CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions	Total	Common Stock Shares	Treasury Stock	Additional Paid-In Capital	Net Parent Investment	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Beginning balance (in shares) at Dec. 31, 2014		1,218.0
Beginning balance at Dec. 31, 2014	$ 8,248		$ 0	$ 0	$ 8,138	$ 110	$ 0
Increase (Decrease) in Stockholders' Equity
Net income	1,228				560		668
Net transfers from eBay	4,143				4,143
Foreign currency translation	(37)					(37)
Unrealized losses on investments, net	(16)					(16)
Tax benefit on unrealized losses on investments, net	3					3
Change in unrealized gains/losses on hedging activities, net	(69)					(69)
Tax expense on unrealized gains on hedging activities, net	0
Common stock and stock-based awards issued and assumed, net of shares withheld for employee taxes (in shares)		6.0
Common stock and stock-based awards issued and assumed, net of shares withheld for employee taxes	64			64
Stock-based compensation	185			185
Stock-based compensation tax impact	10			10
Reclassification of net parent investment in connection with separation	0			12,841	(12,841)
Ending balance (in shares) at Dec. 31, 2015		1,224.0
Ending balance at Dec. 31, 2015	13,759		0	13,100	0	(9)	668
Increase (Decrease) in Stockholders' Equity
Net income	1,401						1,401
Foreign currency translation	(15)					(15)
Unrealized losses on investments, net	11					11
Tax benefit on unrealized losses on investments, net	(1)					(1)
Change in unrealized gains/losses on hedging activities, net	74					74
Tax expense on unrealized gains on hedging activities, net	(1)					(1)
Common stock and stock-based awards issued and assumed, net of shares withheld for employee taxes (in shares)		10.0
Common stock and stock-based awards issued and assumed, net of shares withheld for employee taxes	(10)			(10)
Common stock repurchased (in shares)		(27.0)
Common stock repurchased	(995)		(995)
Stock-based compensation	449			449
Stock-based compensation tax impact	$ 40			40
Ending balance (in shares) at Dec. 31, 2016	1,207.0	1,207.0
Ending balance at Dec. 31, 2016	$ 14,712		(995)	13,579	0	59	2,069
Increase (Decrease) in Stockholders' Equity
Net income	1,795						1,795
Foreign currency translation	43					43
Unrealized losses on investments, net	(7)					(7)
Tax benefit on unrealized losses on investments, net	1					1
Change in unrealized gains/losses on hedging activities, net	(242)					(242)
Tax expense on unrealized gains on hedging activities, net	4					4
Common stock and stock-based awards issued and assumed, net of shares withheld for employee taxes (in shares)		13.0
Common stock and stock-based awards issued and assumed, net of shares withheld for employee taxes	$ (21)			(21)
Common stock repurchased (in shares)	(19.7)	(20.0)
Common stock repurchased	$ (1,006)		(1,006)
Stock-based compensation	$ 756			756
Ending balance (in shares) at Dec. 31, 2017	1,200.0	1,200.0
Ending balance at Dec. 31, 2017	$ 15,994		$ (2,001)	$ 14,314	$ 0	$ (142)	3,823
Increase (Decrease) in Stockholders' Equity
Income tax adjustment for intra entity transfers	$ (41)						$ (41)