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Investment Securities (Details) (USD $)
In Millions
6 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Schedule of Available for Sale Securities by Type    
Cost $ 9,207 $ 13,937
Gross Unrealized Gains 469 444
Gross Unrealized Losses (247) (371)
Investment securities 9,429 14,010
U.S. States and Political Subdivisions Debt Securities [Member]
   
Schedule of Available for Sale Securities by Type    
Cost 5,363 6,140
Gross Unrealized Gains 40 24
Gross Unrealized Losses (246) (367)
Investment securities 5,157 5,797
U.S. Government agency obligations [Member]
   
Schedule of Available for Sale Securities by Type    
Cost 352 3,402
Gross Unrealized Gains 5 12
Gross Unrealized Losses 0 (1)
Investment securities 357 3,413
U.S. Government treasury obligations [Member]
   
Schedule of Available for Sale Securities by Type    
Cost 1,935 2,450
Gross Unrealized Gains 8 6
Gross Unrealized Losses 0 0
Investment securities 1,943 2,456
Corporate debt securities [Member]
   
Schedule of Available for Sale Securities by Type    
Cost 1,011 1,431
Gross Unrealized Gains 15 15
Gross Unrealized Losses 0 (1)
Investment securities 1,026 1,445
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
   
Schedule of Available for Sale Securities by Type    
Cost 277 272
Gross Unrealized Gains 9 6
Gross Unrealized Losses (1) (2)
Investment securities 285 276
Equity securities [Member]
   
Schedule of Available for Sale Securities by Type    
Cost 98 98
Gross Unrealized Gains 386 377
Gross Unrealized Losses 0 0
Investment securities 484 475
Foreign government bonds and obligations [Member]
   
Schedule of Available for Sale Securities by Type    
Cost 111 95
Gross Unrealized Gains 6 4
Gross Unrealized Losses 0 0
Investment securities 117 99
Availabe For Sale Securities Other [Member]
   
Schedule of Available for Sale Securities by Type    
Cost 60 49
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Investment securities $ 60 $ 49