Quarterly Results (Unaudited) Level 4 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 682	$ 789	$ 1,396	$ 495	$ 355	$ 804	$ 229	$ 2,267	$ 3,362	$ 3,655	$ 4,104
Total benefits, losses and expenses	525	699	826	451	519	550	271	1,754	2,501	3,094	3,573
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	130	91	399	57	(68)	202	11	367	677	512	495
Income (loss) from discontinued operations, net of tax	0	0	0	0	(13)	(1)	(46)	19	0	(41)	61
Net income	130	91	399	57	(81)	201	(35)	386	677	471	556	556
Less: Net income (loss) attributable to the noncontrolling interest	(2)	3	(1)	1	0	0	0	6	1	6	2
Net Income (Loss) Attributable to Parent	$ 132	$ 88	$ 400	$ 56	$ (81)	$ 201	$ (35)	$ 380	$ 676	$ 465	$ 554