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FAIR VALUE DISCLOSURES - Quantitative Information about Level 3 (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Asset, fair value $ 8,603 $ 7,993
Corporate | Level 3 | Matrix pricing model    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value Unobservable Inputs $ 63 $ 57
Corporate | Level 3 | Matrix pricing model | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Spread over Benchmark 0.0015 0.0065
Corporate | Level 3 | Matrix pricing model | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Spread over Benchmark 0.0580 0.058
Corporate | Level 3 | Matrix pricing model | Weighted Average    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Spread over Benchmark 0.0264 0.0184
Corporate | Level 3 | Market comparable companies    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value Unobservable Inputs $ 1,034 $ 1,025
Corporate | EBITDA Multiple | Level 3 | Market comparable companies | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity securities, measurement input 3.2 3.3
Corporate | EBITDA Multiple | Level 3 | Market comparable companies | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity securities, measurement input 31.5 56.7
Corporate | EBITDA Multiple | Level 3 | Market comparable companies | Weighted Average    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity securities, measurement input 14.0 14.3
Corporate | Discount rate | Level 3 | Market comparable companies | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity securities, measurement input 0.060 0.039
Corporate | Discount rate | Level 3 | Market comparable companies | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity securities, measurement input 0.252 0.165
Corporate | Discount rate | Level 3 | Market comparable companies | Weighted Average    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity securities, measurement input 0.101 0.100
Corporate | Cash Flow Multiples | Level 3 | Market comparable companies | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity securities, measurement input 0.8 1.8
Corporate | Cash Flow Multiples | Level 3 | Market comparable companies | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity securities, measurement input 25.8 18.0
Corporate | Cash Flow Multiples | Level 3 | Market comparable companies | Weighted Average    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity securities, measurement input 11.1 10.7
Other equity investments | Level 3 | Discounted cash flow    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value Unobservable Inputs $ 37 $ 36
Fair value inputs, discount period 11 years 11 years
Other equity investments | Discount rate | Level 3 | Discounted cash flow    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity securities, measurement input 0.1  
Other equity investments | Earnings Multiple | Level 3 | Discounted cash flow    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity securities, measurement input 8.0 8.0
Other equity investments | Discount factor | Level 3 | Discounted cash flow    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity securities, measurement input   0.1
GMIB reinsurance contracts | Level 3 | Discounted cash flow    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Asset, fair value $ 2,823 $ 2,139
GMIB reinsurance contracts | Non-performance risk | Level 3 | Discounted cash flow | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing asset, measurement input 0.0144 0.0055
GMIB reinsurance contracts | Non-performance risk | Level 3 | Discounted cash flow | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing asset, measurement input 0.0293 0.0109
GMIB reinsurance contracts | Non-performance risk | Level 3 | Discounted cash flow | Weighted Average    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing asset, measurement input 0.0233  
GMIB reinsurance contracts | Lapse rates | Level 3 | Discounted cash flow | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing asset, measurement input 0.008 0.008
GMIB reinsurance contracts | Lapse rates | Level 3 | Discounted cash flow | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing asset, measurement input 0.10 0.10
GMIB reinsurance contracts | Lapse rates | Level 3 | Discounted cash flow | Weighted Average    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing asset, measurement input 0.0156  
GMIB reinsurance contracts | Withdrawal rates | Level 3 | Discounted cash flow | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing asset, measurement input 0 0
GMIB reinsurance contracts | Withdrawal rates | Level 3 | Discounted cash flow | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing asset, measurement input 0.08 0.08
GMIB reinsurance contracts | Withdrawal rates | Level 3 | Discounted cash flow | Weighted Average    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing asset, measurement input 0.0119  
GMIB reinsurance contracts | Utilization Rate | Level 3 | Discounted cash flow | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing asset, measurement input 0 0
GMIB reinsurance contracts | Utilization Rate | Level 3 | Discounted cash flow | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing asset, measurement input 0.49 0.49
GMIB reinsurance contracts | Utilization Rate | Level 3 | Discounted cash flow | Weighted Average    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing asset, measurement input 0.0659  
GMIB reinsurance contracts | Volatility rates - Equity | Level 3 | Discounted cash flow | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing asset, measurement input 0.20 0.09
