securities, Unrealized Losses Other	-608		-111
Available-for-sale securities, Fair Value	39,307	[1]	40,139	[1]
U.S. Treasury and agencies [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Available-for-sale securities, Amortized Cost	1,567		1,211
Available-for-sale securities, Unrealized Gains	5		16
Available-for-sale securities, Unrealized Losses Other-than-Temporary	'		'
Available-for-sale securities, Unrealized Losses Other	-51		-1
Available-for-sale securities, Fair Value	1,521		1,226
Collateralized Debt/Loan Obligation Asset-Backed Securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Available-for-sale securities, Amortized Cost	20		32
Available-for-sale securities, Unrealized Gains	5		10
Available-for-sale securities, Unrealized Losses Other-than-Temporary	'		'
Available-for-sale securities, Unrealized Losses Other	'		'
Available-for-sale securities, Fair Value	25		42
Asset Backed Securities Other [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Available-for-sale securities, Amortized Cost	598		579
Available-for-sale securities, Unrealized Gains	13		14
Available-for-sale securities, Unrealized Losses Other-than-Temporary	'		'
Available-for-sale securities, Unrealized Losses Other	-1		-1
Available-for-sale securities, Fair Value	610		592
Obligations of state and political subdivisions [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Available-for-sale securities, Amortized Cost	5,732		6,059
Available-for-sale securities, Unrealized Gains	134		396
Available-for-sale securities, Unrealized Losses Other-than-Temporary	'		'
Available-for-sale securities, Unrealized Losses Other	-46		'
Available-for-sale securities, Fair Value	5,820		6,455
Obligations of foreign governments [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Available-for-sale securities, Amortized Cost	6		6
Available-for-sale securities, Unrealized Gains	'		'
Available-for-sale securities, Unrealized Losses Other-than-Temporary	'		'
Available-for-sale securities, Unrealized Losses Other	'		'
Available-for-sale securities, Fair Value	6		6
Corporate debt securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Available-for-sale securities, Amortized Cost	734		814
Available-for-sale securities, Unrealized Gains	'		2
Available-for-sale securities, Unrealized Losses Other-than-Temporary	'		'
Available-for-sale securities, Unrealized Losses Other	-92		-85
Available-for-sale securities, Fair Value	642		731
Perpetual preferred securities [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Available-for-sale securities, Amortized Cost	205		205
Available-for-sale securities, Unrealized Gains	24		27
Available-for-sale securities, Unrealized Losses Other-than-Temporary	'		'
Available-for-sale securities, Unrealized Losses Other	-20		-14
Available-for-sale securities, Fair Value	209		218
Other Investment [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Available-for-sale securities, Amortized Cost	257		182
Available-for-sale securities, Unrealized Gains	25		20
Available-for-sale securities, Unrealized Losses Other-than-Temporary	'		'
Available-for-sale securities, Unrealized Losses Other	'		'
Available-for-sale securities, Fair Value	282		202
Agency [Member] | Residential [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Available-for-sale securities, Amortized Cost	29,136		28,754
Available-for-sale securities, Unrealized Gains	476		746
Available-for-sale securities, Unrealized Losses Other-than-Temporary	'		'
Available-for-sale securities, Unrealized Losses Other	-392		-5
Available-for-sale securities, Fair Value	29,220		29,495
Agency [Member] | Commercial [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Available-for-sale securities, Amortized Cost	165		185
Available-for-sale securities, Unrealized Gains	4		8
Available-for-sale securities, Unrealized Losses Other-than-Temporary	'		'
Available-for-sale securities, Unrealized Losses Other	'		'
Available-for-sale securities, Fair Value	169		193
Residential Non-Agency Prime [Member] | Residential [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Available-for-sale securities, Amortized Cost	513		641
Available-for-sale securities, Unrealized Gains	2		3
Available-for-sale securities, Unrealized Losses Other-than-Temporary	-10		-16
Available-for-sale securities, Unrealized Losses Other	-5		-4
Available-for-sale securities, Fair Value	500		624
Residential Non-Agency Non-Prime [Member] | Residential [Member]	'		'
Schedule of Available-for-sale Securities [Line Items]	'		'
Available-for-sale securities, Amortized Cost	307		372
Available-for-sale securities, Unrealized Gains	3		4
Available-for-sale securities, Unrealized Losses Other-than-Temporary	-6		-20
Available-for-sale securities, Unrealized Losses Other	-1		-1
Available-for-sale securities, Fair Value	$303		$355
[1]	Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

Investment_Securities_Investme4

Investment Securities - Investment Securities Available for Sale (Parenthetical) (Detail)	Sep. 30, 2013
	CreditScore
Investments Debt And Equity Securities [Abstract]	'
Minimum weighted average credit score of prime securities	725
Maximum loan-to-value of prime securities	80.00%

Investment_Securities_Addition

Investment Securities - Additional Information (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Billions, unless otherwise specified
Investments Debt And Equity Securities [Abstract]	'	'
Weighted-average maturity of the available-for-sale investment securities (in years)	'5 years 6 months	'4 years 1 month 6 days
Weighted-average yields of available-for-sale investment securities	2.70%	2.93%
Weighted-average maturity of the held-to-maturity investment securities (in years)	'4 years 2 months 12 days	'3 years 3 months 18 days
Weighted-average yields of held-to-maturity investment securities	1.97%	1.94%
Fair value of securities pledged	$15.50	$20.10
Fair value of securities pledged as collateral where counterparty has right to repledge or resell	$2	$3.50

Investment_Securities_Amount_o

Investment Securities - Amount of Interest Income from Taxable and Non-Taxable Investment Securities (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Taxable And Tax Exempt Interest Income [Abstract]	'	'	'	'
Taxable	$357	$369	$1,029	$1,166
Non-taxable	63	69	193	210
Total interest income from investment securities	$420	$438	$1,222	$1,376

Investment_Securities_Amount_o1

Investment Securities - Amount of Gross Gains and Losses Realized through Sales of Available for Sale Investment Securities (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Investments Debt And Equity Securities [Abstract]	'	'	'	'
Realized gains	'	$115	$21	$145
Realized losses	'	-99	'	-99
Net realized gains (losses)	'	16	21	46
Income tax (benefit) on net realized gains (losses)	'	$7	$8	$18

Investment_Securities_Summary_

Investment Securities - Summary of Other Than Temporary Impairment by Investment Category (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]	'	'	'	'
Other Gains (losses)	$1	$2	$8	$3
Available-for-Sale Securities [Member]	'	'	'	'
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]	'	'	'	'
Losses Recorded in Earnings	-3	-15	-13	-64
Other Gains (losses)	1	2	8	3
Total Available for sale other-than-temporary impairment	-2	-13	-5	-61
Available-for-Sale Securities [Member] | Residential Non-Agency Prime [Member]	'	'	'	'
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]	'	'	'	'
Losses Recorded in Earnings	-1	-5	-5	-8
Other Gains (losses)	'	-3	2	-12
Total Available for sale other-than-temporary impairment	-1	-8	-3	-20
Available-for-Sale Securities [Member] | Residential Non-Agency Non-Prime [Member]	'	'	'	'
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]	'	'	'	'
Losses Recorded in Earnings	-2	-10	-8	-27
Other Gains (losses)	1	5	6	15
Total Available for sale other-than-temporary impairment	-1	-5	-2	-12
Commercial Non-Agency Mortgage-Backed Securities [Member] | Available-for-Sale Securities [Member]	'	'	'	'
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]	'	'	'	'
Losses Recorded in Earnings	'	'	'	-1
Other Gains (losses)	'	'	'	-1
Total Available for sale other-than-temporary impairment	'	'	'	-2
Perpetual preferred securities [Member] | Available-for-Sale Securities [Member]	'	'	'	'
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]	'	'	'	'
Losses Recorded in Earnings	'	'	'	-27
Other Gains (losses)	'	'	'	'
Total Available for sale other-than-temporary impairment	'	'	'	-27
Other Asset-Backed Securities [Member] | Available-for-Sale Securities [Member]	'	'	'	'
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]	'	'	'	'
Losses Recorded in Earnings	'	'	'	-1
Other Gains (losses)	'	'	'	1
Total Available for sale other-than-temporary impairment	'	'	'	'

Investment_Securities_Summary_1

Investment Securities - Summary of Ranges Used in Valuation of Non-Agency Mortgage-Backed Securities Other Than Temporarily Impaired (Detail)	Sep. 30, 2013	Dec. 31, 2012
Prime Minimum [Member]	'	'
Principal Valuation Assumptions Debt Securities Other Than Temporarily Impaired [Line Items]	'	'
Estimated lifetime prepayment rates	12.00%	6.00%
Lifetime probability of default rates	3.00%	3.00%
Lifetime loss severity rates	25.00%	40.00%
Prime Maximum [Member]	'	'
Principal Valuation Assumptions Debt Securities Other Than Temporarily Impaired [Line Items]	'	'
Estimated lifetime prepayment rates	18.00%	22.00%
Lifetime probability of default rates	5.00%	6.00%
Lifetime loss severity rates	50.00%	50.00%
Prime Average [Member]	'	'
Principal Valuation Assumptions Debt Securities Other Than Temporarily Impaired [Line Items]	'	'
Estimated lifetime prepayment rates	13.00%	14.00%
Lifetime probability of default rates	4.00%	4.00%
Lifetime loss severity rates	48.00%	47.00%
Non-Prime Minimum [Member]	'	'
Principal Valuation Assumptions Debt Securities Other Than Temporarily Impaired [Line Items]	'	'
Estimated lifetime prepayment rates	4.00%	3.00%
Lifetime probability of default rates	5.00%	3.00%
Lifetime loss severity rates	15.00%	45.00%
Non-Prime Maximum [Member]	'	'
Principal Valuation Assumptions Debt Securities Other Than Temporarily Impaired [Line Items]	'	'
Estimated lifetime prepayment rates	10.00%	10.00%
Lifetime probability of default rates	10.00%	10.00%
Lifetime loss severity rates	60.00%	65.00%
Non-Prime Average [Member]	'	'
Principal Valuation Assumptions Debt Securities Other Than Temporarily Impaired [Line Items]	'	'
Estimated lifetime prepayment rates	6.00%	6.00%
Lifetime probability of default rates	7.00%	7.00%
Lifetime loss severity rates	51.00%	56.00%

Investment_Securities_Changes_

Investment Securities - Changes in Credit Losses on Debt Securities (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Investments Debt And Equity Securities [Abstract]	'	'	'	'
Balance at beginning of period	$124	$277	$134	$298
Credit losses on securities not previously considered other-than-temporarily impaired	'	2	'	5
Decreases in expected cash flows on securities for which other-than-temporary impairment was previously recognized	3	13	13	32
Total other-than-temporary impairment on debt securities	3	15	13	37
Increases in expected cash flows	-1	'	-2	-14
Realized losses	-4	-4	-18	-33
Credit losses on security sales and securities expected to be sold	'	-142	-5	-142
Balance at end of period	$122	$146	$122	$146

Investment_Securities_Gross_Un

Investment Securities - Gross Unrealized Losses and Fair Value of Company's Investments Securities with Unrealized Losses (Detail) (USD $)	Sep. 30, 2013
In Millions, unless otherwise specified
Schedule Of Fair Value And Gross Unrealized Losses [Abstract]	'
Fair Value Less Than 12 Months	$21,099
Unrealized Losses Less Than 12 Months	-512
Fair Value 12 Months or Greater	108
Unrealized Losses 12 Months or Greater	-16
Fair Value Total	21,207
Unrealized Losses Total	-528
Fair Value Less Than 12 Months	16,340
Unrealized Losses Less Than 12 Months	-496
Fair Value 12 Months or Greater	1,175
Unrealized Losses 12 Months or Greater	-128
Fair Value Total	17,515
Unrealized Losses Total	-624
U.S. Treasury and agencies [Member]	'
Schedule Of Fair Value And Gross Unrealized Losses [Abstract]	'
Fair Value Less Than 12 Months	1,056
Unrealized Losses Less Than 12 Months	-60
Fair Value 12 Months or Greater	'
Unrealized Losses 12 Months or Greater	'
Fair Value Total	1,056
Unrealized Losses Total	-60
Fair Value Less Than 12 Months	853
Unrealized Losses Less Than 12 Months	-51
Fair Value 12 Months or Greater	'
Unrealized Losses 12 Months or Greater	'
Fair Value Total	853
Unrealized Losses Total	-51
Residential [Member] | Agency [Member]	'
Schedule Of Fair Value And Gross Unrealized Losses [Abstract]	'
Fair Value Less Than 12 Months	20,034
Unrealized Losses Less Than 12 Months	-452
Fair Value 12 Months or Greater	85
Unrealized Losses 12 Months or Greater	-2
Fair Value Total	20,119
Unrealized Losses Total	-454
Fair Value Less Than 12 Months	13,540
Unrealized Losses Less Than 12 Months	-389
Fair Value 12 Months or Greater	343
Unrealized Losses 12 Months or Greater	-3
Fair Value Total	13,883
Unrealized Losses Total	-392
Residential [Member] | Residential Non-Agency Prime [Member]	'
Schedule Of Fair Value And Gross Unrealized Losses [Abstract]	'
Fair Value Less Than 12 Months	137
Unrealized Losses Less Than 12 Months	-2
Fair Value 12 Months or Greater	206
Unrealized Losses 12 Months or Greater	-13
Fair Value Total	343
Unrealized Losses Total	-15
Residential [Member] | Residential Non-Agency Non-Prime [Member]	'
Schedule Of Fair Value And Gross Unrealized Losses [Abstract]	'
Fair Value Less Than 12 Months	128
Unrealized Losses Less Than 12 Months	-2
Fair Value 12 Months or Greater	81
Unrealized Losses 12 Months or Greater	-5
Fair Value Total	209
Unrealized Losses Total	-7
Commercial [Member] | Agency [Member]	'
Schedule Of Fair Value And Gross Unrealized Losses [Abstract]	'
Fair Value Less Than 12 Months	61
Unrealized Losses Less Than 12 Months	'
Fair Value 12 Months or Greater	'
Unrealized Losses 12 Months or Greater	'
Fair Value Total	61
Unrealized Losses Total	'
Commercial [Member] | Non-Agency [Member]	'
Schedule Of Fair Value And Gross Unrealized Losses [Abstract]	'
Fair Value Less Than 12 Months	1
Unrealized Losses Less Than 12 Months	'
Fair Value 12 Months or Greater	'
Unrealized Losses 12 Months or Greater	'
Fair Value Total	1
Unrealized Losses Total	'
Asset Backed Securities Other [Member]	'
Schedule Of Fair Value And Gross Unrealized Losses [Abstract]	'
Fair Value Less Than 12 Months	'
Unrealized Losses Less Than 12 Months	'
Fair Value 12 Months or Greater	10
Unrealized Losses 12 Months or Greater	-2
Fair Value Total	10
Unrealized Losses Total	-2
Fair Value Less Than 12 Months	25
Unrealized Losses Less Than 12 Months	-1
Fair Value 12 Months or Greater	3
Unrealized Losses 12 Months or Greater	'
Fair Value Total	28
Unrealized Losses Total	-1
Obligations of state and political subdivisions [Member]	'
Schedule Of Fair Value And Gross Unrealized Losses [Abstract]	'
Fair Value Less Than 12 Months	8
Unrealized Losses Less Than 12 Months	'
Fair Value 12 Months or Greater	'
Unrealized Losses 12 Months or Greater	'
Fair Value Total	8
Unrealized Losses Total	'
Fair Value Less Than 12 Months	1,382
Unrealized Losses Less Than 12 Months	-46
Fair Value 12 Months or Greater	10
Unrealized Losses 12 Months or Greater	'
Fair Value Total	1,392
Unrealized Losses Total	-46
Other debt securities [Member]	'
Schedule Of Fair Value And Gross Unrealized Losses [Abstract]	'
Fair Value Less Than 12 Months	'
Unrealized Losses Less Than 12 Months	'
Fair Value 12 Months or Greater	13
Unrealized Losses 12 Months or Greater	-12
Fair Value Total	13
Unrealized Losses Total	-12
Corporate debt securities [Member]	'
Schedule Of Fair Value And Gross Unrealized Losses [Abstract]	'
Fair Value Less Than 12 Months	214
Unrealized Losses Less Than 12 Months	-5
Fair Value 12 Months or Greater	420
Unrealized Losses 12 Months or Greater	-87
Fair Value Total	634
Unrealized Losses Total	-92
Perpetual preferred securities [Member]	'
Schedule Of Fair Value And Gross Unrealized Losses [Abstract]	'
Fair Value Less Than 12 Months	'
Unrealized Losses Less Than 12 Months	'
Fair Value 12 Months or Greater	112
Unrealized Losses 12 Months or Greater	-20
Fair Value Total	112
Unrealized Losses Total	($20)

