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Investments - Available-for-Sale Investments (Details)
$ in Millions
Mar. 31, 2025
USD ($)
position
Dec. 31, 2024
USD ($)
position
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 679 $ 1,204
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 6 $ 17
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 501 813
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 1,378 $ 1,594
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 57 $ 72
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 710 871
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 492 $ 811
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 5 $ 10
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 358 541
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 766 $ 935
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 18 $ 25
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 365 449
Mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 187 $ 271
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 1 $ 5
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 143 197
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 380 $ 406
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 30 $ 36
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 182 244
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 0 $ 84
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 0 $ 1
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 0 48
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 123 $ 143
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 5 $ 5
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 61 73
Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 0 $ 38
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 0 $ 1
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 0 27
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 94 $ 95
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 3 $ 4
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 85 89
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 $ 15
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 1 $ 2
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 17 16