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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
Sep. 30, 2012
Dec. 31, 2011
Fair value of temporarily impaired available for sale securities, less than 12 months $ 1,058 $ 3,143
Unrealized losses on temporarily impaired available for sale securities, less than 12 months 3 16
Fair value of temporarily impaired available for sale securities, 12 months or more 998 1,070
Unrealized losses on temporarily impaired available for sale securities, 12 months or more 112 197
Total fair value of temporarily impaired available for sale securities 2,056 4,213
Total unrealized losses on temporarily impaired available for sale securities 115 213
Fair value of temporarily impaired held to maturity securities, less than 12 months 1,555 8,010
Unrealized losses on temporarily impaired held to maturity securities, less than 12 months 7 29
Fair value of temporarily impaired held to maturity securities, 12 months or more 253 0
Unrealized losses on temporarily impaired held to maturity securities, 12 months or more 1 0
Total fair value of temporarily impaired held to maturity securities 1,808 8,010
Total unrealized losses on temporarily impaired held to maturity securities 8 29
U.S. Government-Sponsored Entities ("GSE") [Member]
   
Fair value of temporarily impaired held to maturity securities, less than 12 months 299  
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 299  
Total unrealized losses on temporarily impaired held to maturity securities 1  
Mortgage-Backed Securities Issued by GSE [Member]
   
Fair value of temporarily impaired available for sale securities, less than 12 months 1,040 3,098
Unrealized losses on temporarily impaired available for sale securities, less than 12 months 3 7
Fair value of temporarily impaired available for sale securities, 12 months or more 339 0
Unrealized losses on temporarily impaired available for sale securities, 12 months or more 1 0
Total fair value of temporarily impaired available for sale securities 1,379 3,098
Total unrealized losses on temporarily impaired available for sale securities 4 7
Fair value of temporarily impaired held to maturity securities, less than 12 months 836 7,770
Unrealized losses on temporarily impaired held to maturity securities, less than 12 months 0 23
Fair value of temporarily impaired held to maturity securities, 12 months or more 193 0
Unrealized losses on temporarily impaired held to maturity securities, 12 months or more 1 0
Total fair value of temporarily impaired held to maturity securities 1,029 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 18 16
Unrealized losses on temporarily impaired available for sale securities, less than 12 months 0 3
Fair value of temporarily impaired available for sale securities, 12 months or more 513 702
Unrealized losses on temporarily impaired available for sale securities, 12 months or more 100 142
Total fair value of temporarily impaired available for sale securities 531 718
Total unrealized losses on temporarily impaired available for sale securities 100 145
Fair value of temporarily impaired held to maturity securities, less than 12 months 23 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 3 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 26 33
Total unrealized losses on temporarily impaired held to maturity securities 1 2
Non-Agency Residential 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 146 368
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 146 368
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 397 207
Unrealized losses on temporarily impaired held to maturity securities, less than 12 months 5 4
Fair value of temporarily impaired held to maturity securities, 12 months or more 57 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 454 207
Total unrealized losses on temporarily impaired held to maturity securities 5 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