Derivatives (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Total Notional or Contractual Amounts and Fair Values for Derivatives [Abstract]
Fair Value Asset derivatives, net	$ 22,765,000,000		$ 22,765,000,000		$ 21,889,000,000
Fair Value Liability derivatives, net	11,360,000,000		11,360,000,000		10,884,000,000
Net Gains Losses Recognized In Income Statement Related To Derivatives In Fair Value Hedging Relationships [Abstract]
Gains (losses) recorded in net interest income	432,000,000	519,000,000	829,000,000	1,052,000,000
Gains (losses) recorded in noninterest income Recognized on derivatives	982,000,000	(597,000,000)	1,621,000,000	(1,208,000,000)
Gains (losses) recorded in noninterest income Recognized on hedged item	(960,000,000)	732,000,000	(1,725,000,000)	1,385,000,000
Gains (losses) recorded in noninterest income Recognized on fair value hedges (ineffective portion)	22,000,000	135,000,000	(104,000,000)	177,000,000
Net Gains Losses Recognized Related to Derivatives in Cash Flow Hedging Relationships [Abstract]
Gains (losses) (after tax) recognized in OCI on derivatives (effective portion)	(84,000,000)	190,000,000	(83,000,000)	349,000,000
Gains (pre tax) reclassified from cumulative OCI into net interest income (effective portion)	157,000,000	186,000,000	313,000,000	328,000,000
Gains (losses) (pre tax) recognized in noninterest income on derivatives (ineffective portion)	0	(1,000,000)	(2,000,000)	6,000,000
Net Gains (Losses) Recognized in the Income Statement Related to Derivatives not Designated as Hedging Instruments [Abstract]
Net gains recognized related to derivatives not designated as hedging instruments	1,870,000,000	2,836,000,000	2,226,000,000	4,362,000,000
Details of Sold and Purchased Credit Derivatives [Abstract]
Fair value liability	5,257,000,000		5,257,000,000		5,826,000,000
Notional amount Protection sold	44,536,000,000		44,536,000,000		47,699,000,000
Notional amount Protection sold non investment grade	28,087,000,000		28,087,000,000		29,075,000,000
Notional amount Protection purchased with identical underlyings	24,238,000,000		24,238,000,000		26,495,000,000
Notional Net protection sold	20,298,000,000		20,298,000,000		21,204,000,000
Notional Other protection purchased	18,125,000,000		18,125,000,000		16,955,000,000
Derivatives (Textual) [Abstract]
Notional Basis swaps combined with receive fixed rate/pay floating rate swaps	20,100,000,000		20,100,000,000		20,900,000,000
Cash collateral netted against derivative assets	6,100,000,000		6,100,000,000		5,500,000,000
Cash collateral netted against derivative liabilities	12,600,000,000		12,600,000,000		12,100,000,000
Gains (losses) on forward derivatives hedging	22,000,000	0	30,000,000	1,000,000
Deferred net gains on derivatives in other comprehensive income	323,000,000				367,000,000
Maximum length of time hedged in cash flow hedge	7 years
Losses/gains on derivatives used to hedge residential mortgage servicing rights	1,449,000,000	3,287,000,000	1,329,000,000	5,053,000,000
Aggregate fair value of derivatives used for economic hedges net asset liability	359,000,000		359,000,000		(943,000,000)
Aggregate fair value of derivative loan commitments net asset liability	(48,000,000)		(48,000,000)		(271,000,000)
Aggregate fair value of derivative instruments with credit-risk-related contingent features, net liability	13,900,000,000		13,900,000,000		12,600,000,000
Collateral for derivative instruments with credit-risk-related contingent features	12,800,000,000		12,800,000,000		12,000,000,000
Additional collateral for derivative instruments with credit-risk-related contingent features	1,500,000,000		1,500,000,000		1,000,000,000
Commercial [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Fair value liability	641,000,000		641,000,000		717,000,000
Notional amount Protection sold	1,564,000,000		1,564,000,000		1,977,000,000
