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Fair Value of Assets and Liabilities - Change in unrealized gains and losses included in net income for level 3 assets and liabilities (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
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 | $ 11 | $ 3 | $ 25 | $ (15)
Gains (losses) for Level 3 liabilities still held at the balance sheet date, included in earnings | 15 | (6) | 46 | (27)
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date, included in earnings | 26 | (3) | 71 | (42)
Gains (losses) for Level 3 assets still held at the balance sheet date | 10 | 1 | 22 | (13)
Changes in unrealized net capital gains and losses reported in OCI | 0 | 2 | 0 | (2)
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 | 6 | (1) | (1) | (15)
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 | 4 | 2 | 23 | 2
Liabilities held for sale |  |  |  |
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 | 15 | (6) | 46 | (27)
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 | 0 | 0
Changes in unrealized net capital gains and losses reported in OCI | (1) | 1 | 0 | 0
Corporate - public |  |  |  |
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 | 0 | (1)
Changes in unrealized net capital gains and losses reported in OCI | 0 | 0 | (1) | 1
Corporate - privately placed |  |  |  |
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 | 0 | 0
Changes in unrealized net capital gains and losses reported in OCI | 1 | 0 | 1 | 0
ABS |  |  |  |
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 | 0 | (1)
Changes in unrealized net capital gains and losses reported in OCI | 0 | 1 | 0 | 0
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 | 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 | 9 | 0 | 22 | (12)
Short-term investments |  |  |  |
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 | 1 | 0 | 1
Assets held for sale |  |  |  |
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 | 2 | 3 | (2)
Changes in unrealized net capital gains and losses reported in OCI | $ 0 | $ 0 | $ 0 | $ (3)

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