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SIGNIFICANT ACCOUNTING POLICIES - Schedule of Market Risk Benefit, Activity (Details) $ in Millions	Dec. 31, 2020 USD ($)
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk	$ 23,784
As Previously Reported
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk	19,525
Effect of Application of Accounting Standards Updated 2018-12, Adjustments for Reversal of Balances Recorded in Accumulated Other Comprehensive Income
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk	(74)
Effect of Application of Accounting Standards Update 2018-12, Cumulative Effect of Changes in Instrument-Specific Credit Risk
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk	968
Effect of Application of Accounting Standards Update 2018-12, Adjustments for Remaining Difference Between Carrying Amount and Fair Value for MRB
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk	3,365
Protection Solutions | No Effect of Application of Accounting Standards Update 2018-12
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk	(2)
GMxB Core | Individual Retirement
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk	2,144
GMxB Core | Individual Retirement | As Previously Reported
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk	2,206
GMxB Core | Individual Retirement | Effect of Application of Accounting Standards Updated 2018-12, Adjustments for Reversal of Balances Recorded in Accumulated Other Comprehensive Income
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk	(4)
GMxB Core | Individual Retirement | Effect of Application of Accounting Standards Update 2018-12, Cumulative Effect of Changes in Instrument-Specific Credit Risk
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk	505
GMxB Core | Individual Retirement | Effect of Application of Accounting Standards Update 2018-12, Adjustments for Remaining Difference Between Carrying Amount and Fair Value for MRB
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk	(563)
GMxB Legacy | Legacy Segment
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk	24,404
GMxB Legacy | Legacy Segment | As Previously Reported
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk	19,891
GMxB Legacy | Legacy Segment | Effect of Application of Accounting Standards Updated 2018-12, Adjustments for Reversal of Balances Recorded in Accumulated Other Comprehensive Income
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk	(70)
GMxB Legacy | Legacy Segment | Effect of Application of Accounting Standards Update 2018-12, Cumulative Effect of Changes in Instrument-Specific Credit Risk
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk	461
GMxB Legacy | Legacy Segment | Effect of Application of Accounting Standards Update 2018-12, Adjustments for Remaining Difference Between Carrying Amount and Fair Value for MRB
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk	4,122
Purchased MRB | Legacy Segment
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk	(2,764)
Purchased MRB | Legacy Segment | As Previously Reported
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk	(2,572)
Purchased MRB | Legacy Segment | Effect of Application of Accounting Standards Updated 2018-12, Adjustments for Reversal of Balances Recorded in Accumulated Other Comprehensive Income
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk	0
Purchased MRB | Legacy Segment | Effect of Application of Accounting Standards Update 2018-12, Cumulative Effect of Changes in Instrument-Specific Credit Risk
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk	2
Purchased MRB | Legacy Segment | Effect of Application of Accounting Standards Update 2018-12, Adjustments for Remaining Difference Between Carrying Amount and Fair Value for MRB
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk	(194)
EQUI-VEST Individual | No Effect of Application of Accounting Standards Update 2018-12
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk	43
SCS | No Effect of Application of Accounting Standards Update 2018-12
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk	21
Group Retirement EQUI-VEST | No Effect of Application of Accounting Standards Update 2018-12
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk	$ (20)

X

- Definition

Amount, before effect of reinsurance and after accumulated increase (decrease) in instrument-specific credit risk, of contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
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-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
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-Section 55
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
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