CONSOLIDATED STATEMENT OF INCOME (UNAUDITED) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 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	$ 4	$ 0	$ 11