Quarterly report pursuant to Section 13 or 15(d)

Securities - Rollforward of Credit Losses Recognized (Details)

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Securities - Rollforward of Credit Losses Recognized (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Rollforward of Credit Losses Recognized:        
Balance, beginning of period $ 195 $ 205 $ 184 $ 243
Additions for credit losses recognized on AFS debt securities that had no previous impairment losses 0 1 11 6
Additions for credit losses recognized on AFS debt securities that had previously incurred impairment losses 1 6 1 14
Reductions for AFS debt securities matured, sold or intended to be sold 0 0 0 (51)
Balance, September 30 $ 196 $ 212 $ 196 $ 212