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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, 2013
Dec. 31, 2012
Fair value of temporarily impaired available for sale securities, less than 12 months $ 11,631 $ 2,714
Unrealized losses on temporarily impaired available for sale securities, less than 12 months 281 19
Fair value of temporarily impaired available for sale securities, 12 months or more 529 591
Unrealized losses on temporarily impaired available for sale securities, 12 months or more 95 100
Total fair value of temporarily impaired available for sale securities 12,160 3,305
Total unrealized losses on temporarily impaired available for sale securities 376 119
Fair value of temporarily impaired held to maturity securities, less than 12 months 10,778 1,686
Unrealized losses on temporarily impaired held to maturity securities, less than 12 months 340 6
Fair value of temporarily impaired held to maturity securities, 12 months or more 48 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 10,826 1,686
Total unrealized losses on temporarily impaired held to maturity securities 340 6
GSE Securities
   
Fair value of temporarily impaired held to maturity securities, less than 12 months 4,812 805
Unrealized losses on temporarily impaired held to maturity securities, less than 12 months 272 1
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 4,812 805
Total unrealized losses on temporarily impaired held to maturity securities 272 1
RMBS Issued by GSE
   
Fair value of temporarily impaired available for sale securities, less than 12 months 11,392 2,662
Unrealized losses on temporarily impaired available for sale securities, less than 12 months 272 18
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 11,393 2,662
Total unrealized losses on temporarily impaired available for sale securities 272 18
Fair value of temporarily impaired held to maturity securities, less than 12 months 5,966 593
Unrealized losses on temporarily impaired held to maturity securities, less than 12 months 68 1
Fair value of temporarily impaired held to maturity securities, 12 months or more 48 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 6,014 593
Total unrealized losses on temporarily impaired held to maturity securities 68 1
States and Political Subdivisions [Member]
   
Fair value of temporarily impaired available for sale securities, less than 12 months 239 52
Unrealized losses on temporarily impaired available for sale securities, less than 12 months 9 1
Fair value of temporarily impaired available for sale securities, 12 months or more 423 478
Unrealized losses on temporarily impaired available for sale securities, 12 months or more 85 89
Total fair value of temporarily impaired available for sale securities 662 530
Total unrealized losses on temporarily impaired available for sale securities 94 90
Fair value of temporarily impaired held to maturity securities, less than 12 months 0 22
Unrealized losses on temporarily impaired held to maturity securities, less than 12 months 0 1
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 0 22
Total unrealized losses on temporarily impaired held to maturity securities 0 1
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 105 113
Unrealized losses on temporarily impaired available for sale securities, 12 months or more 10 11
Total fair value of temporarily impaired available for sale securities 105 113
Total unrealized losses on temporarily impaired available for sale securities 10 11
Other Securities [Member]
   
Fair value of temporarily impaired held to maturity securities, less than 12 months   266
Unrealized losses on temporarily impaired held to maturity securities, less than 12 months   3
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   266
Total unrealized losses on temporarily impaired held to maturity securities   $ 3