Fair Value Election and Measurement Level 3 Significant Unobservable Input Assumptions (Details) (USD $) In Millions, unless otherwise specified																																																																									9 Months Ended
	Sep. 30, 2012		Dec. 31, 2011		Sep. 30, 2012 Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Mortgage-backed Securities, Issued by Private Enterprises [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Mortgage-backed Securities, Issued by Private Enterprises [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Collateralized Debt Obligations [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Collateralized Debt Obligations [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Asset-backed Securities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Asset-backed Securities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 US States and Political Subdivisions Debt Securities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 US States and Political Subdivisions Debt Securities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Corporate And Other Debt Securities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Corporate And Other Debt Securities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Residential Mortgage, Loans Held For Sale [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Residential Mortgage, Loans Held For Sale [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Residential Mortgage, Loans Held For Sale [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Residential Mortgage, Loans Held For Sale [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Derivative Financial Instruments, Liabilities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Derivative Financial Instruments, Liabilities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Available-for-sale Securities [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Available-for-sale Securities [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Available-for-sale Securities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Available-for-sale Securities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Available-for-sale Securities [Member] Mortgage-backed Securities, Issued by Private Enterprises [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Available-for-sale Securities [Member] Mortgage-backed Securities, Issued by Private Enterprises [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Available-for-sale Securities [Member] Mortgage-backed Securities, Issued by Private Enterprises [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Available-for-sale Securities [Member] Mortgage-backed Securities, Issued by Private Enterprises [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Available-for-sale Securities [Member] Collateralized Debt Obligations [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Available-for-sale Securities [Member] Collateralized Debt Obligations [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Available-for-sale Securities [Member] Asset-backed Securities [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Available-for-sale Securities [Member] Asset-backed Securities [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Available-for-sale Securities [Member] Asset-backed Securities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Available-for-sale Securities [Member] Asset-backed Securities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Available-for-sale Securities [Member] US States and Political Subdivisions Debt Securities [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Available-for-sale Securities [Member] US States and Political Subdivisions Debt Securities [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Available-for-sale Securities [Member] US States and Political Subdivisions Debt Securities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Available-for-sale Securities [Member] US States and Political Subdivisions Debt Securities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Available-for-sale Securities [Member] Corporate And Other Debt Securities [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Available-for-sale Securities [Member] Corporate And Other Debt Securities [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Available-for-sale Securities [Member] Corporate And Other Debt Securities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Available-for-sale Securities [Member] Corporate And Other Debt Securities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Available-for-sale Securities [Member] Equity Securities, Other [Member] Fair Value, Measurements, Recurring [Member]		Dec. 31, 2011 Available-for-sale Securities [Member] Equity Securities, Other [Member] Fair Value, Measurements, Recurring [Member]		Sep. 30, 2012 Available-for-sale Securities [Member] Equity Securities, Other [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]		Dec. 31, 2011 Available-for-sale Securities [Member] Equity Securities, Other [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]		Sep. 30, 2012 Market Approach Valuation Technique [Member] Mortgage-backed Securities, Issued by Private Enterprises [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Market Approach Valuation Technique [Member] Asset-backed Securities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Market Approach Valuation Technique [Member] Loans Held For Investment [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Market Approach Valuation Technique [Member] Other Assets And Liabilities, Net [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]		Sep. 30, 2012 Market Approach Valuation Technique [Member] Available-for-sale Securities [Member] Mortgage-backed Securities, Issued by Private Enterprises [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Market Approach Valuation Technique [Member] Available-for-sale Securities [Member] Asset-backed Securities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Market Approach Valuation Technique [Member] Available-for-sale Securities [Member] US States and Political Subdivisions Debt Securities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Cost Approach Valuation Technique [Member] Available-for-sale Securities [Member] Corporate And Other Debt Securities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Cost Approach Valuation Technique [Member] Available-for-sale Securities [Member] Equity Securities, Other [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Income Approach Valuation Technique [Member] Collateralized Debt Obligations [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Income Approach Valuation Technique [Member] Residential Mortgage, Loans Held For Sale [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Income Approach Valuation Technique [Member] Loans Held For Investment [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Income Approach Valuation Technique [Member] Mortgage Servicing Rights Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Income