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Fair Value Measurements (Assets And Liabilities Recorded At Fair Value On A Recurring Basis) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Auction-Rate Debt Securities [Member]
      
Investment securities available-for-sale $ 432 [1] $ 609 [1] $ 901 [1]
Fair Value, Measurements, Recurring [Member]
      
Trading securities 115 118  
Investment securities available-for-sale 10,104 7,560  
Derivative assets 760 703  
Total assets at fair value 10,979 8,381  
Derivative liabilities 409 401  
Deferred compensation plan liabilities 90 86  
Total liabilities at fair value 499 487  
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
      
Trading securities 91 86  
Investment securities available-for-sale 113 215  
Derivative assets 0 0  
Total assets at fair value 204 301  
Derivative liabilities 0 0  
Deferred compensation plan liabilities 90 86  
Total liabilities at fair value 90 86  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
      
Trading securities 24 31  
Investment securities available-for-sale 9,558 6,734  
Derivative assets 757 696  
Total assets at fair value 10,339 7,461  
Derivative liabilities 403 400  
Deferred compensation plan liabilities 0 0  
Total liabilities at fair value 403 400  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
      
Trading securities 0 1  
Investment securities available-for-sale 433 611  
Derivative assets 3 7  
Total assets at fair value 436 619  
Derivative liabilities 6 1  
Deferred compensation plan liabilities 0 0  
Total liabilities at fair value 6 1  
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member]
      
Derivative assets 602 542  
Derivative liabilities 253 249  
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member] | Level 1 [Member]
      
Derivative assets 0 0  
Derivative liabilities 0 0  
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member] | Level 2 [Member]
      
Derivative assets 602 542  
Derivative liabilities 253 249  
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member] | Level 3 [Member]
      
Derivative assets 0 0  
Derivative liabilities 0 0  
Fair Value, Measurements, Recurring [Member] | Energy Derivative Contracts [Member]
      
Derivative assets 115 103  
Derivative liabilities 115 103  
Fair Value, Measurements, Recurring [Member] | Energy Derivative Contracts [Member] | Level 1 [Member]
      
Derivative assets 0 0  
Derivative liabilities 0 0  
Fair Value, Measurements, Recurring [Member] | Energy Derivative Contracts [Member] | Level 2 [Member]
      
Derivative assets 115 103  
Derivative liabilities 115 103  
Fair Value, Measurements, Recurring [Member] | Energy Derivative Contracts [Member] | Level 3 [Member]
      
Derivative assets 0 0  
Derivative liabilities 0 0  
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contracts [Member]
      
Derivative assets 40 51  
Derivative liabilities 35 48  
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contracts [Member] | Level 1 [Member]
      
Derivative assets 0 0  
Derivative liabilities 0 0  
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contracts [Member] | Level 2 [Member]
      
Derivative assets 40 51  
Derivative liabilities 35 48  
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contracts [Member] | Level 3 [Member]
      
Derivative assets 0 0  
Derivative liabilities 0 0  
Fair Value, Measurements, Recurring [Member] | Warrants [Member]
      
Derivative assets 3 7  
Fair Value, Measurements, Recurring [Member] | Warrants [Member] | Level 1 [Member]
      
Derivative assets 0 0  
Fair Value, Measurements, Recurring [Member] | Warrants [Member] | Level 2 [Member]
      
Derivative assets 0 0  
Fair Value, Measurements, Recurring [Member] | Warrants [Member] | Level 3 [Member]
      
Derivative assets 3 7  
Fair Value, Measurements, Recurring [Member] | Other Derivative Liabilities [Member]
      
Derivative liabilities 6 1  
Fair Value, Measurements, Recurring [Member] | Other Derivative Liabilities [Member] | Level 1 [Member]
      
Derivative liabilities 0 0  
Fair Value, Measurements, Recurring [Member] | Other Derivative Liabilities [Member] | Level 2 [Member]
      
Derivative liabilities 0 0  
Fair Value, Measurements, Recurring [Member] | Other Derivative Liabilities [Member] | Level 3 [Member]
      
Derivative liabilities 6 1  
Fair Value, Measurements, Recurring [Member] | U.S. Treasury and Other U.S. Government Agency Securities [Member]
      