Investment_Securities_Gross_Un1

Investment Securities - Gross Unrealized Losses and Fair Value of Company's Investments Securities with Unrealized Losses (Parenthetical) (Detail) (USD $)	Sep. 30, 2013
In Millions, unless otherwise specified
Schedule Of Fair Value And Gross Unrealized Losses [Abstract]	'
Unrealized Losses Total	$22

Loans_and_Allowance_for_Credit2

Loans and Allowance for Credit Losses - Composition of Loan Portfolio (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Accounts Notes And Loans Receivable Classified [Abstract]	'	'
Commercial	$63,696	$60,742
Lease financing	5,262	5,481
Total commercial	68,958	66,223
Commercial Real Estate	'	'
Commercial mortgages	31,467	31,005
Construction and development	7,211	5,948
Total commercial real estate	38,678	36,953
Residential mortgages	36,484	32,648
Home equity loans, first liens	13,686	11,370
Total residential mortgages	50,170	44,018
Credit Card	17,063	17,115
Retail leasing	5,761	5,419
Home equity and second mortgages	15,544	16,726
Revolving credit	3,289	3,332
Installment	5,717	5,463
Automobile	13,130	12,593
Student	3,673	4,179
Total other retail	47,114	47,712
Total loans, excluding covered loans	221,983	212,021
Covered loans	9,396	11,308
Total loans	$231,379	$223,329
Commercial, Percentage	27.50%	27.20%
Lease financing, Percentage	2.30%	2.50%
Total commercial, Percentage	29.80%	29.70%
Commercial mortgages, Percentage	13.60%	13.90%
Construction and development, Percentage	3.10%	2.60%
Total commercial real estate, Percentage	16.70%	16.50%
Residential mortgages, Percentage	15.80%	14.60%
Home equity loans, first liens, Percentage	5.90%	5.10%
Total residential mortgages, Percentage	21.70%	19.70%
Credit Card, Percentage	7.40%	7.70%
Retail leasing, Percentage	2.50%	2.40%
Home equity and second mortgages, Percentage	6.70%	7.50%
Revolving credit, Percentage	1.40%	1.50%
Installment, Percentage	2.40%	2.40%
Automobile, Percentage	5.70%	5.60%
Student, Percentage	1.60%	1.90%
Total other retail, Percentage	20.30%	21.30%
Total loans, excluding covered loans, Percentage	95.90%	94.90%
Covered Loans, Percentage	4.10%	5.10%
Total loans, Percentage	100.00%	100.00%

Loans_and_Allowance_for_Credit3

Loans and Allowance for Credit Losses - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Loans pledged at the Federal Home Loan Bank ("FHLB")	$75,300,000,000	$75,300,000,000	$74,100,000,000
Loans pledged at the Federal Reserve Bank	51,600,000,000	51,600,000,000	48,600,000,000
Unearned interest and deferred fees and costs on loans	539,000,000	539,000,000	753,000,000
Period for capturing full economic cycle in evaluation	'	'12 years	'
Impairment loan threshold for allowance in which loans are individually analyzed	5,000,000	5,000,000	'
Maximum restructuring period under credit card loan financial difficulty modifications	'	'60 months	'
Maximum restructuring period under credit card loan temporary financial hardship modifications	'	'Up to 12 months	'
Outstanding balance of loans where trial period was unsuccessful and no longer eligible for a permanent modification	18,000,000	59,000,000	'
Purchased impaired loans included in covered loans classified as nonperforming assets	9,000,000	9,000,000	82,000,000
Residential Mortgages [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Number of loans in trial period	142	142	'
Outstanding balance of loans in trial period	18,000,000	18,000,000	'
Estimated post-modification balance of loans in trial period	16,000,000	16,000,000	'
Home Equity and Second Mortgages [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Number of loans in trial period	5	5	'
Outstanding balance of loans in trial period	1,000,000	1,000,000	'
Estimated post-modification balance of loans in trial period	1,000,000	1,000,000	'
Loans Purchased from GNMA Mortgage Pools [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Number of loans in trial period	1,905	1,905	'
Outstanding balance of loans in trial period	247,000,000	247,000,000	'
Estimated post-modification balance of loans in trial period	$231,000,000	$231,000,000	'
Government National Mortgage Association [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Number of residential mortgage loans, home equity and second mortgage loans, and GNMA loans where trial period arrangement was unsuccessful	135	441	'

Loans_and_Allowance_for_Credit4

Loans and Allowance for Credit Losses - Changes in Accretable Balance for Purchased Impaired Loans (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Deteriorated Loans Transferred in [Abstract]	'	'	'	'
Balance at beginning of period	$1,802	$2,431	$1,709	$2,619
Purchases	'	'	'	13
Accretion	-119	-109	-380	-337
Disposals	-51	-37	-120	-135
Reclassifications (to)/from nonaccretable difference	119	58	177	191
Other	'	-14	365	-22
Balance at end of period	$1,751	$2,329	$1,751	$2,329

Loans_and_Allowance_for_Credit5

Loans and Allowance for Credit Losses - Activity in Allowance for Credit Losses (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Balance at beginning of period	$4,612	$4,864	$4,733	$5,014
Provision for credit losses	298	488	1,063	1,439
Loans charged off	450	639	1,505	1,951
Less recoveries of loans charged off	-122	-101	-352	-322
Net loans charged off	328	538	1,153	1,629
Other changes	-4	-43	-65	-53
Balance at end of period	4,578	4,771	4,578	4,771
Commercial [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Balance at beginning of period	1,023	1,037	1,051	1,010
Provision for credit losses	19	63	64	247
Loans charged off	65	90	184	296
Less recoveries of loans charged off	-54	-24	-100	-73
Net loans charged off	11	66	84	223
Other changes	'	'	'	'
Balance at end of period	1,031	1,034	1,031	1,034
Commercial Real Estate [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Balance at beginning of period	777	941	857	1,154
Provision for credit losses	-22	-22	-100	-111
Loans charged off	17	47	76	206
Less recoveries of loans charged off	-23	-22	-80	-57
Net loans charged off	-6	25	-4	149
Other changes	'	'	'	'
Balance at end of period	761	894	761	894
Residential Mortgages [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Balance at beginning of period	921	939	935	927
Provision for credit losses	70	143	222	376
Loans charged off	62	127	243	357
Less recoveries of loans charged off	-5	-6	-20	-15
Net loans charged off	57	121	223	342
Other changes	'	'	'	'
Balance at end of period	934	961	934	961
Credit Card [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Balance at beginning of period	874	996	863	992
Provision for credit losses	151	119	495	462
Loans charged off	175	186	559	585
Less recoveries of loans charged off	-15	-19	-66	-79
Net loans charged off	160	167	493	506
Other changes	'	-33	'	-33
Balance at end of period	865	915	865	915
Other Retail [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Balance at beginning of period	838	828	848	831
Provision for credit losses	84	185	305	431
Loans charged off	122	187	412	503
Less recoveries of loans charged off	-24	-30	-83	-97
Net loans charged off	98	157	329	406
Other changes	'	'	'	'
Balance at end of period	824	856	824	856
Total Loans, Excluding Covered Loans [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Balance at beginning of period	4,433	4,741	4,554	4,914
Provision for credit losses	302	488	986	1,405
Loans charged off	441	637	1,474	1,947
Less recoveries of loans charged off	-121	-101	-349	-321
Net loans charged off	320	536	1,125	1,626
Other changes	'	-33	'	-33
Balance at end of period	4,415	4,660	4,415	4,660
Covered Loans [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Balance at beginning of period	179	123	179	100
Provision for credit losses	-4	'	77	34
Loans charged off	9	2	31	4
Less recoveries of loans charged off	-1	'	-3	-1
Net loans charged off	8	2	28	3
Other changes	-4	-10	-65	-20
Balance at end of period	$163	$111	$163	$111

Loans_and_Allowance_for_Credit6

Loans and Allowance for Credit Losses - Additional Detail of Allowance for Credit Losses and Related Loan Balances by Portfolio Type (Detail) (USD $)	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
In Millions, unless otherwise specified
Allowance Balance at End of Period	'	'	'	'	'	'
Loans individually evaluated for impairment	$16	'	$40	'	'	'
TDRs collectively evaluated for impairment	572	'	754	'	'	'
Other loans collectively evaluated for impairment	3,828	'	3,771	'	'	'
Loans acquired with deteriorated credit quality	162	'	168	'	'	'
Total allowance for credit losses	4,578	4,612	4,733	4,771	4,864	5,014
Loan balance at end of period	'	'	'	'	'	'
Loans individually evaluated for impairment	472	'	729	'	'	'
TDRs collectively evaluated for impairment	5,604	'	5,675	'	'	'
Other loans collectively evaluated for impairment	221,139	'	211,514	'	'	'
Loans acquired with deteriorated credit quality	4,164	'	5,411	'	'	'
Total Loans	221,983	'	212,021	'	'	'
Total loans	231,379	'	223,329	'	'	'
Commercial [Member]	'	'	'	'	'	'
Allowance Balance at End of Period	'	'	'	'	'	'
Loans individually evaluated for impairment	9	'	10	'	'	'
TDRs collectively evaluated for impairment	21	'	28	'	'	'
Other loans collectively evaluated for impairment	1,001	'	1,013	'	'	'
Loans acquired with deteriorated credit quality	'	'	'	'	'	'
Total allowance for credit losses	1,031	1,023	1,051	1,034	1,037	1,010
Loan balance at end of period	'	'	'	'	'	'
Loans individually evaluated for impairment	171	'	171	'	'	'
TDRs collectively evaluated for impairment	171	'	185	'	'	'
Other loans collectively evaluated for impairment	68,615	'	65,863	'	'	'
Loans acquired with deteriorated credit quality	1	'	4	'	'	'
Total Loans	68,958	'	66,223	'	'	'
Commercial Real Estate [Member]	'	'	'	'	'	'
Allowance Balance at End of Period	'	'	'	'	'	'
Loans individually evaluated for impairment	7	'	30	'	'	'
TDRs collectively evaluated for impairment	21	'	29	'	'	'
Other loans collectively evaluated for impairment	719	'	791	'	'	'
Loans acquired with deteriorated credit quality	14	'	7	'	'	'
Total allowance for credit losses	761	777	857	894	941	1,154
Loan balance at end of period	'	'	'	'	'	'
Loans individually evaluated for impairment	253	'	510	'	'	'
TDRs collectively evaluated for impairment	360	'	391	'	'	'
Other loans collectively evaluated for impairment	37,979	'	35,952	'	'	'
Loans acquired with deteriorated credit quality	86	'	100	'	'	'
Total Loans	38,678	'	36,953	'	'	'
Residential Mortgages [Member]	'	'	'	'	'	'
Allowance Balance at End of Period	'	'	'	'	'	'
Loans individually evaluated for impairment	'	'	'	'	'	'
TDRs collectively evaluated for impairment	341	'	446	'	'	'
Other loans collectively evaluated for impairment	593	'	489	'	'	'
Loans acquired with deteriorated credit quality	'	'	'	'	'	'
Total allowance for credit losses	934	921	935	961	939	927
Loan balance at end of period	'	'	'	'	'	'
Loans individually evaluated for impairment	'	'	'	'	'	'
TDRs collectively evaluated for impairment	4,357	'	4,199	'	'	'
Other loans collectively evaluated for impairment	45,812	'	39,813	'	'	'
Loans acquired with deteriorated credit quality	1	'	6	'	'	'
Total Loans	50,170	'	44,018	'	'	'
Credit Card [Member]	'	'	'	'	'	'
Allowance Balance at End of Period	'	'	'	'	'	'
Loans individually evaluated for impairment	'	'	'	'	'	'
TDRs collectively evaluated for impairment	101	'	153	'	'	'
Other loans collectively evaluated for impairment	764	'	710	'	'	'
Loans acquired with deteriorated credit quality	'	'	'	'	'	'
Total allowance for credit losses	865	874	863	915	996	992
Loan balance at end of period	'	'	'	'	'	'
Loans individually evaluated for impairment	'	'	'	'	'	'
TDRs collectively evaluated for impairment	335	'	442	'	'	'
Other loans collectively evaluated for impairment	16,728	'	16,673	'	'	'
Loans acquired with deteriorated credit quality	'	'	'	'	'	'
Total Loans	17,063	'	17,115	'	'	'
Other Retail [Member]	'	'	'	'	'	'
Allowance Balance at End of Period	'	'	'	'	'	'
Loans individually evaluated for impairment	'	'	'	'	'	'
TDRs collectively evaluated for impairment	83	'	97	'	'	'
Other loans collectively evaluated for impairment	741	'	751	'	'	'
Loans acquired with deteriorated credit quality	'	'	'	'	'	'
Total allowance for credit losses	824	838	848	856	828	831
Loan balance at end of period	'	'	'	'	'	'
Loans individually evaluated for impairment	'	'	'	'	'	'
TDRs collectively evaluated for impairment	281	'	313	'	'	'
Other loans collectively evaluated for impairment	46,833	'	47,399	'	'	'
Loans acquired with deteriorated credit quality	'	'	'	'	'	'
Total Loans	47,114	'	47,712	'	'	'
Total Loans, Excluding Covered Loans [Member]	'	'	'	'	'	'
Allowance Balance at End of Period	'	'	'	'	'	'
Loans individually evaluated for impairment	16	'	40	'	'	'
TDRs collectively evaluated for impairment	567	'	753	'	'	'
Other loans collectively evaluated for impairment	3,818	'	3,754	'	'	'
Loans acquired with deteriorated credit quality	14	'	7	'	'	'
Total allowance for credit losses	4,415	4,433	4,554	4,660	4,741	4,914
Loan balance at end of period	'	'	'	'	'	'
Loans individually evaluated for impairment	424	'	681	'	'	'
TDRs collectively evaluated for impairment	5,504	'	5,530	'	'	'
Other loans collectively evaluated for impairment	215,967	'	205,700	'	'	'
Loans acquired with deteriorated credit quality	88	'	110	'	'	'
Total Loans	221,983	'	212,021	'	'	'
Covered Loans [Member]	'	'	'	'	'	'
Allowance Balance at End of Period	'	'	'	'	'	'
Loans individually evaluated for impairment	'	'	'	'	'	'
TDRs collectively evaluated for impairment	5	'	1	'	'	'
Other loans collectively evaluated for impairment	10	'	17	'	'	'
Loans acquired with deteriorated credit quality	148	'	161	'	'	'
Total allowance for credit losses	163	179	179	111	123	100
Loan balance at end of period	'	'	'	'	'	'
Loans individually evaluated for impairment	48	'	48	'	'	'
TDRs collectively evaluated for impairment	100	'	145	'	'	'
Other loans collectively evaluated for impairment	5,172	'	5,814	'	'	'
Loans acquired with deteriorated credit quality	4,076	'	5,301	'	'	'
Total loans	$9,396	'	$11,308	'	'	'