Notional amount Protection sold non investment grade	499,000,000		499,000,000		612,000,000
Notional amount Protection purchased with identical underlyings	750,000,000		750,000,000		924,000,000
Notional Net protection sold	814,000,000		814,000,000		1,053,000,000
Notional Other protection purchased	678,000,000		678,000,000		779,000,000
Range of maturities, from	2049		2049		2049
Range of maturities, to	2052		2052		2052
Derivatives [Member]
Total Notional or Contractual Amounts and Fair Values for Derivatives [Abstract]
Fair Value Asset derivatives	81,326,000,000		81,326,000,000		85,358,000,000
Fair Value Liability derivatives	76,442,000,000		76,442,000,000		80,893,000,000
Long-term debt [Member] | Foreign Exchange Contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives In Fair Value Hedging Relationships [Abstract]
Gains (losses) recorded in net interest income	105,000,000	87,000,000	195,000,000	184,000,000
Gains (losses) recorded in noninterest income Recognized on derivatives	515,000,000	(1,769,000,000)	1,595,000,000	(2,905,000,000)
Gains (losses) recorded in noninterest income Recognized on hedged item	(512,000,000)	1,778,000,000	(1,629,000,000)	2,932,000,000
Gains (losses) recorded in noninterest income Recognized on fair value hedges (ineffective portion)	3,000,000	9,000,000	(34,000,000)	27,000,000
Long-term debt [Member] | Interest Rate Contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives In Fair Value Hedging Relationships [Abstract]
Gains (losses) recorded in net interest income	437,000,000	527,000,000	851,000,000	1,058,000,000
Gains (losses) recorded in noninterest income Recognized on derivatives	736,000,000	1,744,000,000	91,000,000	2,276,000,000
Gains (losses) recorded in noninterest income Recognized on hedged item	(709,000,000)	(1,626,000,000)	(87,000,000)	(2,143,000,000)
Gains (losses) recorded in noninterest income Recognized on fair value hedges (ineffective portion)	27,000,000	118,000,000	4,000,000	133,000,000
Netting of derivative asset and liability balances and related cash collateral [Member]
Total Notional or Contractual Amounts and Fair Values for Derivatives [Abstract]
Fair Value Asset derivatives, netting	(58,561,000,000)		(58,561,000,000)		(63,469,000,000)
Fair Value Liability derivatives, netting	(65,082,000,000)		(65,082,000,000)		(70,009,000,000)
Loan deliverable credit default swaps [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Fair value liability	1,000,000		1,000,000		2,000,000
Notional amount Protection sold	491,000,000		491,000,000		481,000,000
Notional amount Protection sold non investment grade	467,000,000		467,000,000		456,000,000
Notional amount Protection purchased with identical underlyings	379,000,000		379,000,000		391,000,000
Notional Net protection sold	112,000,000		112,000,000		90,000,000
Notional Other protection purchased	266,000,000		266,000,000		261,000,000
Range of maturities, from	2012		2012		2011
Range of maturities, to	2016		2016		2014
Other [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Fair value liability	9,000,000		9,000,000		12,000,000
Notional amount Protection sold	4,707,000,000		4,707,000,000		6,127,000,000
Notional amount Protection sold non investment grade	4,412,000,000		4,412,000,000		5,348,000,000
Notional amount Protection purchased with identical underlyings	134,000,000		134,000,000		41,000,000
Notional Net protection sold	4,573,000,000		4,573,000,000		6,086,000,000
Notional Other protection purchased	3,328,000,000		3,328,000,000		2,745,000,000
Range of maturities, from	2011		2011		2011
Range of maturities, to	2056		2056		2056
Designated as Hedging Instrument [Member]
Total Notional or Contractual Amounts and Fair Values for Derivatives [Abstract]
Fair Value Asset derivatives	8,434,000,000		8,434,000,000		8,653,000,000
Fair Value Liability derivatives	2,101,000,000		2,101,000,000		2,341,000,000
