CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
Beginning balance at Dec. 31, 2014	$ (703)	$ 1		$ 143	$ (788)	$ (59)
Beginning Balance, Shares at Dec. 31, 2014		124.1
Issuance of common stock	65			65
Issuance of common stock, Shares		3.1
Repurchase of common stock	(516)			(455)	(61)
Repurchase of common stock, Shares		(7.8)
Stock-based compensation	31			31
Income tax benefits from stock-based award activities	39			39
Q2 Solutions business combination	423			423
Non-controlling interest related to Q2 Solutions transaction				(231)			$ 231
Deferred tax impact of the Q2 Solutions transaction	(7)			(7)
Net income	388				387		1
Unrealized gain (loss) on derivative instruments, net of tax	(9)					(9)
Foreign currency translation, net of tax	(60)					(56)	(4)
Reclassification adjustments, net of tax	13					13
Ending balance at Dec. 31, 2015	(336)	$ 1		8	(462)	(111)	228
Ending Balance, Shares at Dec. 31, 2015		119.4
Issuance of common stock	10,523	$ 1		10,522
Issuance of common stock, Shares		130.4
Repurchase of common stock	(98)			(46)	(52)
Repurchase of common stock, Shares		(1.5)
Repurchase of common stock on or after October 3, 2016	(1,000)		$ (1,000)
Repurchase of common stock on or after October 3, 2016, Shares			(12.9)
Stock-based compensation	76			76
Income tax benefits from stock-based award activities	41			41
Investment by non-controlling interest	(1)			(1)
Net income	130				115		15
Unrealized gain (loss) on derivative instruments, net of tax	(7)					(7)
Defined benefit plan adjustments, net of tax	23					23
Foreign currency translation, net of tax	(513)					(497)	(16)
Reclassification adjustments, net of tax	22					22
Ending balance at Dec. 31, 2016	8,860	$ 2	$ (1,000)	10,600	(399)	(570)	227
Ending Balance, Shares at Dec. 31, 2016		248.3
Ending balance at Dec. 31, 2016			(12.9)
Issuance of common stock, Shares		3.7
Repurchase of common stock	(2,374)		$ (2,374)
Repurchase of common stock on or after October 3, 2016, Shares			(28.5)
Repurchase and retirement of common stock	(255)				(255)
Repurchase and retirement of common stock, Shares		(2.5)
Stock-based compensation	180			180
Distribution to non-controlling interest	(4)						(4)
Net income	1,328				1,309		19
Unrealized gain (loss) on derivative instruments, net of tax	4					4
Defined benefit plan adjustments, net of tax	5					5
Foreign currency translation, net of tax	614					607	7
Ending balance at Dec. 31, 2017	$ 8,358	$ 2	$ (3,374)	$ 10,780	$ 655	$ 46	$ 249
Ending Balance, Shares at Dec. 31, 2017		249.5
Ending balance at Dec. 31, 2017			(41.4)