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Fair Value Measurements - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Revolving Credit Facility | Variable-Rate Revolving Credit Facilities Due April 2027 | Line of Credit | Lending Joint Ventures |  |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |
Line of credit facility, borrowing capacity increase | $ 75,000,000 |  |  |  |  |
Carrying value |  |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |
Total debt |  | $ 22,300,000,000 |  | $ 22,300,000,000 |  | $ 20,600,000,000
Level 2 | Fair value |  |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |
Total debt |  | 20,700,000,000 |  | 20,700,000,000 |  | 19,200,000,000
Financial Guarantee |  |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |
Carrying value of non-contingent liability |  | 520,000,000 |  | 520,000,000 |  |
Financial Guarantee | Lending Joint Ventures |  |  |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |
Carrying value of non-contingent liability |  | 33,000,000 |  | 33,000,000 |  | $ 40,000,000
Other (expense) income |  | $ 2,000,000 | $ 2,000,000 | $ 7,000,000 | $ 8,000,000 |

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