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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
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Mar. 31, 2021 | Mar. 31, 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 | $ 18 | $ (29)
Gains (losses) for Level 3 liabilities still held at the balance sheet date, included in earnings | 55 | 48
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date, included in earnings | 73 | 19
Changes in unrealized net capital gains and losses reported in OCI | (4) | (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 | (1) | (14)
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 | 18 | (3)
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 | 55 | 48
Municipal |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |
Changes in unrealized net capital gains and losses reported in OCI | 0 | (1)
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 | 1 | 0
Changes in unrealized net capital gains and losses reported in OCI | (3) | 0
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
Changes in unrealized net capital gains and losses reported in OCI | (1) | 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
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 | 16 | (17)
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 | (12)
Changes in unrealized net capital gains and losses reported in OCI | $ 0 | $ (1)

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- Definition This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets). Such unrealized (holding) gains or losses relate to those assets and liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References No definition available. + Details
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- Definition This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets). Such unrealized (holding) gains or losses relate to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References No definition available. + Details
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- Definition Amount of unrealized and realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References No definition available. + Details
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- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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