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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
Dec. 31, 2012
Dec. 31, 2011
Fair value of temporarily impaired available for sale securities, less than 12 months $ 2,714 $ 3,143
Unrealized losses on temporarily impaired available for sale securities, less than 12 months 19 16
Fair value of temporarily impaired available for sale securities, 12 months or more 591 1,070
Unrealized losses on temporarily impaired available for sale securities, 12 months or more 100 197
Total fair value of temporarily impaired available for sale securities 3,305 4,213
Total unrealized losses on temporarily impaired available for sale securities 119 213
Fair value of temporarily impaired held to maturity securities, less than 12 months 1,686 8,010
Unrealized losses on temporarily impaired held to maturity securities, less than 12 months 6 29
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 1,686 8,010
Total unrealized losses on temporarily impaired held to maturity securities 6 29
GSE Securities
   
Fair value of temporarily impaired held to maturity securities, less than 12 months 805  
Unrealized losses on temporarily impaired held to maturity securities, less than 12 months 1  
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 805  
Total unrealized losses on temporarily impaired held to maturity securities 1  
RMBS Issued by GSE
   
Fair value of temporarily impaired available for sale securities, less than 12 months 2,662 3,098
Unrealized losses on temporarily impaired available for sale securities, less than 12 months 18 7
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 2,662 3,098
Total unrealized losses on temporarily impaired available for sale securities 18 7
Fair value of temporarily impaired held to maturity securities, less than 12 months 593 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 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 593 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 52 16
Unrealized losses on temporarily impaired available for sale securities, less than 12 months 1 3
Fair value of temporarily impaired available for sale securities, 12 months or more 478 702
Unrealized losses on temporarily impaired available for sale securities, 12 months or more 89 142
Total fair value of temporarily impaired available for sale securities 530 718
Total unrealized losses on temporarily impaired available for sale securities 90 145
Fair value of temporarily impaired held to maturity securities, less than 12 months 22 33
Unrealized losses on temporarily impaired held to maturity securities, less than 12 months 1 2
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 22 33
Total unrealized losses on temporarily impaired held to maturity securities 1 2
Non-Agency RMBS [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 113 368
Unrealized losses on temporarily impaired available for sale securities, 12 months or more 11 55
Total fair value of temporarily impaired available for sale securities 113 368
Total unrealized losses on temporarily impaired available for sale securities 11 55
Other Securities [Member]
   
Fair value of temporarily impaired held to maturity securities, less than 12 months 266 207
Unrealized losses on temporarily impaired held to maturity securities, less than 12 months 3 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 266 207
Total unrealized losses on temporarily impaired held to maturity securities 3 4
Covered Securities [Member]
   
Fair value of temporarily impaired available for sale securities, less than 12 months   29
Unrealized losses on temporarily impaired available for sale securities, less than 12 months   6
Fair value of temporarily impaired available for sale securities, 12 months or more   0
Unrealized losses on temporarily impaired available for sale securities, 12 months or more   0
Total fair value of temporarily impaired available for sale securities   29
Total unrealized losses on temporarily impaired available for sale securities   $ 6