FAIR VALUE DISCLOSURES - Quantitative Information About Level 3 (Details) - Level 3 $ in Millions	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Corporate | Matrix Pricing Model
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	$ 237	$ 248
Corporate | Market Comparable Companies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	$ 917	$ 888
Corporate | Spread Over Benchmark | Matrix Pricing Model | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0020	0.0020
Corporate | Spread Over Benchmark | Matrix Pricing Model | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0797	0.0270
Corporate | Spread Over Benchmark | Matrix Pricing Model | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0171	0.0146
Corporate | EBITDA Multiple | Market Comparable Companies | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	5.7	4.9
Corporate | EBITDA Multiple | Market Comparable Companies | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	38.5	62.3
Corporate | EBITDA Multiple | Market Comparable Companies | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	14.1	13.0
Corporate | Discount Rate | Market Comparable Companies | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.055	0.00062
Corporate | Discount Rate | Market Comparable Companies | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.415	0.00215
Corporate | Discount Rate | Market Comparable Companies | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.083	0.00091
Corporate | Cash Flow Multiples | Market Comparable Companies | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.5	0.5
Corporate | Cash Flow Multiples | Market Comparable Companies | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	12.0	10.0
Corporate | Cash Flow Multiples | Market Comparable Companies | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	6.4	5.5
Corporate | Loan to Value | Market Comparable Companies | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.000	0.031
Corporate | Loan to Value | Market Comparable Companies | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.467	0.634
Corporate | Loan to Value | Market Comparable Companies | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.263	0.308
Other equity investments | Market Comparable Companies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	$ 4	$ 4
Other equity investments | Revenue Multiple | Market Comparable Companies | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.5	7.8
Other equity investments | Revenue Multiple | Market Comparable Companies | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	9.9	10.3
Other equity investments | Revenue Multiple | Market Comparable Companies | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	2.8	9.5
GMIB reinsurance contract asset | Discounted Cash Flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	$ 1,372	$ 2,068
GMIB reinsurance contract asset | Lapse Rate | Discounted Cash Flow | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0038	0.000045
GMIB reinsurance contract asset | Lapse Rate | Discounted Cash Flow | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.2266	0.2086
GMIB reinsurance contract asset | Lapse Rate | Discounted Cash Flow | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0292	0.00000265
GMIB reinsurance contract asset | Withdrawal Rate | Discounted Cash Flow | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0014	0.000027
GMIB reinsurance contract asset | Withdrawal Rate | Discounted Cash Flow | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.1002	0.0866
GMIB reinsurance contract asset | Withdrawal Rate | Discounted Cash Flow | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0102	0.00000093
GMIB reinsurance contract asset | Utilization Rate | Discounted Cash Flow | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0004	0.000004
GMIB reinsurance contract asset | Utilization Rate | Discounted Cash Flow | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.006054	0.6044
GMIB reinsurance contract asset | Utilization Rate | Discounted Cash Flow | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0561	0.00000527
GMIB reinsurance contract asset | Non-performance Risk | Discounted Cash Flow | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0101	0.0057
GMIB reinsurance contract asset | Non-performance Risk | Discounted Cash Flow | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0167	0.0093
GMIB reinsurance contract asset | Non-performance Risk | Discounted Cash Flow | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0103	0.0060
GMIB reinsurance contract asset | Volatility rates - Equity | Discounted Cash Flow | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.14	0.11
GMIB reinsurance contract asset | Volatility rates - Equity | Discounted Cash Flow | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.35	0.31
GMIB reinsurance contract asset | Volatility rates - Equity | Discounted Cash Flow | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.000025	0.24
GMIB reinsurance contract asset | Mortality Rates | Discounted Cash Flow | Minimum | Age 0-40
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0001	0.00000001
GMIB reinsurance contract asset | Mortality Rates | Discounted Cash Flow | Minimum | Age 41-60
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0006	0.00000006
GMIB reinsurance contract asset | Mortality Rates | Discounted Cash Flow | Minimum | Ages 61 - 115
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0032	0.00000031