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Total Notional or Contractual Amounts and Fair Values for Derivatives [Abstract]
Qualifying Hedge Contracts	25,437,000,000		25,437,000,000		25,904,000,000
Fair Value Asset derivatives	1,939,000,000		1,939,000,000		1,527,000,000
Fair Value Liability derivatives	545,000,000		545,000,000		727,000,000
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
Total Notional or Contractual Amounts and Fair Values for Derivatives [Abstract]
Qualifying Hedge Contracts	96,071,000,000		96,071,000,000		110,314,000,000
Fair Value Asset derivatives	6,495,000,000		6,495,000,000		7,126,000,000
Fair Value Liability derivatives	1,556,000,000		1,556,000,000		1,614,000,000
Not Designated as Hedging Instrument [Member]
Total Notional or Contractual Amounts and Fair Values for Derivatives [Abstract]
Fair Value Asset derivatives	72,892,000,000		72,892,000,000		76,705,000,000
Fair Value Liability derivatives	74,341,000,000		74,341,000,000		78,552,000,000
Not Designated as Hedging Instrument [Member] | Free standing derivatives (economic hedges) [Member]
Total Notional or Contractual Amounts and Fair Values for Derivatives [Abstract]
Fair Value Asset derivatives	1,116,000,000		1,116,000,000		3,001,000,000
Fair Value Liability derivatives	1,167,000,000		1,167,000,000		2,759,000,000
Not Designated as Hedging Instrument [Member] | Free standing derivatives (economic hedges) [Member] | Credit Contracts Protection Purchased [Member]
Total Notional or Contractual Amounts and Fair Values for Derivatives [Abstract]
Fair Value Asset derivatives	4,000,000		4,000,000		80,000,000
Fair Value Liability derivatives	0		0		0
Derivatives not designated as hedging instruments	145,000,000		145,000,000		396,000,000
Not Designated as Hedging Instrument [Member] | Free standing derivatives (economic hedges) [Member] | Foreign Exchange Contract [Member]
Total Notional or Contractual Amounts and Fair Values for Derivatives [Abstract]
Fair Value Asset derivatives	35,000,000		35,000,000		23,000,000
Fair Value Liability derivatives	83,000,000		83,000,000		53,000,000
Derivatives not designated as hedging instruments	6,045,000,000		6,045,000,000		5,528,000,000
Not Designated as Hedging Instrument [Member] | Free standing derivatives (economic hedges) [Member] | Interest Rate Contract [Member]
Total Notional or Contractual Amounts and Fair Values for Derivatives [Abstract]
Fair Value Asset derivatives	1,076,000,000		1,076,000,000		2,898,000,000
Fair Value Liability derivatives	1,050,000,000		1,050,000,000		2,625,000,000
Derivatives not designated as hedging instruments	292,787,000,000		292,787,000,000		408,563,000,000
Not Designated as Hedging Instrument [Member] | Free standing derivatives (economic hedges) [Member] | Equity Contract [Member]
Total Notional or Contractual Amounts and Fair Values for Derivatives [Abstract]
Fair Value Asset derivatives	0		0		0
Fair Value Liability derivatives	0		0		46,000,000
Derivatives not designated as hedging instruments	0		0		176,000,000
Not Designated as Hedging Instrument [Member] | Free standing derivatives (economic hedges) [Member] | Other Contract [Member]
Total Notional or Contractual Amounts and Fair Values for Derivatives [Abstract]
Fair Value Asset derivatives	1,000,000		1,000,000		0
Fair Value Liability derivatives	34,000,000		34,000,000		35,000,000
Derivatives not designated as hedging instruments	2,524,000,000		2,524,000,000		2,538,000,000
Not Designated as Hedging Instrument [Member] | Customer accommodation trading and other free standing derivatives [Member]
Total Notional or Contractual Amounts and Fair Values for Derivatives [Abstract]
Fair Value Asset derivatives	71,776,000,000		71,776,000,000		73,704,000,000
Fair Value Liability derivatives	73,174,000,000		73,174,000,000		75,793,000,000
Not Designated as Hedging Instrument [Member] | Customer accommodation trading and other free standing derivatives [Member] | Credit Contracts Protection Purchased [Member]
