Commitments and Contingencies (Leases) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Rental expenses for all leases, including leases with terms of less than one year	$ 45,000,000	$ 72,000,000	$ 95,000,000
Depreciation expense for assets held under capital lease	23,000,000	23,000,000	$ 21,000,000
Aggregate carrying amount of assets held under capital lease
Property and equipment, cost	776,000,000	774,000,000
Accumulated depreciation	(149,000,000)	(125,000,000)
Property and equipment, net	627,000,000	$ 649,000,000
Capital lease, future minimum rental payments
2017	66,000,000
2018	72,000,000
2019	72,000,000
2020	72,000,000
2021	71,000,000
Thereafter	550,000,000
Total future minimum rental payment	903,000,000
Less amount representing imputed interest	(337,000,000)
Present value of future minimum rental payments under capital leases	566,000,000
Less current portion included in debt due within one year	(25,000,000)
Long-term capital lease obligation	541,000,000
Operating leases, future minimum rental payments
2017	10,000,000
2018	11,000,000
2019	10,000,000
2020	9,000,000
2021	9,000,000
Thereafter	42,000,000
Total future minimum rental payment	$ 91,000,000
Capital lease contract due August 2029
Debt Instrument [Line Items]
Implicit interest rate (as a percent)	7.80%
Scheduled monthly payments under capital lease obligation	$ 6,000,000
End of lease obligation	$ 1