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Investments - Available-for-Sale Investments (Details) $ in Millions | Sep. 30, 2022 USD ($) security position | Dec. 31, 2021 USD ($) position security
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Debt Securities, Available-for-sale [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 2,815 | $ 1,706
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses | $ 163 | $ 18
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position | 1,457 | 677
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value | $ 708 | $ 0
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses | $ 80 | $ 0
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | 305 | 0
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 1,764 | $ 1,063
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses | $ 103 | $ 12
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position | 909 | 395
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value | $ 433 | $ 0
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses | $ 45 | $ 0
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position | 167 | 0
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 555 | $ 408
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses | $ 36 | $ 4
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position | 282 | 146
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value | $ 188 | $ 0
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses | $ 25 | $ 0
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position | 75 | 0
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 242 | $ 166
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses | $ 13 | $ 1
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | security | 128 | 75
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value | $ 56 | $ 0
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses | $ 6 | $ 0
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | security | 28 | 0
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 106 | $ 69
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses | $ 7 | $ 1
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | security | 110 | 61
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value | $ 31 | $ 0
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses | $ 4 | $ 0
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | security | 35 | 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 | $ 116 |
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 | security | 8 |
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 | security | 0 |
Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 32 |
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses | $ 3 |
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | security | 20 |
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 | security | 0 |

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