Off-Balance Sheet Lending-Related Financial Instruments, Guarantees and Other Commitments (Details) (USD $)	3 Months Ended		9 Months Ended																																																																																																																							9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 Wholesale	Sep. 30, 2013 Wholesale	Sep. 30, 2014 Consumer Loan	Dec. 31, 2013 Consumer Loan	Sep. 30, 2014 Consumer Loan Excluding Credit Card	Dec. 31, 2013 Consumer Loan Excluding Credit Card	Sep. 30, 2014 Home Equity - Senior Lien	Dec. 31, 2013 Home Equity - Senior Lien	Sep. 30, 2014 Home Equity - Junior Lien	Dec. 31, 2013 Home Equity - Junior Lien	Sep. 30, 2014 Prime Mortgages, Including Option ARMs	Dec. 31, 2013 Prime Mortgages, Including Option ARMs	Sep. 30, 2014 Subprime Mortgages	Dec. 31, 2013 Subprime Mortgages	Sep. 30, 2014 Auto Loans	Dec. 31, 2013 Auto Loans	Sep. 30, 2014 Business Banking Loans	Dec. 31, 2013 Business Banking Loans	Sep. 30, 2014 Student and Other Loans	Dec. 31, 2013 Student and Other Loans	Sep. 30, 2014 Credit Card Loan	Dec. 31, 2013 Credit Card Loan	Sep. 30, 2014 Total retained loans	Dec. 31, 2013 Total retained loans	Sep. 30, 2014 Total retained loans Total U.S. Wholesale	Dec. 31, 2013 Total retained loans Total U.S. Wholesale	Sep. 30, 2014 Other Unfunded Commitments to Extend Credit	Dec. 31, 2013 Other Unfunded Commitments to Extend Credit	Sep. 30, 2014 Standby Letters of Credit, and Other Financial Guarantees	Dec. 31, 2013 Standby Letters of Credit, and Other Financial Guarantees	Sep. 30, 2014 Unused Advised Lines of Credit	Dec. 31, 2013 Unused Advised Lines of Credit	Sep. 30, 2014 Other Letters of Credit	Dec. 31, 2013 Other Letters of Credit	Sep. 30, 2014 Securities Lending Indemnifications	Dec. 31, 2013 Securities Lending Indemnifications	Sep. 30, 2014 Derivatives Qualifying as Guarantees	Dec. 31, 2013 Derivatives Qualifying as Guarantees	Sep. 30, 2014 Unsettled Reverse Repurchase and Securities Borrowing Agreements	Dec. 31, 2013 Unsettled Reverse Repurchase and Securities Borrowing Agreements	Sep. 30, 2014 Residential mortgage Warranty Reserves	Jun. 30, 2014 Residential mortgage Warranty Reserves	Dec. 31, 2013 Residential mortgage Warranty Reserves	Sep. 30, 2013 Residential mortgage Warranty Reserves	Jun. 30, 2013 Residential mortgage Warranty Reserves	Dec. 31, 2012 Residential mortgage Warranty Reserves	Sep. 30, 2014 Loans Sold With Recourse	Dec. 31, 2013 Loans Sold With Recourse	Sep. 30, 2014 Other Guarantees and Commitments	Dec. 31, 2013 Other Guarantees and Commitments	Sep. 30, 2014 Letters of Credit Hedged by Derivative Transactions	Dec. 31, 2013 Letters of Credit Hedged by Derivative Transactions	Sep. 30, 2014 Expires in one year or less	Sep. 30, 2014 Expires in one year or less Consumer Loan	Sep. 30, 2014 Expires in one year or less Consumer Loan Excluding Credit Card	Sep. 30, 2014 Expires in one year or less Home Equity - Senior Lien	Sep. 30, 2014 Expires in one year or less Home Equity - Junior Lien	Sep. 30, 2014 Expires in one year or less Prime Mortgages, Including Option ARMs	Sep. 30, 2014 Expires in one year or less Subprime Mortgages	Sep. 30, 2014 Expires in one year or less Auto Loans	Sep. 30, 2014 Expires in one year or less Business Banking Loans	Sep. 30, 2014 Expires in one year or less Student and Other Loans	Sep. 30, 2014 Expires in one year or less Credit Card Loan	Sep. 30, 2014 Expires in one year or less Total retained loans	Sep. 30, 2014 Expires in one year or less Other Unfunded Commitments to Extend Credit	Sep. 30, 2014 Expires in one year or less Standby Letters of Credit, and Other Financial