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Fair Value - Separate Accounts Fair Value (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | $ 4,140 | $ 5,087
Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 4,052 | 5,017
Recurring | Other Receivables |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 88 | 70
Recurring | Cash and cash equivalents |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 182 | 188
Recurring | Debt securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 3,448 | 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 | 421 | 547
Recurring | Level 1 |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 917 | 1,235
Recurring | Level 1 | Cash and cash equivalents |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 4 | 2
Recurring | Level 1 | Debt securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 913 | 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 | 3,135 | 3,782
Recurring | Level 2 | Cash and cash equivalents |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 178 | 186
Recurring | Level 2 | Debt securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 2,535 | 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 | 421 | 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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