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Investments - Available-for-Sale (Details)
$ in Millions
Dec. 31, 2024
USD ($)
position
Dec. 31, 2023
USD ($)
position
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 1,204 $ 386
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 17 $ 3
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 813 258
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 1,594 $ 2,431
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 72 $ 126
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 871 1,261
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 811 $ 263
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 10 $ 1
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 541 160
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 935 $ 1,553
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 25 $ 64
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 449 754
Mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 271 $ 123
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 5 $ 2
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 197 98
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 406 $ 549
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 36 $ 42
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 244 283
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 84 $ 0
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 1 $ 0
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 48 0
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 143 $ 195
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 5 $ 12
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 73 91
Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 38 $ 0
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 1 $ 0
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 27 0
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 95 $ 117
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 4 $ 6
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 89 116
Other    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 0 $ 0
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 0 $ 0
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 0 0
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 15 $ 17
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 2 $ 2
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 16 17