Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2016

Equity [Abstract]

Accumulated Other Comprehensive Loss Primarily Comprised of Accumulated Foreign Currency Translation Adjustments

Accumulated other comprehensive loss is primarily comprised of accumulated foreign currency translation adjustments, as follows for the periods presented:

	December 31, 2016			December 31, 2015
	(in millions)
Cumulative foreign currency translation    adjustments (1)	$	(77	)	$	(63	)
Total accumulated other comprehensive loss (2)	$	(77	)	$	(63	)

(1) We consider our foreign subsidiary earnings indefinitely reinvested; therefore; deferred taxes are not provided on foreign currency translation adjustments.

(2) Our accumulated net unrealized gain (loss) on available for sale securities was not material as of December 31, 2016 and December 31, 2015.