Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	AOCI Attributable to Parent [Member]	Retained Earnings	Non-Controlling Interest	Dividend to Parent [Member]	Extraordinary Item [Member] Dividend to Parent [Member]
Beginning balance at Dec. 31, 2012	$ 10,383	$ 6	$ 8,155	$ 1,987	$ 235	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital contributions to parent	(1,196)		(1,196)			0
Net Income (Loss) Attributable to Parent	465				465
Change in noncontrolling interest ownership	(6)					(6)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	471
Net Income (Loss) Attributable to Noncontrolling Interest	6					6
Total other comprehensive income	(1,413)			(1,413)
Ending balance at Dec. 31, 2013	8,239	6	6,959	574	700	0
Dividends							$ (271)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	676				676
Change in noncontrolling interest ownership	(1)					(1)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	677
Net Income (Loss) Attributable to Noncontrolling Interest	1					1
Total other comprehensive income	647			647
Ending balance at Dec. 31, 2014	9,291	6	6,688	1,221	1,376	0
Dividends								$ (1,001)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	500
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	500
Net Income (Loss) Attributable to Noncontrolling Interest	0
Total other comprehensive income	(628)
Ending balance at Dec. 31, 2015	$ 8,162	$ 6	$ 5,687	$ 593	$ 1,876	$ 0