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Debt and Capital Leases - Senior Note Redemptions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Jun. 30, 2018	Dec. 07, 2017
Debt Instrument [Line Items]
Loss on debt extinguishment	$ 44	$ 49	$ 142
Senior notes
Debt Instrument [Line Items]
Loss on debt extinguishment	38
Write off of deferred debt issuance cost	7
Recourse Debt | Senior notes
Debt Instrument [Line Items]
Principal amount redeemed		1,500
Loss on debt extinguishment		49
Write off of deferred debt issuance cost		7
Principal Repurchased	1,061	1,473		$ 576	$ 43
Cash Paid	$ 1,106	1,544		$ 598	$ 45
Average Early Redemption Percentage	25.00%
Accrued interest		$ 29
Recourse Debt | Senior notes, due 2018
Debt Instrument [Line Items]
Interest rate, stated percentage		7.625%
Principal Repurchased		$ 398
Cash Paid		$ 411
Average Early Redemption Percentage		101.42%
Recourse Debt | Senior notes, due 2021
Debt Instrument [Line Items]
Interest rate, stated percentage		7.875%
Principal Repurchased		$ 206
Cash Paid		$ 218
Average Early Redemption Percentage		102.63%
Recourse Debt | Senior notes, due 2023
Debt Instrument [Line Items]
Interest rate, stated percentage		6.625%				6.625%
Principal Repurchased		$ 869
Cash Paid		$ 915
Average Early Redemption Percentage		103.57%

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