Changes in Accumulated Other Comprehensive Income Level 4 (Details) - Summary of Changes in Accumulated Other Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	$ 24	$ 129	$ 73	$ 130
Other comprehensive income before reclassifications, net of tax	(24)	(40)	(73)	(41)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	24	40	73	41
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax	4	0	4	0	$ 4	$ 4	$ 0	$ 0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax	0	0	0	0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	0		0	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(24)	(40)	(73)	(41)
Other Comprehensive Income (Loss), Net of Tax	(24)	(40)	(73)	(41)
Net Other Comprehensive Income		0
Ending Balance	0	89	0	89
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	$ (4)	$ 89	$ (4)	$ 89	$ 20	$ 69	$ 129	$ 130