Off-Balance Sheet Lending-Related Financial Instruments, Guarantees and Other Commitments (Details) (USD $)																																																																																																																																		3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Mar. 31, 2013 Expires in one year or less	Mar. 31, 2013 Expires after one year through three years	Mar. 31, 2013 Expires after three years through five years	Mar. 31, 2013 Expires after five years	Mar. 31, 2013 Consumer Loan	Dec. 31, 2012 Consumer Loan	Mar. 31, 2013 Consumer Loan Expires in one year or less	Mar. 31, 2013 Consumer Loan Expires after one year through three years	Mar. 31, 2013 Consumer Loan Expires after three years through five years	Mar. 31, 2013 Consumer Loan Expires after five years	Mar. 31, 2013 Consumer Loan Excluding Credit Card	Dec. 31, 2012 Consumer Loan Excluding Credit Card	Mar. 31, 2013 Consumer Loan Excluding Credit Card Expires in one year or less	Mar. 31, 2013 Consumer Loan Excluding Credit Card Expires after one year through three years	Mar. 31, 2013 Consumer Loan Excluding Credit Card Expires after three years through five years	Mar. 31, 2013 Consumer Loan Excluding Credit Card Expires after five years	Mar. 31, 2013 Home Equity - Senior Lien	Dec. 31, 2012 Home Equity - Senior Lien	Mar. 31, 2013 Home Equity - Senior Lien Expires in one year or less	Mar. 31, 2013 Home Equity - Senior Lien Expires after one year through three years	Mar. 31, 2013 Home Equity - Senior Lien Expires after three years through five years	Mar. 31, 2013 Home Equity - Senior Lien Expires after five years	Mar. 31, 2013 Home Equity - Junior Lien	Dec. 31, 2012 Home Equity - Junior Lien	Mar. 31, 2013 Home Equity - Junior Lien Expires in one year or less	Mar. 31, 2013 Home Equity - Junior Lien Expires after one year through three years	Mar. 31, 2013 Home Equity - Junior Lien Expires after three years through five years	Mar. 31, 2013 Home Equity - Junior Lien Expires after five years	Mar. 31, 2013 Prime Mortgages, Including Option ARMs	Dec. 31, 2012 Prime Mortgages, Including Option ARMs	Mar. 31, 2013 Prime Mortgages, Including Option ARMs Expires in one year or less	Mar. 31, 2013 Prime Mortgages, Including Option ARMs Expires after one year through three years	Mar. 31, 2013 Prime Mortgages, Including Option ARMs Expires after three years through five years	Mar. 31, 2013 Prime Mortgages, Including Option ARMs Expires after five years	Mar. 31, 2013 Subprime Mortgages	Dec. 31, 2012 Subprime Mortgages	Mar. 31, 2013 Subprime Mortgages Expires in one year or less	Mar. 31, 2013 Subprime Mortgages Expires after one year through three years	Mar. 31, 2013 Subprime Mortgages Expires after three years through five years	Mar. 31, 2013 Subprime Mortgages Expires after five years	Mar. 31, 2013 Auto Loans	Dec. 31, 2012 Auto Loans	Mar. 31, 2013 Auto Loans Expires in one year or less	Mar. 31, 2013 Auto Loans Expires after one year through three years	Mar. 31, 2013 Auto Loans Expires after three years through five years	Mar. 31, 2013 Auto Loans Expires after five years	Mar. 31, 2013 Business Banking Loans	Dec. 31, 2012 Business Banking Loans	Mar. 31, 2013 Business Banking Loans Expires in one year or less	Mar. 31, 2013 Business Banking Loans Expires after one year through three years	Mar. 31, 2013 Business Banking Loans Expires after three years through five years	Mar. 31, 2013 Business Banking Loans Expires after five years	Mar. 31, 2013 Student and Other Loans	Dec. 31, 2012 Student and Other Loans	Mar. 31, 2013 Student and Other Loans Expires in one year or less	Mar. 31, 2013 Student and Other Loans Expires after one year through three years	Mar. 31, 2013 Student and Other Loans Expires after three years through five years	Mar. 31, 2013 Student and Other Loans Expires after five years	Mar. 31, 2013 Credit Card Loan	Dec. 31, 2012 Credit Card Loan	Mar. 31, 2013 Credit Card Loan Expires in one year or less	Mar. 31, 2013 Credit Card Loan Expires after one year through three years	Mar. 31, 2013 Credit Card Loan Expires after three years through five years	Mar. 31, 2013 Credit Card Loan Expires after five years	Mar. 31, 2013 Wholesale Loan [Member]	Dec. 31, 2012 Wholesale Loan [Member]	Mar. 31, 2013 Wholesale Loan [Member] Expires in one year or less	Mar. 31, 2013 Wholesale Loan [Member] Expires after one year through three years	Mar. 31, 2013 Wholesale Loan [Member] Expires after three years through five years	Mar. 31, 2013 Wholesale Loan [Member] Expires after five years	Mar. 31, 2013 Other Unfunded Commitments to Extend Credit	Dec. 31, 2012 Other Unfunded Commitments to Extend Credit	Mar. 31, 2013 Other Unfunded Commitments to Extend Credit Expires in one year or