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Investments - Available-for-Sale (Details) $ in Millions | Dec. 31, 2022 USD ($) position | Dec. 31, 2021 USD ($) position
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 1,858 | $ 1,706
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses | $ 77 | $ 18
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position | 1,116 | 677
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value | $ 1,398 | $ 0
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses | $ 135 | $ 0
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position | 624 | 0
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 1,124 | $ 1,063
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses | $ 45 | $ 12
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position | 683 | 395
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value | $ 887 | $ 0
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses | $ 76 | $ 0
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position | 371 | 0
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 395 | $ 408
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses | $ 20 | $ 4
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position | 220 | 146
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value | $ 319 | $ 0
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses | $ 36 | $ 0
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position | 131 | 0
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 161 | $ 166
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses | $ 6 | $ 1
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position | 108 | 75
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value | $ 118 | $ 0
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses | $ 14 | $ 0
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position | 59 | 0
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 75 | $ 69
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses | $ 4 | $ 1
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position | 83 | 61
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value | $ 57 | $ 0
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses | $ 7 | $ 0
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position | 57 | 0
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 | $ 15 |
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 | 16 |
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value | $ 17 |
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses | $ 2 |
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position | 6 |

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