Loans - Troubled Debt Restructurings (Details) (USD $)										3 Months Ended		6 Months Ended			6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended				6 Months Ended					6 Months Ended	3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended				6 Months Ended		3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended				6 Months Ended		3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended				6 Months Ended		3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended				6 Months Ended		3 Months Ended		6 Months Ended					3 Months Ended		6 Months Ended			6 Months Ended				3 Months Ended		6 Months Ended			6 Months Ended			6 Months Ended					3 Months Ended		6 Months Ended		12 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended									3 Months Ended		6 Months Ended						3 Months Ended		6 Months Ended						3 Months Ended		6 Months Ended						3 Months Ended		6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Apr. 05, 2012 Mortgage Foreclosure Investigations and Litigation [Member] Global settlement on servicing and origination of mortgages [Member] Settlement of Litigation, Additional Relief Provided to Certain Borrowers [Member]	Jun. 30, 2013 Consumer, excluding credit card	Dec. 31, 2012 Consumer, excluding credit card	Jun. 30, 2012 Consumer, excluding credit card	Jun. 30, 2013 Consumer, excluding credit card Consumer Loan Excluding Credit Card	Dec. 31, 2012 Consumer, excluding credit card Consumer Loan Excluding Credit Card	Jun. 30, 2013 Consumer, excluding credit card Residential Real Estate, Excluding Purchased Credit-Impaired [Member]	Jun. 30, 2012 Consumer, excluding credit card Residential Real Estate, Excluding Purchased Credit-Impaired [Member]	Jun. 30, 2013 Consumer, excluding credit card Residential Real Estate, Excluding Purchased Credit-Impaired [Member]	Jun. 30, 2012 Consumer, excluding credit card Residential Real Estate, Excluding Purchased Credit-Impaired [Member]	Dec. 31, 2012 Consumer, excluding credit card Residential Real Estate, Excluding Purchased Credit-Impaired [Member]	Jun. 30, 2013 Consumer, excluding credit card Residential Real Estate, Excluding Purchased Credit-Impaired [Member] Maximum	Jun. 30, 2013 Consumer, excluding credit card Residential Real Estate, Excluding Purchased Credit-Impaired [Member] Trial Modifications Approved On Or After July 1, 2010 [Member]	Jun. 30, 2013 Consumer, excluding credit card Residential Real Estate, Excluding Purchased Credit-Impaired [Member] Trial Modification [Member] loans	Jun. 30, 2012 Consumer, excluding credit card Residential Real Estate, Excluding Purchased Credit-Impaired [Member] Trial Modification [Member] loans	Jun. 30, 2013 Consumer, excluding credit card Residential Real Estate, Excluding Purchased Credit-Impaired [Member] Trial Modification [Member] loans	Jun. 30, 2012 Consumer, excluding credit card Residential Real Estate, Excluding Purchased Credit-Impaired [Member] Trial Modification [Member] loans	Jun. 30, 2013 Consumer, excluding credit card Residential Real Estate, Excluding Purchased Credit-Impaired [Member] Permanent Modification [Member] years loans	Jun. 30, 2012 Consumer, excluding credit card Residential Real Estate, Excluding Purchased Credit-Impaired [Member] Permanent Modification [Member] years loans	Jun. 30, 2013 Consumer, excluding credit card Residential Real Estate, Excluding Purchased Credit-Impaired [Member] Permanent Modification [Member] loans years	Jun. 30, 2012 Consumer, excluding credit card Residential Real Estate, Excluding Purchased Credit-Impaired [Member] Permanent Modification [Member] years loans	Jun. 30, 2013 Consumer, excluding credit card Residential Real Estate, Excluding Purchased Credit-Impaired [Member] Nonaccrual [Member]	Dec. 31, 2012 Consumer, excluding credit card Residential Real Estate, Excluding Purchased Credit-Impaired [Member] Nonaccrual [Member]	Jun. 30, 2013 Consumer, excluding credit card Residential Real Estate, Excluding Purchased Credit-Impaired [Member] Regulatory Guidance Regarding Chapter 7 Loans [Member] loans	Jun. 30, 2013 Consumer, excluding credit card Residential Real Estate, Excluding Purchased Credit-Impaired [Member] Regulatory Guidance Regarding Chapter 7 Loans [Member] Maximum	Jun. 30, 2013 Consumer, excluding credit card Residential Real Estate, Excluding Purchased Credit-Impaired [Member] Regulatory Guidance Regarding Chapter 7 Loans [Member] Minimum	Jun. 30, 2013 Consumer, excluding credit card Residential Real Estate, Excluding Purchased Credit-Impaired [Member] Regulatory Guidance Regarding Chapter 7 Loans [Member] Days Past Due, 30 or More [Member] Maximum	