Guarantees	Sep. 30, 2014 Expires in one year or less Unused Advised Lines of Credit	Sep. 30, 2014 Expires in one year or less Other Letters of Credit	Sep. 30, 2014 Expires in one year or less Securities Lending Indemnifications	Sep. 30, 2014 Expires in one year or less Derivatives Qualifying as Guarantees	Sep. 30, 2014 Expires in one year or less Unsettled Reverse Repurchase and Securities Borrowing Agreements	Sep. 30, 2014 Expires in one year or less Other Guarantees and Commitments	Sep. 30, 2014 Expires after one year through three years	Sep. 30, 2014 Expires after one year through three years Consumer Loan	Sep. 30, 2014 Expires after one year through three years Consumer Loan Excluding Credit Card	Sep. 30, 2014 Expires after one year through three years Home Equity - Senior Lien	Sep. 30, 2014 Expires after one year through three years Home Equity - Junior Lien	Sep. 30, 2014 Expires after one year through three years Prime Mortgages, Including Option ARMs	Sep. 30, 2014 Expires after one year through three years Subprime Mortgages	Sep. 30, 2014 Expires after one year through three years Auto Loans	Sep. 30, 2014 Expires after one year through three years Business Banking Loans	Sep. 30, 2014 Expires after one year through three years Student and Other Loans	Sep. 30, 2014 Expires after one year through three years Credit Card Loan	Sep. 30, 2014 Expires after one year through three years Total retained loans	Sep. 30, 2014 Expires after one year through three years Other Unfunded Commitments to Extend Credit	Sep. 30, 2014 Expires after one year through three years Standby Letters of Credit, and Other Financial Guarantees	Sep. 30, 2014 Expires after one year through three years Unused Advised Lines of Credit	Sep. 30, 2014 Expires after one year through three years Other Letters of Credit	Sep. 30, 2014 Expires after one year through three years Securities Lending Indemnifications	Sep. 30, 2014 Expires after one year through three years Derivatives Qualifying as Guarantees	Sep. 30, 2014 Expires after one year through three years Unsettled Reverse Repurchase and Securities Borrowing Agreements	Sep. 30, 2014 Expires after one year through three years Other Guarantees and Commitments	Sep. 30, 2014 Expires after three years through five years	Sep. 30, 2014 Expires after three years through five years Consumer Loan	Sep. 30, 2014 Expires after three years through five years Consumer Loan Excluding Credit Card	Sep. 30, 2014 Expires after three years through five years Home Equity - Senior Lien	Sep. 30, 2014 Expires after three years through five years Home Equity - Junior Lien	Sep. 30, 2014 Expires after three years through five years Prime Mortgages, Including Option ARMs	Sep. 30, 2014 Expires after three years through five years Subprime Mortgages	Sep. 30, 2014 Expires after three years through five years Auto Loans	Sep. 30, 2014 Expires after three years through five years Business Banking Loans	Sep. 30, 2014 Expires after three years through five years Student and Other Loans	Sep. 30, 2014 Expires after three years through five years Credit Card Loan	Sep. 30, 2014 Expires after three years through five years Total retained loans	Sep. 30, 2014 Expires after three years through five years Other Unfunded Commitments to Extend Credit	Sep. 30, 2014 Expires after three years through five years Standby Letters of Credit, and Other Financial Guarantees	Sep. 30, 2014 Expires after three years through five years Unused Advised Lines of Credit	Sep. 30, 2014 Expires after three years through five years Other Letters of Credit	Sep. 30, 2014 Expires after three years through