Commitments and Contingencies - Material Contractual Obligations, Commercial Commitments and Outstanding Debt (Parenthetical) (Details) - USD ($) $ in Millions		Dec. 31, 2016	Dec. 31, 2015
Commitments And Contingencies Disclosure [Abstract]
Unrecognized tax benefits	[1]	$ 108	$ 87

[1] See “Note 10—Income Taxes” for additional information on our unrecognized tax benefits. Amount includes accrued interest related to this liability.