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Investments - Available-for-Sale Investments (Details) $ in Millions | Sep. 30, 2023 USD ($) position | Dec. 31, 2022 USD ($) position
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 1,363 | $ 1,858
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses | $ 35 | $ 77
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position | 880 | 1,116
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value | $ 2,470 | $ 1,398
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses | $ 183 | $ 135
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position | 1,321 | 624
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 942 | $ 1,124
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses | $ 23 | $ 45
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position | 549 | 683
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value | $ 1,559 | $ 887
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses | $ 98 | $ 76
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position | 785 | 371
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 272 | $ 395
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses | $ 10 | $ 20
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position | 219 | 220
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value | $ 567 | $ 319
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses | $ 57 | $ 36
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position | 297 | 131
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 136 | $ 161
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses | $ 1 | $ 6
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position | 96 | 108
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value | $ 206 | $ 118
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses | $ 16 | $ 14
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position | 100 | 59
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 0 | $ 75
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses | $ 0 | $ 4
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position | 0 | 83
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value | $ 121 | $ 57
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses | $ 10 | $ 7
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position | 123 | 57
U.S. Treasury notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value |  | $ 88
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses |  | $ 1
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position |  | 6
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value |  | $ 0
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses |  | $ 0
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position |  | 0
Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 13 | $ 15
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses | $ 1 | $ 1
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position | 16 | 16
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value | $ 17 | $ 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 | 16 | 6

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