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Investment Securities Investment Securities (Schedule of Unrealized Losses on Investments) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
securities
Residential Mortgage Backed Securities [Member]
 
Investment Holdings [Line Items]  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 21
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 1,125
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 15
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0
US States and Political Subdivisions Debt Securities [Member]
 
Investment Holdings [Line Items]  
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 4
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 16
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 1
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses $ 0