Loans_and_Allowance_for_Credit7

Loans and Allowance for Credit Losses - Summary of Loans by Portfolio Type and Deliquency Status (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	$227,395	$218,204
Accruing 30-89 Days Past Due	1,219	1,723
90 Days or More Past Due	1,105	1,323
Nonperforming	1,660	2,079
Total loans, excluding covered loans	221,983	212,021
Total loans	231,379	223,329
Commercial [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	68,573	65,701
Accruing 30-89 Days Past Due	219	341
90 Days or More Past Due	50	58
Nonperforming	116	123
Total loans, excluding covered loans	68,958	66,223
Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	38,253	36,241
Accruing 30-89 Days Past Due	62	158
90 Days or More Past Due	7	8
Nonperforming	356	546
Total loans, excluding covered loans	38,678	36,953
Residential Mortgages [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	48,820	42,728
Accruing 30-89 Days Past Due	350	348
90 Days or More Past Due	268	281
Nonperforming	732	661
Total loans, excluding covered loans	50,170	44,018
Credit Card [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	16,567	16,525
Accruing 30-89 Days Past Due	212	227
90 Days or More Past Due	190	217
Nonperforming	94	146
Total loans, excluding covered loans	17,063	17,115
Other Retail [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	46,598	47,109
Accruing 30-89 Days Past Due	234	290
90 Days or More Past Due	76	96
Nonperforming	206	217
Total loans, excluding covered loans	47,114	47,712
Total Loans, Excluding Covered Loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	218,811	208,304
Accruing 30-89 Days Past Due	1,077	1,364
90 Days or More Past Due	591	660
Nonperforming	1,504	1,693
Total loans, excluding covered loans	221,983	212,021
Covered Loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	8,584	9,900
Accruing 30-89 Days Past Due	142	359
90 Days or More Past Due	514	663
Nonperforming	156	386
Total loans	$9,396	$11,308

Loans_and_Allowance_for_Credit8

Loans and Allowance for Credit Losses - Summary of Loans by Portfolio Type and Deliquency Status (Parenthetical) (Detail) (Government National Mortgage Association [Member], USD $)	Sep. 30, 2013	Dec. 31, 2012
Government National Mortgage Association [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Loans 30-89 days past due purchased from Government National Mortgage Association mortgage pools whose payments are insured by the Federal Housing Administration or guaranteed by the Department of Veterans Affairs, were classified as current	$399,000,000	$441,000,000
Loans 90 days or more past due purchased from Government National Mortgage Association mortgage pools whose payments are insured by the Federal Housing Administration or guaranteed by the Department of Veterans Affairs, were classified as current	$3,500,000,000	$3,200,000,000

Loans_and_Allowance_for_Credit9

Loans and Allowance for Credit Losses - Summary of Loans by Portfolio Type and Company's Internal Credit Quality Rating (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	$221,983	$212,021
Total loans	231,379	223,329
Total outstanding commitments	468,663	451,841
Pass [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	225,223	215,731
Total outstanding commitments	460,484	442,047
Special Mention Criticized [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	1,760	1,850
Total outstanding commitments	3,124	3,231
Classified Criticized [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	4,396	5,748
Total outstanding commitments	5,055	6,563
Total Criticized [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	6,156	7,598
Total outstanding commitments	8,179	9,794
Commercial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	68,958	66,223
Commercial [Member] | Pass [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	66,791	63,906
Commercial [Member] | Special Mention Criticized [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	1,103	1,114
Commercial [Member] | Classified Criticized [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	1,064	1,203
Commercial [Member] | Total Criticized [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	2,167	2,317
Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	38,678	36,953
Commercial Real Estate [Member] | Pass [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	36,796	34,096
Commercial Real Estate [Member] | Special Mention Criticized [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	578	621
Commercial Real Estate [Member] | Classified Criticized [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	1,304	2,236
Commercial Real Estate [Member] | Total Criticized [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	1,882	2,857
Residential Mortgages [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	50,170	44,018
Residential Mortgages [Member] | Pass [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	49,052	42,897
Residential Mortgages [Member] | Special Mention Criticized [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	6	18
Residential Mortgages [Member] | Classified Criticized [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	1,112	1,103
Residential Mortgages [Member] | Total Criticized [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	1,118	1,121
Credit Card [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	17,063	17,115
Credit Card [Member] | Pass [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	16,779	16,752
Credit Card [Member] | Special Mention Criticized [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	'	'
Credit Card [Member] | Classified Criticized [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	284	363
Credit Card [Member] | Total Criticized [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	284	363
Other Retail [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	47,114	47,712
Other Retail [Member] | Pass [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	46,744	47,294
Other Retail [Member] | Special Mention Criticized [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	34	36
Other Retail [Member] | Classified Criticized [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	336	382
Other Retail [Member] | Total Criticized [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	370	418
Total Loans, Excluding Covered Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	221,983	212,021
Total Loans, Excluding Covered Loans [Member] | Pass [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	216,162	204,945
Total Loans, Excluding Covered Loans [Member] | Special Mention Criticized [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	1,721	1,789
Total Loans, Excluding Covered Loans [Member] | Classified Criticized [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	4,100	5,287
Total Loans, Excluding Covered Loans [Member] | Total Criticized [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans, excluding covered loans	5,821	7,076
Covered Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	9,396	11,308
Covered Loans [Member] | Pass [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	9,061	10,786
Covered Loans [Member] | Special Mention Criticized [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	39	61
Covered Loans [Member] | Classified Criticized [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	296	461
Covered Loans [Member] | Total Criticized [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total loans	$335	$522

Recovered_Sheet1

Loans and Allowance for Credit Losses - Summary of Loans by Portfolio Type and Company's Internal Credit Quality Rating (Parenthetical) (Detail) (Government National Mortgage Association [Member], Trouble Debt Restructure [Member], USD $)	Sep. 30, 2013	Dec. 31, 2012
In Billions, unless otherwise specified
Government National Mortgage Association [Member] | Trouble Debt Restructure [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Restructured GNMA loans whose repayments are insured by the Federal Housing Administration or guaranteed by the Department of Veterans Affairs, were classified with a pass rating	$1.90	$2.40
GNMA loans 90 days or more past due whose repayments are insured by the Federal Housing Administration or guaranteed by the Department of Veterans Affairs, were classified with a pass rating	$3.50	$3.20

Recovered_Sheet2

Loans and Allowance for Credit Losses - Summary of Impaired Loans by Portfolio Class (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Financing Receivable, Impaired [Line Items]	'	'
Period-end Recorded Investment	$7,019	$7,659
Unpaid Principal Balance	9,876	11,082
Valuation Allowance	647	838
Commitments to Lend Additional Funds	51	58
Commercial [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Period-end Recorded Investment	375	404
Unpaid Principal Balance	857	1,200
Valuation Allowance	38	40
Commitments to Lend Additional Funds	25	39
Commercial Real Estate [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Period-end Recorded Investment	721	1,077
Unpaid Principal Balance	1,570	2,251
Valuation Allowance	36	70
Commitments to Lend Additional Funds	14	4
Residential Mortgages [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Period-end Recorded Investment	2,762	2,748
Unpaid Principal Balance	3,404	3,341
Valuation Allowance	323	415
Commitments to Lend Additional Funds	2	'
Credit Card [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Period-end Recorded Investment	335	442
Unpaid Principal Balance	335	442
Valuation Allowance	101	153
Commitments to Lend Additional Funds	'	'
Other Retail [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Period-end Recorded Investment	408	443
Unpaid Principal Balance	609	486
Valuation Allowance	86	101
Commitments to Lend Additional Funds	3	3
Total Impaired Loans, Excluding GNMA and Covered Loans [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Period-end Recorded Investment	4,601	5,114
Unpaid Principal Balance	6,775	7,720
Valuation Allowance	584	779
Commitments to Lend Additional Funds	44	46
Loans Purchased from GNMA Mortgage Pools [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Period-end Recorded Investment	1,915	1,778
Unpaid Principal Balance	1,915	1,778
Valuation Allowance	29	39
Commitments to Lend Additional Funds	'	'
Covered Loans [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Period-end Recorded Investment	503	767
Unpaid Principal Balance	1,186	1,584
Valuation Allowance	34	20
Commitments to Lend Additional Funds	$7	$12

Recovered_Sheet3

Loans and Allowance for Credit Losses - Impaired Loans Average Recorded Investment and Interest Income (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Financing Receivable, Impaired [Line Items]	'	'	'	'
Average Recorded Investment	$7,130	$7,639	$7,346	$7,752
Interest Income Recognized	81	85	270	227
Commercial [Member]	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'
Average Recorded Investment	380	413	384	496
Interest Income Recognized	5	6	24	11
Commercial Real Estate [Member]	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'
Average Recorded Investment	819	1,250	950	1,371
Interest Income Recognized	6	12	27	29
Residential Mortgages [Member]	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'
Average Recorded Investment	2,765	2,752	2,744	2,692
Interest Income Recognized	32	31	99	87
Credit Card [Member]	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'
Average Recorded Investment	347	495	380	529
Interest Income Recognized	3	6	12	22
Other Retail [Member]	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'
Average Recorded Investment	417	354	431	259
Interest Income Recognized	7	3	19	7
Total Impaired Loans, Excluding GNMA and Covered Loans [Member]	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'
Average Recorded Investment	4,728	5,264	4,889	5,347
Interest Income Recognized	53	58	181	156
Loans Purchased from GNMA Mortgage Pools [Member]	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'
Average Recorded Investment	1,883	1,492	1,869	1,363
Interest Income Recognized	22	20	68	51
Covered Loans [Member]	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'
Average Recorded Investment	519	883	588	1,042
Interest Income Recognized	$6	$7	$21	$20

Recovered_Sheet4

Loans and Allowance for Credit Losses - Loans Modified as TDRs (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
	SecurityLoan	SecurityLoan	SecurityLoan	SecurityLoan
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Loans	10,584	29,834	33,909	63,784
Pre-Modification Outstanding Loan Balance	$559	$1,409	$1,672	$2,905
Post-Modification Outstanding Loan Balance	529	1,332	1,589	2,817
Commercial [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Loans	551	1,754	1,962	4,081
Pre-Modification Outstanding Loan Balance	62	54	150	215
Post-Modification Outstanding Loan Balance	60	58	140	195
Commercial Real Estate [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Loans	48	63	147	245
Pre-Modification Outstanding Loan Balance	76	91	193	416
Post-Modification Outstanding Loan Balance	73	80	186	390
Residential Mortgages [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Loans	338	2,717	1,575	3,788
Pre-Modification Outstanding Loan Balance	42	344	214	529
Post-Modification Outstanding Loan Balance	42	336	210	517
Credit Card [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Loans	6,447	14,137	20,147	39,040
Pre-Modification Outstanding Loan Balance	39	52	122	189
Post-Modification Outstanding Loan Balance	38	67	122	203
Other Retail [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Loans	847	6,231	3,519	8,028
Pre-Modification Outstanding Loan Balance	21	159	86	194
Post-Modification Outstanding Loan Balance	21	156	85	191
Total Loans, Excluding GNMA and Covered Loans [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Loans	8,231	24,902	27,350	55,182
Pre-Modification Outstanding Loan Balance	240	700	765	1,543
Post-Modification Outstanding Loan Balance	234	697	743	1,496
Loans Purchased from GNMA Mortgage Pools [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Loans	2,315	4,859	6,450	8,436
Pre-Modification Outstanding Loan Balance	300	660	822	1,116
Post-Modification Outstanding Loan Balance	284	589	782	1,087
Covered Loans [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Loans	38	73	109	166
Pre-Modification Outstanding Loan Balance	19	49	85	246
Post-Modification Outstanding Loan Balance	$11	$46	$64	$234

