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Summary of Significant Accounting Policies - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | $ 10,901 | $ 13,854 | $ 19,123
Other comprehensive income | 55 | 113 | 247
Balance at end of period | 8,650 | 10,901 | 13,854
Total |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (10) | (123) | (370)
Other comprehensive income | 55 | 113 | 247
Balance at end of period | 45 | (10) | (123)
Unrealized Gains on Available-for-Sale Securities |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | 10 | (114) |
Other comprehensive income | 28 | 124 |
Balance at end of period | 38 | 10 | (114)
Pension and Postretirement Obligation Adjustments |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (12) | (9) |
Other comprehensive income | 16 | (3) |
Balance at end of period | 4 | (12) | (9)
Losses (gains) on Foreign Currency Translation |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (8) | 0 |
Other comprehensive income | 11 | (8) |
Balance at end of period | $ 3 | $ (8) | $ 0

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