Investment securities available-for-sale 20 131  
Fair Value, Measurements, Recurring [Member] | U.S. Treasury and Other U.S. Government Agency Securities [Member] | Level 1 [Member]
      
Investment securities available-for-sale 20 131  
Fair Value, Measurements, Recurring [Member] | U.S. Treasury and Other U.S. Government Agency Securities [Member] | Level 2 [Member]
      
Investment securities available-for-sale 0 0  
Fair Value, Measurements, Recurring [Member] | U.S. Treasury and Other U.S. Government Agency Securities [Member] | Level 3 [Member]
      
Investment securities available-for-sale 0 0  
Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed Securities [Member]
      
Investment securities available-for-sale 9,512 [2] 6,709 [2]  
Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed Securities [Member] | Level 1 [Member]
      
Investment securities available-for-sale 0 [2] 0 [2]  
Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed Securities [Member] | Level 2 [Member]
      
Investment securities available-for-sale 9,512 [2] 6,709 [2]  
Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed Securities [Member] | Level 3 [Member]
      
Investment securities available-for-sale 0 [2] 0 [2]  
Fair Value, Measurements, Recurring [Member] | State And Municipal Securities [Member]
      
Investment securities available-for-sale 24 [3] 39 [3]  
Fair Value, Measurements, Recurring [Member] | State And Municipal Securities [Member] | Level 1 [Member]
      
Investment securities available-for-sale 0 [3] 0 [3]  
Fair Value, Measurements, Recurring [Member] | State And Municipal Securities [Member] | Level 2 [Member]
      
Investment securities available-for-sale 0 [3] 0 [3]  
Fair Value, Measurements, Recurring [Member] | State And Municipal Securities [Member] | Level 3 [Member]
      
Investment securities available-for-sale 24 [3] 39 [3]  
Fair Value, Measurements, Recurring [Member] | Auction-Rate Debt Securities [Member] | Corporate Debt Securities [Member]
      
Investment securities available-for-sale 1 1  
Fair Value, Measurements, Recurring [Member] | Auction-Rate Debt Securities [Member] | Corporate Debt Securities [Member] | Level 1 [Member]
      
Investment securities available-for-sale 0 0  
Fair Value, Measurements, Recurring [Member] | Auction-Rate Debt Securities [Member] | Corporate Debt Securities [Member] | Level 2 [Member]
      
Investment securities available-for-sale 0 0  
Fair Value, Measurements, Recurring [Member] | Auction-Rate Debt Securities [Member] | Corporate Debt Securities [Member] | Level 3 [Member]
      
Investment securities available-for-sale 1 1  
Fair Value, Measurements, Recurring [Member] | Other Corporate Debt Securities [Member] | Corporate Debt Securities [Member]
      
Investment securities available-for-sale 46 26  
Fair Value, Measurements, Recurring [Member] | Other Corporate Debt Securities [Member] | Corporate Debt Securities [Member] | Level 1 [Member]
      
Investment securities available-for-sale 0 0  
Fair Value, Measurements, Recurring [Member] | Other Corporate Debt Securities [Member] | Corporate Debt Securities [Member] | Level 2 [Member]
      
Investment securities available-for-sale 46 25  
Fair Value, Measurements, Recurring [Member] | Other Corporate Debt Securities [Member] | Corporate Debt Securities [Member] | Level 3 [Member]
      
Investment securities available-for-sale 0 1  
Fair Value, Measurements, Recurring [Member] | Auction-Rate Preferred Securities [Member] | Equity And Other Non-Debt Securities [Member]
      
Investment securities available-for-sale 408 570  
Fair Value, Measurements, Recurring [Member] | Auction-Rate Preferred Securities [Member] | Equity And Other Non-Debt Securities [Member] | Level 1 [Member]
      
Investment securities available-for-sale 0 0  
Fair Value, Measurements, Recurring [Member] | Auction-Rate Preferred Securities [Member] | Equity And Other Non-Debt Securities [Member] | Level 2 [Member]
      
