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Debt and Capital Leases - Senior Notes Repurchased (Details) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Nov. 05, 2018 USD ($)	Oct. 09, 2018 USD ($)
Debt Instrument, Redemption [Line Items]
Loss on debt extinguishment, net	$ 19		$ 0	$ 22	$ 0
Senior Notes
Debt Instrument, Redemption [Line Items]
Loss on debt extinguishment, net				22
Write-off of deferred financing costs				$ 6
Recourse Debt | 5.750% senior notes due 2028
Debt Instrument, Redemption [Line Items]
Interest rate, stated percentage	5.75%			5.75%
Principal amount repurchased	$ 20	$ 29		$ 20
Cash Paid	$ 20	$ 30		$ 20
Average Early Redemption Percentage	99.13%	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	$ 492	$ 14		$ 492
Cash Paid	$ 512	$ 15		512
Average Early Redemption Percentage	103.13%	103.25%
Partial redemption	$ 486
Recourse Debt | Senior Notes
Debt Instrument, Redemption [Line Items]
Principal amount repurchased	575	$ 43		575
Cash Paid	598	$ 45		598
Accrued interest	$ 7			$ 7
Recourse Debt | 6.625% senior notes due 2027
Debt Instrument, Redemption [Line Items]
Interest rate, stated percentage	6.625%			6.625%
Principal amount repurchased	$ 20			$ 20
Cash Paid	$ 21			21
Average Early Redemption Percentage	103.06%
Transformation Plan
Debt Instrument, Redemption [Line Items]
Partial redemption				$ 640
Target net debt to EBITDA credit ratio				3.0
Subsequent Event | Recourse Debt | 6.250% senior notes due 2022
Debt Instrument, Redemption [Line Items]
Interest rate, stated percentage							6.25%
Principal amount repurchased							$ 485
Subsequent Event | Recourse Debt | Term loan facility, due 2023
Debt Instrument, Redemption [Line Items]
Cash Paid						$ 155

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