Jun. 30, 2013 Consumer, excluding credit card Residential Real Estate, Excluding Purchased Credit-Impaired [Member] Regulatory Guidance Regarding Chapter 7 Loans [Member] Nonaccrual [Member]	Jun. 30, 2013 Consumer, excluding credit card Residential Real Estate, Excluding Purchased Credit-Impaired [Member] Regulatory Guidance Regarding Chapter 7 Loans [Member] Days Past Due, 60 or Less [Member] Maximum	Jun. 30, 2013 Consumer, excluding credit card Home Equity - Senior Lien	Jun. 30, 2012 Consumer, excluding credit card Home Equity - Senior Lien	Jun. 30, 2013 Consumer, excluding credit card Home Equity - Senior Lien	Jun. 30, 2012 Consumer, excluding credit card Home Equity - Senior Lien	Dec. 31, 2012 Consumer, excluding credit card Home Equity - Senior Lien	Jun. 30, 2013 Consumer, excluding credit card Home Equity - Senior Lien Trial Modification [Member] loans	Jun. 30, 2012 Consumer, excluding credit card Home Equity - Senior Lien Trial Modification [Member] loans	Jun. 30, 2013 Consumer, excluding credit card Home Equity - Senior Lien Trial Modification [Member] loans	Jun. 30, 2012 Consumer, excluding credit card Home Equity - Senior Lien Trial Modification [Member] loans	Jun. 30, 2013 Consumer, excluding credit card Home Equity - Senior Lien Permanent Modification [Member] years loans	Jun. 30, 2012 Consumer, excluding credit card Home Equity - Senior Lien Permanent Modification [Member] years loans	Jun. 30, 2013 Consumer, excluding credit card Home Equity - Senior Lien Permanent Modification [Member] loans years	Jun. 30, 2012 Consumer, excluding credit card Home Equity - Senior Lien Permanent Modification [Member] loans years	Jun. 30, 2013 Consumer, excluding credit card Home Equity - Senior Lien Nonaccrual [Member]	Dec. 31, 2012 Consumer, excluding credit card Home Equity - Senior Lien Nonaccrual [Member]	Jun. 30, 2013 Consumer, excluding credit card Home Equity - Senior Lien Regulatory Guidance Regarding Chapter 7 Loans [Member] loans	Jun. 30, 2013 Consumer, excluding credit card Home Equity - Senior Lien Regulatory Guidance Regarding Chapter 7 Loans [Member] Nonaccrual [Member]	Jun. 30, 2013 Consumer, excluding credit card Home Equity - Junior Lien	Jun. 30, 2012 Consumer, excluding credit card Home Equity - Junior Lien	Jun. 30, 2013 Consumer, excluding credit card Home Equity - Junior Lien	Jun. 30, 2012 Consumer, excluding credit card Home Equity - Junior Lien	Dec. 31, 2012 Consumer, excluding credit card Home Equity - Junior Lien	Jun. 30, 2013 Consumer, excluding credit card Home Equity - Junior Lien Trial Modification [Member] loans	Jun. 30, 2012 Consumer, excluding credit card Home Equity - Junior Lien Trial Modification [Member] loans	Jun. 30, 2013 Consumer, excluding credit card Home Equity - Junior Lien Trial Modification [Member] loans	Jun. 30, 2012 Consumer, excluding credit card Home Equity - Junior Lien Trial Modification [Member] loans	Jun. 30, 2013 Consumer, excluding credit card Home Equity - Junior Lien Permanent Modification [Member] loans years	Jun. 30, 2012 Consumer, excluding credit card Home Equity - Junior Lien Permanent Modification [Member] years loans	Jun. 30, 2013 Consumer, excluding credit card Home Equity - Junior Lien Permanent Modification [Member] years loans	Jun. 30, 2012 Consumer, excluding credit card Home Equity - Junior Lien Permanent Modification [Member] years loans	Jun. 30, 2013 Consumer, excluding credit card Home Equity - Junior Lien Nonaccrual [Member]	Dec. 31, 2012 Consumer, excluding credit card Home Equity - Junior Lien Nonaccrual [Member]	Jun. 30, 2013 Consumer, excluding credit card Home Equity - Junior Lien Regulatory Guidance Regarding Chapter 7 Loans [Member] loans	Jun. 30, 2013 Consumer, excluding credit card Home Equity - Junior Lien Regulatory Guidance Regarding Chapter 7 Loans [Member] Nonaccrual [Member]	Jun. 30, 2013 Consumer, excluding credit card Prime Mortgages, Including Option ARMs	Jun. 30, 2012 Consumer, excluding credit card Prime Mortgages, Including Option ARMs	Jun. 30, 2013 Consumer, excluding credit card Prime Mortgages, Including Option ARMs	Jun. 30, 2012 Consumer, excluding credit card Prime Mortgages, Including Option ARMs	Dec. 31, 2012 Consumer, excluding credit card Prime Mortgages, Including Option ARMs	Jun. 30, 2013 Consumer, excluding credit card Prime Mortgages, Including Option ARMs Trial Modification [Member] loans	Jun. 30, 2012 Consumer, excluding credit card Prime Mortgages, Including Option ARMs Trial Modification [Member] loans	Jun. 30, 2013 Consumer, excluding credit card Prime Mortgages, Including Option ARMs Trial Modification [Member] loans	