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Assets and Liabilities Measured at Fair Value - Realized and Unrealized Gains (Losses) on Financial Instruments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Assets and Liabilities Measured at Fair Value |  |  |  |
Realized and unrealized gains (losses) on financial instruments, net | $ (1) | $ 160 | $ 56 | $ 235
Debt measured at fair value |  |  |  |
Assets and Liabilities Measured at Fair Value |  |  |  |
Realized and unrealized gains (losses) on financial instruments, net | (37) | (53) | 11 | (44)
Gain (loss) on changes in fair value | 0 | 1 | 0 | (5)
Cumulative amount of gain (loss) in changes in fair value | 65 |  | 65 |
Foreign currency forward contracts |  |  |  |
Assets and Liabilities Measured at Fair Value |  |  |  |
Realized and unrealized gains (losses) on financial instruments, net | 2 | 227 | (3) | 335
Interest rate swaps |  |  |  |
Assets and Liabilities Measured at Fair Value |  |  |  |
Realized and unrealized gains (losses) on financial instruments, net | 27 | (18) | 42 | (53)
Other |  |  |  |
Assets and Liabilities Measured at Fair Value |  |  |  |
Realized and unrealized gains (losses) on financial instruments, net | $ 7 | $ 4 | $ 6 | $ (3)

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