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Investments - Balances of Restricted Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]    
Restricted investments $ 261 $ 238
Cash and cash equivalents    
Schedule of Held-to-maturity Securities [Line Items]    
Restricted investments 60 42
U.S. Treasury notes    
Schedule of Held-to-maturity Securities [Line Items]    
Restricted investments 167 159
Corporate debt securities    
Schedule of Held-to-maturity Securities [Line Items]    
Restricted investments $ 34 $ 37