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Long-term Debt and Finance Leases - Convertible Senior Notes, Receivables Securitization Facilities and Senior Note Repayment (Details) |  |  | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 01, 2024 $ / shares | Jun. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Sep. 30, 2024 USD ($) counterparty $ / shares | Oct. 31, 2024 USD ($) | Jun. 21, 2024 USD ($) | Jun. 20, 2024 USD ($) | Jun. 17, 2024 USD ($) | Apr. 30, 2024 USD ($) | Apr. 16, 2024 | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  |  | $ 10,858,000,000 |  |  |  |  |  |  |  | $ 10,940,000,000
Recourse Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  |  | 8,148,000,000 |  |  |  |  |  |  |  | 8,220,000,000
Aggregate principal redeemed |  |  |  | $ 343,000,000 |  |  |  |  |  |  |  |
Convertible Senior Notes, due 2048 | Recourse Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes, conversion price (in usd per share) | $ / shares |  |  |  | $ 41.11 |  |  |  |  |  |  |  |
Conversion rate |  | 0.0243220 |  |  |  |  |  |  |  |  |  |
Convertible notes, carrying amount |  |  |  | $ 231,000,000 |  |  |  |  |  |  |  | 572,000,000
Convertible notes, threshold percentage of stock price trigger |  |  |  | 130.00% |  |  |  |  |  |  |  |
Convertible notes, threshold trading days | counterparty |  |  |  | 20 |  |  |  |  |  |  |  |
Convertible notes, consecutive trading days | counterparty |  |  |  | 30 |  |  |  |  |  |  |  |
Capped call, convertible debt, conversion, premium |  | $ 257,000,000 | $ 257,000,000 |  |  |  |  |  |  |  |  |
Borrowings outstanding |  | $ 232,000,000 | 232,000,000 | $ 232,000,000 |  |  |  |  |  |  |  | 575,000,000
Capped calls option price |  |  | $ 257,000,000 |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 2.75% |  |  |  |  |  |  |  |
Aggregate principal redeemed |  |  |  |  |  |  |  |  | $ 251,000,000 |  | $ 92,000,000 |
Convertible Senior Notes, due 2048 | Recourse Debt | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes, conversion price (in usd per share) | $ / shares | $ 40.94 |  |  |  |  |  |  |  |  |  |  |
Conversion rate | 0.0244241 |  |  |  |  |  |  |  |  |  |  |
Receivables Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit commitments |  |  |  |  |  | $ 2,300,000,000 | $ 1,400,000,000 |  |  |  |  |
Outstanding borrowing |  |  |  | $ 0 |  |  |  |  |  |  |  |
Receivables Facility | Secured Debt | Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit issued |  |  |  |  |  | $ 1,500,000,000 |  |  |  |  |  |
Senior Secured First Lien Notes, due 2024 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  |  |  |  | 3.75% |  |
Senior Secured First Lien Notes, due 2024 | Recourse Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  |  | $ 0 |  |  |  |  |  |  |  | 600,000,000
Interest rate, stated percentage |  |  |  | 3.75% |  |  |  | 3.75% |  |  |  |
Aggregate principal redeemed |  |  |  |  |  |  |  | $ 600,000,000 |  |  |  |
Senior Notes, due 2027 | Recourse Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  |  | $ 375,000,000 |  |  |  |  |  |  |  | $ 375,000,000
Interest rate, stated percentage |  |  |  | 6.625% |  |  |  |  |  |  |  |
Senior Notes, due 2027 | Recourse Debt | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  | 6.625% |  |  |  |  |  |  |
Aggregate principal redeemed |  |  |  |  | $ 375,000,000 |  |  |  |  |  |  |

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