Basis Of Presentation And Summary Of Significant Accounting Policies - Schedule of Changes in Noncontrolling Interests (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Equity balance of noncontrolling interests as of January 1			$ 132
Comprehensive income (loss):
Net income	$ 2	$ 2	3	$ 3
Foreign currency adjustments and other	1	$ 0	4	$ (2)
Equity balance of noncontrolling interests as of June 30	$ 139		$ 139