Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Millions	Total	Total Stockholders Equity	Common Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Noncontrolling Interest [Member]
Shares outstanding at beginning of period at Dec. 31, 2013			167,000,000
Balance at beginning of period at Dec. 31, 2013		$ 1,783	$ 2	$ 433	$ 1,372	$ (38)	$ 14
Comprehensive income (loss):
Net income (loss)		192			191		1
Other comprehensive (loss) income	$ (101)	(99)				(98)	(1)
Total comprehensive income (loss)		93			191	(98)	0
Employee stock purchase and stock compensation plans		9		9
Employee stock purchase and stock compensation plans (in shares)			2,000,000
Dividend distribution		2					2
Shares outstanding at end of period at Dec. 31, 2014			169,000,000
Balance at end of period at Dec. 31, 2014		1,883	$ 2	442	1,563	(136)	12
Comprehensive income (loss):
Net income (loss)		(176)			(178)		2
Other comprehensive (loss) income	$ (17)	(16)			0	(14)	(2)
Total comprehensive income (loss)		(192)			(178)	(14)	0
Employee stock purchase and stock compensation plans		50		50
Employee stock purchase and stock compensation plans (in shares)			1,000,000
Stock Repurchased During Period, Shares			(37,000,000)
Stock Repurchased During Period, Value		1,005	$ (1)	(492)	(512)
Dividends, Preferred Stock		4			4
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		(6)		0			(6)
Shares outstanding at end of period at Dec. 31, 2015	133,000,000		133,000,000
Balance at end of period at Dec. 31, 2015	$ 726	726	$ 1	0	869	(150)	6
Comprehensive income (loss):
Net income (loss)		272			270		2
Other comprehensive (loss) income	$ (60)	(57)				(55)	(2)
Total comprehensive income (loss)		215			270	(55)	0
Employee stock purchase and stock compensation plans		59		59
Employee stock purchase and stock compensation plans (in shares)			2,000,000
Stock Repurchased During Period, Shares			(10,000,000)
Stock Repurchased During Period, Value		(250)	$ 0	(27)	(223)
Dividends, Preferred Stock		49			49
Dividend distribution		2					2
Shares outstanding at end of period at Dec. 31, 2016	124,600,000		125,000,000
Balance at end of period at Dec. 31, 2016	$ 699	$ 699	$ 1	$ 32	$ 867	$ (205)	$ 4