GMIB reinsurance contracts | Volatility rates - Equity | Level 3 | Discounted cash flow | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing asset, measurement input 0.370 0.30
GMIB reinsurance contracts | Volatility rates - Equity | Level 3 | Discounted cash flow | Weighted Average    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing asset, measurement input 0.27  
GMIB reinsurance contracts | Mortality rate | Level 3 | Discounted cash flow | Weighted Average    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing asset, measurement input 0.0271  
GMIBNLG | Level 3 | Discounted cash flow    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Liability, fair value $ 9,308 $ 8,128
GMIBNLG | Non-performance risk | Level 3 | Discounted cash flow    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.0304 0.0124
GMIBNLG | Lapse rates | Level 3 | Discounted cash flow | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.008 0.008
GMIBNLG | Lapse rates | Level 3 | Discounted cash flow | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.199 0.199
GMIBNLG | Lapse rates | Level 3 | Discounted cash flow | Weighted Average    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.0275  
GMIBNLG | Withdrawal rates | Level 3 | Discounted cash flow | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.003 0.003
GMIBNLG | Withdrawal rates | Level 3 | Discounted cash flow | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.11 0.11
GMIBNLG | Withdrawal rates | Level 3 | Discounted cash flow | Weighted Average    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.0121  
GMIBNLG | Annuitization | Level 3 | Discounted cash flow | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0 0
GMIBNLG | Annuitization | Level 3 | Discounted cash flow | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 1 1
GMIBNLG | Annuitization | Level 3 | Discounted cash flow | Weighted Average    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.0646  
GMIBNLG | Mortality rate | Level 3 | Discounted cash flow | Weighted Average    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.0134  
Assumed GMIB Reinsurance Contracts | Level 3 | Discounted cash flow    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Liability, fair value $ 218 $ 186
Assumed GMIB Reinsurance Contracts | Non-performance risk | Level 3 | Discounted cash flow | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.0201 0.0061
Assumed GMIB Reinsurance Contracts | Non-performance risk | Level 3 | Discounted cash flow | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.0419 0.0141
Assumed GMIB Reinsurance Contracts | Non-performance risk | Level 3 | Discounted cash flow | Weighted Average    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.0375  
Assumed GMIB Reinsurance Contracts | Lapse rates | Level 3 | Discounted cash flow | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.011 0.011
Assumed GMIB Reinsurance Contracts | Lapse rates | Level 3 | Discounted cash flow | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.111 0.111
Assumed GMIB Reinsurance Contracts | Lapse rates | Level 3 | Discounted cash flow | Weighted Average    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.0156  
Assumed GMIB Reinsurance Contracts | Withdrawal rates | Level 3 | Discounted cash flow | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.006 0.006
Assumed GMIB Reinsurance Contracts | Withdrawal rates | Level 3 | Discounted cash flow | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.222 0.222
Assumed GMIB Reinsurance Contracts | Withdrawal rates | Level 3 | Discounted cash flow | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.011 0.011
Assumed GMIB Reinsurance Contracts | Withdrawal rates | Level 3 | Discounted cash flow | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 1 1
Assumed GMIB Reinsurance Contracts | Withdrawal rates | Level 3 | Discounted cash flow | Weighted Average    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.0119  
Assumed GMIB Reinsurance Contracts | Utilization Rate | Level 3 | Discounted cash flow | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0 0
Assumed GMIB Reinsurance Contracts | Utilization Rate | Level 3 | Discounted cash flow | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.3 0.3
Assumed GMIB Reinsurance Contracts | Utilization Rate | Level 3 | Discounted cash flow | Weighted Average    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.0659  
Assumed GMIB Reinsurance Contracts | Volatility rates - Equity | Level 3 | Discounted cash flow | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.20 0.09
Assumed GMIB Reinsurance Contracts | Volatility rates - Equity | Level 3 | Discounted cash flow | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.37 0.30
Assumed GMIB Reinsurance Contracts | Volatility rates - Equity | Level 3 | Discounted cash flow | Weighted Average    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.27  
GWBL/GMWB | Level 3 | Discounted cash flow    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Liability, fair value $ 146 $ 109
GWBL/GMWB | Non-performance risk | Level 3 | Discounted cash flow    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.0304 0.0124
GWBL/GMWB | Lapse rates | Level 3 | Discounted cash flow | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.008 0.008
GWBL/GMWB | Lapse rates | Level 3 | Discounted cash flow | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.10 0.010
GWBL/GMWB | Lapse rates | Level 3 | Discounted cash flow | Weighted Average    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.0175  
GWBL/GMWB | Withdrawal rates | Level 3 | Discounted cash flow | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0 0
