Changes in Accumulated Other Comprehensive Income Level 4 (Details) - Summary of Changes in Accumulated Other Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	$ 11	$ 11	$ (15)	$ 73
Other comprehensive income before reclassifications, net of tax	(26)	13	0	(49)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(25)	13	1	(49)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax	3	4	3	4	$ 4	$ 4		$ 4
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax	(1)	0	(1)	0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	1	0	1	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(25)	13	1	(49)
Other Comprehensive Income (Loss), Net of Tax	(26)	13	0	(49)
Ending Balance	(15)	24	(15)	24
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	$ (18)	$ 20	$ (18)	$ 20	$ 7	$ (19)	$ 7	$ 69
Gains and Losses on Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax							$ 4