Off-Balance Sheet Lending-Related Financial Instruments, Guarantees and Other Commitments (Details) (USD $)	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	$ 997,503,000,000	$ 975,662,000,000	$ 985,934,000,000
Off Balance Sheet Lending Related Financial Instruments Carrying Value	1,128,000,000	1,052,000,000
Allowance for lending-related commitments	750,000,000	673,000,000	688,000,000	717,000,000
Off balance sheet lending related financial instruments guarantees and other commitments - supplemental information [Abstract]
Standby Letters of Credit, Unissued Commitments	43,500,000,000	44,100,000,000
Unsettled forward starting reverse repurchase and securities borrowing agreements	9,200,000,000	14,400,000,000
Unsettled reverse repurchase and securities borrowing agreements with regular way settlement periods		51,800,000,000		25,500,000,000
Unfunded Commitments Investments Private Equity Funds Third Party	571,000,000	789,000,000
Unfunded Commitments Investments Other Equity Investments	1,600,000,000	1,500,000,000
Investments Valued at Net Asset Value, Unfunded Commitments, Investments, Fair Value	557,000,000	820,000,000
Commitments To Extend Credit Leveraged And Acquisition Finance Activities	6,400,000,000	6,100,000,000
Consumer Loan [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	596,439,000,000	592,923,000,000
Off Balance Sheet Lending Related Financial Instruments Carrying Value	7,000,000	7,000,000
Consumer Loan Excluding Credit Card
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	63,121,000,000	62,307,000,000
Off Balance Sheet Lending Related Financial Instruments Carrying Value	7,000,000	7,000,000
Home Equity - Senior Lien [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	16,248,000,000	16,542,000,000
Off Balance Sheet Lending Related Financial Instruments Carrying Value	0	0
Home Equity - Junior Lien [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	25,416,000,000	26,408,000,000
Off Balance Sheet Lending Related Financial Instruments Carrying Value	0	0
Prime Mortgage [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	2,594,000,000	1,500,000,000
Off Balance Sheet Lending Related Financial Instruments Carrying Value	0	0
Subprime Mortgage [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	0	0
Off Balance Sheet Lending Related Financial Instruments Carrying Value	0	0
Automobile Loans [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	7,127,000,000	6,694,000,000
Off Balance Sheet Lending Related Financial Instruments Carrying Value	1,000,000	1,000,000
Business Banking [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	10,941,000,000	10,299,000,000
Off Balance Sheet Lending Related Financial Instruments Carrying Value	6,000,000	6,000,000
Student and Other [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	795,000,000	864,000,000
Off Balance Sheet Lending Related Financial Instruments Carrying Value	0	0
Credit Card
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	533,318,000,000	530,616,000,000
Off Balance Sheet Lending Related Financial Instruments Carrying Value	0	0
Wholesale
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	401,064,000,000	382,739,000,000
Off Balance Sheet Lending Related Financial Instruments Carrying Value	1,121,000,000	1,045,000,000
Other Unfunded Commitments to Extend Credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	223,208,000,000	215,251,000,000
Off Balance Sheet Lending Related Financial Instruments Carrying Value	426,000,000	347,000,000
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	603,000,000	1,100,000,000
Standby Letters of Credit, and Other Financial Guarantees [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	102,014,000,000	101,899,000,000
Off Balance Sheet Lending Related Financial Instruments Carrying Value	693,000,000	696,000,000
Allowance for lending-related commitments	315,000,000	317,000,000
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 Standby letters of credit and other financial guarantees	18,700,000,000	19,800,000,000
Credit Enhancements and Bond and Commercial Paper Liquidity Commitments to US States and Municipalities Hospitals and Other Not For Profit Entities	47,900,000,000	48,600,000,000
Standby Letters of Credit, Collateral Held	42,263,000,000	41,529,000,000
Unused Advised Lines of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	70,735,000,000	60,203,000,000
Off Balance Sheet Lending Related Financial Instruments Carrying Value	0	0
Other letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	5,107,000,000	5,386,000,000
Off Balance Sheet Lending Related Financial Instruments Carrying Value	2,000,000	2,000,000
Allowance for lending-related commitments	2,000,000	2,000,000
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 letters of credit	934,000,000	974,000,000
Other Letters of Credit, Collateral Held	1,201,000,000	1,264,000,000
Securities Lending Indemnifications [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Guarantor Obligations and Commitments, Maximum Exposure Undiscounted	194,641,000,000	186,077,000,000
Off balance sheet lending related financial instruments guarantees and other commitments - supplemental information [Abstract]
Indemnification Agreement Securities Lending Guarantees Collateral Held In Support Of	195,900,000,000	186,300,000,000
Derivative Qualifying as Guarantees [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Guarantor Obligations and Commitments, Maximum Exposure Undiscounted	72,800,000,000	75,593,000,000
Guarantor Obligations and Commitments, Current Carrying Value	224,000,000	457,000,000
Off balance sheet lending related financial instruments guarantees and other commitments - supplemental information [Abstract]
Derivative Qualifying As Guarantees Payables	315,000,000	555,000,000
Derivative Qualifying As Guarantees Receivables	91,000,000	98,000,000
Unsettled Reverse Repurchase and Securities Borrowing Agreements [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Guarantor Obligations and Commitments, Maximum Exposure Undiscounted	61,013,000,000	39,939,000,000
Guarantor Obligations and Commitments, Current Carrying Value	0	0
Other Guarantees and Commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Guarantor Obligations and Commitments, Maximum Exposure Undiscounted	6,206,000,000	6,321,000,000
Guarantor Obligations and Commitments, Current Carrying Value	(80,000,000)	(5,000,000)
