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v3.25.1

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

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