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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investments in unconsolidated subsidiaries, fair value | $ 414 | $ 378
Unamortized debt issuance costs | 4,446 | 3,320
2.500% senior notes due in 2031 | Carrying Value | Mortgages |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Unamortized debt issuance costs | 177 | 196
Recurring | Fair Value Measured at Net Asset Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investments at fair value using NAV | 22 | 21
Non-Marketable Equity Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Capital investments | $ 147 | $ 148

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