Quarterly report pursuant to Section 13 or 15(d)

Investment Securities Investment Securities - Maturities and Realized Gains (Details)

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Investment Securities Investment Securities - Maturities and Realized Gains (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Expected and Contractual Maturities [Abstract]          
Due in one year or less, amortized cost $ 413   $ 413    
Due in one year or less, fair value 413   413    
Due after one year through five years, amortized cost 182   182    
Due after one year through five years, fair value 182   182    
Due after five years through ten years, amortized cost 104   104    
Due after five years through ten years, fair value 104   104    
Available-for-sale 699 [1]   699 [1]   694
Available-for-sale, fair value 699 [1]   699 [1]   694
Proceeds and Gross Unrealized Gains (Losses) on Available For Sale Securities [Abstract]          
Proceeds 0 1,866 3 3,453  
Gross realized gains 0 0 0 44  
Gross realized losses 0 4 0 4  
Gain on sale of investment in BlackRock, Inc.   $ 377      
[1] Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay their obligations with or without prepayment penalties.