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Consolidated Statement of Income (Parenthetical) (Unaudited) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Noninterest income    
Total OTTI recorded as part of gross realized losses $ 38 $ 51
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Equity Securities and Nonmarketable Equity Securities 44 15
Debt Securities [Member]
   
Noninterest income    
Total OTTI losses (gains) recorded on debt securities (15) 35
Total OTTI recorded as part of gross realized losses 34 50
Total recorded directly to OCI for non-credit-related impairment $ (49) $ (15)