Jun. 30, 2012 Consumer, excluding credit card Prime Mortgages, Including Option ARMs Trial Modification [Member] loans	Jun. 30, 2013 Consumer, excluding credit card Prime Mortgages, Including Option ARMs Permanent Modification [Member] loans years	Jun. 30, 2012 Consumer, excluding credit card Prime Mortgages, Including Option ARMs Permanent Modification [Member] loans years	Jun. 30, 2013 Consumer, excluding credit card Prime Mortgages, Including Option ARMs Permanent Modification [Member] years loans	Jun. 30, 2012 Consumer, excluding credit card Prime Mortgages, Including Option ARMs Permanent Modification [Member] loans years	Jun. 30, 2013 Consumer, excluding credit card Prime Mortgages, Including Option ARMs Nonaccrual [Member]	Dec. 31, 2012 Consumer, excluding credit card Prime Mortgages, Including Option ARMs Nonaccrual [Member]	Jun. 30, 2013 Consumer, excluding credit card Prime Mortgages, Including Option ARMs Regulatory Guidance Regarding Chapter 7 Loans [Member] loans	Jun. 30, 2013 Consumer, excluding credit card Prime Mortgages, Including Option ARMs Regulatory Guidance Regarding Prime, including Option ARM, mortgages [Member] Nonaccrual [Member]	Jun. 30, 2013 Consumer, excluding credit card Subprime Mortgages	Jun. 30, 2012 Consumer, excluding credit card Subprime Mortgages	Jun. 30, 2013 Consumer, excluding credit card Subprime Mortgages	Jun. 30, 2012 Consumer, excluding credit card Subprime Mortgages	Dec. 31, 2012 Consumer, excluding credit card Subprime Mortgages	Jun. 30, 2013 Consumer, excluding credit card Subprime Mortgages Trial Modification [Member] loans	Jun. 30, 2012 Consumer, excluding credit card Subprime Mortgages Trial Modification [Member] loans	Jun. 30, 2013 Consumer, excluding credit card Subprime Mortgages Trial Modification [Member] loans	Jun. 30, 2012 Consumer, excluding credit card Subprime Mortgages Trial Modification [Member] loans	Jun. 30, 2013 Consumer, excluding credit card Subprime Mortgages Permanent Modification [Member] loans years	Jun. 30, 2012 Consumer, excluding credit card Subprime Mortgages Permanent Modification [Member] loans years	Jun. 30, 2013 Consumer, excluding credit card Subprime Mortgages Permanent Modification [Member] loans years	Jun. 30, 2012 Consumer, excluding credit card Subprime Mortgages Permanent Modification [Member] years loans	Jun. 30, 2013 Consumer, excluding credit card Subprime Mortgages Nonaccrual [Member]	Dec. 31, 2012 Consumer, excluding credit card Subprime Mortgages Nonaccrual [Member]	Jun. 30, 2013 Consumer, excluding credit card Subprime Mortgages Regulatory Guidance Regarding Chapter 7 Loans [Member] loans	Jun. 30, 2013 Consumer, excluding credit card Subprime Mortgages Regulatory Guidance Regarding Chapter 7 Loans [Member] Nonaccrual [Member]	Jun. 30, 2013 Consumer, excluding credit card Other Consumer [Member]	Jun. 30, 2012 Consumer, excluding credit card Other Consumer [Member]	Jun. 30, 2013 Consumer, excluding credit card Other Consumer [Member]	Jun. 30, 2012 Consumer, excluding credit card Other Consumer [Member]	Dec. 31, 2012 Consumer, excluding credit card Other Consumer [Member]	Jun. 30, 2013 Consumer, excluding credit card Other Consumer [Member] Nonaccrual [Member]	Dec. 31, 2012 Consumer, excluding credit card Other Consumer [Member] Nonaccrual [Member]	Jun. 30, 2013 Consumer, excluding credit card Auto Loans	Jun. 30, 2012 Consumer, excluding credit card Auto Loans	Jun. 30, 2013 Consumer, excluding credit card Auto Loans	Jun. 30, 2012 Consumer, excluding credit card Auto Loans	Dec. 31, 2012 Consumer, excluding credit card Auto Loans	Jun. 30, 2013 Consumer, excluding credit card Auto Loans Maximum	Jun. 30, 2013 Consumer, excluding credit card Auto Loans Nonaccrual [Member]	Dec. 31, 2012 Consumer, excluding credit card Auto Loans Nonaccrual [Member]	Jun. 30, 2013 Consumer, excluding credit card Auto Loans Regulatory Guidance Regarding Chapter 7 Loans [Member] Nonaccrual [Member]	Jun. 30, 2013 Consumer, excluding credit card Business Banking Loans years	Jun. 30, 2012 Consumer, excluding credit card Business Banking Loans years	Jun. 30, 2013 Consumer, excluding credit card Business Banking Loans years	Jun. 30, 2012 Consumer, excluding credit card Business Banking Loans years	Dec. 31, 2012 Consumer, excluding credit card Business Banking Loans	Jun. 30, 2013 Consumer, excluding credit card Business Banking Loans Maximum	Jun. 30, 2013 Consumer, excluding credit card Business Banking Loans Nonaccrual [Member]	Dec. 31, 2012 Consumer, excluding credit card Business Banking Loans Nonaccrual [Member]	Jun. 30, 2013 Consumer, excluding credit card Scored Auto