Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2017

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule of accumulated other comprehensive income (loss)

The components of accumulated other comprehensive income (loss) were as follows (amounts in millions):

	For the Year Ended December 31, 2017
	Foreign currency translation adjustments			Unrealized gain (loss) on available-for- sale securities			Unrealized gain (loss) on forward contracts			Total
Balance at December 31, 2016	$	(659	)	$	1		$	29		$	(629	)
Other comprehensive income (loss) before reclassifications	20			(1		)	(45		)	(26		)
Amounts reclassified from accumulated other comprehensive income (loss) into earnings	16			—			1			17
Balance at December 31, 2017	$	(623	)	$	—		$	(15	)	$	(638	)

	For the Year Ended December 31, 2016
	Foreign currency translation adjustments			Unrealized gain (loss) on available-for- sale securities		Unrealized gain (loss) on forward contracts			Total
Balance at December 31, 2015	$	(630	)	$	1	$	(4	)	$	(633	)
Other comprehensive income (loss) before reclassifications	(29		)	—		37			8
Amounts reclassified from accumulated other comprehensive income (loss) into earnings	—			—		(4		)	(4		)
Balance at December 31, 2016	$	(659	)	$	1	$	29		$	(629	)