less	Mar. 31, 2013 Other Unfunded Commitments to Extend Credit Expires after one year through three years	Mar. 31, 2013 Other Unfunded Commitments to Extend Credit Expires after three years through five years	Mar. 31, 2013 Other Unfunded Commitments to Extend Credit Expires after five years	Mar. 31, 2013 Standby Letters of Credit, and Other Financial Guarantees	Dec. 31, 2012 Standby Letters of Credit, and Other Financial Guarantees	Mar. 31, 2013 Standby Letters of Credit, and Other Financial Guarantees Expires in one year or less	Mar. 31, 2013 Standby Letters of Credit, and Other Financial Guarantees Expires after one year through three years	Mar. 31, 2013 Standby Letters of Credit, and Other Financial Guarantees Expires after three years through five years	Mar. 31, 2013 Standby Letters of Credit, and Other Financial Guarantees Expires after five years	Mar. 31, 2013 Unused Advised Lines of Credit	Dec. 31, 2012 Unused Advised Lines of Credit	Mar. 31, 2013 Unused Advised Lines of Credit Expires in one year or less	Mar. 31, 2013 Unused Advised Lines of Credit Expires after one year through three years	Mar. 31, 2013 Unused Advised Lines of Credit Expires after three years through five years	Mar. 31, 2013 Unused Advised Lines of Credit Expires after five years	Mar. 31, 2013 Other Letters of Credit	Dec. 31, 2012 Other Letters of Credit	Mar. 31, 2013 Other Letters of Credit Expires in one year or less	Mar. 31, 2013 Other Letters of Credit Expires after one year through three years	Mar. 31, 2013 Other Letters of Credit Expires after three years through five years	Mar. 31, 2013 Other Letters of Credit Expires after five years	Mar. 31, 2013 Securities Lending Indemnifications	Dec. 31, 2012 Securities Lending Indemnifications	Mar. 31, 2013 Securities Lending Indemnifications Expires in one year or less	Mar. 31, 2013 Securities Lending Indemnifications Expires after one year through three years	Mar. 31, 2013 Securities Lending Indemnifications Expires after three years through five years	Mar. 31, 2013 Securities Lending Indemnifications Expires after five years	Mar. 31, 2013 Derivatives Qualifying as Guarantees	Dec. 31, 2012 Derivatives Qualifying as Guarantees	Mar. 31, 2013 Derivatives Qualifying as Guarantees Expires in one year or less	Mar. 31, 2013 Derivatives Qualifying as Guarantees Expires after one year through three years	Mar. 31, 2013 Derivatives Qualifying as Guarantees Expires after three years through five years	Mar. 31, 2013 Derivatives Qualifying as Guarantees Expires after five years	Mar. 31, 2013 Unsettled Reverse Repurchase and Securities Borrowing Agreements	Dec. 31, 2012 Unsettled Reverse Repurchase and Securities Borrowing Agreements	Mar. 31, 2013 Unsettled Reverse Repurchase and Securities Borrowing Agreements Expires in one year or less	Mar. 31, 2013 Unsettled Reverse Repurchase and Securities Borrowing Agreements Expires after one year through three years	Mar. 31, 2013 Unsettled Reverse Repurchase and Securities Borrowing Agreements Expires after three years through five years	Mar. 31, 2013 Unsettled Reverse Repurchase and Securities Borrowing Agreements Expires after five years	Mar. 31, 2013 Mortgage Repurchase Liability	Dec. 31, 2012 Mortgage Repurchase Liability	Mar. 31, 2012 Mortgage Repurchase Liability	Dec. 31, 2011 Mortgage Repurchase Liability	Mar. 31, 2013 Loans Sold With Recourse	Dec. 31, 2012 Loans Sold With Recourse	Mar. 31, 2013 Other Guarantees and Commitments	Dec. 31, 2012 Other Guarantees and Commitments	Mar. 31, 2013 Other Guarantees and Commitments Expires in one year or less	Mar. 31, 2013 Other Guarantees and Commitments Expires after one year through three years	Mar. 31, 2013 Other Guarantees and Commitments Expires after three years through five years	Mar. 31, 2013 Other Guarantees and Commitments Expires after five years	Mar. 31, 2013 Letters of Credit Hedged by Derivative Transactions	Dec. 31, 2012 Letters of Credit Hedged by Derivative Transactions	Mar. 31, 2013 Days Past Due, 60 or More Credit Card Loan Lending-Related Commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information
Line of Credit Close Criteria, Period Past Due																																																																																																																																		60 days
