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Fair Value of Assets and Liabilities - Change in level 3 assets and liabilities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Fair value assets measured on recurring basis, change in unrealized gain (loss) included in earnings | $ 6 | $ 36 | $ 10
Gains (losses) for Level 3 liabilities still held at the balance sheet date, included in earnings | (61) | 58 | 0
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date, included in earnings | (55) | 94 | 10
Net investment income |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Gains (losses) for Level 3 assets still held at the balance sheet date | (2) | 0 | 19
Realized capital gains (losses) |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Gains (losses) for Level 3 assets still held at the balance sheet date | 8 | 36 | (8)
Life and annuity contract benefits |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Gains (losses) for Level 3 assets still held at the balance sheet date | 7 | (5) | 9
Interest credited to contractholder funds |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Gains (losses) for Level 3 assets still held at the balance sheet date | (68) | 63 | (10)
Contractholder funds: Derivatives embedded in life and annuity contracts |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Gains (losses) for Level 3 liabilities still held at the balance sheet date, included in earnings | (61) | 58 | 0
Municipal |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Fair value assets measured on recurring basis, change in unrealized gain (loss) included in earnings | 1 | 0 | (3)
Corporate |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Fair value assets measured on recurring basis, change in unrealized gain (loss) included in earnings | 0 | 0 | 1
Fixed income securities |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Fair value assets measured on recurring basis, change in unrealized gain (loss) included in earnings | 1 | 0 | (2)
Equity securities |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Fair value assets measured on recurring basis, change in unrealized gain (loss) included in earnings | 6 | 36 | 13
Free-standing derivatives, net |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Fair value assets measured on recurring basis, change in unrealized gain (loss) included in earnings | (1) | 0 | 0
Other assets |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Fair value assets measured on recurring basis, change in unrealized gain (loss) included in earnings | $ 0 | $ 0 | $ (1)

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