five years Securities Lending Indemnifications	Sep. 30, 2014 Expires after three years through five years Derivatives Qualifying as Guarantees	Sep. 30, 2014 Expires after three years through five years Unsettled Reverse Repurchase and Securities Borrowing Agreements	Sep. 30, 2014 Expires after three years through five years Other Guarantees and Commitments	Sep. 30, 2014 Expires after five years	Sep. 30, 2014 Expires after five years Consumer Loan	Sep. 30, 2014 Expires after five years Consumer Loan Excluding Credit Card	Sep. 30, 2014 Expires after five years Home Equity - Senior Lien	Sep. 30, 2014 Expires after five years Home Equity - Junior Lien	Sep. 30, 2014 Expires after five years Prime Mortgages, Including Option ARMs	Sep. 30, 2014 Expires after five years Subprime Mortgages	Sep. 30, 2014 Expires after five years Auto Loans	Sep. 30, 2014 Expires after five years Business Banking Loans	Sep. 30, 2014 Expires after five years Student and Other Loans	Sep. 30, 2014 Expires after five years Credit Card Loan	Sep. 30, 2014 Expires after five years Total retained loans	Sep. 30, 2014 Expires after five years Other Unfunded Commitments to Extend Credit	Sep. 30, 2014 Expires after five years Standby Letters of Credit, and Other Financial Guarantees	Sep. 30, 2014 Expires after five years Unused Advised Lines of Credit	Sep. 30, 2014 Expires after five years Other Letters of Credit	Sep. 30, 2014 Expires after five years Securities Lending Indemnifications	Sep. 30, 2014 Expires after five years Derivatives Qualifying as Guarantees	Sep. 30, 2014 Expires after five years Unsettled Reverse Repurchase and Securities Borrowing Agreements	Sep. 30, 2014 Expires after five years Other Guarantees and Commitments	Sep. 30, 2014 Days Past Due, 60 or More Credit Card Loan Lending-Related Commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information
Line of credit clos criteria, period past due																																																																																																																																										60 days
Total lending-related, contractual amount	$ 1,057,204,000,000	$ 1,040,105,000,000	$ 1,057,204,000,000	$ 1,040,105,000,000	$ 1,031,672,000,000	$ 470,991,000,000	$ 449,067,000,000	$ 586,213,000,000	$ 585,440,000,000	$ 54,912,000,000	$ 56,057,000,000	$ 11,419,000,000	$ 13,158,000,000	$ 14,747,000,000	$ 17,837,000,000	$ 5,593,000,000	$ 4,817,000,000	$ 0	$ 0	$ 10,570,000,000	$ 8,309,000,000	$ 12,001,000,000	$ 11,251,000,000	$ 582,000,000	$ 685,000,000	$ 531,301,000,000	$ 529,383,000,000	$ 470,991,000,000	$ 446,232,000,000			$ 272,571,000,000	$ 246,495,000,000	$ 89,705,000,000	$ 92,723,000,000	$ 103,546,000,000	$ 101,994,000,000	$ 5,169,000,000	$ 5,020,000,000																			$ 752,761,000,000	$ 563,395,000,000	$ 32,094,000,000	$ 2,258,000,000	$ 3,604,000,000	$ 5,593,000,000	$ 0	$ 10,075,000,000	$ 10,448,000,000	$ 116,000,000	$ 531,301,000,000	$ 189,366,000,000	$ 70,427,000,000	$ 23,366,000,000	$ 91,389,000,000	$ 4,184,000,000					$ 137,289,000,000	$ 11,302,000,000	$ 11,302,000,000	$ 4,232,000,000	$ 5,914,000,000	$ 0	$ 0	$ 236,000,000	$ 908,000,000	$ 12,000,000	$ 0	$ 125,987,000,000	$ 82,730,000,000	$ 30,892,000,000	$ 11,493,000,000	$ 872,000,000					$ 149,783,000,000	$ 5,642,000,000	$ 5,642,000,000	$ 2,428,000,000	$ 2,766,000,000	$ 0	$ 0	$ 235,000,000	$ 212,000,000	$ 1,000,000	$ 0	$ 144,141,000,000	$ 110,051,000,000	$ 33,474,000,000	$ 503,000,000	$ 113,000,000					$ 17,371,000,000	$ 5,874,000,000	$ 5,874,000,000	$ 2,501,000,000	$ 2,463,000,000	$ 0	$ 0	$ 24,000,000	$ 433,000,000	$ 453,000,000	$ 0	$ 11,497,000,000	$ 9,363,000,000	$ 1,973,000,000	$ 161,000,000	$ 0
