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Investment Securities (Maturities of Available-for-Sale Debt Securities and Held-to-Maturity Debt Securities) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Investment Holdings [Line Items]    
Available-for-sale securities, debt maturities, one year or less, amortized cost $ 711 [1]  
Available-for-sale securities, debt maturities, after one year through five years, amortized cost 2,905 [1]  
Available-for-sale securities, debt maturities, after five years through ten years, amortized cost 347 [1]  
Available-for-sale securities, debt maturities, after ten years, amortized cost 862 [1]  
Available-for-sale securities, debt maturities, amortized cost 4,825 [1]  
Held-to-maturity securities, debt maturities, one year or less, amortized cost 2 [2]  
Held-to-maturity securities, debt maturities, after one year through five years, amortized cost 1 [2]  
Held-to-maturity securities, debt maturities, after five years through ten years, amortized cost 0 [2]  
Held-to-maturity securities, debt maturities, after ten years, amortized cost 68 [2]  
Held-to-maturity securities, debt maturities, amortized cost 71 [2]  
Available-for-sale securities, debt maturities, one year or less, fair value 714 [1]  
Available-for-sale debt maturities, after one year through five years, fair value 2,964 [1]  
Available-for-sale securities, debt maturities, after five years through ten years, fair value 344 [1]  
Available-for-sale securities, debt maturities, after ten years, fair value 850 [1]  
Available-for-sale investment securities, fair value 4,872 [1] 6,145 [1]
Held-to-maturity securities, debt maturities, one year or less, fair value 2 [2]  
Held-to-maturity securities, debt maturities, after one year through five years, fair value 1 [2]  
Held-to-maturity securities, debt maturities, after five years through ten years, fair value 0 [2]  
Held-to-maturity securities, debt maturities, after ten years, fair value 67 [2]  
Held-to-maturity securities, debt maturities, fair value 70 [2]  
US Treasury Securities [Member]
   
Investment Holdings [Line Items]    
Available-for-sale securities, debt maturities, one year or less, amortized cost 540 [1]  
Available-for-sale securities, debt maturities, after one year through five years, amortized cost 1,496 [1]  
Available-for-sale securities, debt maturities, after five years through ten years, amortized cost 0 [1]  
Available-for-sale securities, debt maturities, after ten years, amortized cost 0 [1]  
Available-for-sale securities, debt maturities, amortized cost 2,036 [1]  
Held-to-maturity securities, debt maturities, one year or less, amortized cost 1 [2]  
Held-to-maturity securities, debt maturities, after one year through five years, amortized cost 0 [2]  
Held-to-maturity securities, debt maturities, after five years through ten years, amortized cost 0 [2]  
Held-to-maturity securities, debt maturities, after ten years, amortized cost 0 [2]  
Held-to-maturity securities, debt maturities, amortized cost 1 [2]  
Available-for-sale securities, debt maturities, one year or less, fair value 542 [1]  
Available-for-sale debt maturities, after one year through five years, fair value 1,525 [1]  
Available-for-sale securities, debt maturities, after five years through ten years, fair value 0 [1]  
Available-for-sale securities, debt maturities, after ten years, fair value 0 [1]  
Available-for-sale investment securities, fair value 2,067 [1] 2,459 [1]
Held-to-maturity securities, debt maturities, one year or less, fair value 1 [2]  
Held-to-maturity securities, debt maturities, after one year through five years, fair value 0 [2]  
Held-to-maturity securities, debt maturities, after five years through ten years, fair value 0 [2]  
Held-to-maturity securities, debt maturities, after ten years, fair value 0 [2]  
Held-to-maturity securities, debt maturities, fair value 1 [2]  
US Government Corporations and Agencies Securities [Member]
   
Investment Holdings [Line Items]    
Available-for-sale securities, debt maturities, one year or less, amortized cost 131 [1]  
Available-for-sale securities, debt maturities, after one year through five years, amortized cost 1,409 [1]  
Available-for-sale securities, debt maturities, after five years through ten years, amortized cost 0 [1]  
Available-for-sale securities, debt maturities, after ten years, amortized cost 0 [1]  
Available-for-sale securities, debt maturities, amortized cost 1,540 [1]  
Available-for-sale securities, debt maturities, one year or less, fair value 131 [1]  
Available-for-sale debt maturities, after one year through five years, fair value 1,439 [1]  
Available-for-sale securities, debt maturities, after five years through ten years, fair value 0 [1]  
Available-for-sale securities, debt maturities, after ten years, fair value 0 [1]  
Available-for-sale investment securities, fair value 1,570 [1] 2,233 [1]
Asset-backed Securities, Securitized Loans and Receivables [Member]
   
