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CONSOLIDATED STATEMENT OF INCOME (UNAUDITED) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
OTTI losses in the non-credit component of such impaired securities recognized in AOCI, net of tax $ 0 $ 0 $ 0 $ 0
Held-to-maturity Securities [Member]        
Increase in credit losses for which an other-than-temporary impairment was previously recognized 0   0  
Held-to-maturity Securities [Member] | Other Revenues [Member]        
Increase in credit losses for which an other-than-temporary impairment was previously recognized $ 0 $ 5 $ 0 $ 7