Recovered_Sheet5

Loans and Allowance for Credit Losses - Schedule of Loans Modified as TDRs that have Subsequently been Fully or Partially Charged-Off or Became 90 Days or More Past Due (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
	SecurityLoan	SecurityLoan	SecurityLoan	SecurityLoan
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Loans	2,755	3,305	12,345	9,938
Amount Defaulted	$208	$99	$966	$519
Commercial [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Loans	143	195	483	652
Amount Defaulted	37	2	42	33
Commercial Real Estate [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Loans	30	13	72	96
Amount Defaulted	18	12	90	176
Residential Mortgages [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Loans	303	116	673	427
Amount Defaulted	41	30	100	64
Credit Card [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Loans	1,485	2,536	5,109	7,452
Amount Defaulted	8	14	29	42
Other Retail [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Loans	278	189	1,164	531
Amount Defaulted	10	4	53	8
Total Loans, Excluding GNMA and Covered Loans [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Loans	2,239	3,049	7,501	9,158
Amount Defaulted	114	62	314	323
Loans Purchased from GNMA Mortgage Pools [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Loans	492	248	4,795	731
Amount Defaulted	69	34	615	106
Covered Loans [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Loans	24	8	49	49
Amount Defaulted	$25	$3	$37	$90

Recovered_Sheet6

Loans and Allowance for Credit Losses - Carrying Amount of Covered Assets (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Covered Assets [Line Items]	'	'
Covered loans	$9,396	$11,308
Total covered assets	9,572	11,505
Purchased Impaired Loans	4,076	5,301
Purchased Nonimpaired Loans	3,535	4,727
Other Assets	1,961	1,477
Commercial [Member]	'	'
Covered Assets [Line Items]	'	'
Covered loans	109	143
Purchased Impaired Loans	'	'
Purchased Nonimpaired Loans	109	143
Other Assets	'	'
Commercial Real Estate [Member]	'	'
Covered Assets [Line Items]	'	'
Covered loans	2,776	4,018
Purchased Impaired Loans	973	1,323
Purchased Nonimpaired Loans	1,803	2,695
Other Assets	'	'
Residential Mortgages [Member]	'	'
Covered Assets [Line Items]	'	'
Covered loans	4,038	5,087
Purchased Impaired Loans	3,103	3,978
Purchased Nonimpaired Loans	935	1,109
Other Assets	'	'
Credit Card [Member]	'	'
Covered Assets [Line Items]	'	'
Covered loans	5	5
Purchased Impaired Loans	'	'
Purchased Nonimpaired Loans	5	5
Other Assets	'	'
Other Retail [Member]	'	'
Covered Assets [Line Items]	'	'
Covered loans	683	775
Purchased Impaired Loans	'	'
Purchased Nonimpaired Loans	683	775
Other Assets	'	'
Losses Reimbursable by FDIC [Member]	'	'
Covered Assets [Line Items]	'	'
Covered loans	820	1,280
Purchased Impaired Loans	'	'
Purchased Nonimpaired Loans	'	'
Other Assets	820	1,280
Unamortized Changes in FDIC asset [Member]	'	'
Covered Assets [Line Items]	'	'
Covered loans	965	'
Purchased Impaired Loans	'	'
Purchased Nonimpaired Loans	'	'
Other Assets	965	'
Covered Loans [Member]	'	'
Covered Assets [Line Items]	'	'
Covered loans	9,396	11,308
Purchased Impaired Loans	4,076	5,301
Purchased Nonimpaired Loans	3,535	4,727
Other Assets	1,785	1,280
Foreclosed Real Estate [Member]	'	'
Covered Assets [Line Items]	'	'
Total covered assets	176	197
Purchased Impaired Loans	'	'
Purchased Nonimpaired Loans	'	'
Other Assets	$176	$197

Recovered_Sheet7

Loans and Allowance for Credit Losses - Carrying Amount of Covered Assets (Parenthetical) (Detail)	9 Months Ended
	Sep. 30, 2013
Receivables [Abstract]	'
Loss sharing agreement remaining term	'6 years

Accounting_for_Transfers_and_S1

Accounting for Transfers and Servicing of Financial Assets and Variable Interest Entities - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Variable Interest Entity [Line Items]	'	'	'	'	'
Realized federal and state income tax credits on investments	$441,000,000	$227,000,000	$981,000,000	$581,000,000	'
Tax advantaged investment costs included in tax expense	132,000,000	123,000,000	512,000,000	316,000,000	'
Tax advantaged investment costs recognized in income statement	292,000,000	263,000,000	931,000,000	677,000,000	'
Decrease in other asset as a result of deconsolidation of VIE'S	4,600,000,000	'	'	'	'
Decrease in long-term debt as a result of deconsolidation of VIE'S	4,600,000,000	'	'	'	'
Company's investment in unconsolidated VIEs	1,000,000,000	'	1,000,000,000	'	'
Aggregate amount of investments in unconsolidated VIEs	2,700,000,000	'	2,700,000,000	'	1,900,000,000
Unfunded capital commitments related to unconsolidated VIEs	1,900,000,000	'	1,900,000,000	'	1,300,000,000
Company's maximum exposure to unconsolidated VIEs, including any tax implications	7,200,000,000	'	7,200,000,000	'	5,200,000,000
Minimum [Member]	'	'	'	'	'
Variable Interest Entity [Line Items]	'	'	'	'	'
Aggregate amount of investments in unconsolidated VIEs	1,000,000	'	1,000,000	'	1,000,000
Maximum [Member]	'	'	'	'	'
Variable Interest Entity [Line Items]	'	'	'	'	'
Aggregate amount of investments in unconsolidated VIEs	40,000,000	'	40,000,000	'	58,000,000
Community Development and Tax Advantaged Investments [Member]	'	'	'	'	'
Variable Interest Entity [Line Items]	'	'	'	'	'
Assets related to consolidated VIEs	1,800,000,000	'	1,800,000,000	'	7,100,000,000
Liabilities related to consolidated VIEs	434,000,000	'	434,000,000	'	5,200,000,000
Aggregate amount of investments in unconsolidated VIEs	2,600,000,000	'	2,600,000,000	'	1,800,000,000
Company's maximum exposure previously recorded tax credits	4,500,000,000	'	4,500,000,000	'	3,300,000,000
Conduit [Member]	'	'	'	'	'
Variable Interest Entity [Line Items]	'	'	'	'	'
Assets related to consolidated VIEs	134,000,000	'	134,000,000	'	144,000,000
Tender Option Bond Program [Member]	'	'	'	'	'
Variable Interest Entity [Line Items]	'	'	'	'	'
Assets related to consolidated VIEs	4,800,000,000	'	4,800,000,000	'	5,300,000,000
Liabilities related to consolidated VIEs	$4,700,000,000	'	$4,700,000,000	'	$5,000,000,000

Mortgage_Servicing_Rights_Addi

Mortgage Servicing Rights - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Transfers And Servicing Of Financial Assets [Abstract]	'	'	'	'	'
Company serviced residential mortgage loan for others	$226,700,000,000	'	$226,700,000,000	'	$215,600,000,000
Gain/Loss on the fair value of mortgage servicing rights and fair value changes of derivatives used to offset MSR	108,000,000	10,000,000	163,000,000	72,000,000	'
Loan servicing fees	$192,000,000	$181,000,000	$566,000,000	$526,000,000	'

Mortgage_Servicing_Rights_Chan

Mortgage Servicing Rights - Changes in Fair Value of Capitalized MSRs (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Transfers And Servicing Of Financial Assets [Abstract]	'	'	'	'
Balance at beginning of period	$2,377	$1,594	$1,700	$1,519
Rights purchased	2	10	7	39
Rights capitalized	187	224	674	700
Changes in fair value of MSRs	'	'	'	'
Due to fluctuations in market interest rates	71	-123	503	-298
Due to revised assumptions or models	42	-2	33	-19
Other changes in fair value	-102	-150	-340	-388
Balance at end of period	$2,577	$1,553	$2,577	$1,553

Mortgage_Servicing_Rights_Sens

Mortgage Servicing Rights - Sensitivity to Changes in Interest Rates to Fair Value of MSRs Portfolio and Related Derivative Instruments (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Down Scenario [Member] | MSR Portfolio [Member]	'	'
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]	'	'
Net fair value 100 basis points	($494)	($370)
Net fair value 50 basis points	-223	-217
Net fair value 25 basis points	-107	-118
Down Scenario [Member] | Derivative Instrument Hedges [Member]	'	'
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]	'	'
Net fair value 100 basis points	427	473
Net fair value 50 basis points	211	249
Net fair value 25 basis points	102	124
Down Scenario [Member] | Net Sensitivity [Member]	'	'
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]	'	'
Net fair value 100 basis points	-67	103
Net fair value 50 basis points	-12	32
Net fair value 25 basis points	-5	6
Up Scenario [Member] | MSR Portfolio [Member]	'	'
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]	'	'
Net fair value 100 basis points	324	480
Net fair value 50 basis points	173	249
Net fair value 25 basis points	92	126
Up Scenario [Member] | Derivative Instrument Hedges [Member]	'	'
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]	'	'
Net fair value 100 basis points	-317	-486
Net fair value 50 basis points	-174	-243
Net fair value 25 basis points	-93	-121
Up Scenario [Member] | Net Sensitivity [Member]	'	'
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]	'	'
Net fair value 100 basis points	7	-6
Net fair value 50 basis points	-1	6
Net fair value 25 basis points	($1)	$5

Mortgage_Servicing_Rights_MSRs

Mortgage Servicing Rights - MSRs and Related Characteristics by Portfolio (Detail) (USD $)	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
In Millions, unless otherwise specified	BasisPoint		BasisPoint
	Multiple		Multiple
Servicing Assets at Fair Value [Line Items]	'	'	'	'	'	'
Servicing portfolio	$226,727	'	$215,637	'	'	'
Fair value	2,577	2,377	1,700	1,553	1,594	1,519
Value (bps)	114	'	79	'	'	'
Weighted-average servicing fees (bps)	30	'	31	'	'	'
Multiple (value/servicing fees)	3.8	'	2.55	'	'	'
Weighted-average note rate	4.24%	'	4.54%	'	'	'
Weighted-average age (in years)	'2 years 6 months	'	'2 years 7 months 6 days	'	'	'
Weighted-average expected prepayment (constant prepayment rate)	12.30%	'	20.10%	'	'	'
Weighted-average expected life (in years)	'6 years 8 months 12 days	'	'4 years 2 months 12 days	'	'	'
Weighted-average discount rate	10.20%	'	10.40%	'	'	'
MRBP [Member]	'	'	'	'	'	'
Servicing Assets at Fair Value [Line Items]	'	'	'	'	'	'
Servicing portfolio	15,088	'	14,143	'	'	'
Fair value	171	'	154	'	'	'
Value (bps)	113	'	109	'	'	'
Weighted-average servicing fees (bps)	39	'	40	'	'	'
Multiple (value/servicing fees)	2.9	'	2.73	'	'	'
Weighted-average note rate	4.76%	'	5.13%	'	'	'
Weighted-average age (in years)	'4 years	'	'4 years 2 months 12 days	'	'	'
Weighted-average expected prepayment (constant prepayment rate)	13.10%	'	13.20%	'	'	'
Weighted-average expected life (in years)	'6 years 3 months 18 days	'	'6 years 1 month 6 days	'	'	'
Weighted-average discount rate	12.00%	'	12.10%	'	'	'
Government [Member]	'	'	'	'	'	'
Servicing Assets at Fair Value [Line Items]	'	'	'	'	'	'
Servicing portfolio	41,192	'	39,048	'	'	'
Fair value	474	'	314	'	'	'
Value (bps)	115	'	80	'	'	'
Weighted-average servicing fees (bps)	32	'	33	'	'	'
Multiple (value/servicing fees)	3.59	'	2.42	'	'	'
Weighted-average note rate	4.26%	'	4.57%	'	'	'
Weighted-average age (in years)	'2 years 6 months	'	'2 years 4 months 24 days	'	'	'
Weighted-average expected prepayment (constant prepayment rate)	12.60%	'	21.20%	'	'	'
Weighted-average expected life (in years)	'6 years 6 months	'	'4 years 2 months 12 days	'	'	'
Weighted-average discount rate	11.20%	'	11.40%	'	'	'
Conventional [Member]	'	'	'	'	'	'
Servicing Assets at Fair Value [Line Items]	'	'	'	'	'	'
Servicing portfolio	170,447	'	162,446	'	'	'
Fair value	$1,932	'	$1,232	'	'	'
Value (bps)	113	'	76	'	'	'
Weighted-average servicing fees (bps)	29	'	30	'	'	'
Multiple (value/servicing fees)	3.9	'	2.53	'	'	'
Weighted-average note rate	4.19%	'	4.48%	'	'	'
Weighted-average age (in years)	'2 years 4 months 24 days	'	'2 years 6 months	'	'	'
Weighted-average expected prepayment (constant prepayment rate)	12.20%	'	20.40%	'	'	'
Weighted-average expected life (in years)	'6 years 9 months 18 days	'	'4 years 1 month 6 days	'	'	'
Weighted-average discount rate	9.80%	'	10.00%	'	'	'

Preferred_Stock_Number_of_Shar

Preferred Stock - Number of Shares Issued and Outstanding and Carrying Amount of Preferred Stock (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, except Share data, unless otherwise specified
Class of Stock [Line Items]	'	'
Shares Issued and Outstanding	159,910	159,910
Liquidation Preference	$4,936	$4,936
Discount	180	167
Carrying Amount	4,756	4,769
Series A [Member]	'	'
Class of Stock [Line Items]	'	'
Shares Issued and Outstanding	12,510	12,510
Liquidation Preference	1,251	1,251
Discount	145	145
Carrying Amount	1,106	1,106
Series B [Member]	'	'
Class of Stock [Line Items]	'	'
Shares Issued and Outstanding	40,000	40,000
Liquidation Preference	1,000	1,000
Discount	'	'
Carrying Amount	1,000	1,000
Series D [Member]	'	'
Class of Stock [Line Items]	'	'
Shares Issued and Outstanding	'	20,000
Liquidation Preference	'	500
Discount	'	'
Carrying Amount	'	500
Series F [Member]	'	'
Class of Stock [Line Items]	'	'
Shares Issued and Outstanding	44,000	44,000
Liquidation Preference	1,100	1,100
Discount	12	12
Carrying Amount	1,088	1,088
Series G [Member]	'	'
Class of Stock [Line Items]	'	'
Shares Issued and Outstanding	43,400	43,400
Liquidation Preference	1,085	1,085
Discount	10	10
Carrying Amount	1,075	1,075
Series H [Member]	'	'
Class of Stock [Line Items]	'	'
Shares Issued and Outstanding	20,000	'
Liquidation Preference	500	'
Discount	13	'
Carrying Amount	$487	'

