Changes in Accumulated Other Comprehensive Income Level 4 (Details) - Summary of Changes in Accumulated Other Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	$ (15)	$ 73
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax	4	4	$ 4	$ 4
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	0	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	26	(62)
Other Comprehensive Income (Loss), Net of Tax	26	(62)
Ending Balance	11	11
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	$ 7	$ 7	$ (19)	$ 69