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Investments - Available-for-Sale Investments (Details) $ in Millions | Sep. 30, 2024 USD ($) position | Dec. 31, 2023 USD ($) 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 | $ 0 | $ 386
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses | $ 0 | $ 3
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position | 0 | 258
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value | $ 1,776 | $ 2,431
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses | $ 66 | $ 126
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position | 952 | 1,261
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 0 | $ 263
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 | 160
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value | $ 1,057 | $ 1,553
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses | $ 26 | $ 64
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position | 506 | 754
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 0 | $ 123
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses | $ 0 | $ 2
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position | 0 | 98
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value | $ 444 | $ 549
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses | $ 29 | $ 42
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position | 256 | 283
Asset-backed 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 | $ 157 | $ 195
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses | $ 6 | $ 12
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position | 77 | 91
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 | $ 102 | $ 117
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 | 97 | 116
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 | $ 16 | $ 17
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 | 17

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