Intangible Assets - Textuals (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Intangible Assets with Definite Lives:
Amortization expense	$ 8	$ 7	$ 7
Assets classified as held for sale	$ 0	$ 5
Customer relationships
Intangible Assets with Definite Lives:
Weighted average amortization period	10 years
Other
Intangible Assets with Definite Lives:
Weighted average amortization period	11 years