GWBL/GMWB | Withdrawal rates | Level 3 | Discounted cash flow | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.07 0.070
GWBL/GMWB | Withdrawal rates | Level 3 | Discounted cash flow | Weighted Average    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.0119  
GWBL/GMWB | Utilization Rate | Level 3 | Discounted cash flow    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 1 1
GWBL/GMWB | Volatility rates - Equity | Level 3 | Discounted cash flow | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.20 0.09
GWBL/GMWB | Volatility rates - Equity | Level 3 | Discounted cash flow | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.37 0.30
GWBL/GMWB | Volatility rates - Equity | Level 3 | Discounted cash flow | Weighted Average    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.27  
GIB | Level 3 | Discounted cash flow    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Liability, fair value $ 38 $ 5
GIB | Non-performance risk | Level 3 | Discounted cash flow    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.000304 0.0124
GIB | Lapse rates | Level 3 | Discounted cash flow | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.012 0.012
GIB | Lapse rates | Level 3 | Discounted cash flow | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.199 0.199
GIB | Lapse rates | Level 3 | Discounted cash flow | Weighted Average    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.0175  
GIB | Withdrawal rates | Level 3 | Discounted cash flow | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0 0
GIB | Withdrawal rates | Level 3 | Discounted cash flow | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.08 0.080
GIB | Withdrawal rates | Level 3 | Discounted cash flow | Weighted Average    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.0119  
GIB | Utilization Rate | Level 3 | Discounted cash flow | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0 0
GIB | Utilization Rate | Level 3 | Discounted cash flow | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 1 1
GIB | Utilization Rate | Level 3 | Discounted cash flow | Weighted Average    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.0659  
GIB | Volatility rates - Equity | Level 3 | Discounted cash flow | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.20 0.09
GIB | Volatility rates - Equity | Level 3 | Discounted cash flow | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.370 0.30
GIB | Volatility rates - Equity | Level 3 | Discounted cash flow | Weighted Average    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.27  
GMAB | Level 3 | Discounted cash flow    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Liability, fair value $ 17 $ 4
GMAB | Non-performance risk | Level 3 | Discounted cash flow    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.000304  
GMAB | Lapse rates | Level 3 | Discounted cash flow | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.01 0.01
GMAB | Lapse rates | Level 3 | Discounted cash flow | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.10 0.10
GMAB | Lapse rates | Level 3 | Discounted cash flow | Weighted Average    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.0175  
GMAB | Volatility rates - Equity | Level 3 | Discounted cash flow | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.20 0.09
GMAB | Volatility rates - Equity | Level 3 | Discounted cash flow | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.37 0.30
GMAB | Volatility rates - Equity | Level 3 | Discounted cash flow | Weighted Average    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.27  
Ages 0 - 40 | GMIB reinsurance contracts | Mortality rate | Level 3 | Discounted cash flow | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing asset, measurement input 0.0001 0.0001
Ages 0 - 40 | GMIB reinsurance contracts | Mortality rate | Level 3 | Discounted cash flow | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing asset, measurement input 0.0018 0.0018
Ages 0 - 40 | GMIBNLG | Mortality rate | Level 3 | Discounted cash flow | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.0001 0.0001
Ages 0 - 40 | GMIBNLG | Mortality rate | Level 3 | Discounted cash flow | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.0019 0.0019
Ages 41 - 60 | GMIB reinsurance contracts | Mortality rate | Level 3 | Discounted cash flow | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing asset, measurement input 0.0007 0.0007
Ages 41 - 60 | GMIB reinsurance contracts | Mortality rate | Level 3 | Discounted cash flow | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing asset, measurement input 0.0054 0.0054
Ages 41 - 60 | GMIBNLG | Mortality rate | Level 3 | Discounted cash flow | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.0006 0.0006
Ages 41 - 60 | GMIBNLG | Mortality rate | Level 3 | Discounted cash flow | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.0053 0.0053
Ages 61 - 115 | GMIB reinsurance contracts | Mortality rate | Level 3 | Discounted cash flow | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing asset, measurement input 0.0042 0.0042
Ages 61 - 115 | GMIB reinsurance contracts | Mortality rate | Level 3 | Discounted cash flow | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing asset, measurement input 0.4220 0.4220
Ages 61 - 115 | GMIBNLG | Mortality rate | Level 3 | Discounted cash flow | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.0041 0.0041
Ages 61 - 115 | GMIBNLG | Mortality rate | Level 3 | Discounted cash flow | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing liability, measurement input 0.4139 0.4139