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Fair Value Measurements - Changes in Unrealized Gains (Losses) Included in Net Income for Financial Instruments Classified as Level 3 Still Held at Year End (Details) - Fair Value, Recurring [Member] - Significant Unobservable Inputs (Level 3) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | $ (4) | $ (4) | $ (33) | $ (6)
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities | 0 | (2) | 12 | (14)
Contingent Consideration |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities | 0 | 0 | 12 | (6)
Other Comprehensive Income (Loss) [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 24 | (3) | (5) | 6
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities | 0 | 0 | 0 | 0
Other Comprehensive Income (Loss) [Member] | Contingent Consideration |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities | 0 | 0 | 0 | 0
Equity Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 0 | (2) | (9) | (2)
Equity Securities [Member] | Other Comprehensive Income (Loss) [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 0 | 0 | 0 | 0
Freestanding Derivatives, net | Other liabilities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Derivatives | 0 | (2) | 0 | (8)
Freestanding Derivatives, net | Other investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Derivatives | 0 | 0 | 0 | (1)
Freestanding Derivatives, net | Equity |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Derivatives | 0 | (2) | 0 | (8)
Freestanding Derivatives, net | Equity | Other investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Derivatives | 0 | 0 | 0 | 0
Freestanding Derivatives, net | Interest rate derivatives |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Derivatives | 0 | 0 | 0 | (1)
Freestanding Derivatives, net | Other Comprehensive Income (Loss) [Member] | Other liabilities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Derivatives | 0 | 0 | 0 | 0
Freestanding Derivatives, net | Other Comprehensive Income (Loss) [Member] | Other investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Derivatives | 0 | 0 | 0 | 0
Freestanding Derivatives, net | Other Comprehensive Income (Loss) [Member] | Equity |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Derivatives | 0 | 0 | 0 | 0
Freestanding Derivatives, net | Other Comprehensive Income (Loss) [Member] | Equity | Other investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Derivatives | 0 | 0 | 0 | 0
Freestanding Derivatives, net | Other Comprehensive Income (Loss) [Member] | Interest rate derivatives |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Derivatives | 0 | 0 | 0 | 0
Total Fixed Maturities, AFS | Securities available-for-sale and other |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | (4) | (2) | (24) | (3)
Total Fixed Maturities, AFS | Securities available-for-sale and other | Other Comprehensive Income (Loss) [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 24 | (3) | (5) | 6
Total Fixed Maturities, AFS | Collateralized loan obligations ("CLOs") | Securities available-for-sale and other |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 0 | 0 | 0 | 0
Total Fixed Maturities, AFS | Collateralized loan obligations ("CLOs") | Securities available-for-sale and other | Other Comprehensive Income (Loss) [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 1 | 0 | (1) | 1
Total Fixed Maturities, AFS | CMBS | Securities available-for-sale and other |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 0 | 0 | 0 | 0
Total Fixed Maturities, AFS | CMBS | Securities available-for-sale and other | Other Comprehensive Income (Loss) [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 2 | 0 | 2 | 0
Total Fixed Maturities, AFS | Corporate | Securities available-for-sale and other |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | (1) | (2) | (21) | (3)
Total Fixed Maturities, AFS | Corporate | Securities available-for-sale and other | Other Comprehensive Income (Loss) [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 17 | 0 | 1 | 8
Total Fixed Maturities, AFS | Foreign Government/Government Agencies | Securities available-for-sale and other |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 0 | 0 | 0 | 0
Total Fixed Maturities, AFS | Foreign Government/Government Agencies | Securities available-for-sale and other | Other Comprehensive Income (Loss) [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 0 | 0 | 0 | 1
Total Fixed Maturities, AFS | Municipal | Securities available-for-sale and other |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | (3) | 0 | (3) | 0
Total Fixed Maturities, AFS | Municipal | Securities available-for-sale and other | Other Comprehensive Income (Loss) [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 2 | 0 | 2 | 0
Total Fixed Maturities, AFS | RMBS | Securities available-for-sale and other |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 0 | 0 | 0 | 0
Total Fixed Maturities, AFS | RMBS | Securities available-for-sale and other | Other Comprehensive Income (Loss) [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | $ 2 | $ (3) | $ (9) | $ (4)

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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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- Definition Amount of unrealized gain (loss) recognized in income from liability 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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