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Debt and Capital Leases - Senior Notes Repurchased (Details) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Aug. 02, 2018 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)
Debt Instrument, Redemption [Line Items]
Loss on debt extinguishment, net		$ 1	$ 0	$ 3	$ 2
Senior Notes
Debt Instrument, Redemption [Line Items]
Loss on debt extinguishment, net				1
Write-off of deferred financing costs				1
Recourse Debt | Senior Notes
Debt Instrument, Redemption [Line Items]
Principal amount repurchased		43		43
Repurchase amount		45		45
Accrued interest		$ 1		$ 1
Recourse Debt | 5.750% senior notes due 2028
Debt Instrument, Redemption [Line Items]
Interest rate, stated percentage		5.75%		5.75%
Principal amount repurchased		$ 29		$ 29
Repurchase amount		$ 30		$ 30
Average Early Redemption Percentage				99.24%
Recourse Debt | 6.250% senior notes due 2022
Debt Instrument, Redemption [Line Items]
Interest rate, stated percentage		6.25%		6.25%
Principal amount repurchased		$ 14		$ 14
Repurchase amount		$ 15		$ 15
Average Early Redemption Percentage				103.25%
Recourse Debt | 6.625% senior notes due 2027
Debt Instrument, Redemption [Line Items]
Interest rate, stated percentage		6.625%		6.625%
Subsequent Event
Debt Instrument, Redemption [Line Items]
Principal amount repurchased	$ 89
Repurchase amount	$ 93
Subsequent Event | Recourse Debt | 5.750% senior notes due 2028
Debt Instrument, Redemption [Line Items]
Interest rate, stated percentage	5.75%
Principal amount repurchased	$ 20
Repurchase amount	$ 21
Average Early Redemption Percentage	99.13%
Subsequent Event | Recourse Debt | 6.250% senior notes due 2022
Debt Instrument, Redemption [Line Items]
Interest rate, stated percentage	6.25%
Principal amount repurchased	$ 6
Repurchase amount	$ 6
Average Early Redemption Percentage	103.25%
Subsequent Event | Recourse Debt | 6.625% senior notes due 2027
Debt Instrument, Redemption [Line Items]
Interest rate, stated percentage	6.25%
Principal amount repurchased	$ 20
Repurchase amount	$ 21
Average Early Redemption Percentage	103.06%
Transformation Plan
Debt Instrument, Redemption [Line Items]
Additional amount committed to reduce debt balance to achieve target debt to EBITDA credit ratio				$ 640
Target net debt to EBITDA credit ratio				3.0

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