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v3.25.3

Investments - Available-for-Sale Investments (Details) $ in Millions | Sep. 30, 2025 USD ($) position | Dec. 31, 2024 USD ($) position
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Debt Securities, Available-for-sale [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 92 | $ 1,204
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses | $ 1 | $ 17
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position | 65 | 813
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value | $ 995 | $ 1,594
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses | $ 38 | $ 72
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position | 583 | 871
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 0 | $ 811
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses | $ 0 | $ 10
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position | 0 | 541
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value | $ 493 | $ 935
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses | $ 9 | $ 25
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position | 243 | 449
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 92 | $ 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 | 65 | 197
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value | $ 339 | $ 406
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses | $ 23 | $ 36
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position | 212 | 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 | $ 87 | $ 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 | 44 | 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 | $ 62 | $ 95
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses | $ 2 | $ 4
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position | 67 | 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 | $ 14 | $ 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

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