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Investments in Debt and Equity Securities - Summary of Cost Basis And Fair Value Of The Available-For-Sale Debt Securities By Contractual Maturity (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Cost Basis
Due in one year or less	$ 1,027
Due after one year through five years	1,321
Due after five years through ten years	285
Due after ten years	106
Debt securities, available-for-sale, cost basis	3,360	$ 4,114
Fair Value
Due in one year or less	1,024
Due after one year through five years	1,309
Due after five years through ten years	284
Due after ten years	105
Debt securities	3,316	4,042
U.S. governmental agency
Cost Basis
Debt securities, available-for-sale, cost basis	488	476
Fair Value
Debt securities	465	443
Residential
Cost Basis
Debt securities, available-for-sale, cost basis	2	2
Fair Value
Debt securities	2	2
Commercial
Cost Basis
Debt securities, available-for-sale, cost basis	131	136
Fair Value
Debt securities	$ 127	$ 130

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