Total Notional or Contractual Amounts and Fair Values for Derivatives [Abstract]
Fair Value Asset derivatives	4,074,000,000		4,074,000,000		4,661,000,000
Fair Value Liability derivatives	526,000,000		526,000,000		588,000,000
Derivatives not designated as hedging instruments	42,371,000,000		42,371,000,000		44,776,000,000
Not Designated as Hedging Instrument [Member] | Customer accommodation trading and other free standing derivatives [Member] | Credit Contracts Protection Sold [Member]
Total Notional or Contractual Amounts and Fair Values for Derivatives [Abstract]
Fair Value Asset derivatives	569,000,000		569,000,000		605,000,000
Fair Value Liability derivatives	5,257,000,000		5,257,000,000		5,826,000,000
Derivatives not designated as hedging instruments	44,536,000,000		44,536,000,000		47,699,000,000
Not Designated as Hedging Instrument [Member] | Customer accommodation trading and other free standing derivatives [Member] | Foreign Exchange Contract [Member]
Total Notional or Contractual Amounts and Fair Values for Derivatives [Abstract]
Fair Value Asset derivatives	3,035,000,000		3,035,000,000		2,800,000,000
Fair Value Liability derivatives	2,596,000,000		2,596,000,000		2,682,000,000
Derivatives not designated as hedging instruments	146,093,000,000		146,093,000,000		110,889,000,000
Not Designated as Hedging Instrument [Member] | Customer accommodation trading and other free standing derivatives [Member] | Interest Rate Contract [Member]
Total Notional or Contractual Amounts and Fair Values for Derivatives [Abstract]
Fair Value Asset derivatives	55,599,000,000		55,599,000,000		58,225,000,000
Fair Value Liability derivatives	56,975,000,000		56,975,000,000		59,329,000,000
Derivatives not designated as hedging instruments	2,859,012,000,000		2,859,012,000,000		2,809,387,000,000
Not Designated as Hedging Instrument [Member] | Customer accommodation trading and other free standing derivatives [Member] | Equity Contract [Member]
Total Notional or Contractual Amounts and Fair Values for Derivatives [Abstract]
Fair Value Asset derivatives	3,691,000,000		3,691,000,000		3,272,000,000
Fair Value Liability derivatives	3,846,000,000		3,846,000,000		3,450,000,000
Derivatives not designated as hedging instruments	71,179,000,000		71,179,000,000		73,278,000,000
Not Designated as Hedging Instrument [Member] | Customer accommodation trading and other free standing derivatives [Member] | Commodity Contract [Member]
Total Notional or Contractual Amounts and Fair Values for Derivatives [Abstract]
Fair Value Asset derivatives	4,808,000,000		4,808,000,000		4,133,000,000
Fair Value Liability derivatives	3,974,000,000		3,974,000,000		3,918,000,000
Derivatives not designated as hedging instruments	91,410,000,000		91,410,000,000		83,114,000,000
Not Designated as Hedging Instrument [Member] | Customer accommodation trading and other free standing derivatives [Member] | Other Contract [Member]
Total Notional or Contractual Amounts and Fair Values for Derivatives [Abstract]
Fair Value Asset derivatives	0		0		8,000,000
Fair Value Liability derivatives	0		0		0
Derivatives not designated as hedging instruments	0		0		190,000,000
Structured products [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Fair value liability	3,826,000,000		3,826,000,000		4,145,000,000
Notional amount Protection sold	5,499,000,000		5,499,000,000		5,825,000,000
Notional amount Protection sold non investment grade	5,015,000,000		5,015,000,000		5,246,000,000
Notional amount Protection purchased with identical underlyings	4,765,000,000		4,765,000,000		4,948,000,000
Notional Net protection sold	734,000,000		734,000,000		877,000,000
Notional Other protection purchased	2,383,000,000		2,383,000,000		2,482,000,000
Range of maturities, from	2016		2016		2016
Range of maturities, to	2056		2056		2056
