Consolidated Statements of Changes in Stockholder's Equity - USD ($) $ in Millions		Total	Common Stock	Additional Paid-in Capital	Retained Earnings		Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Balance, beginning (Previously Reported) at Dec. 31, 2014		$ 230
Balance, beginning at Dec. 31, 2014		15,168	$ 136	$ 7,232	$ 8,265		$ (729)	$ 264
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		132			137			(5)
Other comprehensive income (loss), net of tax		132					132
Compensation-restricted stock units		9		9
Other		(9)			0	[1]		(9)
Net change		264		9	137		132	(14)
Balance, ending at Mar. 31, 2015		15,432	136	7,241	8,402		(597)	250
Balance, beginning (Previously Reported) at Dec. 31, 2015		181
Balance, beginning at Dec. 31, 2015		15,676	136	7,241	8,836		(752)	215
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		37			49			(12)
Other comprehensive income (loss), net of tax		239					239
Compensation-restricted stock units		9		9	0
Other	[1]	8			0			8
Net change		293		9	49		239	(4)
Balance, ending at Mar. 31, 2016		$ 15,969	$ 136	$ 7,250	$ 8,885		$ (513)	$ 211

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