and Business Banking Loans [Member] loan_payment	Jun. 30, 2013 Consumer, excluding credit card Residential Real Estate [Member] loan_payment	Jun. 30, 2013 Credit card	Dec. 31, 2012 Credit card	Jun. 30, 2012 Credit card	Jun. 30, 2013 Credit card Credit Card Loan	Jun. 30, 2012 Credit card Credit Card Loan	Jun. 30, 2013 Credit card Credit Card Loan loan_payment	Jun. 30, 2012 Credit card Credit Card Loan	Dec. 31, 2012 Credit card Credit Card Loan	Jun. 30, 2013 Credit card Credit Card Loan Credit Card Loan Modification Programs, Total [Member]	Jun. 30, 2012 Credit card Credit Card Loan Credit Card Loan Modification Programs, Total [Member]	Jun. 30, 2013 Credit card Credit Card Loan Credit Card Loan Modification Programs, Total [Member]	Jun. 30, 2012 Credit card Credit Card Loan Credit Card Loan Modification Programs, Total [Member]	Jun. 30, 2013 Credit card Credit Card Loan Short-Term Credit Card Loan Modification Programs [Member]	Jun. 30, 2012 Credit card Credit Card Loan Short-Term Credit Card Loan Modification Programs [Member]	Jun. 30, 2013 Credit card Credit Card Loan Short-Term Credit Card Loan Modification Programs [Member]	Jun. 30, 2012 Credit card Credit Card Loan Short-Term Credit Card Loan Modification Programs [Member]	Jun. 30, 2013 Credit card Credit Card Loan Long-Term Credit Card Loan Modification Programs [Member]	Jun. 30, 2012 Credit card Credit Card Loan Long-Term Credit Card Loan Modification Programs [Member]	Jun. 30, 2013 Credit card Credit Card Loan Long-Term Credit Card Loan Modification Programs [Member]	Jun. 30, 2012 Credit card Credit Card Loan Long-Term Credit Card Loan Modification Programs [Member]	Jun. 30, 2013 Credit card Credit Card Loan Maximum	Jun. 30, 2013 Credit card Credit Card Loan Days Past Due, 30 or More [Member]	Jun. 30, 2013 Credit card Credit Card Loan Nonaccrual [Member]	Dec. 31, 2012 Credit card Credit Card Loan Nonaccrual [Member]	Jun. 30, 2013 Wholesale	Dec. 31, 2012 Wholesale	Jun. 30, 2012 Wholesale	Jun. 30, 2013 Wholesale Wholesale Loan [Member] years	Jun. 30, 2012 Wholesale Wholesale Loan [Member] years	Jun. 30, 2013 Wholesale Wholesale Loan [Member] years	Jun. 30, 2012 Wholesale Wholesale Loan [Member] years	Dec. 31, 2012 Wholesale Wholesale Loan [Member]	Jun. 30, 2013 Wholesale Wholesale Loan [Member] Nonaccrual [Member]	Dec. 31, 2012 Wholesale Wholesale Loan [Member] Nonaccrual [Member]	Jun. 30, 2012 Wholesale Wholesale Loan [Member] Nonaccrual [Member]	Jun. 30, 2013 Wholesale Commercial and Industrial [Member]	Jun. 30, 2012 Wholesale Commercial and Industrial [Member]	Jun. 30, 2013 Wholesale Commercial and Industrial [Member]	Jun. 30, 2012 Wholesale Commercial and Industrial [Member]	Dec. 31, 2012 Wholesale Commercial and Industrial [Member]	Jun. 30, 2013 Wholesale Commercial and Industrial [Member] Nonaccrual [Member]	Dec. 31, 2012 Wholesale Commercial and Industrial [Member] Nonaccrual [Member]	Jun. 30, 2012 Wholesale Commercial and Industrial [Member] Nonaccrual [Member]	Jun. 30, 2013 Wholesale Wholesale Real Estate [Member]	Jun. 30, 2012 Wholesale Wholesale Real Estate [Member]	Jun. 30, 2013 Wholesale Wholesale Real Estate [Member]	Jun. 30, 2012 Wholesale Wholesale Real Estate [Member]	Dec. 31, 2012 Wholesale Wholesale Real Estate [Member]	Jun. 30, 2013 Wholesale Wholesale Real Estate [Member] Nonaccrual [Member]	Dec. 31, 2012 Wholesale Wholesale Real Estate [Member] Nonaccrual [Member]	Jun. 30, 2012 Wholesale Wholesale Real Estate [Member] Nonaccrual [Member]	Jun. 30, 2013 Wholesale Financial Institutions, Government Agencies and Other Wholesale [Member]	Jun. 30, 2012 Wholesale Financial Institutions, Government Agencies and Other Wholesale [Member]	Jun. 30, 2013 Wholesale Financial Institutions, Government Agencies and Other Wholesale [Member]	Jun. 30, 2012 Wholesale Financial Institutions, Government Agencies and Other Wholesale [Member]	Jun. 30, 2013 Wholesale Financial Institutions, Government Agencies and Other Wholesale [Member] Nonaccrual [Member]	Jun. 30, 2012 Wholesale Financial Institutions, Government Agencies and Other Wholesale [Member] Nonaccrual [Member]	Jun. 30, 2013 Wholesale Financial Institutions [Member]	Dec. 31, 2012 Wholesale Financial Institutions [Member]	Jun. 30, 2013 Wholesale Financial Institutions [Member] Nonaccrual [Member]	Dec. 31, 2012 Wholesale Financial Institutions [Member] Nonaccrual [Member]	Jun. 30, 2013 Wholesale Government Agencies [Member]	Dec. 31, 2012 Wholesale Government Agencies [Member]	Jun. 30, 2013 Wholesale Government Agencies [Member] Nonaccrual [Member]	Dec. 31, 2012 Wholesale Government Agencies [Member] Nonaccrual [Member]	Jun. 30, 2013 Wholesale Wholesale Other [Member]	Dec. 31, 2012 Wholesale Wholesale Other [Member]	Jun. 30, 2013 Wholesale Wholesale Other [Member] Nonaccrual [Member]	Dec. 31, 2012 Wholesale Wholesale Other [Member] Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Number of Years Before Payment Default Under a Modified Loan																																																																																																																	1 year									1 year																									1 year
