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Investments - Amortized Cost and Fair Value by Maturity Dates (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Amortized Cost    
Within one year $ 719 $ 1,280
Total 719 1,280
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract]    
Within one year 719 1,280
Total $ 719 $ 1,280