Quarterly Results (Unaudited) Level 4 (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 499	$ 630	$ 702	$ 668	$ 682	$ 789	$ 1,396	$ 495	$ 2,499	$ 3,362	$ 3,655
Total benefits, losses and expenses	525	500	461	483	525	699	826	451	1,969	2,501	3,094
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest									500	677	512
Income from discontinued operations, net of tax											(41)
Net income	7	118	230	145	130	91	399	57	500	677	471
Less: Net income (loss) attributable to the noncontrolling interest	(1)	1	0	0	(2)	3	(1)	1	0	1	6
Net Income (Loss) Attributable to Parent	$ 8	$ 117	$ 230	$ 145	$ 132	$ 88	$ 400	$ 56	$ 500	$ 676	$ 465