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Fair Value - Separate Accounts Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | $ 4,670 | $ 5,087
Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 4,585 | 5,017
Recurring | Other Receivables |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 85 | 70
Recurring | Cash and cash equivalents |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 196 | 188
Recurring | Debt securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 3,888 | 4,281
Recurring | Equity securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 1 | 1
Recurring | Common/collective trusts |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 500 | 547
Recurring | Level 1 |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 1,098 | 1,235
Recurring | Level 1 | Cash and cash equivalents |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 3 | 2
Recurring | Level 1 | Debt securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 1,095 | 1,233
Recurring | Level 1 | Equity securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 0 | 0
Recurring | Level 1 | Common/collective trusts |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 0 | 0
Recurring | Level 2 |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 3,487 | 3,782
Recurring | Level 2 | Cash and cash equivalents |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 193 | 186
Recurring | Level 2 | Debt securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 2,793 | 3,048
Recurring | Level 2 | Equity securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 1 | 1
Recurring | Level 2 | Common/collective trusts |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 500 | 547
Recurring | Level 3 |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 0 | 0
Recurring | Level 3 | Cash and cash equivalents |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 0 | 0
Recurring | Level 3 | Debt securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 0 | 0
Recurring | Level 3 | Equity securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 0 | 0
Recurring | Level 3 | Common/collective trusts |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | $ 0 | $ 0

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