Basis of Presentation and Summary of Significant Accounting Policies - Comprehensive Earnings (Loss) - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
COMPREHENSIVE EARNINGS (LOSS)
U.S. federal statutory tax rate (as a percent)	21.00%	21.00%
Other comprehensive earnings (loss), tax (benefit)	$ (7)	$ 8
Unrealized gains (loss), net of tax, recognized in other comprehensive earnings (loss)	$ (25)	$ 30

Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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+ Details