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Debt Investments (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]      
Proceeds from sales of available-for-sale securities $ 154 $ 721  
Gross realized gains 2 9  
Available-for-sale Securities, Gross Realized Losses (1) (5)  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost 110    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value 100    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost 1,188    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value 1,094    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost 426    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value 412    
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost 524    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value 425    
Debt Securities, Available-for-sale, Amortized Cost 2,248    
Debt Securities, Available-for-sale 2,031    
Equity Securities, Net Unrealized Gain (Loss) 3 $ 0  
Equity Securities, FV-NI, Current 11   $ 14
Equity Securities without Readily Determinable Fair Value, Amount $ 149   $ 153