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Fair Value - Separate Accounts Fair Value (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | $ 4,793 | $ 4,459
Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 4,793 | 4,459
Cash and cash equivalents | Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 74 | 145
Debt securities | Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 4,114 | 3,813
Equity securities | Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 2 | 2
Common/collective trusts | Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 603 | 499
Level 1 | Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 1,540 | 1,226
Level 1 | Cash and cash equivalents | Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 2 | 2
Level 1 | Debt securities | Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 1,538 | 1,224
Level 1 | Equity securities | Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 0 | 0
Level 1 | Common/collective trusts | Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 0 | 0
Level 2 | Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 3,253 | 3,233
Level 2 | Cash and cash equivalents | Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 72 | 143
Level 2 | Debt securities | Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 2,576 | 2,589
Level 2 | Equity securities | Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 2 | 2
Level 2 | Common/collective trusts | Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 603 | 499
Level 3 | Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 0 | 0
Level 3 | Cash and cash equivalents | Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 0 | 0
Level 3 | Debt securities | Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 0 | 0
Level 3 | Equity securities | Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 0 | 0
Level 3 | Common/collective trusts | Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | $ 0 | $ 0

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