Letters Of Credit Hedged By Derivative Transactions [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Guarantor Obligations and Commitments, Maximum Exposure Undiscounted	3,900,000,000	3,900,000,000
Repurchase Liability [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Allowance for lending-related commitments	3,516,000,000	3,557,000,000	3,474,000,000	3,285,000,000
Loans Sold With Recourse [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Guarantor Obligations and Commitments, Maximum Exposure Undiscounted	10,183,000,000	10,397,000,000
Allowance for lending-related commitments	142,000,000	148,000,000
Expires in one year or less [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	706,560,000,000
Expires in one year or less [Member] | Consumer Loan [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	556,191,000,000
Expires in one year or less [Member] | Consumer Loan Excluding Credit Card
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	22,873,000,000
Expires in one year or less [Member] | Home Equity - Senior Lien [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	1,103,000,000
Expires in one year or less [Member] | Home Equity - Junior Lien [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	2,361,000,000
Expires in one year or less [Member] | Prime Mortgage [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	2,594,000,000
Expires in one year or less [Member] | Subprime Mortgage [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	0
Expires in one year or less [Member] | Automobile Loans [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	6,771,000,000
Expires in one year or less [Member] | Business Banking [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	10,024,000,000
Expires in one year or less [Member] | Student and Other [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	20,000,000
Expires in one year or less [Member] | Credit Card
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	533,318,000,000
Expires in one year or less [Member] | Wholesale
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	150,369,000,000
Expires in one year or less [Member] | Other Unfunded Commitments to Extend Credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	61,030,000,000
Expires in one year or less [Member] | Standby Letters of Credit, and Other Financial Guarantees [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	28,383,000,000
Expires in one year or less [Member] | Unused Advised Lines of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	56,746,000,000
Expires in one year or less [Member] | Other letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	4,210,000,000
Expires in one year or less [Member] | Securities Lending Indemnifications [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Guarantor Obligations and Commitments, Maximum Exposure Undiscounted	194,641,000,000
Expires in one year or less [Member] | Derivative Qualifying as Guarantees [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Guarantor Obligations and Commitments, Maximum Exposure Undiscounted	2,903,000,000
Expires in one year or less [Member] | Unsettled Reverse Repurchase and Securities Borrowing Agreements [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Guarantor Obligations and Commitments, Maximum Exposure Undiscounted	61,013,000,000
Expires in one year or less [Member] | Other Guarantees and Commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Guarantor Obligations and Commitments, Maximum Exposure Undiscounted	948,000,000
Expires after one year through three years [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	125,113,000,000
Expires after one year through three years [Member] | Consumer Loan [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	14,842,000,000
Expires after one year through three years [Member] | Consumer Loan Excluding Credit Card
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	14,842,000,000
Expires after one year through three years [Member] | Home Equity - Senior Lien [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	4,921,000,000
Expires after one year through three years [Member] | Home Equity - Junior Lien [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	8,981,000,000
Expires after one year through three years [Member] | Prime Mortgage [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	0
Expires after one year through three years [Member] | Subprime Mortgage [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	0
Expires after one year through three years [Member] | Automobile Loans [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	234,000,000
Expires after one year through three years [Member] | Business Banking [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	513,000,000
Expires after one year through three years [Member] | Student and Other [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	193,000,000
Expires after one year through three years [Member] | Credit Card
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	0
Expires after one year through three years [Member] | Wholesale
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	110,271,000,000
Expires after one year through three years [Member] | Other Unfunded Commitments to Extend Credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	63,684,000,000
Expires after one year through three years [Member] | Standby Letters of Credit, and Other Financial Guarantees [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	32,434,000,000
Expires after one year through three years [Member] | Unused Advised Lines of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	13,375,000,000
Expires after one year through three years [Member] | Other letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	778,000,000
Expires after one year through three years [Member] | Securities Lending Indemnifications [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Guarantor Obligations and Commitments, Maximum Exposure Undiscounted	0
Expires after one year through three years [Member] | Derivative Qualifying as Guarantees [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Guarantor Obligations and Commitments, Maximum Exposure Undiscounted	4,797,000,000
Expires after one year through three years [Member] | Unsettled Reverse Repurchase and Securities Borrowing Agreements [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Guarantor Obligations and Commitments, Maximum Exposure Undiscounted	0
