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Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale $ 43,055 $ 40,626
Corporate bonds and other    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 25,792 24,268
States, municipalities and political subdivisions    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 7,148 7,392
Asset-backed    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 8,628 7,901
Fair Value, Recurring    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 42,527 40,425
Fixed maturities trading 528 201
Total fixed maturities 43,055 40,626
Equity securities 1,215 1,050
Short-term and other 5,073 4,247
Receivables 6 13
Payable to brokers (57) (62)
Fair Value, Recurring | Corporate bonds and other    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 26,751 25,132
Fair Value, Recurring | States, municipalities and political subdivisions    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 7,148 7,392
Fair Value, Recurring | Asset-backed    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 8,628 7,901
Level 1 | Fair Value, Recurring    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 225 161
Fixed maturities trading 528 201
Total fixed maturities 753 362
Equity securities 765 586
Short-term and other 5,043 4,215
Receivables
Payable to brokers (57) (62)
Level 1 | Fair Value, Recurring | Corporate bonds and other    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 225 161
Level 1 | Fair Value, Recurring | States, municipalities and political subdivisions    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale
Level 1 | Fair Value, Recurring | Asset-backed    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale
Level 2 | Fair Value, Recurring    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 40,105 38,274
Fixed maturities trading
Total fixed maturities 40,105 38,274
Equity securities 436 440
Short-term and other 30 32
Receivables 6 13
Payable to brokers
Level 2 | Fair Value, Recurring | Corporate bonds and other    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 25,289 23,926
Level 2 | Fair Value, Recurring | States, municipalities and political subdivisions    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 7,103 7,348
Level 2 | Fair Value, Recurring | Asset-backed    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 7,713 7,000
Level 3 | Fair Value, Recurring    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 2,197 1,990
Fixed maturities trading
Total fixed maturities 2,197 1,990
Equity securities 14 24
Short-term and other
Receivables
Payable to brokers
Level 3 | Fair Value, Recurring | Corporate bonds and other    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 1,237 1,045
Level 3 | Fair Value, Recurring | States, municipalities and political subdivisions    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 45 44
Level 3 | Fair Value, Recurring | Asset-backed    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale $ 915 $ 901