v3.26.1
Investments - Available-for-Sale Investments (Details)
$ in Millions
Jun. 30, 2026
USD ($)
position
Dec. 31, 2025
USD ($)
position
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 1,351 $ 106
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 11 $ 1
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 850 83
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 592 $ 823
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 30 $ 31
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 398 523
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 900 $ 106
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 7 $ 1
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 578 83
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 233 $ 372
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 133 205
Mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 313 $ 0
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 3 $ 0
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 198 0
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 247 $ 315
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 22 $ 21
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 180 212
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 138 $ 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 74 0
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 61 $ 80
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 29 41
Municipal securities    
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 $ 38 $ 42
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 1 $ 1
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 40 49
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 $ 13 $ 14
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 1 $ 1
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 16 16