Expires after one year through three years [Member] | Other Guarantees and Commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Guarantor Obligations and Commitments, Maximum Exposure Undiscounted	292,000,000
Expires after three years through five years [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	145,218,000,000
Expires after three years through five years [Member] | Consumer Loan [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	12,664,000,000
Expires after three years through five years [Member] | Consumer Loan Excluding Credit Card
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	12,664,000,000
Expires after three years through five years [Member] | Home Equity - Senior Lien [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	4,742,000,000
Expires after three years through five years [Member] | Home Equity - Junior Lien [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	7,630,000,000
Expires after three years through five years [Member] | Prime Mortgage [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	0
Expires after three years through five years [Member] | Subprime Mortgage [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	0
Expires after three years through five years [Member] | Automobile Loans [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	122,000,000
Expires after three years through five years [Member] | Business Banking [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	76,000,000
Expires after three years through five years [Member] | Student and Other [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	94,000,000
Expires after three years through five years [Member] | Credit Card
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	0
Expires after three years through five years [Member] | Wholesale
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	132,554,000,000
Expires after three years through five years [Member] | Other Unfunded Commitments to Extend Credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	92,950,000,000
Expires after three years through five years [Member] | Standby Letters of Credit, and Other Financial Guarantees [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	39,039,000,000
Expires after three years through five years [Member] | Unused Advised Lines of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	446,000,000
Expires after three years through five years [Member] | Other letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	119,000,000
Expires after three years through five years [Member] | Securities Lending Indemnifications [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Guarantor Obligations and Commitments, Maximum Exposure Undiscounted	0
Expires after three years through five years [Member] | Derivative Qualifying as Guarantees [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Guarantor Obligations and Commitments, Maximum Exposure Undiscounted	28,589,000,000
Expires after three years through five years [Member] | Unsettled Reverse Repurchase and Securities Borrowing Agreements [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Guarantor Obligations and Commitments, Maximum Exposure Undiscounted	0
Expires after three years through five years [Member] | Other Guarantees and Commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Guarantor Obligations and Commitments, Maximum Exposure Undiscounted	357,000,000
Expires after five years [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	20,612,000,000
Expires after five years [Member] | Consumer Loan [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	12,742,000,000
Expires after five years [Member] | Consumer Loan Excluding Credit Card
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	12,742,000,000
Expires after five years [Member] | Home Equity - Senior Lien [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	5,482,000,000
Expires after five years [Member] | Home Equity - Junior Lien [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	6,444,000,000
Expires after five years [Member] | Prime Mortgage [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	0
Expires after five years [Member] | Subprime Mortgage [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	0
Expires after five years [Member] | Automobile Loans [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	0
Expires after five years [Member] | Business Banking [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	328,000,000
Expires after five years [Member] | Student and Other [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	488,000,000
Expires after five years [Member] | Credit Card
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	0
Expires after five years [Member] | Wholesale
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	7,870,000,000
Expires after five years [Member] | Other Unfunded Commitments to Extend Credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	5,544,000,000
Expires after five years [Member] | Standby Letters of Credit, and Other Financial Guarantees [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	2,158,000,000
Expires after five years [Member] | Unused Advised Lines of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	168,000,000
Expires after five years [Member] | Other letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off Balance Sheet Lending Related Financial Instruments Contractual Amount	0
Expires after five years [Member] | Securities Lending Indemnifications [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Guarantor Obligations and Commitments, Maximum Exposure Undiscounted	0
Expires after five years [Member] | Derivative Qualifying as Guarantees [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Guarantor Obligations and Commitments, Maximum Exposure Undiscounted	36,511,000,000
Expires after five years [Member] | Unsettled Reverse Repurchase and Securities Borrowing Agreements [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Guarantor Obligations and Commitments, Maximum Exposure Undiscounted	0
Expires after five years [Member] | Other Guarantees and Commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Guarantor Obligations and Commitments, Maximum Exposure Undiscounted	$ 4,609,000,000