Number of Payments Past Due for Deemed Payment Default																																																																																																																													2	2						2
Number of Months Before a Payment Redefault Under Modified Loan															12 months
Loans Modified in Troubled Debt Restructurings [Abstract]
Financing Receivable, Modifications, Recorded Investment										$ 13,603,000,000	$ 10,898,000,000	$ 13,603,000,000	$ 10,898,000,000				$ 466,000,000	$ 474,000,000	$ 466,000,000	$ 474,000,000	$ 13,137,000,000	$ 10,424,000,000	$ 13,137,000,000	$ 10,424,000,000							$ 1,600,000,000		$ 1,160,000,000	$ 560,000,000	$ 1,160,000,000	$ 560,000,000		$ 43,000,000	$ 33,000,000	$ 43,000,000	$ 33,000,000	$ 1,117,000,000	$ 527,000,000	$ 1,117,000,000	$ 527,000,000				$ 470,000,000	$ 1,315,000,000	$ 762,000,000	$ 1,315,000,000	$ 762,000,000		$ 6,000,000	$ 6,000,000	$ 6,000,000	$ 6,000,000	$ 1,309,000,000	$ 756,000,000	$ 1,309,000,000	$ 756,000,000				$ 499,000,000	$ 7,303,000,000	$ 6,092,000,000	$ 7,303,000,000	$ 6,092,000,000		$ 268,000,000	$ 284,000,000	$ 268,000,000	$ 284,000,000	$ 7,035,000,000	$ 5,808,000,000	$ 7,035,000,000	$ 5,808,000,000				$ 430,000,000	$ 3,825,000,000	$ 3,484,000,000	$ 3,825,000,000	$ 3,484,000,000		$ 149,000,000	$ 151,000,000	$ 149,000,000	$ 151,000,000	$ 3,676,000,000	$ 3,333,000,000	$ 3,676,000,000	$ 3,333,000,000				$ 223,000,000	$ 448,000,000	$ 452,000,000	$ 448,000,000	$ 452,000,000		$ 263,000,000	$ 312,000,000	$ 124,000,000	$ 86,000,000	$ 124,000,000	$ 86,000,000			$ 90,000,000	$ 109,000,000	$ 57,000,000	$ 324,000,000	$ 366,000,000	$ 324,000,000	$ 366,000,000			$ 173,000,000	$ 203,000,000						$ 3,407,000,000		$ 3,407,000,000		$ 4,189,000,000																				$ 254,000,000	$ 615,000,000	$ 254,000,000	$ 615,000,000		$ 211,000,000		$ 458,000,000	$ 109,000,000	$ 464,000,000	$ 109,000,000	$ 464,000,000		$ 102,000,000		$ 341,000,000	$ 111,000,000	$ 121,000,000	$ 111,000,000	$ 121,000,000		$ 82,000,000		$ 88,000,000	$ 34,000,000	$ 30,000,000	$ 34,000,000	$ 30,000,000	$ 27,000,000	$ 29,000,000
Loans and Leases Receivable, Impaired, Troubled Debt Restructuring, Funded Commitment To Lend																																																																																																																																																										23,000,000	201,000,000	23,000,000	201,000,000					22,000,000	201,000,000	22,000,000	201,000,000					0	0	0	0					1,000,000	0	1,000,000	0
Loans Receivable Held for Investment, Net of Deferred Income	719,884,000,000	726,835,000,000	723,527,000,000		287,388,000,000	292,620,000,000	300,046,000,000	287,388,000,000	292,620,000,000	149,208,000,000		149,208,000,000		151,896,000,000											7,910,000,000	8,460,000,000							18,277,000,000		18,277,000,000		19,385,000,000									927,000,000	931,000,000			44,049,000,000		44,049,000,000		48,000,000,000									2,059,000,000	2,277,000,000			79,179,000,000		79,179,000,000		76,256,000,000									3,330,000,000	3,445,000,000			7,703,000,000		7,703,000,000		8,255,000,000									1,594,000,000	1,807,000,000			81,444,000,000		81,444,000,000		80,987,000,000	666,000,000	714,000,000	50,865,000,000		50,865,000,000		49,913,000,000		126,000,000	163,000,000		18,730,000,000		18,730,000,000		18,883,000,000		454,000,000	481,000,000			124,288,000,000	127,993,000,000	124,593,000,000	124,288,000,000		124,288,000,000		127,993,000,000															1,000,000	1,000,000	308,208,000,000	306,222,000,000	298,888,000,000	308,208,000,000		308,208,000,000		306,222,000,000	1,001,000,000	1,434,000,000		110,360,000,000		110,360,000,000		109,865,000,000	321,000,000	708,000,000		63,836,000,000		63,836,000,000		60,740,000,000	451,000,000	520,000,000								39,708,000,000	36,227,000,000	15,000,000	8,000,000	8,694,000,000	9,544,000,000	0	0	85,610,000,000	89,846,000,000	214,000,000	198,000,000
Loss Contingency, Settlement Agreement, Consideration				3,700,000,000
Loan Modification Program, Fixed Payment Plan Period																																																																																																																																																	60 months