Investment securities available-for-sale 0 0  
Fair Value, Measurements, Recurring [Member] | Auction-Rate Preferred Securities [Member] | Equity And Other Non-Debt Securities [Member] | Level 3 [Member]
      
Investment securities available-for-sale 408 570  
Fair Value, Measurements, Recurring [Member] | Money Market And Other Mutual Funds [Member] | Equity And Other Non-Debt Securities [Member]
      
Investment securities available-for-sale 93 84  
Fair Value, Measurements, Recurring [Member] | Money Market And Other Mutual Funds [Member] | Equity And Other Non-Debt Securities [Member] | Level 1 [Member]
      
Investment securities available-for-sale 93 84  
Fair Value, Measurements, Recurring [Member] | Money Market And Other Mutual Funds [Member] | Equity And Other Non-Debt Securities [Member] | Level 2 [Member]
      
Investment securities available-for-sale 0 0  
Fair Value, Measurements, Recurring [Member] | Money Market And Other Mutual Funds [Member] | Equity And Other Non-Debt Securities [Member] | Level 3 [Member]
      
Investment securities available-for-sale 0 0  
Fair Value, Measurements, Recurring [Member] | Deferred Compensation Plan Assets [Member]
      
Trading securities 90 86  
Fair Value, Measurements, Recurring [Member] | Deferred Compensation Plan Assets [Member] | Level 1 [Member]
      
Trading securities 90 86  
Fair Value, Measurements, Recurring [Member] | Deferred Compensation Plan Assets [Member] | Level 2 [Member]
      
Trading securities 0 0  
Fair Value, Measurements, Recurring [Member] | Deferred Compensation Plan Assets [Member] | Level 3 [Member]
      
Trading securities 0 0  
Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed Securities [Member]
      
Trading securities 2 [2] 7 [2]  
Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed Securities [Member] | Level 1 [Member]
      
Trading securities 0 [2] 0 [2]  
Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed Securities [Member] | Level 2 [Member]
      
Trading securities 2 [2] 7 [2]  
Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed Securities [Member] | Level 3 [Member]
      
Trading securities 0 [2] 0 [2]  
Fair Value, Measurements, Recurring [Member] | Other Government-Sponsored Enterprise Securities [Member]
      
Trading securities 9 1  
Fair Value, Measurements, Recurring [Member] | Other Government-Sponsored Enterprise Securities [Member] | Level 1 [Member]
      
Trading securities 0 0  
Fair Value, Measurements, Recurring [Member] | Other Government-Sponsored Enterprise Securities [Member] | Level 2 [Member]
      
Trading securities 9 1  
Fair Value, Measurements, Recurring [Member] | Other Government-Sponsored Enterprise Securities [Member] | Level 3 [Member]
      
Trading securities 0 0  
Fair Value, Measurements, Recurring [Member] | State And Municipal Securities [Member]
      
Trading securities 12 19  
Fair Value, Measurements, Recurring [Member] | State And Municipal Securities [Member] | Level 1 [Member]
      
Trading securities 0 0  
Fair Value, Measurements, Recurring [Member] | State And Municipal Securities [Member] | Level 2 [Member]
      
Trading securities 12 19  
Fair Value, Measurements, Recurring [Member] | State And Municipal Securities [Member] | Level 3 [Member]
      
Trading securities 0 0  
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]
      
Trading securities 1 4  
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Level 1 [Member]
      
Trading securities 0 0  
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Level 2 [Member]
      
Trading securities 1 4  
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Level 3 [Member]
      
Trading securities 0 0  
Fair Value, Measurements, Recurring [Member] | Other Securities [Member]
      
Trading securities 1 1  
Fair Value, Measurements, Recurring [Member] | Other Securities [Member] | Level 1 [Member]
      
Trading securities 1 0  
Fair Value, Measurements, Recurring [Member] | Other Securities [Member] | Level 2 [Member]
      
Trading securities 0 0  
Fair Value, Measurements, Recurring [Member] | Other Securities [Member] | Level 3 [Member]
      
Trading securities $ 0 $ 1  
[1] Recorded in “investment securities available-for-sale” on the consolidated balance sheets.
[2] (a)Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.
[3] (b)Primarily auction-rate securities.