Other Assets (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Other Assets [Line Items]
Capitalized repair and maintenance costs	$ 105	$ 145
Pension assets	225	159
Deferred income taxes	38	41
Asset held for sale		29
Miscellaneous	36	43
Total other assets	404	417
Life insurance policies cash surrender value	63	61
Outstanding loans from policy issuer	63	61
Revolving Credit Facility [Member]
Other Assets [Line Items]
Deferred financing fee	$ 10	$ 13