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Long-term Debt and Finance Leases - Recourse Debt (Details) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 24, 2021 | Aug. 23, 2021 | Jul. 26, 2021 | Nov. 04, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal redeemed | $ 1,400,000,000 |  |  |  |  |  |  |  |
Cash paid | 1,400,000,000 |  |  |  |  |  |  |  |
Loss on debt extinguishment, net | $ 57,000,000 |  |  |  | $ (57,000,000) | $ 0 | $ (57,000,000) | $ (1,000,000) |
Write off of previously deferred debt issuance costs |  |  |  |  |  |  | 9,000,000 |  |
Senior Notes, due 2032 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt issuance amount |  | $ 1,100,000,000 |  |  |  |  |  |  |
Interest rate, stated percentage |  | 3.875% |  |  |  |  |  |  |
Increase basis point, interest rate payable if sustainability targets not met |  | 0.25% |  |  |  |  |  |  |
Senior Notes, due 2026 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate, stated percentage | 7.25% |  |  |  |  |  |  |  |
Aggregate principal redeemed | $ 1,000,000,000 |  |  |  |  |  |  |  |
Cash paid | $ 1,056,000,000 |  |  |  |  |  |  |  |
Senior Notes, due 2027 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate, stated percentage | 6.625% |  |  |  |  |  |  |  |
Aggregate principal redeemed | $ 355,000,000 |  |  |  |  |  |  |  |
Cash paid | $ 369,000,000 |  |  |  |  |  |  |  |
Senior Notes, due 2027 | Subsequent Event |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 6.625% |  |  |  |  |
Aggregate principal redeemed |  |  |  | $ 500,000,000 |  |  |  |  |
Cash paid |  |  |  | $ 524,000,000 |  |  |  |  |
Receivables Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Increase to existing revolving commitments |  |  | $ 50,000,000 |  |  |  |  |  |
Revolving credit commitments |  |  | $ 800,000,000 |  |  |  |  |  | $ 750,000,000
Borrowings outstanding |  |  |  |  | 0 |  | 0 |  |
Letters of credit issued |  |  |  |  | 400,000,000 |  | 400,000,000 |  |
Repurchase Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Revolving credit commitments |  |  |  |  |  |  |  |  | 75,000,000
Credit agreement | Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Revolving credit commitments |  |  |  |  |  |  |  |  | $ 273,000,000
Increase revolving commitments |  |  |  |  |  | $ 802,000,000 |  |  |
Total revolving commitments available |  |  |  |  | $ 3,700,000,000 |  | $ 3,700,000,000 |  |

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