Preferred_Stock_Additional_Inf

Preferred Stock - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended		9 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013	2-May-13
				Series H [Member]	Series H [Member]
Class of Stock Disclosures [Abstract]	'	'	'	'	'
Number of preferred stock, shares authorized	50,000,000	50,000,000	50,000,000	'	'
Preferred Stock, Shares Issued	'	'	'	'	20,000
Liquidation preference per share	'	'	'	'	$25,000
Preferred stock dividend rate fixed percentage	'	'	'	5.15%	'
Redemption period of preferred stock	'	'	'	'90 days	'
Preferred stock redemption date	'	'	'	15-Jul-18	'
Impact of preferred stock redemption	'	$8	'	$8	'

Preferred_Stock_Number_of_Shar1

Preferred Stock - Number of Shares Issued and Outstanding and Carrying Amount of Preferred Stock (Parenthetical) (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Equity [Abstract]	'	'
Par value of Preference shares issued and outstanding	$1	$1

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Loss) - Reconciliation of Transactions Affecting Accumulated Other Comprehensive Income (Loss) (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]	'	'	'	'
Balance at beginning of period	($1,288)	($830)	($923)	($1,200)
Changes in unrealized gains and losses, Unrealized Gains (Losses) on Securities Available-For-Sale	-237	300	-1,032	738
Changes in unrealized gains and losses, Unrealized Gains (Losses) on Derivative Hedges	-17	-30	33	-68
Changes in unrealized gains and losses, Unrealized Gains (Losses) on Retirement Plans	38	'	37	'
Changes in unrealized gains and losses	-216	270	-962	670
Other-than-temporary impairment not recognized in earnings on securities available-for-sale	1	2	8	3
Foreign currency translation adjustment	13	26	-20	34
Reclassification to earnings of realized gains and losses	99	69	270	260
Applicable income taxes	40	-140	276	-370
Balance at end of period	-1,351	-603	-1,351	-603
Foreign Currency Translation [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]	'	'	'	'
Balance at beginning of period	-60	-44	-40	-49
Changes in unrealized gains and losses, Unrealized Gains (Losses) on Securities Available-For-Sale	'	'	'	'
Other-than-temporary impairment not recognized in earnings on securities available-for-sale	'	'	'	'
Foreign currency translation adjustment	13	26	-20	34
Reclassification to earnings of realized gains and losses	'	'	'	'
Applicable income taxes	-5	-10	8	-13
Balance at end of period	-52	-28	-52	-28
Unrealized Gains (Losses) on Retirement Plans [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]	'	'	'	'
Balance at beginning of period	-1,184	-977	-1,265	-1,022
Changes in unrealized gains and losses, Unrealized Gains (Losses) on Retirement Plans	38	'	37	'
Other-than-temporary impairment not recognized in earnings on securities available-for-sale	'	'	'	'
Foreign currency translation adjustment	'	'	'	'
Reclassification to earnings of realized gains and losses	62	38	186	112
Applicable income taxes	-38	-14	-80	-43
Balance at end of period	-1,122	-953	-1,122	-953
Unrealized Gains (Losses) on Derivative Hedges [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]	'	'	'	'
Balance at beginning of period	-313	-447	-404	-489
Changes in unrealized gains and losses, Unrealized Gains (Losses) on Derivative Hedges	-17	-30	33	-68
Other-than-temporary impairment not recognized in earnings on securities available-for-sale	'	'	'	'
Foreign currency translation adjustment	'	'	'	'
Reclassification to earnings of realized gains and losses	47	53	142	158
Applicable income taxes	-11	-9	-65	-34
Balance at end of period	-294	-433	-294	-433
Unrealized Gains (Losses) on Securities Transferred From Available For Sale to Held To Maturity [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]	'	'	'	'
Balance at beginning of period	84	134	107	'
Changes in unrealized gains and losses, Unrealized Gains (Losses) on Securities Available-For-Sale	'	'	'	'
Other-than-temporary impairment not recognized in earnings on securities available-for-sale	'	'	'	'
Transfer of securities from available-for-sale to held-to-maturity	'	'	'	224
Foreign currency translation adjustment	'	'	'	'
Reclassification to earnings of realized gains and losses	-13	-21	-50	-28
Applicable income taxes	5	8	19	-75
Balance at end of period	76	121	76	121
Unrealized Gains (Losses) on Securities Available-For-Sale [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]	'	'	'	'
Balance at beginning of period	185	504	679	360
Changes in unrealized gains and losses, Unrealized Gains (Losses) on Securities Available-For-Sale	-237	300	-1,032	738
Other-than-temporary impairment not recognized in earnings on securities available-for-sale	1	2	8	3
Transfer of securities from available-for-sale to held-to-maturity	'	'	'	-224
Foreign currency translation adjustment	'	'	'	'
Reclassification to earnings of realized gains and losses	3	-1	-8	18
Applicable income taxes	89	-115	394	-205
Balance at end of period	$41	$690	$41	$690

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Income (Loss) - Impact to Consolidated Statement of Income for Items Reclassified Out of Accumulated Other Comprehensive Income and into Earnings (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Realized gains (losses) on sale of securities	'	$16	$21	$46
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, Interest income	3,068	3,227	9,217	9,687
Gains (Losses) on derivative hedges	2,658	2,726	7,927	8,018
Actuarial gains (losses), prior service cost (credit) and transition obligation (asset) amortization	-278	-225	-865	-714
Total securities gains (losses), net	-3	1	8	-18
Applicable income taxes	-542	-593	-1,629	-1,684
Net income	1,430	1,432	4,261	4,115
Reclassification out of Accumulated Other Comprehensive Income [Member]	'	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Net income	-61	'	-165	'
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Securities Available-For-Sale [Member]	'	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Realized gains (losses) on sale of securities	'	'	21	'
Other-than-temporary impairment recognized in earnings	-3	'	-13	'
Total securities gains (losses), net	-3	'	8	'
Applicable income taxes	1	'	-3	'
Net income	-2	'	5	'
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Securities Transferred From Available For Sale to Held To Maturity [Member]	'	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, Interest income	13	'	50	'
Applicable income taxes	-5	'	-19	'
Net income	8	'	31	'
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Derivative Hedges [Member]	'	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Gains (Losses) on derivative hedges	-47	'	-142	'
Applicable income taxes	18	'	55	'
Net income	-29	'	-87	'
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Retirement Plans [Member]	'	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Actuarial gains (losses), prior service cost (credit) and transition obligation (asset) amortization	-62	'	-186	'
Applicable income taxes	24	'	72	'
Net income	($38)	'	($114)	'

Earnings_Per_Share_Components_

Earnings Per Share - Components of Earnings Per Share (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]	'	'	'	'
Net income attributable to U.S. Bancorp	$1,468	$1,474	$4,380	$4,227
Preferred dividends	-61	-64	-189	-174
Impact of preferred stock redemption	'	'	-8	'
Earnings allocated to participating stock awards	-7	-6	-20	-19
Net income applicable to U.S. Bancorp common shareholders	$1,400	$1,404	$4,163	$4,034
Average common shares outstanding	1,832	1,886	1,844	1,892
Net effect of the exercise and assumed purchase of stock awards	11	11	10	9
Average diluted common shares outstanding	1,843	1,897	1,854	1,901
Earnings per common share	$0.76	$0.74	$2.26	$2.13
Diluted earnings per common share	$0.76	$0.74	$2.25	$2.12

Earnings_Per_Share_Additional_

Earnings Per Share - Additional Information (Detail) (Stock Option [Member])	3 Months Ended	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Stock Option [Member]	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'
Options outstanding of common shares	10	9	22

Employee_Benefits_Components_o

Employee Benefits - Components of Net Periodic Benefit Cost (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Pension Plans [Member]	'	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'
Service cost	$42	$33	$126	$97
Interest cost	43	42	128	126
Expected return on plan assets	-44	-48	-132	-143
Prior service cost (credit) and transition obligation (asset) amortization	-1	-2	-4	-4
Actuarial loss (gain) amortization	66	41	198	121
Net periodic benefit cost	106	66	316	197
Postretirement Welfare Plan [Member]	'	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'
Service cost	1	2	3	4
Interest cost	1	1	3	5
Expected return on plan assets	'	-1	-1	-2
Prior service cost (credit) and transition obligation (asset) amortization	'	'	'	'
Actuarial loss (gain) amortization	-3	-1	-8	-5
Net periodic benefit cost	($1)	$1	($3)	$2

Income_Taxes_Components_of_Inc

Income Taxes - Components of Income Tax Expense (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Federal	'	'	'	'
Current	$390	$461	$1,506	$1,416
Deferred	57	50	-35	26
Federal income tax	447	511	1,471	1,442
State	'	'	'	'
Current	84	77	161	239
Deferred	11	5	-3	3
State income tax	95	82	158	242
Total income tax provision	$542	$593	$1,629	$1,684

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	9 Months Ended
In Billions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Income Taxes Additional Information [Abstract]	'	'	'
Federal statutory rate	35.00%	35.00%	'
Net deferred tax liability	$1.20	'	$1.30

Income_Taxes_Reconciliation_of

Income Taxes - Reconciliation of Expected Income Tax Expense at Federal Statutory Rate of 35 Percent to Company's Applicable Income Tax Expense (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]	'	'	'	'
Tax at statutory rate	$690	$709	$2,061	$2,030
State income tax, at statutory rates, net of federal tax benefit	62	53	102	157
Tax effect of	'	'	'	'
Tax credits, net of related expenses	-176	-120	-394	-322
Tax-exempt income	-52	-55	-159	-165
Noncontrolling interests	13	15	42	39
Other items	5	-9	-23	-55
Total income tax provision	$542	$593	$1,629	$1,684

Income_Taxes_Reconciliation_of1

Income Taxes - Reconciliation of Expected Income Tax Expense at Federal Statutory Rate of 35 Percent to Company's Applicable Income Tax Expense (Parenthetical) (Detail) (USD $)	3 Months Ended	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013
Income Tax Disclosure [Abstract]	'	'
Tax credits recognized as reduction to related investment asset	$209	$209

Derivative_Instruments_Additio

Derivative Instruments - Additional Information (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Dec. 31, 2013	Sep. 30, 2014
			Scenario, Forecast [Member]	Scenario, Forecast [Member]
Derivative [Line Items]	'	'	'	'
Realized and unrealized losses on derivatives classified as cash flow hedges recorded in other comprehensive income (loss)	$294,000,000	$404,000,000	'	'
Estimated loss to be reclassified from other comprehensive income (loss) into earnings	'	'	30,000,000	116,000,000
Carrying amount of non-derivative debt instruments designated as net investment hedges	0	0	'	'
Fair value of derivatives under collateral agreements in a net liability position	1,100,000,000	'	'	'
Collateral posted by company netted against net liability position	862,000,000	'	'	'
Forward commitments to sell mortgage loans	6,200,000,000	'	'	'
Hedged mortgage loans held for sale	3,100,000,000	'	'	'
Unfunded mortgage loan commitments	$4,200,000,000	'	'	'