Approach Valuation Technique [Member] Other Assets And Liabilities, Net [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]		Sep. 30, 2012 Income Approach Valuation Technique [Member] Other Liabilities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]		Sep. 30, 2012 Lower Limit Market Approach Valuation Technique [Member] Collateralized Debt Obligations [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Lower Limit Market Approach Valuation Technique [Member] Asset-backed Securities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Lower Limit Market Approach Valuation Technique [Member] Other Assets And Liabilities, Net [Member]	Sep. 30, 2012 Lower Limit Market Approach Valuation Technique [Member] Available-for-sale Securities [Member] US States and Political Subdivisions Debt Securities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Lower Limit Income Approach Valuation Technique [Member] Residential Mortgage, Loans Held For Sale [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Lower Limit Income Approach Valuation Technique [Member] Loans Held For Investment [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Lower Limit Income Approach Valuation Technique [Member] Mortgage Servicing Rights Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Lower Limit Income Approach Valuation Technique [Member] Other Assets And Liabilities, Net [Member]	Sep. 30, 2012 Upper Limit Market Approach Valuation Technique [Member] Collateralized Debt Obligations [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Upper Limit Market Approach Valuation Technique [Member] Asset-backed Securities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Upper Limit Market Approach Valuation Technique [Member] Other Assets And Liabilities, Net [Member]	Sep. 30, 2012 Upper Limit Market Approach Valuation Technique [Member] Available-for-sale Securities [Member] US States and Political Subdivisions Debt Securities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Upper Limit Income Approach Valuation Technique [Member] Residential Mortgage, Loans Held For Sale [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Upper Limit Income Approach Valuation Technique [Member] Loans Held For Investment [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Upper Limit Income Approach Valuation Technique [Member] Mortgage Servicing Rights Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Upper Limit Income Approach Valuation Technique [Member] Other Assets And Liabilities, Net [Member]	Sep. 30, 2012 Weighted Average [Member] Market Approach Valuation Technique [Member] Collateralized Debt Obligations [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Weighted Average [Member] Market Approach Valuation Technique [Member] Asset-backed Securities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Weighted Average [Member] Market Approach Valuation Technique [Member] Other Assets And Liabilities, Net [Member]	Sep. 30, 2012 Weighted Average [Member] Market Approach Valuation Technique [Member] Available-for-sale Securities [Member] US States and Political Subdivisions Debt Securities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Weighted Average [Member] Income Approach Valuation Technique [Member] Residential Mortgage, Loans Held For Sale [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Weighted Average [Member] Income Approach Valuation Technique [Member] Loans Held For Investment [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Weighted Average [Member] Income Approach Valuation Technique [Member] Mortgage Servicing Rights Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Weighted Average [Member] Income Approach Valuation Technique [Member] Other Assets And Liabilities, Net [Member]
level 3 fair value assumptions [Line Items]
Trading Account Assets, Fair Value Disclosure					$ 6,381	$ 6,279	$ 53	$ 49	$ 1	$ 1	$ 47	$ 43	$ 5	$ 5	$ 0	$ 0	$ 0	$ 0																																					$ 1	$ 5									$ 47
Investments, Fair Value Disclosure																									21,467	28,117	1,126	1,041	217	221	217	221	50	0	261	464	18	16	355	454	51	58	46	51	5	5	976	[1]	929	[2]	835	[1]	741	[2]						217	18	51	5	835
Loans Held-for-sale, Fair Value Disclosure	3,222	[3]	2,141	[3]	3,222	2,141	4	1											2,894	1,826	4	1																																												4
Loans, Held for Investment, Fair Value Disclosure					390	433	390	433																																																	14										376
Intangible Assets, Fair Value Disclosure					831	921	831	921																																																												831
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liabilities																																																										198	[4]										(24)	[4]	(7)	[4]
Trading Liabilities, Fair Value Disclosure					1,458	1,806	0	189									0	0					0	189
Fair Value Inputs, Discount Rate, Variable Spread																																																																									29								45								38
Fair Value Inputs, Expected Collateral Losses																																																																									37.00%								50.00%								41.00%
Fair Value Inputs, Indicative Pricing																																																																										$ 45		$ 72						$ 45		$ 115						$ 45		$ 101
Fair Value Inputs, Option Adjusted Spread																																																																													0.00%	0.00%							3.00%	3.00%							0.66%	0.66%
Fair Value Inputs, Conditional Prepayment Rate																																																																													0.00%	0.00%	6.00%						36.00%	36.00%	35.00%						23.00%	23.00%	19.00%
Fair Value Inputs, Probability of Default																																																																													0.00%	0.00%							25.00%	25.00%							7.00%	7.00%
Fair Value Inputs, Discount Rate																																																																															8.00%								28.00%								11.00%
Fair Value Inputs, Pull Through Rate																																																																											5.00%								98.00%								67.00%
Fair Value Inputs, Msr Value																																																																											0.02%								2.34%								0.89%
fair value inputs, loan production volume																																																																																0.00%								150.00%								92.00%

[1] Includes at cost, $432 million of FHLB of Atlanta stock, $401 million of Federal Reserve Bank stock, and $141 million in mutual fund investments.

[2] Includes at cost, $342 million of FHLB of Atlanta stock, $398 million of Federal Reserve Bank stock, and $187 million in mutual fund investments.

[3] 1 Includes loans held for sale, at fair value, of consolidated VIEs328 315

[4] Input assumptions relate to the Company's IRLCs and the contingent consideration obligation related to an acquisition. Excludes $1 million of Other Liabilities. Refer to Note 11, "Reinsurance Arrangements and Guarantees," for additional information.