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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] - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | $ (6) | $ (4)
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 | (110) | 7
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities | 12 | (4)
Significant Unobservable Inputs (Level 3) | Contingent Consideration |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities | 12 | (4)
Significant Unobservable Inputs (Level 3) | Liability [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities | 48 | (4)
Significant Unobservable Inputs (Level 3) | 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, Liabilities | 0 | 0
Significant Unobservable Inputs (Level 3) | 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
Significant Unobservable Inputs (Level 3) | 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 | (6) | 0
Significant Unobservable Inputs (Level 3) | 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
Significant Unobservable Inputs (Level 3) | Freestanding Derivatives, net |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Derivatives | 0 | (3)
Significant Unobservable Inputs (Level 3) | Freestanding Derivatives, net | Liability [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Derivatives | 0 | 0
Significant Unobservable Inputs (Level 3) | 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)
Significant Unobservable Inputs (Level 3) | Freestanding Derivatives, net | Equity | Liability [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Derivatives |  | 0
Significant Unobservable Inputs (Level 3) | 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 | (1)
Significant Unobservable Inputs (Level 3) | Freestanding Derivatives, net | 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, Derivatives | 0 | 0
Significant Unobservable Inputs (Level 3) | Freestanding Derivatives, net | Other Comprehensive Income (Loss) [Member] | Liability [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Derivatives | 0 | 0
Significant Unobservable Inputs (Level 3) | 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
Significant Unobservable Inputs (Level 3) | Freestanding Derivatives, net | Other Comprehensive Income (Loss) [Member] | Equity | Liability [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Derivatives | 0 | 0
Significant Unobservable Inputs (Level 3) | 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
Significant Unobservable Inputs (Level 3) | 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 | 0 | (1)
Significant Unobservable Inputs (Level 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 | (110) | 7
Significant Unobservable Inputs (Level 3) | Total Fixed Maturities, AFS | ABS | 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
Significant Unobservable Inputs (Level 3) | Total Fixed Maturities, AFS | ABS | 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
Significant Unobservable Inputs (Level 3) | 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
Significant Unobservable Inputs (Level 3) | 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 | (6) | 0
Significant Unobservable Inputs (Level 3) | 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
Significant Unobservable Inputs (Level 3) | 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 | 0 | 1
Significant Unobservable Inputs (Level 3) | 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 | 0 | (1)
Significant Unobservable Inputs (Level 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 | (79) | 7
Significant Unobservable Inputs (Level 3) | 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
Significant Unobservable Inputs (Level 3) | 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 | $ (24) | $ (1)

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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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- Definition Amount of unrealized gain (loss) recognized in income for derivative asset (liability) after deduction of derivative liability (asset), measured at fair value 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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