Derivative_Instruments_Asset_a

Derivative Instruments - Asset and Liability Management Derivative Positions of Company (Detail) (USD $)	9 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Derivative [Line Items]	'	'
Fair Value, Assets	$1,362	$1,546
Fair Value, Liabilities	1,825	2,178
Asset and Liability Management Positions [Member]	'	'
Derivative [Line Items]	'	'
Notional Value, Assets	22,741	35,234
Fair Value, Assets	284	363
Notional Value, Liabilities	16,715	26,808
Fair Value, Liabilities	706	818
Asset and Liability Management Positions [Member] | Fair Value Hedges [Member] | Interest Rate Contracts [Member] | Receive Fixed/Pay Floating Swaps [Member]	'	'
Derivative [Line Items]	'	'
Notional Value, Assets	500	500
Fair Value, Assets	21	30
Derivative Asset Average Remaining Maturity Period	'2 years 4 months 2 days	'3 years 1 month 2 days
Notional Value, Liabilities	'	'
Fair Value, Liabilities	'	'
Derivative Liability Average Remaining Maturity Period	'	'0 years
Asset and Liability Management Positions [Member] | Cash Flow Hedges [Member] | Interest Rate Contracts [Member] | Receive Fixed/Pay Floating Swaps [Member]	'	'
Derivative [Line Items]	'	'
Notional Value, Assets	7,000	7,000
Fair Value, Assets	31	45
Derivative Asset Average Remaining Maturity Period	'1 year 1 month 6 days	'1 year 10 months 2 days
Notional Value, Liabilities	'	'
Fair Value, Liabilities	'	'
Derivative Liability Average Remaining Maturity Period	'	'0 years
Asset and Liability Management Positions [Member] | Cash Flow Hedges [Member] | Interest Rate Contracts [Member] | Pay Fixed/Receive Floating Swaps [Member]	'	'
Derivative [Line Items]	'	'
Notional Value, Assets	272	32
Fair Value, Assets	17	'
Derivative Asset Average Remaining Maturity Period	'9 years 7 days	'9 years 10 months 17 days
Notional Value, Liabilities	4,288	4,528
Fair Value, Liabilities	548	718
Derivative Liability Average Remaining Maturity Period	'2 years 8 months 16 days	'3 years 9 months 15 days
Asset and Liability Management Positions [Member] | Net Investment Hedges [Member] | Foreign Exchange Forward Contracts [Member]	'	'
Derivative [Line Items]	'	'
Notional Value, Assets	'	758
Fair Value, Assets	'	1
Derivative Asset Average Remaining Maturity Period	'	'26 days
Notional Value, Liabilities	925	'
Fair Value, Liabilities	11	'
Derivative Liability Average Remaining Maturity Period	'18 days	'0 years
Asset and Liability Management Positions [Member] | Other Economic Hedges [Member] | Interest Rate Contracts [Member] | Receive Fixed/Pay Floating Swaps [Member]	'	'
Derivative [Line Items]	'	'
Notional Value, Assets	3,220	350
Fair Value, Assets	83	1
Derivative Asset Average Remaining Maturity Period	'10 years 2 months 23 days	'10 years 2 months 16 days
Notional Value, Liabilities	'	3,775
Fair Value, Liabilities	'	14
Derivative Liability Average Remaining Maturity Period	'	'10 years 2 months 16 days
Asset and Liability Management Positions [Member] | Other Economic Hedges [Member] | Interest Rate Contracts [Member] | Futures and Forwards [Member] | Purchased [Member]	'	'
Derivative [Line Items]	'	'
Notional Value, Assets	4,418	11,164
Fair Value, Assets	88	138
Derivative Asset Average Remaining Maturity Period	'1 month 2 days	'26 days
Notional Value, Liabilities	34	2,921
Fair Value, Liabilities	8	13
Derivative Liability Average Remaining Maturity Period	'29 days	'15 days
Asset and Liability Management Positions [Member] | Other Economic Hedges [Member] | Interest Rate Contracts [Member] | Futures and Forwards [Member] | Written [Member]	'	'
Derivative [Line Items]	'	'
Notional Value, Assets	41	6,299
Fair Value, Assets	2	18
Derivative Asset Average Remaining Maturity Period	'2 months 12 days	'1 month 10 days
Notional Value, Liabilities	6,203	12,223
Fair Value, Liabilities	122	57
Derivative Liability Average Remaining Maturity Period	'1 month 2 days	'1 month 2 days
Asset and Liability Management Positions [Member] | Other Economic Hedges [Member] | Interest Rate Contracts [Member] | Options [Member] | Purchased [Member]	'	'
Derivative [Line Items]	'	'
Notional Value, Assets	2,325	2,435
Fair Value, Assets	'	'
Derivative Asset Average Remaining Maturity Period	'26 days	'26 days
Notional Value, Liabilities	'	'
Fair Value, Liabilities	'	'
Derivative Liability Average Remaining Maturity Period	'	'0 years
Asset and Liability Management Positions [Member] | Other Economic Hedges [Member] | Interest Rate Contracts [Member] | Options [Member] | Written [Member]	'	'
Derivative [Line Items]	'	'
Notional Value, Assets	1,800	4,991
Fair Value, Assets	34	123
Derivative Asset Average Remaining Maturity Period	'1 month 2 days	'1 month 13 days
Notional Value, Liabilities	9	4
Fair Value, Liabilities	'	'
Derivative Liability Average Remaining Maturity Period	'7 days	'22 days
Asset and Liability Management Positions [Member] | Other Economic Hedges [Member] | Foreign Exchange Forward Contracts [Member]	'	'
Derivative [Line Items]	'	'
Notional Value, Assets	1,980	618
Fair Value, Assets	4	4
Derivative Asset Average Remaining Maturity Period	'7 days	'11 days
Notional Value, Liabilities	2,695	1,383
Fair Value, Liabilities	6	6
Derivative Liability Average Remaining Maturity Period	'7 days	'4 days
Asset and Liability Management Positions [Member] | Other Economic Hedges [Member] | Equity Contracts [Member]	'	'
Derivative [Line Items]	'	'
Notional Value, Assets	8	31
Fair Value, Assets	'	'
Derivative Asset Average Remaining Maturity Period	'1 year 8 months 19 days	'2 years 9 months 18 days
Notional Value, Liabilities	66	27
Fair Value, Liabilities	'	'
Derivative Liability Average Remaining Maturity Period	'1 year 10 months 21 days	'2 years 5 months 16 days
Asset and Liability Management Positions [Member] | Other Economic Hedges [Member] | Credit Contracts [Member]	'	'
Derivative [Line Items]	'	'
Notional Value, Assets	1,177	1,056
Fair Value, Assets	4	3
Derivative Asset Average Remaining Maturity Period	'4 years 1 month 13 days	'4 years 6 months 22 days
Notional Value, Liabilities	2,495	1,947
Fair Value, Liabilities	$11	$10
Derivative Liability Average Remaining Maturity Period	'4 years 10 months 28 days	'3 years 1 month 10 days

Derivative_Instruments_Custome

Derivative Instruments - Customer-Related Derivative Positions of Company (Detail) (USD $)	9 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Derivative [Line Items]	'	'
Fair Value, Assets	$1,362	$1,546
Fair Value, Liabilities	1,825	2,178
Customer-Related Positions [Member]	'	'
Derivative [Line Items]	'	'
Notional Value, Assets	32,809	33,440
Fair Value, Assets	1,261	1,443
Notional Value, Liabilities	33,070	33,013
Fair Value, Liabilities	1,174	1,365
Customer-Related Positions [Member] | Interest Rate Contracts [Member] | Receive Fixed/Pay Floating Swaps [Member]	'	'
Derivative [Line Items]	'	'
Notional Value, Assets	13,562	16,671
Fair Value, Assets	736	1,085
Derivative Asset Average Remaining Maturity Period	'5 years 3 months 18 days	'4 years 9 months 11 days
Notional Value, Liabilities	5,138	1,090
Fair Value, Liabilities	70	15
Derivative Liability Average Remaining Maturity Period	'4 years 11 months 23 days	'9 years 3 months 18 days
Customer-Related Positions [Member] | Interest Rate Contracts [Member] | Pay Fixed/Receive Floating Swaps [Member]	'	'
Derivative [Line Items]	'	'
Notional Value, Assets	4,700	928
Fair Value, Assets	76	14
Derivative Asset Average Remaining Maturity Period	'5 years 1 month 24 days	'11 years 1 month 13 days
Notional Value, Liabilities	14,089	16,923
Fair Value, Liabilities	691	1,042
Derivative Liability Average Remaining Maturity Period	'5 years 3 months 4 days	'4 years 8 months 27 days
Customer-Related Positions [Member] | Interest Rate Contracts [Member] | Options [Member] | Purchased [Member]	'	'
Derivative [Line Items]	'	'
Notional Value, Assets	3,681	3,046
Fair Value, Assets	28	16
Derivative Asset Average Remaining Maturity Period	'4 years 5 months 16 days	'5 years 2 months 27 days
Notional Value, Liabilities	107	28
Fair Value, Liabilities	1	'
Derivative Liability Average Remaining Maturity Period	'1 year 1 month 13 days	'4 years 5 months 1 day
Customer-Related Positions [Member] | Interest Rate Contracts [Member] | Options [Member] | Written [Member]	'	'
Derivative [Line Items]	'	'
Notional Value, Assets	107	286
Fair Value, Assets	1	'
Derivative Asset Average Remaining Maturity Period	'1 year 1 month 13 days	'9 months
Notional Value, Liabilities	3,681	2,788
Fair Value, Liabilities	28	16
Derivative Liability Average Remaining Maturity Period	'4 years 5 months 16 days	'5 years 8 months 5 days
Customer-Related Positions [Member] | Foreign Exchange Contract [Member] | Options [Member] | Purchased [Member]	'	'
Derivative [Line Items]	'	'
Notional Value, Assets	367	323
Fair Value, Assets	9	6
Derivative Asset Average Remaining Maturity Period	'7 months 21 days	'6 months 18 days
Notional Value, Liabilities	'	'
Fair Value, Liabilities	'	'
Derivative Liability Average Remaining Maturity Period	'	'
Customer-Related Positions [Member] | Foreign Exchange Contract [Member] | Options [Member] | Written [Member]	'	'
Derivative [Line Items]	'	'
Notional Value, Assets	'	'
Fair Value, Assets	'	'
Notional Value, Liabilities	367	323
Fair Value, Liabilities	9	6
Derivative Liability Average Remaining Maturity Period	'7 months 21 days	'6 months 18 days
Customer-Related Positions [Member] | Foreign Exchange Contract [Member] | Forwards, Spots and Swaps [Member]	'	'
Derivative [Line Items]	'	'
Notional Value, Assets	10,392	12,186
Fair Value, Assets	411	322
Derivative Asset Average Remaining Maturity Period	'8 months 16 days	'5 months 5 days
Notional Value, Liabilities	9,688	11,861
Fair Value, Liabilities	$375	$286
Derivative Liability Average Remaining Maturity Period	'8 months 5 days	'5 months 9 days

Derivative_Instruments_Summary

Derivative Instruments - Summary of Effective Portion of Gains (Losses) Recognized in Other Comprehensive Income (Loss) and Gains (Losses) Reclassified from Other Comprehensive Income (Loss) into Earnings (Detail) (Asset and Liability Management Positions [Member], USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Cash Flow Hedges [Member] | Interest Rate Contracts [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivative Instruments, Gain (Losses) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	($11)	($19)	$22	($42)
Derivative Instruments, Gains (Losses) Reclassified from Other Comprehensive Income (Loss) into Earnings	-30	-33	-88	-98
Net Investment Hedges [Member] | Foreign Exchange Forward Contracts [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivative Instruments, Gain (Losses) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	-29	'	-23	-6
Derivative Instruments, Gains (Losses) Reclassified from Other Comprehensive Income (Loss) into Earnings	'	'	'	'
Net Investment Hedges [Member] | Non-derivative Debt Instruments [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivative Instruments, Gain (Losses) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	'	-11	'	26
Derivative Instruments, Gains (Losses) Reclassified from Other Comprehensive Income (Loss) into Earnings	'	'	'	'

Derivative_Instruments_Summary1

Derivative Instruments - Summary of Gains (Losses) Recognized in Earnings for Fair Value Hedges, Other Economic Hedges and Customer-Related Positions (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Asset and Liability Management Positions [Member] | Interest Rate Contracts [Member] | Other Noninterest Income [Member] | Fair Value Hedges [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Gains (losses) recognized in earnings	'	$2	($7)	$5
Asset and Liability Management Positions [Member] | Interest Rate Contracts [Member] | Mortgage Banking Revenue [Member] | Other Economic Hedges [Member] | Futures and Forwards [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Gains (losses) recognized in earnings	33	-44	569	67
Asset and Liability Management Positions [Member] | Interest Rate Contracts [Member] | Mortgage Banking Revenue [Member] | Other Economic Hedges [Member] | Options [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Gains (losses) recognized in earnings	54	290	200	689
Asset and Liability Management Positions [Member] | Interest Rate Contracts [Member] | Mortgage Banking Revenue [Member] | Other Economic Hedges [Member] | Receive Fixed/Pay Floating Swaps [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Gains (losses) recognized in earnings	-5	48	-264	186
Asset and Liability Management Positions [Member] | Foreign Exchange Cross-Currency Swaps [Member] | Other Noninterest Income [Member] | Fair Value Hedges [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Gains (losses) recognized in earnings	'	'	'	42
Asset and Liability Management Positions [Member] | Foreign Exchange Forward Contracts [Member] | Commercial Products Revenue [Member] | Other Economic Hedges [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Gains (losses) recognized in earnings	-16	-25	18	-62
Asset and Liability Management Positions [Member] | Equity Contracts [Member] | Compensation Expense [Member] | Other Economic Hedges [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Gains (losses) recognized in earnings	'	1	1	2
Asset and Liability Management Positions [Member] | Credit Contracts [Member] | Other Noninterest Income Expense [Member] | Other Economic Hedges [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Gains (losses) recognized in earnings	2	-2	1	-8
Customer-Related Positions [Member] | Interest Rate Contracts [Member] | Other Noninterest Income [Member] | Receive Fixed/Pay Floating Swaps [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Gains (losses) recognized in earnings	13	-16	-288	-10
Customer-Related Positions [Member] | Interest Rate Contracts [Member] | Other Noninterest Income [Member] | Pay Fixed/Receive Floating Swaps [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Gains (losses) recognized in earnings	-10	19	298	15
Customer-Related Positions [Member] | Foreign Exchange Contract [Member] | Commercial Products Revenue [Member] | Forwards, Spots and Swaps [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Gains (losses) recognized in earnings	$15	$13	$36	$36

Derivative_Instruments_Summary2

Derivative Instruments - Summary of Gains (Losses) Recognized in Earnings for Fair Value Hedges, Other Economic Hedges and Customer-Related Positions (Parenthetical) (Detail) (Asset and Liability Management Positions [Member], Fair Value Hedges [Member], USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest Rate Contracts [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Gain losses on items hedged by fair value hedges	$0	($2)	$7	($5)
Foreign Exchange Cross-Currency Swaps [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Gain losses on items hedged by fair value hedges	$0	$0	$0	($44)

Netting_Arrangements_for_Certa2

Netting Arrangements for Certain Financial Instruments - Additional Information (Detail) (USD $)	Sep. 30, 2013
In Billions, unless otherwise specified
Derivatives, Fair Value [Line Items]	'
Notional amount of derivative	$105.30
Exchange Cleared [Member]	'
Derivatives, Fair Value [Line Items]	'
Notional amount of derivative	6.7
Exchange Traded [Member]	'
Derivatives, Fair Value [Line Items]	'
Notional amount of derivative	$3.30

