CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net unrealized derivative instrument gains (losses) arising during the periods, Tax	$ (3)	$ 36	$ 36	$ 70
Reclassification adjustment for net derivative (losses) gains included in net income, Tax	(1)	3	(2)	7
Net unrealized securities available for sale (losses) gains arising during the periods, Tax	(66)	68	(12)	109
Other-than-temporary impairment not recognized in earnings on securities, Tax	0	(1)	(11)	(12)
Reclassification of net securities gains to net income, Tax	(2)	0	(5)	(7)
Amortization of actuarial loss, Tax	$ 2	$ 0	$ 3	$ 1