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Fair Value - Separate Accounts Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | $ 4,459 | $ 3,884
Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 4,459 | 3,884
Recurring | Cash and cash equivalents |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 145 | 191
Recurring | Debt securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 3,813 | 3,286
Recurring | Equity securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 2 | 3
Recurring | Common/collective trusts |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 499 | 404
Recurring | Level 1 |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 1,226 | 784
Recurring | Level 1 | Cash and cash equivalents |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 2 | 2
Recurring | Level 1 | Debt securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 1,224 | 782
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 | 3,233 | 3,096
Recurring | Level 2 | Cash and cash equivalents |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 143 | 189
Recurring | Level 2 | Debt securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 2,589 | 2,500
Recurring | Level 2 | Equity securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 2 | 3
Recurring | Level 2 | Common/collective trusts |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 499 | 404
Recurring | Level 3 |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 0 | 4
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 | 4
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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