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FAIR VALUE DISCLOSURES - Quantitative Information about Level 3 (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Investment gains (losses), net $ (86) $ (191) $ 1,983  
AFS fixed maturities transferred from Level 3 to Level 2 89 7    
AFS fixed maturities transferred from Level 3 to Level 2 28 5    
Asset Derivatives 4,725 6,046    
Level 3 | Public corporate        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair Value Unabsorvable Inputs 1,186 1,150 857 $ 430
Net investment income (loss) 8 4    
Investment gains (losses), net (9) 1 2  
Gain (loss) included in earnings (1) 5    
Other comprehensive income (loss) (21) 4 8  
Purchases 334 615 574  
Sales (337) (333) (144)  
AFS fixed maturities transferred from Level 3 to Level 2 89 7 25  
AFS fixed maturities transferred from Level 3 to Level 2 (28) (5) (38)  
Level 3 | Asset-backed        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair Value Unabsorvable Inputs 519 541 120 41
Net investment income (loss) 0 0    
Investment gains (losses), net 0 15 0  
Gain (loss) included in earnings 0 15    
Other comprehensive income (loss) (9) (7) 1  
Purchases 17 434 96  
Sales (30) (21) (9)  
AFS fixed maturities transferred from Level 3 to Level 2 0 0 0  
AFS fixed maturities transferred from Level 3 to Level 2 0 0 (9)  
Level 3 | