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Fair Value - Separate Accounts Fair Value (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | $ 4,590 | $ 3,884
Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 4,331 | 3,693
Debt securities | Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 3,816 | 3,286
Equity securities | Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 2 | 3
Common/collective trusts | Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 513 | 404
Cash and Cash Equivalents |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 259 | 191
Level 1 | Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 1,207 | 782
Level 1 | Debt securities | Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 1,207 | 782
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 | 3,124 | 2,907
Level 2 | Debt securities | Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 2,609 | 2,500
Level 2 | Equity securities | Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 2 | 3
Level 2 | Common/collective trusts | Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 513 | 404
Level 3 | Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 0 | 4
Level 3 | Debt securities | Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 0 | 4
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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