Total lending related, carrying value	1,197,000,000		1,197,000,000		1,385,000,000			9,000,000	8,000,000	9,000,000	8,000,000	0	0	0	0	0	0	0	0	1,000,000	1,000,000	8,000,000	7,000,000	0	0	0	0	1,188,000,000	1,377,000,000			387,000,000	432,000,000	800,000,000	943,000,000	0	0	1,000,000	2,000,000
Other guarantees and commitments, contractual amount																																								208,042,000,000	169,709,000,000	53,731,000,000	56,274,000,000	70,472,000,000	38,211,000,000									5,754,000,000	6,786,000,000	4,500,000,000	4,500,000,000																	208,042,000,000	2,122,000,000	70,472,000,000	336,000,000																	0	562,000,000	0	1,973,000,000																	0	13,104,000,000	0	1,420,000,000																	0	37,943,000,000	0	2,025,000,000
Other guarantees and commitments, carrying value																																								0	0	92,000,000	72,000,000											(74,000,000)	(99,000,000)
Unsettled reverse repurchase and securities borrowing agreements, carrying value																																												0	0
Allowance for lending-related commitments																																		240,000,000	263,000,000			1,000,000	2,000,000							391,000,000	436,000,000	681,000,000	2,182,000,000	2,476,000,000	2,811,000,000
Indemnification agreements loan sale and securitization loans sold with recourse contractual amount																																																				6,404,000,000	7,692,000,000
Indemnification agreements, loan sale and securitization, loans sold in recourse, carrying value																																																				108,000,000	131,000,000
Off balance sheet lending related financial instruments guarantees and other commitments - supplemental information [Abstract]
Lending related, contractual amount net of risk participations other unfunded commitments to extend credit																																234,000,000	476,000,000
Lending related, contractual amount net of risk participations standby letters of credit and other financial guarantees																																		13,500,000,000	14,800,000,000
Lending related, contractual amount net of risk participations other letters of credit																																						607,000,000	622,000,000
Credit enhancements and bond and commercial paper liquidity commitments to US states and municipalities hospitals and other not for profit entities																																16,400,000,000	18,900,000,000	14,800,000,000	17,200,000,000
Standby letters of credit, unissued commitments	44,500,000,000		44,500,000,000		42,800,000,000
Total lending related, contractual amount																														66.00%	68.00%
Indemnification agreement securities lending guarantees collateral held in support of																																								216,400,000,000	176,400,000,000
Unsettled forward starting reverse repurchase and securities borrowing agreements	9,200,000,000		9,200,000,000		9,900,000,000
Unsettled reverse repurchase and securities borrowing agreements with regular way settlement periods	61,300,000,000		61,300,000,000		28,300,000,000
Unfunded commitments investments private equity funds third party	117,000,000		117,000,000		215,000,000
Unfunded commitments investments other equity investments	940,000,000		940,000,000		1,900,000,000
Investments valued at net fair value, unfunded commitments	110,000,000		110,000,000		184,000,000
Commitments to extend credit leveraged and acquisition finance activities	34,600,000,000		34,600,000,000		18,300,000,000
Average balances of U.S. tri-party repurchases	$ 181,000,000,000	$ 231,000,000,000	$ 182,000,000,000	$ 268,000,000,000