Commitments and Contingencies - Narrative (Details) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Commitment and Contingencies [Line Items]
Estimate of possible loss	$ 71,000,000
Loss accrual	24,000,000
Indirect tax contingency	20,000,000
Discontinued Operations [Member]
Commitment and Contingencies [Line Items]
Estimate of possible loss	42,000,000
Loss accrual	12,000,000
Indirect tax contingency	17,000,000
Senior Notes [Member]
Commitment and Contingencies [Line Items]
Debt instrument, face amount	$ 38,995,000,000	$ 29,008,000,000