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Investments - Available-for-Sale Investments (Details) $ in Millions | Jun. 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 | $ 792 | $ 386
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses | $ 7 | $ 3
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position | 538 | 258
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value | $ 2,395 | $ 2,431
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses | $ 114 | $ 126
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position | 1,272 | 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 | $ 648 | $ 263
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses | $ 5 | $ 1
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position | 421 | 160
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value | $ 1,524 | $ 1,553
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses | $ 52 | $ 64
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position | 725 | 754
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 144 | $ 123
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses | $ 2 | $ 2
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position | 117 | 98
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value | $ 516 | $ 549
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses | $ 43 | $ 42
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position | 314 | 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 | $ 220 | $ 195
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses | $ 10 | $ 12
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position | 104 | 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 | $ 113 | $ 117
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses | $ 7 | $ 6
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position | 108 | 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 | $ 22 | $ 17
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 | 21 | 17

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