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Investments - Available-for-Sale Investments (Details)
$ in Millions
Jun. 30, 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 $ 401 $ 1,204
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 4 $ 17
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 154 813
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 1,143 $ 1,594
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 47 $ 72
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 657 871
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 236 $ 811
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 2 $ 10
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 28 541
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 594 $ 935
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 13 $ 25
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 286 449
Mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 165 $ 271
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 2 $ 5
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 126 197
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 359 $ 406
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 27 $ 36
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 227 244
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 $ 107 $ 143
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 3 $ 5
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 53 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 $ 68 $ 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 75 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 16 16