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Debt and Finance Leases - Senior Credit Facility (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
May 28, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |  |
Repayment of Term Loan Facility |  |  |  | $ 2,487,000,000 | $ 970,000,000 |
Decrease in long-term debt | $ 594,000,000 |  |  |  |  |
Loss on debt extinguishment |  | $ 0 | $ 19,000,000 | 47,000,000 | $ 22,000,000 |
Debt amount |  | 6,257,000,000 |  | 6,257,000,000 |  | $ 6,691,000,000
Recourse Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt amount |  | 6,140,000,000 |  | 6,140,000,000 |  | 6,523,000,000
Recourse Debt | 2023 Term Loan Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayment of Term Loan Facility | 1,700,000,000 |  |  |  |  |
Loss on debt extinguishment | 17,000,000 |  |  |  |  |
Write off of previously deferred debt issuance costs | 13,000,000 |  |  |  |  |
Debt amount |  | 0 |  | 0 |  | 1,698,000,000
Recourse Debt | 2023 Term Loan Facility | Interest Rate Swap Agreements |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Reduction to interest expense | $ 25,000,000 |  |  |  |  |
Revolving Credit Facility | Credit Agreement | Adjusted Base Rate | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 1.25% |  |  |  |  |
Revolving Credit Facility | Credit Agreement | Adjusted Base Rate | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 0.75% |  |  |  |  |
Revolving Credit Facility | Credit Agreement | Eurodollar Rate | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 2.25% |  |  |  |  |
Revolving Credit Facility | Credit Agreement | Eurodollar Rate | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 1.75% |  |  |  |  |
Revolving Credit Facility | Line of Credit | Credit Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amended credit agreement, increase in revolving commitments | $ 184,000,000 |  |  |  |  |
Credit agreement | $ 2,600,000,000 |  |  |  |  |
Debt amount |  | $ 215,000,000 |  | $ 215,000,000 |  | $ 0

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