Credit Default Swap [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Fair value liability	15,000,000		15,000,000		12,000,000
Notional amount Protection sold	3,440,000,000		3,440,000,000		2,700,000,000
Notional amount Protection sold non investment grade	1,094,000,000		1,094,000,000		909,000,000
Notional amount Protection purchased with identical underlyings	2,425,000,000		2,425,000,000		2,167,000,000
Notional Net protection sold	1,015,000,000		1,015,000,000		533,000,000
Notional Other protection purchased	1,146,000,000		1,146,000,000		1,106,000,000
Range of maturities, from	2011		2011		2011
Range of maturities, to	2017		2017		2017
Corporate Bond Securities [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Fair value liability	676,000,000		676,000,000		810,000,000
Notional amount Protection sold	28,736,000,000		28,736,000,000		30,445,000,000
Notional amount Protection sold non investment grade	16,501,000,000		16,501,000,000		16,360,000,000
Notional amount Protection purchased with identical underlyings	15,775,000,000		15,775,000,000		17,978,000,000
Notional Net protection sold	12,961,000,000		12,961,000,000		12,467,000,000
Notional Other protection purchased	10,194,000,000		10,194,000,000		9,440,000,000
Range of maturities, from	2011		2011		2011
Range of maturities, to	2021		2021		2020
Total asset-backed securities [Member]
Details of Sold and Purchased Credit Derivatives [Abstract]
Fair value liability	89,000,000		89,000,000		128,000,000
Notional amount Protection sold	99,000,000		99,000,000		144,000,000
Notional amount Protection sold non investment grade	99,000,000		99,000,000		144,000,000
Notional amount Protection purchased with identical underlyings	10,000,000		10,000,000		46,000,000
Notional Net protection sold	89,000,000		89,000,000		98,000,000
Notional Other protection purchased	130,000,000		130,000,000		142,000,000
Range of maturities, from	2037		2037		2037
Range of maturities, to	2046		2046		2046
Free standing derivatives (economic hedges) [Member]
Net Gains (Losses) Recognized in the Income Statement Related to Derivatives not Designated as Hedging Instruments [Abstract]
Gain (Loss) on Derivative Instruments	54,000,000	760,000,000	(151,000,000)	1,409,000,000
Free standing derivatives (economic hedges) [Member] | Interest Rate Contracts Recognized In Noninterest Income Other [Member]
Net Gains (Losses) Recognized in the Income Statement Related to Derivatives not Designated as Hedging Instruments [Abstract]
Gain (Loss) on Derivative Instruments	(31,000,000)	(30,000,000)	(20,000,000)	(36,000,000)
Free standing derivatives (economic hedges) [Member] | Interest Rate Contracts Recognized In Noninterest Income Mortgage Banking [Member]
Net Gains (Losses) Recognized in the Income Statement Related to Derivatives not Designated as Hedging Instruments [Abstract]
Gain (Loss) on Derivative Instruments	198,000,000	757,000,000	251,000,000	1,425,000,000
Free standing derivatives (economic hedges) [Member] | Foreign Exchange Contract [Member]
Net Gains (Losses) Recognized in the Income Statement Related to Derivatives not Designated as Hedging Instruments [Abstract]
Gain (Loss) on Derivative Instruments	(105,000,000)	69,000,000	(369,000,000)	145,000,000
Free standing derivatives (economic hedges) [Member] | Equity Contract [Member]
Net Gains (Losses) Recognized in the Income Statement Related to Derivatives not Designated as Hedging Instruments [Abstract]
Gain (Loss) on Derivative Instruments	(5,000,000)		(5,000,000)
Free standing derivatives (economic hedges) [Member] | Credit Contract [Member]
Net Gains (Losses) Recognized in the Income Statement Related to Derivatives not Designated as Hedging Instruments [Abstract]
Gain (Loss) on Derivative Instruments	(3,000,000)	(36,000,000)	(8,000,000)	(125,000,000)
Customer accommodation trading and other free standing derivatives [Member]
