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Securities (Gross Unrealized Losses and Fair Values of Investments by Investment Category and Length of Time) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Fair value of temporarily impaired available for sale securities, less than 12 months $ 2,750 $ 3,167
Unrealized losses on temporarily impaired available for sale securities, less than 12 months 11 16
Fair value of temporarily impaired available for sale securities, 12 months or more 781 1,070
Unrealized losses on temporarily impaired available for sale securities, 12 months or more 150 197
Total fair value of temporarily impaired available for sale securities 3,531 4,237
Total unrealized losses on temporarily impaired available for sale securities 161 213
Fair value of temporarily impaired held to maturity securities, less than 12 months 1,606 8,260
Unrealized losses on temporarily impaired held to maturity securities, less than 12 months 8 29
Fair value of temporarily impaired held to maturity securities, 12 months or more 256 0
Unrealized losses on temporarily impaired held to maturity securities, 12 months or more 0 0
Total fair value of temporarily impaired held to maturity securities 1,862 8,260
Total unrealized losses on temporarily impaired held to maturity securities 8 29
U.S. Government-Sponsored Entities ("GSE") [Member]
   
Fair value of temporarily impaired available for sale securities, less than 12 months 215 24
Unrealized losses on temporarily impaired available for sale securities, less than 12 months 0 0
Fair value of temporarily impaired available for sale securities, 12 months or more 0 0
Unrealized losses on temporarily impaired available for sale securities, 12 months or more 0 0
Total fair value of temporarily impaired available for sale securities 215 24
Total unrealized losses on temporarily impaired available for sale securities 0 0
Fair value of temporarily impaired held to maturity securities, less than 12 months   250
Unrealized losses on temporarily impaired held to maturity securities, less than 12 months   0
Fair value of temporarily impaired held to maturity securities, 12 months or more   0
Unrealized losses on temporarily impaired held to maturity securities, 12 months or more   0
Total fair value of temporarily impaired held to maturity securities   250
Total unrealized losses on temporarily impaired held to maturity securities   0
Mortgage-Backed Securities Issued by GSE [Member]
   
Fair value of temporarily impaired available for sale securities, less than 12 months 2,453 3,098
Unrealized losses on temporarily impaired available for sale securities, less than 12 months 8 7
Fair value of temporarily impaired available for sale securities, 12 months or more 1 0
Unrealized losses on temporarily impaired available for sale securities, 12 months or more 0 0
Total fair value of temporarily impaired available for sale securities 2,454 3,098
Total unrealized losses on temporarily impaired available for sale securities 8 7
Fair value of temporarily impaired held to maturity securities, less than 12 months 1,048 7,770
Unrealized losses on temporarily impaired held to maturity securities, less than 12 months 1 23
Fair value of temporarily impaired held to maturity securities, 12 months or more 254 0
Unrealized losses on temporarily impaired held to maturity securities, 12 months or more 0 0
Total fair value of temporarily impaired held to maturity securities 1,302 7,770
Total unrealized losses on temporarily impaired held to maturity securities 1 23
States and Political Subdivisions [Member]
   
Fair value of temporarily impaired available for sale securities, less than 12 months 69 16
Unrealized losses on temporarily impaired available for sale securities, less than 12 months 3 3
Fair value of temporarily impaired available for sale securities, 12 months or more 536 702
Unrealized losses on temporarily impaired available for sale securities, 12 months or more 117 142
Total fair value of temporarily impaired available for sale securities 605 718
Total unrealized losses on temporarily impaired available for sale securities 120 145
Fair value of temporarily impaired held to maturity securities, less than 12 months 1 33
Unrealized losses on temporarily impaired held to maturity securities, less than 12 months 0 2
Fair value of temporarily impaired held to maturity securities, 12 months or more 2 0
Unrealized losses on temporarily impaired held to maturity securities, 12 months or more 0 0
Total fair value of temporarily impaired held to maturity securities 3 33
Total unrealized losses on temporarily impaired held to maturity securities 0 2
Non-Agency Mortgage-Backed Securities [Member]
   
Fair value of temporarily impaired available for sale securities, less than 12 months 0 0
Unrealized losses on temporarily impaired available for sale securities, less than 12 months 0 0
Fair value of temporarily impaired available for sale securities, 12 months or more 244 368
Unrealized losses on temporarily impaired available for sale securities, 12 months or more 33 55
Total fair value of temporarily impaired available for sale securities 244 368
Total unrealized losses on temporarily impaired available for sale securities 33 55
Other Securities [Member]
   
Fair value of temporarily impaired available for sale securities, less than 12 months 0 0
Unrealized losses on temporarily impaired available for sale securities, less than 12 months 0 0
Fair value of temporarily impaired available for sale securities, 12 months or more 0 0
Unrealized losses on temporarily impaired available for sale securities, 12 months or more 0 0
Total fair value of temporarily impaired available for sale securities 0 0
Total unrealized losses on temporarily impaired available for sale securities 0 0
Fair value of temporarily impaired held to maturity securities, less than 12 months 557 207
Unrealized losses on temporarily impaired held to maturity securities, less than 12 months 7 4
Fair value of temporarily impaired held to maturity securities, 12 months or more 0 0
Unrealized losses on temporarily impaired held to maturity securities, 12 months or more 0 0
Total fair value of temporarily impaired held to maturity securities 557 207
Total unrealized losses on temporarily impaired held to maturity securities 7 4
Covered Securities [Member]
   
Fair value of temporarily impaired available for sale securities, less than 12 months 13 29
Unrealized losses on temporarily impaired available for sale securities, less than 12 months 0 6
Fair value of temporarily impaired available for sale securities, 12 months or more 0 0
Unrealized losses on temporarily impaired available for sale securities, 12 months or more 0 0
Total fair value of temporarily impaired available for sale securities 13 29
Total unrealized losses on temporarily impaired available for sale securities $ 0 $ 6