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Investments - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]          
Available-for-sale debt securities $ 0   $ 0   $ 0
Debt securities in an unrealized loss position 406,000,000   406,000,000   777,000,000
Debt securities, unrealized loss     13,000,000   16,000,000
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss 202,000,000   202,000,000   283,000,000
Debt securities, continuous unrealized loss position, 12 months or longer 12,000,000   12,000,000   14,000,000
Equity securities without readily determinable fair value, carrying value 38,000,000   38,000,000   $ 83,000,000
Impairment loss 0 $ 0 45,000,000 $ 0  
Upward adjustments 0 0   0  
Downward adjustments 0 $ 0   $ 0  
Cumulative downward adjustments for observable price changes and impairment $ 101,000,000   $ 101,000,000