Loans Modified in Troubled Debt Restructurings [Roll Forward]
Financing Receivable, Modifications, Recorded Investment, Beginning Balance										13,507,000,000	9,288,000,000	13,245,000,000	9,088,000,000																		1,600,000,000		1,155,000,000	338,000,000	1,092,000,000	335,000,000													470,000,000	1,286,000,000	706,000,000	1,223,000,000	657,000,000													499,000,000	7,223,000,000	5,018,000,000	7,118,000,000	4,877,000,000													430,000,000	3,843,000,000	3,226,000,000	3,812,000,000	3,219,000,000													223,000,000	481,000,000	469,000,000	502,000,000	503,000,000		263,000,000	312,000,000	140,000,000	91,000,000	150,000,000	88,000,000			90,000,000	109,000,000	57,000,000	341,000,000	378,000,000	352,000,000	415,000,000			173,000,000	203,000,000								4,189,000,000																						421,000,000	664,000,000	696,000,000	750,000,000		211,000,000		458,000,000	254,000,000	419,000,000	575,000,000	531,000,000		102,000,000		341,000,000	124,000,000	148,000,000	99,000,000	176,000,000		82,000,000		88,000,000	43,000,000	97,000,000	22,000,000	43,000,000	27,000,000	29,000,000
Financing Receivable, Modifications, New Troubled Debt Restructurings										540,000,000	1,895,000,000	1,214,000,000	2,406,000,000																				39,000,000	231,000,000	140,000,000	243,000,000														94,000,000	93,000,000	229,000,000	189,000,000														318,000,000	1,209,000,000	628,000,000	1,490,000,000														89,000,000	362,000,000	217,000,000	484,000,000														40,000,000	31,000,000	82,000,000	61,000,000				22,000,000	10,000,000	42,000,000	27,000,000						18,000,000	21,000,000	40,000,000	34,000,000															288,000,000	424,000,000	627,000,000	935,000,000	0	16,000,000	0	47,000,000	288,000,000	408,000,000	627,000,000	888,000,000								52,000,000	62,000,000	119,000,000	132,000,000					27,000,000	52,000,000	41,000,000	56,000,000					10,000,000	7,000,000	41,000,000	10,000,000					15,000,000	3,000,000	37,000,000	66,000,000
Financing Receivable, Impaired, Troubled Debt Restructuring, Increases to Existing Troubled Debt Restructurings																																																																																																																																																										1,000,000	19,000,000	4,000,000	20,000,000					1,000,000	19,000,000	4,000,000	20,000,000					0	0	0	0					0	0	0	0
Financing Receivable, Impaired, Troubled Debt Restructuring, Charge-offs Post-Modification										(73,000,000)	(79,000,000)	(173,000,000)	(186,000,000)																				(8,000,000)	(4,000,000)	(18,000,000)	(9,000,000)														(24,000,000)	(6,000,000)	(57,000,000)	(23,000,000)														(14,000,000)	(26,000,000)	(33,000,000)	(60,000,000)														(27,000,000)	(43,000,000)	(65,000,000)	(94,000,000)														(2,000,000)	(4,000,000)	(7,000,000)	(9,000,000)				(2,000,000)	(2,000,000)	(5,000,000)	(4,000,000)						0	(2,000,000)	(2,000,000)	(5,000,000)																																		0	(13,000,000)	(4,000,000)	(24,000,000)					0	(6,000,000)	(1,000,000)	(15,000,000)					0	0	(3,000,000)	(2,000,000)					0	(7,000,000)	0	(7,000,000)
Financing Receivable, Impaired, Troubled Debt Restructuring, Foreclosures and Other Liquidations										(70,000,000)	(53,000,000)	(132,000,000)	(122,000,000)																				(5,000,000)	0	(9,000,000)	0														(7,000,000)	(2,000,000)	(11,000,000)	(5,000,000)														(39,000,000)	(28,000,000)	(74,000,000)	(57,000,000)														(19,000,000)	(23,000,000)	(38,000,000)	(60,000,000)														0	0	0	0				0	0	0	0						0	0	0	0
Financing Receivable, Impaired, Troubled Debt Restructuring, Principal Payments, Sales, and Other										(301,000,000)	(153,000,000)	(551,000,000)	(288,000,000)																				(21,000,000)	(5,000,000)	(45,000,000)	(9,000,000)														(34,000,000)	(29,000,000)	(69,000,000)	(56,000,000)														(185,000,000)	(81,000,000)	(336,000,000)	(158,000,000)														(61,000,000)	(38,000,000)	(101,000,000)	(65,000,000)														(71,000,000)	(44,000,000)	(129,000,000)	(103,000,000)				(36,000,000)	(13,000,000)	(63,000,000)	(25,000,000)						(35,000,000)	(31,000,000)	(66,000,000)	(78,000,000)																																		(220,000,000)	(117,000,000)	(561,000,000)	(263,000,000)					(173,000,000)	(20,000,000)	(510,000,000)	(128,000,000)					(23,000,000)	(34,000,000)	(26,000,000)	(63,000,000)					(24,000,000)	(63,000,000)	(25,000,000)	(72,000,000)
Financing Receivables, Impaired, Troubled Debt Restructuring, Performing Loans Restructured at Market Rates but No Longer Reported as TDRs																																																																																																																																																										0	17,000,000	0	40,000,000
