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SIGNIFICANT ACCOUNTING POLICIES - Schedule of Balance of and Changes in Liability for Future Policy Benefits (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Liability for Future Policy Benefit, Activity [Line Items] |  |
Less: Reinsurance Recoverable |  | $ (1,896)
Net liability for future policy benefits, after reinsurance recoverable |  | 6,574
Adjustment for reversal of balances recorded in Accumulated Other Comprehensive Income |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Effect of changes in cash flow assumptions |  | (356)
Effect of Remeasurement of Liability at Current Single A Rate |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Effect of changes in cash flow assumptions |  | 1,485
Corporate and Other | No Effect Of Application Of Accounting Standards Update 2018-12 |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Net liability for future policy benefits, after reinsurance recoverable | $ (111) |
Protection Solutions PFBL | No Effect Of Application Of Accounting Standards Update 2018-12 |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Net liability for future policy benefits, after reinsurance recoverable | 550 |
PDR | No Effect Of Application Of Accounting Standards Update 2018-12 |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Net liability for future policy benefits, after reinsurance recoverable | (230) |
Rider Reserves and Term Reinsurance | No Effect Of Application Of Accounting Standards Update 2018-12 |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Net liability for future policy benefits, after reinsurance recoverable | $ (24) |
Term | Protection Solutions |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Less: Reinsurance Recoverable |  | (59)
Net liability for future policy benefits, after reinsurance recoverable |  | 1,924
Term | Protection Solutions | Adjustment for reversal of balances recorded in Accumulated Other Comprehensive Income |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Effect of changes in cash flow assumptions |  | 0
Term | Protection Solutions | Effect of Remeasurement of Liability at Current Single A Rate |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Effect of changes in cash flow assumptions |  | 560
Payout - Legacy | Individual Retirement |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Less: Reinsurance Recoverable |  | 0
Net liability for future policy benefits, after reinsurance recoverable |  | 3,407
Payout - Legacy | Individual Retirement | Adjustment for reversal of balances recorded in Accumulated Other Comprehensive Income |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Effect of changes in cash flow assumptions |  | (171)
Payout - Legacy | Individual Retirement | Effect of Remeasurement of Liability at Current Single A Rate |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Effect of changes in cash flow assumptions |  | 531
Group Pension | Corporate and Other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Less: Reinsurance Recoverable |  | 0
Net liability for future policy benefits, after reinsurance recoverable |  | 780
Group Pension | Corporate and Other | Adjustment for reversal of balances recorded in Accumulated Other Comprehensive Income |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Effect of changes in cash flow assumptions |  | (85)
Group Pension | Corporate and Other | Effect of Remeasurement of Liability at Current Single A Rate |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Effect of changes in cash flow assumptions |  | 94
Health | Corporate and Other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Less: Reinsurance Recoverable |  | (1,837)
Net liability for future policy benefits, after reinsurance recoverable |  | 463
Health | Corporate and Other | Adjustment for reversal of balances recorded in Accumulated Other Comprehensive Income |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Effect of changes in cash flow assumptions |  | (100)
Health | Corporate and Other | Effect of Remeasurement of Liability at Current Single A Rate |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Effect of changes in cash flow assumptions |  | $ 300

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- Definition Amount, after effect of reinsurance, of liability for future policy benefit. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(1) -URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 29E -URI https://asc.fasb.org/extlink&oid=126561865&loc=SL117819541-158441 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 6 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124506351&loc=d3e14931-158439 + Details
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