Consolidated Statements of Changes in Equity (USD $) In Millions, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings (Deficit)	Non-Controlling Interest
Beginning balance at Dec. 31, 2010
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital contributions to parent	$ (116)					$ 0
Net Income (Loss) Attributable to Parent					554
Change in noncontrolling interest ownership	(2)					(2)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	556
Net Income (Loss) Attributable to Noncontrolling Interest						2
Total other comprehensive income	1,034			1,034
Ending balance at Dec. 31, 2011	8,911	6	8,271	953	(319)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital contributions to parent			(116)
Net Income (Loss) Attributable to Parent	554
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	556
Net Income (Loss) Attributable to Noncontrolling Interest	2
Total other comprehensive income	1,034
Ending 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)
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Income (Loss) Attributable to Parent	271		271
Capital contributions to parent	(1,000)
Net Income (Loss) Attributable to Parent	676
Change in noncontrolling interest ownership	(1)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	677
Net Income (Loss) Attributable to Noncontrolling Interest	1
Total other comprehensive income	647
Ending balance at Dec. 31, 2014	$ 9,291	$ 6	$ 6,688	$ 1,221	$ 1,376	$ 0