Financing Receivable, Modifications, Recorded Investment, Ending Balance										13,603,000,000	10,898,000,000	13,603,000,000	10,898,000,000				466,000,000	474,000,000	466,000,000	474,000,000	13,137,000,000	10,424,000,000	13,137,000,000	10,424,000,000							1,600,000,000		1,160,000,000	560,000,000	1,160,000,000	560,000,000		43,000,000	33,000,000	43,000,000	33,000,000	1,117,000,000	527,000,000	1,117,000,000	527,000,000				470,000,000	1,315,000,000	762,000,000	1,315,000,000	762,000,000		6,000,000	6,000,000	6,000,000	6,000,000	1,309,000,000	756,000,000	1,309,000,000	756,000,000				499,000,000	7,303,000,000	6,092,000,000	7,303,000,000	6,092,000,000		268,000,000	284,000,000	268,000,000	284,000,000	7,035,000,000	5,808,000,000	7,035,000,000	5,808,000,000				430,000,000	3,825,000,000	3,484,000,000	3,825,000,000	3,484,000,000		149,000,000	151,000,000	149,000,000	151,000,000	3,676,000,000	3,333,000,000	3,676,000,000	3,333,000,000				223,000,000	448,000,000	452,000,000	448,000,000	452,000,000		263,000,000	312,000,000	124,000,000	86,000,000	124,000,000	86,000,000			90,000,000	109,000,000	57,000,000	324,000,000	366,000,000	324,000,000	366,000,000			173,000,000	203,000,000						3,407,000,000		3,407,000,000		4,189,000,000																				254,000,000	615,000,000	254,000,000	615,000,000		211,000,000		458,000,000	109,000,000	464,000,000	109,000,000	464,000,000		102,000,000		341,000,000	111,000,000	121,000,000	111,000,000	121,000,000		82,000,000		88,000,000	34,000,000	30,000,000	34,000,000	30,000,000	27,000,000	29,000,000
Nature and Extent of Modifications [Abstract]
Mortgage Loans on Real Estate, Number of Loans																											38,900																					9,400																	22,500																	3,500																	3,500
Financing Receivable, Modifications, Number of Contract Modifications that Occurred																	2,713	2,722	5,874	5,505	4,353	12,923	9,379	17,109														562	468	1,062	839	405	2,467	950	2,697										172	173	368	421	1,353	2,048	2,669	3,864										856	941	1,832	1,913	1,137	3,754	2,613	4,704										1,123	1,140	2,612	2,332	1,458	4,654	3,147	5,844
Financing Receivable, Modifications, Percentage of Modifications that Occurred, Interest Rate Reductions										76.00%	80.00%	77.00%	82.00%																				70.00%	90.00%	72.00%	88.00%														85.00%	85.00%	88.00%	90.00%														73.00%	88.00%	74.00%	86.00%														72.00%	67.00%	71.00%	70.00%
Financing Receivable, Modifications, Percentage of Modifications that Occurred, Term Or Payment Extension										66.00%	46.00%	66.00%	51.00%																				73.00%	30.00%	73.00%	35.00%														76.00%	84.00%	77.00%	76.00%														69.00%	58.00%	69.00%	61.00%														53.00%	28.00%	51.00%	34.00%
Financing Receivable, Modifications, Percentage of Modifications that Occurred, Principal And Interest Deferred										20.00%	8.00%	19.00%	11.00%																				11.00%	3.00%	10.00%	4.00%														25.00%	16.00%	24.00%	18.00%														29.00%	11.00%	28.00%	17.00%														12.00%	5.00%	11.00%	6.00%
Financing Receivable, Modifications, Percentage of Modifications that Occurred, Principal Forgiveness										39.00%	18.00%	43.00%	18.00%																				37.00%	1.00%	38.00%	3.00%														33.00%	12.00%	36.00%	10.00%														39.00%	9.00%	40.00%	12.00%														46.00%	37.00%	52.00%	36.00%
Financing Receivable, Modifications, Percentage of Modifications that Occurred, Other										11.00%	14.00%	12.00%	11.00%																				0.00%	0.00%	0.00%	0.00%														0.00%	0.00%	0.00%	0.00%														24.00%	40.00%	24.00%	33.00%														13.00%	7.00%	15.00%	6.00%
Percentage, Sum of Items by Type, May Exceed												100.00%
Financial Effects of Modifications and Redefaults [Abstract]
Financing Receivable, Modifications, Pre-Modification, Weighted-Average Interest Rate Of Loans With Rate Reductions																					5.76%	6.73%	5.99%	6.70%																		6.78%	7.32%	6.53%	7.30%														5.10%	5.77%	5.14%	5.72%														5.09%	6.37%	5.37%	6.28%														7.26%	7.55%	7.48%	7.75%												13.46%	12.55%	13.19%	10.99%						7.58%	8.24%	7.94%	8.14%										15.38%	15.25%	15.44%	15.91%
Financing Receivable, Modifications, Post-Modification, Weighted-Average Interest Rate Of Loans With Rate Reductions																					2.94%	4.25%	2.98%	3.91%																		3.34%	4.91%	3.44%	4.79%														2.28%	2.07%	2.22%	1.89%														2.78%	4.22%	2.83%	3.89%														3.50%	4.56%	3.54%	4.36%												4.82%	5.10%	4.94%	4.71%						6.16%	6.03%	5.84%	6.07%										4.27%	5.17%	4.88%	5.36%