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	$ 1,033,610,000,000	$ 1,027,988,000,000	$ 997,503,000,000	$ 734,275,000,000	$ 137,650,000,000	$ 146,814,000,000	$ 14,871,000,000	$ 598,329,000,000	$ 593,174,000,000	$ 566,765,000,000	$ 13,722,000,000	$ 11,191,000,000	$ 6,651,000,000	$ 60,874,000,000	$ 60,156,000,000	$ 29,310,000,000	$ 13,722,000,000	$ 11,191,000,000	$ 6,651,000,000	$ 14,775,000,000	$ 15,180,000,000	$ 2,240,000,000	$ 4,911,000,000	$ 4,820,000,000	$ 2,804,000,000	$ 20,892,000,000	$ 21,796,000,000	$ 3,876,000,000	$ 7,933,000,000	$ 6,110,000,000	$ 2,973,000,000	$ 5,760,000,000	$ 4,107,000,000	$ 5,760,000,000	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 7,653,000,000	$ 7,185,000,000	$ 7,317,000,000	$ 137,000,000	$ 154,000,000	$ 45,000,000	$ 11,048,000,000	$ 11,092,000,000	$ 10,009,000,000	$ 583,000,000	$ 100,000,000	$ 356,000,000	$ 746,000,000	$ 796,000,000	$ 108,000,000	$ 158,000,000	$ 7,000,000	$ 473,000,000	$ 537,455,000,000	$ 533,018,000,000	$ 537,455,000,000	$ 0	$ 0	$ 0	$ 435,281,000,000	$ 434,814,000,000	$ 167,510,000,000	$ 123,928,000,000	$ 135,623,000,000	$ 8,220,000,000	$ 239,688,000,000	$ 243,225,000,000	$ 57,173,000,000	$ 79,704,000,000	$ 96,724,000,000	$ 6,087,000,000	$ 98,199,000,000	$ 100,929,000,000	$ 27,229,000,000	$ 31,513,000,000	$ 37,798,000,000	$ 1,659,000,000	$ 91,449,000,000	$ 85,087,000,000	$ 78,932,000,000	$ 11,304,000,000	$ 792,000,000	$ 421,000,000	$ 5,945,000,000	$ 5,573,000,000	$ 4,176,000,000	$ 1,407,000,000	$ 309,000,000	$ 53,000,000
Off Balance Sheet Lending Related Financial Instruments Carrying Value	1,078,000,000	1,033,000,000						7,000,000	7,000,000					7,000,000	7,000,000					0	0					0	0					0	0					0	0					1,000,000	1,000,000					6,000,000	6,000,000					0	0					0	0					1,071,000,000	1,026,000,000					431,000,000	377,000,000					638,000,000	647,000,000					0	0					2,000,000	2,000,000
Guarantor Obligations, Maximum Exposure, Undiscounted																																																																																																		182,526,000,000	166,493,000,000	182,526,000,000	0	0	0	59,259,000,000	61,738,000,000	2,217,000,000	1,419,000,000	18,452,000,000	37,171,000,000	52,209,000,000	34,871,000,000	52,209,000,000	0	0	0					9,022,000,000	9,305,000,000	6,646,000,000	6,780,000,000	548,000,000	345,000,000	1,431,000,000	4,322,000,000	4,600,000,000	4,500,000,000
Allowance for lending-related commitments																																																																																276,000,000	282,000,000											2,000,000	2,000,000																							2,674,000,000	2,811,000,000	3,516,000,000	3,557,000,000	139,000,000	141,000,000
Guarantor Obligations, Current Carrying Value																																																																																																								64,000,000	42,000,000																	(73,000,000)	(75,000,000)
Guarantor Obligations and Commitments, Current Carrying Value																																																																																																														0	0
Off balance sheet lending related financial instruments guarantees and other commitments - supplemental information [Abstract]
Off Balance Sheet Lending Related Commitments Wholesale Contractual Amount Net Of Risk Participations Other Unfunded Commitments To Extend Credit																																																																										428,000,000	473,000,000
Off balance sheet Lending related commitments Wholesale Contractual amount Net of Risk Participations Standby letters of credit and other financial guarantees																																																																																16,600,000,000	16,600,000,000
Off balance sheet Lending related commitments Wholesale Contractual amount Net of Risk Participations Other letters of credit																																																																																												1,100,000,000	690,000,000
Credit Enhancements and Bond and Commercial Paper Liquidity Commitments to US States and Municipalities Hospitals and Other Not For Profit Entities																																																																																43,200,000,000	44,500,000,000
Standby Letters of Credit, Unissued Commitments	42,200,000,000	44,400,000,000
Indemnification Agreement Securities Lending Guarantees Collateral Held In Support Of																																																																																																		183,200,000,000	165,100,000,000
Unsettled forward starting reverse repurchase and securities borrowing agreements	10,500,000,000	13,200,000,000
Unsettled reverse repurchase and securities borrowing agreements with regular way settlement periods	41,700,000,000	21,700,000,000
Unfunded Commitments Investments Private Equity Funds Third Party	323,000,000	370,000,000
Unfunded Commitments Investments Other Equity Investments	1,400,000,000	1,500,000,000
Investments Valued at Net Asset Value, Unfunded Commitments, Investments, Fair Value	236,000,000	333,000,000
Commitments To Extend Credit Leveraged And Acquisition Finance Activities	7,300,000,000	8,800,000,000
Average balances of U.S. tri-party repurchases	$ 362,000,000,000