CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Stock options Common Stock [Member]	Stock Units [Member] Common Stock [Member]
Common stock, shares issued (in shares)		374
Stockholders' Equity Attributable to Parent	$ 2,614	$ 19	$ 85	$ 2,501	$ 9
Net income (loss)	272			272
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	2				2
Change in fair value of derivative financial instruments, net of tax (tax benefit)	(6)				(6)
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent	11				11
Stock Repurchased and Retired During Period, Shares		(5)
Stock Repurchased and Retired During Period, Value	(128)	$ 0	(128)
Stock Issued During Period, Shares, Other						3	2
Stock Issued During Period, Value, Other	48	0	48
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(34)	$ 0	(34)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	$ 100		100
Common Stock, Dividends, Per Share, Declared	$ 0.24
Dividends, Cash	$ (92)			(92)
Common stock, shares issued (in shares)		376
Stockholders' Equity Attributable to Parent	3,020	$ 19	114	2,879	8
Net income (loss)	(152)			(152)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	4				4
Change in fair value of derivative financial instruments, net of tax (tax benefit)	1				1
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent	3				3
Stock Repurchased and Retired During Period, Shares		(3)
Stock Repurchased and Retired During Period, Value	(73)	$ 0	(73)
Stock Issued During Period, Shares, Other						1	0
Stock Issued During Period, Value, Other	7	0	7
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(2)	$ 0	(2)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	$ 25		25
Common Stock, Dividends, Per Share, Declared	$ 0.12
Dividends, Cash	$ (46)			(46)
Common stock, shares issued (in shares)	374	374
Stockholders' Equity Attributable to Parent	$ 2,787	$ 19	71	2,681	16
Common stock, shares issued (in shares)	371	371
Stockholders' Equity Attributable to Parent	$ 2,722	$ 19	43	2,622	38
Net income (loss)	71			71
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	13				13
Change in fair value of derivative financial instruments, net of tax (tax benefit)	40				40
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent	(22)				(22)
Stock Repurchased and Retired During Period, Shares		(11)
Stock Repurchased and Retired During Period, Value	(123)	$ 1	(63)	(59)
Stock Issued During Period, Shares, Other						2	3
Stock Issued During Period, Value, Other	23	0	23
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(17)	$ 0	(17)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	$ 30		30
Common Stock, Dividends, Per Share, Declared	$ 0.45
Dividends, Cash	$ (166)			(166)
Common stock, shares issued (in shares)		364
Stockholders' Equity Attributable to Parent	2,305	$ 18	0	2,241	46
Net income (loss)	282			282
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	6				6
Change in fair value of derivative financial instruments, net of tax (tax benefit)	31				31
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent	(14)				(14)
Stock Repurchased and Retired During Period, Shares		(2)
Stock Repurchased and Retired During Period, Value	(12)	$ 0	(12)
Stock Issued During Period, Shares, Other						1	2
Stock Issued During Period, Value, Other	8	0	8
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(2)	$ 0	(2)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	$ 22		22
Common Stock, Dividends, Per Share, Declared	$ 0.15
Dividends, Cash	$ (55)			(55)
Common stock, shares issued (in shares)	365	365
Stockholders' Equity Attributable to Parent	$ 2,571	$ 18	$ 16	$ 2,468	$ 69