Netting_Arrangements_for_Certa3

Netting Arrangements for Certain Financial Instruments - Information on Company's Accounting Netting Adjustments and Items Not Offset in Consolidated Balance Sheet But Available for Offset in Event of Default (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Offsetting [Abstract]	'	'
Derivative assets Gross Recognized Assets	$1,362	$1,546
Reverse repurchase agreements Gross Recognized Assets	150	363
Securities borrowed Gross Recognized Assets	527	368
Total Gross Recognized Assets	2,039	2,277
Derivative assets Gross amounts assets offset in consolidated balance sheet	-572	-418
Total Gross amounts assets offset in consolidated balance sheet	-572	-418
Derivative assets Net Amounts Presented in the Consolidated Balance Sheet	790	1,128
Reverse repurchase agreements Net Amounts Presented in the Consolidated Balance Sheet	150	363
Securities borrowed Net Amounts Presented in the Consolidated Balance Sheet	527	368
Total Net Amounts Presented in the Consolidated Balance Sheet	1,467	1,859
Derivative assets Gross Amounts Not Offset Consolidated Balance Financial Instruments	-32	-148
Reverse repurchase agreements Gross financial instrument asset amounts not offset in consolidated balance sheet	-35	-44
Securities borrowed Gross financial instrument asset amounts not offset in consolidated balance sheet	-1	'
Total Gross financial instrument asset amounts not offset in consolidated balance sheet	-68	-192
Reverse repurchase agreements Gross collateral received amounts not offset in consolidated balance sheet	-115	-319
Securities borrowed Gross collateral received amounts not offset in consolidated balance sheet	-510	-356
Total Gross collateral received amounts not offset in consolidated balance sheet	-625	-675
Derivative assets Net Amount	758	980
Reverse repurchase agreements Net Amount	'	'
Securities borrowed Net Amount	16	12
Total net amount assets	774	992
Derivative liabilities Gross recognized liabilities	1,825	2,178
Repurchase agreements Gross recognized liabilities	1,940	3,389
Securities loaned Gross recognized liabilities	134	'
Total Gross recognized liabilities	3,899	5,567
Derivative liabilities Gross amounts liabilities offset in consolidated balance sheet	-1,358	-1,549
Total Gross amounts liabilities offset in consolidated balance sheet	-1,358	-1,549
Derivative liabilities Net amounts liabilities presented in consolidated balance sheet	467	629
Repurchase agreements Net amounts liabilities presented in consolidated balance sheet	1,940	3,389
Securities loaned Net amounts liabilities presented in consolidated balance sheet	134	'
Total Net amounts liabilities presented in consolidated balance sheet	2,541	4,018
Derivative liabilities Gross financial instrument liability amounts not offset in consolidated balance sheet	-32	-148
Repurchase agreements Gross financial instrument liability amounts not offset in consolidated balance sheet	-35	-44
Securities loaned Gross financial instruments not offset in consolidated balance sheet	-1	'
Total Gross financial instrument liability amounts not offset in consolidated balance sheet	-68	-192
Repurchase agreements Gross collateral pledged amounts not offset in consolidated balance sheet	-1,905	-3,345
Securities loaned Gross collateral pledged amounts not offset in consolidated balance sheet	-132	'
Total Gross collateral pledged amounts not offset in consolidated balance sheet	-2,037	-3,345
Derivative liabilities Net Amount	435	481
Repurchase agreements net amount	'	'
Securities loaned net Amount	1	'
Total Net Amount Liabilities	$436	$481

Netting_Arrangements_for_Certa4

Netting Arrangements for Certain Financial Instruments - Information on Company's Accounting Netting Adjustments and Items Not Offset in Consolidated Balance Sheet But Available for Offset in Event of Default (Parenthetical) (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Offsetting [Abstract]	'	'
Cash collateral netted against derivative assets	$75	$79
Derivative assets not subject to netting arrangements	183	260
Cash collateral netted against derivative liabilities	862	1,200
Derivative liabilities not subject to netting arrangements	$55	$5

Fair_Values_of_Assets_and_Liab2

Fair Values of Assets and Liabilities - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended						9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013
					Standby Letters of Credit and Unfunded Commitments [Member]	Standby Letters of Credit and Unfunded Commitments [Member]	Other Guarantees [Member]	Other Guarantees [Member]	Minimum [Member]	Maximum [Member]	Average [Member]
Fair Value Disclosures [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Fair value measurement transfers from one level to another	'	'	$0	$0	'	'	'	'	'	'	'
Mortgage loans held for sale measured at fair value gain (loss)	-5	241	-326	501	'	'	'	'	'	'	'
Assumed credit valuation adjustment as percentage of underlying fair value of underlying derivative contracts	'	'	'	'	'	'	'	'	0.00%	95.00%	6.00%
Carrying value of guarantee obligations	'	'	'	'	$410	$415	$368	$452	'	'	'

Fair_Values_of_Assets_and_Liab3

Fair Values of Assets and Liabilities - Valuation Assumption Ranges for Level 3 Available - for - Sale Investment Securities (Detail)	Sep. 30, 2013
Minimum [Member] | Residential Non-Agency Prime [Member] | Residential [Member]	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'
Estimated lifetime prepayment rates	6.00%
Lifetime probability of default rates	'
Lifetime loss severity rates	25.00%
Discount margin	2.00%
Minimum [Member] | Residential Non-Agency Non-Prime [Member] | Residential [Member]	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'
Estimated lifetime prepayment rates	2.00%
Lifetime probability of default rates	4.00%
Lifetime loss severity rates	15.00%
Discount margin	1.00%
Minimum [Member] | Asset-Backed Securities [Member] | Asset Backed Securities Other [Member]	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'
Estimated lifetime prepayment rates	6.00%
Lifetime probability of default rates	4.00%
Lifetime loss severity rates	40.00%
Discount margin	8.00%
Maximum [Member] | Residential Non-Agency Prime [Member] | Residential [Member]	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'
Estimated lifetime prepayment rates	20.00%
Lifetime probability of default rates	7.00%
Lifetime loss severity rates	65.00%
Discount margin	6.00%
Maximum [Member] | Residential Non-Agency Non-Prime [Member] | Residential [Member]	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'
Estimated lifetime prepayment rates	10.00%
Lifetime probability of default rates	11.00%
Lifetime loss severity rates	70.00%
Discount margin	6.00%
Maximum [Member] | Asset-Backed Securities [Member] | Asset Backed Securities Other [Member]	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'
Estimated lifetime prepayment rates	6.00%
Lifetime probability of default rates	4.00%
Lifetime loss severity rates	40.00%
Discount margin	8.00%
Average [Member] | Residential Non-Agency Prime [Member] | Residential [Member]	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'
Estimated lifetime prepayment rates	13.00%
Lifetime probability of default rates	4.00%
Lifetime loss severity rates	43.00%
Discount margin	4.00%
Average [Member] | Residential Non-Agency Non-Prime [Member] | Residential [Member]	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'
Estimated lifetime prepayment rates	6.00%
Lifetime probability of default rates	7.00%
Lifetime loss severity rates	54.00%
Discount margin	3.00%
Average [Member] | Asset-Backed Securities [Member] | Asset Backed Securities Other [Member]	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'
Estimated lifetime prepayment rates	6.00%
Lifetime probability of default rates	4.00%
Lifetime loss severity rates	40.00%
Discount margin	8.00%

Fair_Values_of_Assets_and_Liab4

Fair Values of Assets and Liabilities - Valuation Assumption Ranges for MSRs (Detail)	Sep. 30, 2013	Dec. 31, 2012
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Expected prepayment	12.30%	20.10%
Discount rate	10.20%	10.40%
Minimum [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Expected prepayment	10.00%	'
Discount rate	10.00%	'
Maximum [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Expected prepayment	22.00%	'
Discount rate	13.00%	'
Average [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Expected prepayment	12.00%	'
Discount rate	10.00%	'

Fair_Values_of_Assets_and_Liab5

Fair Values of Assets and Liabilities - Valuation Assumption Ranges for Derivative Commitments (Detail)	Sep. 30, 2013
Minimum [Member]	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'
Expected loan close rate	32.00%
Inherent MSR value (basis points per loan)	0.46%
Maximum [Member]	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'
Expected loan close rate	100.00%
Inherent MSR value (basis points per loan)	2.19%
Average [Member]	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'
Expected loan close rate	76.00%
Inherent MSR value (basis points per loan)	1.08%

Fair_Values_of_Assets_and_Liab6

Fair Values of Assets and Liabilities - Balances of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Sep. 30, 2013		Jun. 30, 2013	Dec. 31, 2012		Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
In Millions, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Derivative liabilities before netting	$1,825		'	$2,178		'	'	'
Derivative liabilities netting	-1,358		'	-1,549		'	'	'
Derivative assets before netting	1,362		'	1,546		'	'	'
Derivative assets netting	-572		'	-418		'	'	'
Available-for-sale securities	39,307	[1]	'	40,139	[1]	'	'	'
Mortgage loans held for sale	3,844		'	7,957		'	'	'
Mortgage servicing rights	2,577		2,377	1,700		1,553	1,594	1,519
Fair Value, Measurements, Recurring [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Derivative liabilities total	522		'	634		'	'	'
Derivative assets total	973		'	1,388		'	'	'
Available-for-sale securities	39,307		'	40,139		'	'	'
Mortgage loans held for sale	3,844		'	7,957		'	'	'
Mortgage servicing rights	2,577		'	1,700		'	'	'
Other assets	1,007		'	480		'	'	'
Total	47,708		'	51,664		'	'	'
Short-term borrowings	764		'	401		'	'	'
Total	1,286		'	1,035		'	'	'
Fair Value, Measurements, Recurring [Member] | U.S. Treasury and Agencies [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	1,521		'	1,226		'	'	'
Fair Value, Measurements, Recurring [Member] | Obligations of state and political subdivisions [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	5,820		'	6,455		'	'	'
Fair Value, Measurements, Recurring [Member] | Obligations of foreign governments [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	6		'	6		'	'	'
Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	642		'	731		'	'	'
Fair Value, Measurements, Recurring [Member] | Perpetual preferred securities [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	209		'	218		'	'	'
Fair Value, Measurements, Recurring [Member] | Other investments [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	282		'	202		'	'	'
Fair Value, Measurements, Recurring [Member] | Residential [Member] | Agency [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	29,220		'	29,495		'	'	'
Fair Value, Measurements, Recurring [Member] | Residential [Member] | Residential Non-Agency Prime [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	500		'	624		'	'	'
Fair Value, Measurements, Recurring [Member] | Residential [Member] | Residential Non-Agency Non-Prime [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	303		'	355		'	'	'
Fair Value, Measurements, Recurring [Member] | Commercial [Member] | Agency [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	169		'	193		'	'	'
Fair Value, Measurements, Recurring [Member] | Asset-Backed Securities [Member] | Collateralized Loan Obligations [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	25		'	42		'	'	'
Fair Value, Measurements, Recurring [Member] | Asset-Backed Securities [Member] | Asset Backed Securities Other [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	610		'	592		'	'	'
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Derivative liabilities before netting	'		'	'		'	'	'
Derivative assets before netting	'		'	'		'	'	'
Available-for-sale securities	728		'	678		'	'	'
Mortgage loans held for sale	'		'	'		'	'	'
Mortgage servicing rights	'		'	'		'	'	'
Other assets	85		'	94		'	'	'
Total	813		'	772		'	'	'
Short-term borrowings	231		'	50		'	'	'
Total	231		'	50		'	'	'
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Treasury and Agencies [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	463		'	491		'	'	'
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Obligations of state and political subdivisions [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Obligations of foreign governments [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Perpetual preferred securities [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Other investments [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	265		'	187		'	'	'
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Residential [Member] | Agency [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Residential [Member] | Residential Non-Agency Prime [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Residential [Member] | Residential Non-Agency Non-Prime [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Commercial [Member] | Agency [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Asset-Backed Securities [Member] | Collateralized Loan Obligations [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Asset-Backed Securities [Member] | Asset Backed Securities Other [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Derivative liabilities before netting	1,827		'	2,128		'	'	'
Derivative assets before netting	875		'	572		'	'	'
Available-for-sale securities	37,727		'	38,458		'	'	'
Mortgage loans held for sale	3,844		'	7,957		'	'	'
Mortgage servicing rights	'		'	'		'	'	'
Other assets	922		'	386		'	'	'
Total	43,368		'	47,373		'	'	'
Short-term borrowings	533		'	351		'	'	'
Total	2,360		'	2,479		'	'	'
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Treasury and Agencies [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	1,058		'	735		'	'	'
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Obligations of state and political subdivisions [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	5,820		'	6,455		'	'	'
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Obligations of foreign governments [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	6		'	6		'	'	'
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	633		'	722		'	'	'
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Perpetual preferred securities [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	209		'	218		'	'	'
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Other investments [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	17		'	15		'	'	'
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Residential [Member] | Agency [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	29,220		'	29,495		'	'	'
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Residential [Member] | Residential Non-Agency Prime [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Residential [Member] | Residential Non-Agency Non-Prime [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Commercial [Member] | Agency [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	169		'	193		'	'	'
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Asset-Backed Securities [Member] | Collateralized Loan Obligations [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	25		'	42		'	'	'
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Asset-Backed Securities [Member] | Asset Backed Securities Other [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	570		'	577		'	'	'
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Derivative liabilities before netting	53		'	55		'	'	'
Derivative assets before netting	670		'	1,234		'	'	'
Available-for-sale securities	852		'	1,003		'	'	'
Mortgage loans held for sale	'		'	'		'	'	'
Mortgage servicing rights	2,577		'	1,700		'	'	'
Other assets	'		'	'		'	'	'
Total	4,099		'	3,937		'	'	'
Short-term borrowings	'		'	'		'	'	'
Total	53		'	55		'	'	'
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Treasury and Agencies [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Obligations of state and political subdivisions [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Obligations of foreign governments [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	9		'	9		'	'	'
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Perpetual preferred securities [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Other investments [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Residential [Member] | Agency [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Residential [Member] | Residential Non-Agency Prime [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	500		'	624		'	'	'
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Residential [Member] | Residential Non-Agency Non-Prime [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	303		'	355		'	'	'
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Commercial [Member] | Agency [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Asset-Backed Securities [Member] | Collateralized Loan Obligations [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Asset-Backed Securities [Member] | Asset Backed Securities Other [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	40		'	15		'	'	'
Netting [Member] | Fair Value, Measurements, Recurring [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Derivative liabilities netting	-1,358		'	-1,549		'	'	'
Derivative assets netting	-572		'	-418		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Mortgage loans held for sale	'		'	'		'	'	'
Mortgage servicing rights	'		'	'		'	'	'
Other assets	'		'	'		'	'	'
Total	-572		'	-418		'	'	'
Short-term borrowings	'		'	'		'	'	'
Total	-1,358		'	-1,549		'	'	'
Netting [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Treasury and Agencies [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Netting [Member] | Fair Value, Measurements, Recurring [Member] | Obligations of state and political subdivisions [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Netting [Member] | Fair Value, Measurements, Recurring [Member] | Obligations of foreign governments [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Netting [Member] | Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Netting [Member] | Fair Value, Measurements, Recurring [Member] | Perpetual preferred securities [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Netting [Member] | Fair Value, Measurements, Recurring [Member] | Other investments [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Netting [Member] | Fair Value, Measurements, Recurring [Member] | Residential [Member] | Agency [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Netting [Member] | Fair Value, Measurements, Recurring [Member] | Residential [Member] | Residential Non-Agency Prime [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Netting [Member] | Fair Value, Measurements, Recurring [Member] | Residential [Member] | Residential Non-Agency Non-Prime [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Netting [Member] | Fair Value, Measurements, Recurring [Member] | Commercial [Member] | Agency [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Netting [Member] | Fair Value, Measurements, Recurring [Member] | Asset-Backed Securities [Member] | Collateralized Loan Obligations [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
Netting [Member] | Fair Value, Measurements, Recurring [Member] | Asset-Backed Securities [Member] | Asset Backed Securities Other [Member]	'		'	'		'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'	'		'	'	'
Available-for-sale securities	'		'	'		'	'	'
[1]	Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

