Fair Value Election and Measurement Level 3 Significant Unobservable Input Assumptions (Details) (USD $) In Millions, unless otherwise specified																																																																									3 Months Ended
	Mar. 31, 2012		Dec. 31, 2011		Mar. 31, 2012 Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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]	Dec. 31, 2011 Corporate And Other Debt Securities [Member] Fair Value, Measurements, Recurring [Member]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 2012 Available-for-sale Securities [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Available-for-sale Securities [Member] Fair Value, Measurements, Recurring [Member]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 2012 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, Measurements, Recurring [Member]	Mar. 31, 2012 Available-for-sale Securities [Member] Collateralized Debt Obligations [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, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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]		Mar. 31, 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]		Mar. 31, 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]	Mar. 31, 2012 Market Approach Valuation Technique [Member] Asset-backed Securities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Mar. 31, 2012 Market Approach Valuation Technique [Member] Loans Held For Investment [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Mar. 31, 2012 Market Approach Valuation Technique [Member] Other Assets And Liabilities, Net [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]		Mar. 31, 2012 Market Approach Valuation Technique [Member] Derivative Financial Instruments, Liabilities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 2012 Income Approach Valuation Technique [Member] Collateralized Debt Obligations [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Mar. 31, 2012 Income Approach Valuation Technique [Member] Residential Mortgage, Loans Held For Sale [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Mar. 31, 2012 Income Approach Valuation Technique [Member] Loans Held For Investment [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Mar. 31, 2012 Income Approach Valuation Technique [Member] Mortgage Servicing Rights Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Mar. 31, 2012 Lower Limit Market Approach Valuation Technique [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Mar. 31, 2012 Lower Limit Market Approach Valuation Technique [Member] Collateralized Debt Obligations [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Mar. 31, 2012 Lower Limit Market Approach Valuation Technique [Member] Asset-backed Securities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Mar. 31, 2012 Lower Limit Market Approach Valuation Technique [Member] Other Assets And Liabilities, Net [Member]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 2012 Lower Limit Income Approach Valuation Technique [Member] Loans Held For Investment [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Mar. 31, 2012 Lower Limit Income Approach Valuation Technique [Member] Mortgage Servicing Rights Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Mar. 31, 2012 Upper Limit Market Approach Valuation Technique [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Mar. 31, 2012 Upper Limit Market Approach Valuation Technique [Member] Collateralized Debt Obligations [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Mar. 31, 2012 Upper Limit Market Approach Valuation Technique [Member] Asset-backed Securities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Mar. 31, 2012 Upper Limit Market Approach Valuation Technique [Member] Other Assets And Liabilities, Net [Member]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 2012 Upper Limit Income Approach Valuation Technique [Member] Loans Held For Investment [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Mar. 31, 2012 Upper Limit Income Approach Valuation Technique [Member] Mortgage Servicing Rights Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Mar. 31, 2012 Weighted Average [Member] Market Approach Valuation Technique [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Mar. 31, 2012 Weighted Average [Member] Market Approach Valuation Technique [Member] Collateralized Debt Obligations [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Mar. 31, 2012 Weighted Average [Member] Market Approach Valuation Technique [Member] Asset-backed Securities [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Mar. 31, 2012 Weighted Average [Member] Market Approach Valuation Technique [Member] Other Assets And Liabilities, Net [Member]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 2012 Weighted Average [Member] Income Approach Valuation Technique [Member] Mortgage Servicing Rights Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]
level 3 fair value assumptions [Line Items]
Trading Account Assets, Fair Value Disclosure					$ 6,316	$ 6,279	$ 49	$ 49	$ 1	$ 1	$ 43	$ 43	$ 5	$ 5	$ 0	$ 0		$ 0	$ 0																																							$ 1	$ 5										$ 43
Investments, Fair Value Disclosure																										27,323	28,117	1,126	1,041	216	221	216	221	43	50	0	0	401	464	17	16	419	454	57	58	46	51	5	5	1,033	[1]	929	[2]	831	[1]	741	[2]							216	17	57	5	831
Loans Held-for-sale, Fair Value Disclosure	2,207	[3]	2,141	[3]	2,207	2,141	4	1												1,881	1,826	4	1																																															4
Loans, Held for Investment, Fair Value Disclosure					413	433	413	433																																																				23											390
Intangible Assets, Fair Value Disclosure					1,070	921	1,070	921																																																																1,070
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liabilities																																																													96	[4]
Trading Liabilities, Fair Value Disclosure					$ 1,554	$ 1,806	$ 246	$ 189									$ 77	$ 0	$ 0					$ 246	$ 189																																						$ 246
Fair Value Inputs, Discount Rate, Variable Spread																																																																										8.00%								11.00%								8.95%
Fair Value Inputs, Expected Collateral Losses																																																																										42.00%								49.00%								45.00%
Fair Value Inputs, Indicative Pricing																																																																											0.45%		0.72%						0.45%		1.16%						0.45%		0.89%
Fair Value Inputs, Option Adjusted Spread																																																																														0.00%	0.00%							2.75%	2.75%							1.16%	1.16%
Fair Value Inputs, Conditional Prepayment Rate																																																																														0.00%	0.00%							36.00%	36.00%							23.00%	23.00%
Fair Value Inputs, Probability of Default																																																																														0.00%	0.00%							25.00%	25.00%							7.00%	7.00%
Fair Value Inputs, Loss Severity																																																																									0.00%								0.00%								0.00%
Fair Value Inputs, Prepayment Rate																																																																																6.00%								30.00%								15.20%
Fair Value Inputs, Discount Rate																																																																																8.00%								28.00%								11.00%
Fair Value Inputs, Pull Through Rate																																																																												1.11%								99.33%								65.05%
Fair Value Inputs, Msr Value																																																																												0.02%								1.99%								1.15%

[1] Includes at cost, $432 million of FHLB of Atlanta stock, $398 million of Federal Reserve Bank stock, and $202 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] Includes loans held for sale, at fair value, of consolidated VIEs326 315

[4] nput assumptions relate to the Company's IRLCs. Excludes $5 million of Other Liabilities. Refer to Note 11, "Reinsurance Arrangements and Guarantees," for additional information.