Net Gains (Losses) Recognized in the Income Statement Related to Derivatives not Designated as Hedging Instruments [Abstract]
Gain (Loss) on Derivative Instruments	1,816,000,000	2,076,000,000	2,377,000,000	2,953,000,000
Customer accommodation trading and other free standing derivatives [Member] | Interest Rate Contracts Recognized In Noninterest Income Other [Member]
Net Gains (Losses) Recognized in the Income Statement Related to Derivatives not Designated as Hedging Instruments [Abstract]
Gain (Loss) on Derivative Instruments	94,000,000	(154,000,000)	290,000,000	165,000,000
Customer accommodation trading and other free standing derivatives [Member] | Interest Rate Contracts Recognized In Noninterest Income Mortgage Banking [Member]
Net Gains (Losses) Recognized in the Income Statement Related to Derivatives not Designated as Hedging Instruments [Abstract]
Gain (Loss) on Derivative Instruments	759,000,000	1,644,000,000	1,159,000,000	2,547,000,000
Customer accommodation trading and other free standing derivatives [Member] | Foreign Exchange Contract [Member]
Net Gains (Losses) Recognized in the Income Statement Related to Derivatives not Designated as Hedging Instruments [Abstract]
Gain (Loss) on Derivative Instruments	125,000,000	148,000,000	307,000,000	266,000,000
Customer accommodation trading and other free standing derivatives [Member] | Equity Contract [Member]
Net Gains (Losses) Recognized in the Income Statement Related to Derivatives not Designated as Hedging Instruments [Abstract]
Gain (Loss) on Derivative Instruments	639,000,000	495,000,000	477,000,000	449,000,000
Customer accommodation trading and other free standing derivatives [Member] | Commodity Contract [Member]
Net Gains (Losses) Recognized in the Income Statement Related to Derivatives not Designated as Hedging Instruments [Abstract]
Gain (Loss) on Derivative Instruments	116,000,000	13,000,000	101,000,000	33,000,000
Customer accommodation trading and other free standing derivatives [Member] | Credit Contract [Member]
Net Gains (Losses) Recognized in the Income Statement Related to Derivatives not Designated as Hedging Instruments [Abstract]
Gain (Loss) on Derivative Instruments	91,000,000	(58,000,000)	44,000,000	(488,000,000)
Customer accommodation trading and other free standing derivatives [Member] | Other Contract [Member]
Net Gains (Losses) Recognized in the Income Statement Related to Derivatives not Designated as Hedging Instruments [Abstract]
Gain (Loss) on Derivative Instruments	(8,000,000)	(12,000,000)	(1,000,000)	(19,000,000)
Available for sale Securities [Member] | Foreign Exchange Contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives In Fair Value Hedging Relationships [Abstract]
Gains (losses) recorded in net interest income	(3,000,000)	(1,000,000)	(4,000,000)	(2,000,000)
Gains (losses) recorded in noninterest income Recognized on derivatives	11,000,000	70,000,000	46,000,000	189,000,000
Gains (losses) recorded in noninterest income Recognized on hedged item	(18,000,000)	(70,000,000)	(51,000,000)	(189,000,000)
Gains (losses) recorded in noninterest income Recognized on fair value hedges (ineffective portion)	(7,000,000)	0	(5,000,000)	0
Available for sale Securities [Member] | Interest Rate Contract [Member]
Net Gains Losses Recognized In Income Statement Related To Derivatives In Fair Value Hedging Relationships [Abstract]
Gains (losses) recorded in net interest income	(107,000,000)	(94,000,000)	(213,000,000)	(188,000,000)
Gains (losses) recorded in noninterest income Recognized on derivatives	(280,000,000)	(642,000,000)	(111,000,000)	(768,000,000)
Gains (losses) recorded in noninterest income Recognized on hedged item	279,000,000	650,000,000	42,000,000	785,000,000
Gains (losses) recorded in noninterest income Recognized on fair value hedges (ineffective portion)	$ (1,000,000)	$ 8,000,000	$ (69,000,000)	$ 17,000,000