Total Equity and Other Comprehensive Income (Accumulated Other Comprehensive Income (Loss) Components) (Details) (USD $)	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
Other Comprehensive Income [Abstract]
Net unrealized gains (losses) on non-OTTI securities, pretax	$ 916,000,000	$ 1,048,000,000	$ 647,000,000	$ 827,000,000	$ 895,000,000	$ 1,858,000,000
Net unrealized gains (losses) on non-OTTI securities, after-tax	580,000,000	663,000,000	409,000,000	523,000,000	563,000,000	1,177,000,000
Net unrealized gains (losses) on OTTI securities, before tax	158,000,000	143,000,000	36,000,000	(41,000,000)	(99,000,000)	(195,000,000)
Net unrealized gains (losses) on OTTI securities, after tax	101,000,000	92,000,000	24,000,000	(25,000,000)	(62,000,000)	(123,000,000)
Net unrealized gains (losses) on cash flow hedge derivatives, before tax	379,000,000	460,000,000	384,000,000	492,000,000	523,000,000	911,000,000
Net unrealized gains (losses) on cash flow hedge derivatives, after-tax	240,000,000	292,000,000	243,000,000	312,000,000	332,000,000	578,000,000
Pension and other postretirement benefit plan adjustments, before tax	(285,000,000)	(283,000,000)	(374,000,000)	(1,152,000,000)	(1,173,000,000)	(1,226,000,000)
Pension and other postretirement benefit plan adjustments, after-tax	(181,000,000)	(180,000,000)	(237,000,000)	(730,000,000)	(744,000,000)	(777,000,000)
Other, pretax	(25,000,000)	(13,000,000)	(20,000,000)	(51,000,000)	(54,000,000)	(41,000,000)
Other, after tax	(13,000,000)	14,000,000	(3,000,000)	(33,000,000)	(44,000,000)	(21,000,000)
Accumulated other comprehensive income (loss), pretax	1,143,000,000		673,000,000
Accumulated other comprehensive income (loss), after-tax	$ 727,000,000		$ 436,000,000