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Securities - Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details) (Held-to-maturity Securities [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Held-to-maturity Securities [Member]
   
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]    
Credit losses at the beginning of the period $ 61 $ 0
Increase in credit losses for which an other-than-temporary impairment was previously recognized 2 0
Ending balance of credit losses on held-to-maturity debt securities for which a portion of an other-than-temporary impairment was recognized in other comprehensive income (loss) $ 63 $ 0