GMIB reinsurance contract asset | Mortality Rates | Discounted Cash Flow | Maximum | Age 0-40
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0017	0.00000017
GMIB reinsurance contract asset | Mortality Rates | Discounted Cash Flow | Maximum | Age 41-60
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0052	0.00000053
GMIB reinsurance contract asset | Mortality Rates | Discounted Cash Flow | Maximum | Ages 61 - 115
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.4000	0.00004000
GMIB reinsurance contract asset | Mortality Rates | Discounted Cash Flow | Weighted Average | Age 0-40
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0309	0.00000279
GMIB reinsurance contract asset | Mortality Rates | Discounted Cash Flow | Weighted Average | Age 41-60
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input		0.00000279
GMIB reinsurance contract asset | Mortality Rates | Discounted Cash Flow | Weighted Average | Ages 61 - 115
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input		0.00000279
Amount Due from Reinsurers | Discounted Cash Flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	$ 4,312	$ 5,813
Amount Due from Reinsurers | Lapse Rate | Discounted Cash Flow | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0038	0.0045
Amount Due from Reinsurers | Lapse Rate | Discounted Cash Flow | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.2266	0.2086
Amount Due from Reinsurers | Lapse Rate | Discounted Cash Flow | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0193	0.0170
Amount Due from Reinsurers | Withdrawal Rate | Discounted Cash Flow | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0014	0.0027
Amount Due from Reinsurers | Withdrawal Rate | Discounted Cash Flow | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.1002	0.0866
Amount Due from Reinsurers | Withdrawal Rate | Discounted Cash Flow | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0138	0.0118
Amount Due from Reinsurers | Utilization Rate | Discounted Cash Flow | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0004	0.0004
Amount Due from Reinsurers | Utilization Rate | Discounted Cash Flow | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.6054	0.6044
Amount Due from Reinsurers | Utilization Rate | Discounted Cash Flow | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0827	0.0720
Amount Due from Reinsurers | Non-performance Risk | Discounted Cash Flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0063	0.0037
Amount Due from Reinsurers | Non-performance Risk | Discounted Cash Flow | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0063	0.0037
Amount Due from Reinsurers | Volatility rates - Equity | Discounted Cash Flow | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.14	0.11
Amount Due from Reinsurers | Volatility rates - Equity | Discounted Cash Flow | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.35	0.31
Amount Due from Reinsurers | Volatility rates - Equity | Discounted Cash Flow | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.25	0.24
Amount Due from Reinsurers | Mortality Rates | Discounted Cash Flow | Minimum | Age 0-40
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0001	0.00000001
Amount Due from Reinsurers | Mortality Rates | Discounted Cash Flow | Minimum | Age 41-60
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0006	0.00000006
Amount Due from Reinsurers | Mortality Rates | Discounted Cash Flow | Minimum | Ages 61 - 115
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0032	0.00000031
Amount Due from Reinsurers | Mortality Rates | Discounted Cash Flow | Maximum | Age 0-40
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0017	0.00000017
Amount Due from Reinsurers | Mortality Rates | Discounted Cash Flow | Maximum | Age 41-60
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0052	0.00000053
Amount Due from Reinsurers | Mortality Rates | Discounted Cash Flow | Maximum | Ages 61 - 115
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.4000	0.00004000
Amount Due from Reinsurers | Mortality Rates | Discounted Cash Flow | Weighted Average | Age 0-40
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0228	0.00000217
Amount Due from Reinsurers | Mortality Rates | Discounted Cash Flow | Weighted Average | Age 41-60
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input		0.00000217
Amount Due from Reinsurers | Mortality Rates | Discounted Cash Flow | Weighted Average | Ages 61 - 115
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input		0.00000217
GMIB NLG | Discounted Cash Flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 5,826	$ 8,503
GMIB NLG | Lapse Rate | Discounted Cash Flow | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0038	0.000104
GMIB NLG | Lapse Rate | Discounted Cash Flow | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.2879	0.002357
GMIB NLG | Lapse Rate | Discounted Cash Flow | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0423	0.00000355
GMIB NLG | Withdrawal Rate | Discounted Cash Flow | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0014	0.000027
GMIB NLG | Withdrawal Rate | Discounted Cash Flow | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.1002	0.0866
GMIB NLG | Withdrawal Rate | Discounted Cash Flow | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0127	0.00000104
GMIB NLG | Non-performance Risk | Discounted Cash Flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0186	0.0111
GMIB NLG | Non-performance Risk | Discounted Cash Flow | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0186	0.0111
