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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
Mar. 31, 2012
Dec. 31, 2011
Fair value of temporarily impaired available for sale securities, less than 12 months $ 1,980 $ 3,604
Unrealized losses on temporarily impaired available for sale securities, less than 12 months 12 81
Fair value of temporarily impaired available for sale securities, 12 months or more 857 633
Unrealized losses on temporarily impaired available for sale securities, 12 months or more 140 132
Total fair value of temporarily impaired available for sale securities 2,837 4,237
Total unrealized losses on temporarily impaired available for sale securities 152 213
Fair value of temporarily impaired held to maturity securities, less than 12 months 5,689 8,260
Unrealized losses on temporarily impaired held to maturity securities, less than 12 months 24 29
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 7 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0 0
Total fair value of temporarily impaired held to maturity securities 5,696 8,260
Total unrealized losses on temporarily impaired held to maturity securities 24 29
U.S. Government-Sponsored Entities ("GSE") [Member]
   
Fair value of temporarily impaired available for sale securities, less than 12 months 230 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 230 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 498 250
Unrealized losses on temporarily impaired held to maturity securities, less than 12 months 2 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0 0
Total fair value of temporarily impaired held to maturity securities 498 250
Total unrealized losses on temporarily impaired held to maturity securities 2 0
Mortgage-Backed Securities Issued by GSE [Member]
   
Fair value of temporarily impaired available for sale securities, less than 12 months 1,680 3,098
Unrealized losses on temporarily impaired available for sale securities, less than 12 months 7 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 1,681 3,098
Total unrealized losses on temporarily impaired available for sale securities 7 7
Fair value of temporarily impaired held to maturity securities, less than 12 months 4,678 7,770
Unrealized losses on temporarily impaired held to maturity securities, less than 12 months 16 23
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0 0
Total fair value of temporarily impaired held to maturity securities 4,678 7,770
Total unrealized losses on temporarily impaired held to maturity securities 16 23
States and Political Subdivisions [Member]
   
Fair value of temporarily impaired available for sale securities, less than 12 months 70 453
Unrealized losses on temporarily impaired available for sale securities, less than 12 months 5 68
Fair value of temporarily impaired available for sale securities, 12 months or more 551 265
Unrealized losses on temporarily impaired available for sale securities, 12 months or more 99 77
Total fair value of temporarily impaired available for sale securities 621 718
Total unrealized losses on temporarily impaired available for sale securities 104 145
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
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 7 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0 0
Total fair value of temporarily impaired held to maturity securities 8 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 305 368
Unrealized losses on temporarily impaired available for sale securities, 12 months or more 41 55
Total fair value of temporarily impaired available for sale securities 305 368
Total unrealized losses on temporarily impaired available for sale securities 41 55
Other Securities [Member]
   
Fair value of temporarily impaired held to maturity securities, less than 12 months 512 207
Unrealized losses on temporarily impaired held to maturity securities, less than 12 months 6 4
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0 0
Total fair value of temporarily impaired held to maturity securities 512 207
Total unrealized losses on temporarily impaired held to maturity securities 6 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