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Consolidated Statement of Income (Unaudited) (Parenthetical) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Noninterest income    
Other-than-temporary impairment losses on debt securities available for sale in earnings $ 50 $ 80
Total other-than-temporary impairment losses on debt securities available for sale recognized in earnings and other comprehensive income 35 (76)
Total recorded directly to OCI for non-credit-related impairment (15) (156)
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Equity Securities and Nonmarketable Equity Securities $ 15 $ 41