GMIB NLG | Mortality Rates | Discounted Cash Flow | Minimum | Age 0-40
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0001	0.00000001
GMIB NLG | Mortality Rates | Discounted Cash Flow | Minimum | Age 41-60
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0007	0.00000007
GMIB NLG | Mortality Rates | Discounted Cash Flow | Minimum | Ages 61 - 115
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0044	0.00000044
GMIB NLG | Mortality Rates | Discounted Cash Flow | Maximum | Age 0-40
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0018	0.00000019
GMIB NLG | Mortality Rates | Discounted Cash Flow | Maximum | Age 41-60
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0056	0.00000057
GMIB NLG | Mortality Rates | Discounted Cash Flow | Maximum | Ages 61 - 115
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.4360	0.00004360
GMIB NLG | Mortality Rates | Discounted Cash Flow | Weighted Average | Age 0-40
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0171	0.00000162
GMIB NLG | Mortality Rates | Discounted Cash Flow | Weighted Average | Age 41-60
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input		0.00000162
GMIB NLG | Mortality Rates | Discounted Cash Flow | Weighted Average | Ages 61 - 115
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input		0.00000162
GMIB NLG | Annuitization Rate | Discounted Cash Flow | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0004	0.000003
GMIB NLG | Annuitization Rate | Discounted Cash Flow | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	1.0000	1.0000
GMIB NLG | Annuitization Rate | Discounted Cash Flow | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0610	0.00000524
GWBL/GMWB | Discounted Cash Flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 74	$ 99
GWBL/GMWB | Lapse Rate | Discounted Cash Flow | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0050	0.00000060
GWBL/GMWB | Lapse Rate | Discounted Cash Flow | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.2266	0.2086
GWBL/GMWB | Lapse Rate | Discounted Cash Flow | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0292	0.00000265
GWBL/GMWB | Withdrawal Rate | Discounted Cash Flow | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0000	0.000000
GWBL/GMWB | Withdrawal Rate | Discounted Cash Flow | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0800	0.0800
GWBL/GMWB | Withdrawal Rate | Discounted Cash Flow | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0102	0.00000093
GWBL/GMWB | Utilization Rate | Discounted Cash Flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	1	1
GWBL/GMWB | Non-performance Risk | Discounted Cash Flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0186	0.0111
GWBL/GMWB | Volatility rates - Equity | Discounted Cash Flow | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.14	0.11
GWBL/GMWB | Volatility rates - Equity | Discounted Cash Flow | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.35	0.31
GWBL/GMWB | Volatility rates - Equity | Discounted Cash Flow | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.25	0.24
GIB | Discounted Cash Flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ (64)	$ (75)
GIB | Lapse Rate | Discounted Cash Flow | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0050	0.000060
GIB | Lapse Rate | Discounted Cash Flow | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.2266	0.0000002086
GIB | Lapse Rate | Discounted Cash Flow | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0292	0.000265
GIB | Withdrawal Rate | Discounted Cash Flow | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0026	0.000013
GIB | Withdrawal Rate | Discounted Cash Flow | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0210	0.0866
GIB | Withdrawal Rate | Discounted Cash Flow | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0102	0.000093
GIB | Utilization Rate | Discounted Cash Flow | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0004	0.000004
GIB | Utilization Rate | Discounted Cash Flow | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	1.0000	1.0000
GIB | Utilization Rate | Discounted Cash Flow | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0561	0.000527
GIB | Non-performance Risk | Discounted Cash Flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0186
GIB | Volatility rates - Equity | Discounted Cash Flow | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.14	0.11
GIB | Volatility rates - Equity | Discounted Cash Flow | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.35	0.31
GIB | Volatility rates - Equity | Discounted Cash Flow | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.25	0.24
GMAB | Discounted Cash Flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ (1)	$ (3)
GMAB | Lapse Rate | Discounted Cash Flow | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0050	0.000060
GMAB | Lapse Rate | Discounted Cash Flow | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.2266	0.2086
GMAB | Lapse Rate | Discounted Cash Flow | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0292	0.000265
GMAB | Non-performance Risk | Discounted Cash Flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.0186	0.0111
GMAB | Volatility rates - Equity | Discounted Cash Flow | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.14	0.11
GMAB | Volatility rates - Equity | Discounted Cash Flow | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.35	0.31
GMAB | Volatility rates - Equity | Discounted Cash Flow | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Measurement input	0.25	0.24