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Variable Interest Entities - Schedule of Investments, Proportional Amortization Method (Details) - USD ($) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |
Proportional amortization | $ 54,000,000 | $ 50,000,000 | $ 160,000,000 | $ 150,000,000
Tax credits and other benefits | (71,000,000) | (67,000,000) | (199,000,000) | (190,000,000)
Changes in carrying amounts of equity method investments | 2,000,000 | 2,000,000 | 6,000,000 | 6,000,000
Impairment losses | $ 0 | $ 0 | $ 0 | $ 0

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