Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2019

Equity [Abstract]

Summary of Changes in Accumulated Other Comprehensive Income (Loss)

Accumulated Other Comprehensive Income (Loss)

The following table summarizes the changes in AOCI by component, net of tax during the six months ended June 30, 2019 and 2018 (in millions):

	Foreign Currency Translation		Unrealized Gains and Losses on Available-for-Sale Debt Securities			Unrealized Gains and Losses on Cash Flow Hedges			Total
Balance at December 31, 2018	$	47	$	(52	)	$	85		$	80
Net unrealized gain	8		49			29			86
Reclassifications to net income	—		—			(64		)	(64		)
Net current period other comprehensive income (loss)	8		49			(35		)	22
Balance at June 30, 2019	$	55	$	(3	)	$	50		$	102

	Foreign Currency Translation			Unrealized Gains and Losses on Available-for-Sale Debt Securities			Unrealized Gains and Losses on Cash Flow Hedges			Total
Balance at December 31, 2017	$	85		$	194		$	(114	)	$	165
Reclassifications to retained earnings as a result of the adoption of new accounting standards	—			(293		)	—			(293		)
Balance at January 1, 2018	85			(99		)	(114		)	(128		)
Net unrealized gain (loss)	(18		)	(6		)	57			33
Reclassifications to net income	—			4			93			97
Net current period other comprehensive income (loss)	(18		)	(2		)	150			130
Balance at June 30, 2018	$	67		$	(101	)	$	36		$	2