Fair_Values_of_Assets_and_Liab7

Fair Values of Assets and Liabilities - Changes in Fair Value for All Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Residential Non-Agency Prime [Member] | Residential [Member]	'	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'
Beginning of Period Balance	$547	$713	$624	$803
Net Gains (Losses) Included in Net Income	-2	-4	-6	-5
Net Gains (Losses) Included in Other Comprehensive Income (Loss)	-4	23	4	60
Purchases	'	'	'	'
Sales	'	-61	'	-109
Principal Payments	-41	-40	-122	-118
Issuances	'	'	'	'
Settlements	'	'	'	'
End of Period Balance	500	631	500	631
Net Change in Unrealized Gains (Losses) Relating to Assets Still Held at End of Period	-4	26	4	58
Residential Non-Agency Non-Prime [Member] | Residential [Member]	'	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'
Beginning of Period Balance	319	796	355	802
Net Gains (Losses) Included in Net Income	-3	-8	-11	-18
Net Gains (Losses) Included in Other Comprehensive Income (Loss)	-4	132	13	197
Purchases	'	'	'	'
Sales	'	-562	-20	-562
Principal Payments	-9	-18	-34	-79
Issuances	'	'	'	'
Settlements	'	'	'	'
End of Period Balance	303	340	303	340
Net Change in Unrealized Gains (Losses) Relating to Assets Still Held at End of Period	-4	23	14	52
Asset Backed Securities Other [Member] | Asset-Backed Securities [Member]	'	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'
Beginning of Period Balance	40	112	15	117
Net Gains (Losses) Included in Net Income	1	1	2	7
Net Gains (Losses) Included in Other Comprehensive Income (Loss)	-2	-4	-1	'
Purchases	3	3	28	3
Sales	'	-93	'	-93
Principal Payments	-2	-3	-4	-18
Issuances	'	'	'	'
Settlements	'	'	'	'
End of Period Balance	40	16	40	16
Net Change in Unrealized Gains (Losses) Relating to Assets Still Held at End of Period	-2	2	-1	2
Corporate debt securities [Member]	'	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'
Beginning of Period Balance	9	9	9	9
Net Gains (Losses) Included in Net Income	'	'	'	'
Net Gains (Losses) Included in Other Comprehensive Income (Loss)	'	'	'	'
Purchases	'	'	'	'
Sales	'	'	'	'
Principal Payments	'	'	'	'
Issuances	'	'	'	'
Settlements	'	'	'	'
End of Period Balance	9	9	9	9
Net Change in Unrealized Gains (Losses) Relating to Assets Still Held at End of Period	'	'	'	'
Available-for-Sale Securities [Member]	'	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'
Beginning of Period Balance	915	1,769	1,003	1,893
Net Gains (Losses) Included in Net Income	-4	-9	-15	-3
Net Gains (Losses) Included in Other Comprehensive Income (Loss)	-10	146	16	249
Purchases	3	3	28	3
Sales	'	-851	-20	-906
Principal Payments	-52	-62	-160	-240
Issuances	'	'	'	'
Settlements	'	'	'	'
End of Period Balance	852	996	852	996
Net Change in Unrealized Gains (Losses) Relating to Assets Still Held at End of Period	-10	51	17	112
Mortgage servicing rights [Member]	'	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'
Beginning of Period Balance	2,377	1,594	1,700	1,519
Net Gains (Losses) Included in Net Income	11	-275	196	-705
Net Gains (Losses) Included in Other Comprehensive Income (Loss)	'	'	'	'
Purchases	2	10	7	39
Sales	'	'	'	'
Principal Payments	'	'	'	'
Issuances	187	224	674	700
Settlements	'	'	'	'
End of Period Balance	2,577	1,553	2,577	1,553
Net Change in Unrealized Gains (Losses) Relating to Assets Still Held at End of Period	11	-275	196	-705
Commercial Non-Agency Mortgage-Backed Securities [Member]	'	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'
Beginning of Period Balance	'	37	'	42
Net Gains (Losses) Included in Net Income	'	'	'	1
Net Gains (Losses) Included in Other Comprehensive Income (Loss)	'	2	'	'
Sales	'	-39	'	-39
Principal Payments	'	'	'	-4
Net Change in Unrealized Gains (Losses) Relating to Assets Still Held at End of Period	'	'	'	'
Collateralized Loan Obligations [Member] | Asset-Backed Securities [Member]	'	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'
Beginning of Period Balance	'	102	'	120
Net Gains (Losses) Included in Net Income	'	2	'	12
Net Gains (Losses) Included in Other Comprehensive Income (Loss)	'	-7	'	-8
Sales	'	-96	'	-103
Principal Payments	'	-1	'	-21
Net Change in Unrealized Gains (Losses) Relating to Assets Still Held at End of Period	'	'	'	'
Derivative [Member]	'	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'
Beginning of Period Balance	423	1,360	1,179	1,228
Net Gains (Losses) Included in Net Income	182	843	-34	2,050
Net Gains (Losses) Included in Other Comprehensive Income (Loss)	'	'	'	'
Purchases	'	1	1	1
Sales	-2	-1	-4	-3
Principal Payments	'	'	'	'
Issuances	'	'	'	'
Settlements	14	-713	-525	-1,786
End of Period Balance	617	1,490	617	1,490
Net Change in Unrealized Gains (Losses) Relating to Assets Still Held at End of Period	$62	($557)	($565)	($1,407)

Fair_Values_of_Assets_and_Liab8

Fair Values of Assets and Liabilities - Changes in Fair Value for All Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Parenthetical) (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Mortgage Banking Revenue [Member]	'	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'
Net gains and losses on net derivative assets and liabilities included in net income	$93	$719	$88	$1,700
Net Change in net derivative asset and liability unrealized gains (losses) relating to assets still held at end of period	90	-564	-264	1,400
Other Noninterest Income [Member]	'	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'
Net gains and losses on net derivative assets and liabilities included in net income	89	124	-122	344
Net Change in net derivative asset and liability unrealized gains (losses) relating to assets still held at end of period	-28	7	-301	6
Securities Gains Losses [Member]	'	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'
Net gains and losses on available for sale securities included in net income	-3	-15	-13	-37
Interest Income [Member]	'	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'
Net gains and losses on available for sale securities included in net income	($1)	$6	($2)	$34

Fair_Values_of_Assets_and_Liab9

Fair Values of Assets and Liabilities - Adjusted Carrying Values for Assets Measured at Fair Value on Nonrecurring Basis (Detail) (Fair Value, Measurements, Nonrecurring [Member], USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Loans	$94	$140
Other assets	144	194
Level 1 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Loans	'	'
Other assets	'	'
Level 2 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Loans	'	'
Other assets	'	'
Level 3 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Loans	94	140
Other assets	$144	$194

Recovered_Sheet8

Fair Values of Assets and Liabilities - Losses Recognized Related to Nonrecurring Fair Value Measurements of Individual Assets or Portfolios (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]	'	'	'	'
Loans	$22	$12	$55	$51
Other assets	$14	$42	$73	$129

Recovered_Sheet9

Fair Values of Assets and Liabilities - Differences Between Aggregate Fair Value, Carrying Amount of MLHFS and Aggregate Unpaid Principal Amount (Details) (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Fair Value Disclosures [Abstract]	'	'
Fair value carrying amount, total loans	$3,844	$7,957
Fair value carrying amount, nonaccrual loans	10	8
Fair value carrying amount, loans 90 days or more past due	1	2
Aggregate unpaid principal, total loans	3,693	7,588
Aggregate unpaid principal, nonaccrual loans	15	13
Aggregate unpaid principal, loans 90 days or more past due	1	3
Carrying amount over (under) unpaid principal, total loans	151	369
Carrying amount over (under) unpaid principal, nonaccrual loans	-5	-5
Carrying amount over (under) unpaid principal, loans 90 days or more past due	'	($1)

Recovered_Sheet10

Fair Values of Assets and Liabilities - Estimated Fair Values of Financial Instruments (Detail) (USD $)	Sep. 30, 2013		Dec. 31, 2012		Sep. 30, 2012	Dec. 31, 2011
In Millions, unless otherwise specified
Financial Assets	'		'		'	'
Cash and due from banks	$11,615		$8,252		$9,382	$13,962
Investment securities held-to-maturity	36,904	[1]	34,389	[1]	'	'
Financial Liabilities	'		'		'	'
Deposits	261,716		249,183		'	'
Long-term debt	18,750		25,516		'	'
Carrying Amount [Member]	'		'		'	'
Financial Assets	'		'		'	'
Cash and due from banks	11,615		8,252		'	'
Federal funds sold and securities purchased under resale agreements	259		437		'	'
Investment securities held-to-maturity	36,904		34,389		'	'
Loans held for sale	14		19		'	'
Loans	227,027		218,765		'	'
Other financial instruments	2,149		7,367		'	'
Financial Liabilities	'		'		'	'
Deposits	261,716		249,183		'	'
Short-term borrowings	25,364		25,901		'	'
Long-term debt	18,750		25,516		'	'
Fair Value [Member]	'		'		'	'
Financial Assets	'		'		'	'
Cash and due from banks	11,615		8,252		'	'
Federal funds sold and securities purchased under resale agreements	259		437		'	'
Investment securities held-to-maturity	36,632		34,952		'	'
Loans held for sale	14		19		'	'
Loans	228,087		220,354		'	'
Other financial instruments	2,166		7,385		'	'
Financial Liabilities	'		'		'	'
Deposits	261,792		249,594		'	'
Short-term borrowings	25,307		25,917		'	'
Long-term debt	19,216		26,205		'	'
Fair Value [Member] | Level 1 [Member]	'		'		'	'
Financial Assets	'		'		'	'
Cash and due from banks	11,615		8,252		'	'
Federal funds sold and securities purchased under resale agreements	'		'		'	'
Investment securities held-to-maturity	2,912		2,984		'	'
Loans held for sale	'		'		'	'
Loans	'		'		'	'
Other financial instruments	'		'		'	'
Financial Liabilities	'		'		'	'
Deposits	'		'		'	'
Short-term borrowings	'		'		'	'
Long-term debt	'		'		'	'
Fair Value [Member] | Level 2 [Member]	'		'		'	'
Financial Assets	'		'		'	'
Cash and due from banks	'		'		'	'
Federal funds sold and securities purchased under resale agreements	259		437		'	'
Investment securities held-to-maturity	33,611		31,845		'	'
Loans held for sale	'		'		'	'
Loans	'		'		'	'
Other financial instruments	1,166		1,228		'	'
Financial Liabilities	'		'		'	'
Deposits	261,792		249,594		'	'
Short-term borrowings	25,307		25,917		'	'
Long-term debt	19,216		26,205		'	'
Fair Value [Member] | Level 3 [Member]	'		'		'	'
Financial Assets	'		'		'	'
Cash and due from banks	'		'		'	'
Federal funds sold and securities purchased under resale agreements	'		'		'	'
Investment securities held-to-maturity	109		123		'	'
Loans held for sale	14		19		'	'
Loans	228,087		220,354		'	'
Other financial instruments	1,000		6,157		'	'
Financial Liabilities	'		'		'	'
Deposits	'		'		'	'
Short-term borrowings	'		'		'	'
Long-term debt	'		'		'	'
[1]	Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

Guarantees_and_Contingent_Liab2

Guarantees and Contingent Liabilities - Additional Information (Detail) (USD $)	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
Guarantees And Contingent Liabilities (Textual) [Abstract]	'	'	'	'	'	'
Liability related to remaining Visa Litigation, carrying amount	$59,000,000	'	'	'	'	'
Value of airline tickets purchased to deliver at a future date	6,200,000,000	'	'	'	'	'
Company held collateral in escrow deposits, letters of credit and indemnities from financial institutions, and liens on various assets	687,000,000	'	'	'	'	'
Representation and warranty reserve	176,000,000	190,000,000	240,000,000	220,000,000	216,000,000	160,000,000
Unresolved representation and warranty claims	114,000,000	'	131,000,000	'	'	'
Loss contingency range of possible loss maximum	$200,000,000	'	'	'	'	'

Guarantees_and_Contingent_Liab3

Guarantees and Contingent Liabilities - Summary of Other Guarantees and Contingent Liabilities (Detail) (USD $)	Sep. 30, 2013
In Millions, unless otherwise specified
Standby Letters of Credit [Member]	'
Guarantor Obligations [Line Items]	'
Collateral Held	'
Carrying Amount	71
Maximum Potential Future Payments	17,339
Third-Party Borrowing Arrangements [Member]	'
Guarantor Obligations [Line Items]	'
Collateral Held	'
Carrying Amount	'
Maximum Potential Future Payments	17
Securities Lending Indemnifications [Member]	'
Guarantor Obligations [Line Items]	'
Collateral Held	5,494
Carrying Amount	'
Maximum Potential Future Payments	5,326
Asset Sales [Member]	'
Guarantor Obligations [Line Items]	'
Collateral Held	'
Carrying Amount	267
Maximum Potential Future Payments	3,250
Merchant Processing [Member]	'
Guarantor Obligations [Line Items]	'
Collateral Held	840
Carrying Amount	69
Maximum Potential Future Payments	86,584
Contingent Consideration Arrangements [Member]	'
Guarantor Obligations [Line Items]	'
Collateral Held	'
Carrying Amount	14
Maximum Potential Future Payments	17
Tender Option Bond Program Guarantee [Member]	'
Guarantor Obligations [Line Items]	'
Collateral Held	4,762
Carrying Amount	'
Maximum Potential Future Payments	4,711
Minimum Revenue Guarantees [Member]	'
Guarantor Obligations [Line Items]	'
Collateral Held	'
Carrying Amount	12
Maximum Potential Future Payments	12
Other [Member]	'
Guarantor Obligations [Line Items]	'
Collateral Held	'
Carrying Amount	6
Maximum Potential Future Payments	$553

Guarantees_and_Contingent_Liab4

Guarantees and Contingent Liabilities - Company's Representation and Warranty Reserve (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Valuation And Qualifying Accounts [Abstract]	'	'	'	'
Representation and Warranty Reserve, Beginning Balance	$190	$216	$240	$160
Net realized losses	-13	-32	-52	-88
Change in reserve	-1	36	-12	148
Representation and Warranty Reserve, Ending Balance	$176	$220	$176	$220