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Investments - Available-for-Sale (Details) $ in Millions | Dec. 31, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value | $ 1,706 | $ 77
Unrealized Losses | $ 18 | $ 1
Total Number of Positions | security | 677 | 21
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value | $ 1,063 | $ 0
Unrealized Losses | $ 12 | $ 0
Total Number of Positions | security | 395 | 0
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value | $ 408 | $ 77
Unrealized Losses | $ 4 | $ 1
Total Number of Positions | security | 146 | 21
Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value | $ 166 | $ 0
Unrealized Losses | $ 1 | $ 0
Total Number of Positions | security | 75 | 0
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value | $ 69 | $ 0
Unrealized Losses | $ 1 | $ 0
Total Number of Positions | security | 61 | 0

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