Financing Receivable, Modifications, Pre-Modification, Weighted-Average Remaining Term																																																																																																																					1.6	0.7	1.5	1.0
Financing Receivable, Modifications, Pre-Modification, Weighted-Average Remaining Term of Financing Receivables With Term Or Payment Extensions																					24	24	23	25																		17	19	18	19														19	21	19	21														25	25	24	26														24	24	24	25
Financing Receivable, Modifications, Average Term or Payment Extension Granted																																																																																																																																																										0.9	1.3	2.1	1.3
Financing Receivable, Modifications, Post-Modification, Weighted-Average Remaining Term																																																																																																																					3.8	1.9	3.1	2.5																																		1.4	2.8	1.6	3.6
Financing Receivable, Modifications, Post-Modification, Weighted-Average Remaining Term of Financing Receivables With Term Or Payment Extensions																					36	33	35	34																		31	30	31	29														34	32	34	32														37	35	37	35														35	32	34	32
Financing Receivable, Modifications, Weighted-Average Remaining Life																																										6		6															7		7															10		10															8		8
Financing Receivable, Impaired, Troubled Debt Restructuring, Write-down																					34,000,000	23,000,000	63,000,000	49,000,000																		2,000,000	1,000,000	4,000,000	2,000,000														23,000,000	6,000,000	42,000,000	12,000,000														6,000,000	9,000,000	11,000,000	23,000,000														3,000,000	7,000,000	6,000,000	12,000,000
Financing Receivable, Modifications, Principal Deferred																					51,000,000	61,000,000	105,000,000	113,000,000																		1,000,000	1,000,000	3,000,000	2,000,000														7,000,000	6,000,000	14,000,000	12,000,000														32,000,000	40,000,000	67,000,000	75,000,000														11,000,000	14,000,000	21,000,000	24,000,000
Financing Receivable, Modifications, Principal Forgiven																					132,000,000	159,000,000	315,000,000	216,000,000																		7,000,000	1,000,000	17,000,000	3,000,000														13,000,000	7,000,000	29,000,000	11,000,000														57,000,000	33,000,000	130,000,000	53,000,000														55,000,000	118,000,000	139,000,000	149,000,000
Financing Receivable, Modifications, Subsequent Default Occurred, Number of Contracts																					849	1,109	1,846	2,055																		95	84	226	140														248	356	594	724														189	232	397	458														317	437	629	733
Financing Receivable, Modifications, Subsequent Default Occurred, Recorded Investment																					$ 98,000,000	$ 137,000,000	$ 197,000,000	$ 247,000,000																		$ 7,000,000	$ 6,000,000	$ 17,000,000	$ 10,000,000														$ 6,000,000	$ 12,000,000	$ 13,000,000	$ 26,000,000														$ 54,000,000	$ 72,000,000	$ 104,000,000	$ 130,000,000														$ 31,000,000	$ 47,000,000	$ 63,000,000	$ 81,000,000												$ 15,000,000	$ 7,000,000	$ 28,000,000	$ 14,000,000						$ 11,000,000	$ 14,000,000	$ 23,000,000	$ 25,000,000										$ 41,000,000	$ 81,000,000	$ 85,000,000	$ 178,000,000																					$ 1,000,000	$ 5,000,000	$ 1,000,000	$ 52,000,000
Financing Receivable, Trial Modifications Successfully Converted to Permanent Modifications																85.00%
Rate of Default for Modified Loans, Estimated Weighted Average																												40.00%	10.00%															19.00%								18.00%																										14.00%																	24.00%																																					33.54%		38.23%
Percentage of Loans Thirty Plus Days Past Due to Total Retained Loans										3.60%		3.60%		4.28%																			3.51%		3.51%		3.60%											21.00%		2.05%		2.05%		2.49%											13.00%		3.19%		3.19%		3.97%											38.00%		16.97%		16.97%		19.16%											28.00%		1.43%		1.43%		1.58%			0.95%		0.95%		1.25%					2.25%		2.25%		2.12%									1.69%		1.69%		2.10%
Period Past Due, Credit Analysis Factors, Charge off Criteria																														30 days		60 days																				180 days
Loans, Charge-off Criteria, Period Past Due																																																																																																																																																				30 days