Investment Holdings [Line Items]    
Available-for-sale securities, debt maturities, one year or less, amortized cost 40 [1]  
Available-for-sale securities, debt maturities, after one year through five years, amortized cost 0 [1]  
Available-for-sale securities, debt maturities, after five years through ten years, amortized cost 0 [1]  
Available-for-sale securities, debt maturities, after ten years, amortized cost 0 [1]  
Available-for-sale securities, debt maturities, amortized cost 40 [1]  
Available-for-sale securities, debt maturities, one year or less, fair value 41 [1]  
Available-for-sale debt maturities, after one year through five years, fair value 0 [1]  
Available-for-sale securities, debt maturities, after five years through ten years, fair value 0 [1]  
Available-for-sale securities, debt maturities, after ten years, fair value 0 [1]  
Available-for-sale investment securities, fair value 41 [1] 151 [1]
US States and Political Subdivisions Debt Securities [Member]
   
Investment Holdings [Line Items]    
Held-to-maturity securities, debt maturities, one year or less, amortized cost 1 [2]  
Held-to-maturity securities, debt maturities, after one year through five years, amortized cost 1 [2]  
Held-to-maturity securities, debt maturities, after five years through ten years, amortized cost 0 [2]  
Held-to-maturity securities, debt maturities, after ten years, amortized cost 22 [2]  
Held-to-maturity securities, debt maturities, amortized cost 24 [2]  
Held-to-maturity securities, debt maturities, one year or less, fair value 1 [2]  
Held-to-maturity securities, debt maturities, after one year through five years, fair value 1 [2]  
Held-to-maturity securities, debt maturities, after five years through ten years, fair value 0 [2]  
Held-to-maturity securities, debt maturities, after ten years, fair value 21 [2]  
Held-to-maturity securities, debt maturities, fair value 23 [2]  
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
   
Investment Holdings [Line Items]    
Available-for-sale securities, debt maturities, one year or less, amortized cost 0 [1]  
Available-for-sale securities, debt maturities, after one year through five years, amortized cost 0 [1]  
Available-for-sale securities, debt maturities, after five years through ten years, amortized cost 347 [1]  
Available-for-sale securities, debt maturities, after ten years, amortized cost 862 [1]  
Available-for-sale securities, debt maturities, amortized cost 1,209 [1]  
Held-to-maturity securities, debt maturities, one year or less, amortized cost 0 [2],[3]  
Held-to-maturity securities, debt maturities, after one year through five years, amortized cost 0 [2],[3]  
Held-to-maturity securities, debt maturities, after five years through ten years, amortized cost 0 [2],[3]  
Held-to-maturity securities, debt maturities, after ten years, amortized cost 46 [2],[3]  
Held-to-maturity securities, debt maturities, amortized cost 46 [2],[3]  
Available-for-sale securities, debt maturities, one year or less, fair value 0 [1]  
Available-for-sale debt maturities, after one year through five years, fair value 0 [1]  
Available-for-sale securities, debt maturities, after five years through ten years, fair value 344 [1]  
Available-for-sale securities, debt maturities, after ten years, fair value 850 [1]  
Available-for-sale investment securities, fair value 1,194 [1] 1,302 [1]
Held-to-maturity securities, debt maturities, one year or less, fair value 0 [2],[3]  
Held-to-maturity securities, debt maturities, after one year through five years, fair value 0 [2],[3]  
Held-to-maturity securities, debt maturities, after five years through ten years, fair value 0 [2],[3]  
Held-to-maturity securities, debt maturities, after ten years, fair value 46 [2],[3]  
Held-to-maturity securities, debt maturities, fair value $ 46 [2],[3]  
[1] Available-for-sale investment securities are reported at fair value.
[2] Held-to-maturity investment securities are reported at amortized cost.
[3] Amounts represent residential mortgage-backed securities that were classified as held-to-maturity as they were entered into as a part of the Company's community reinvestment initiatives.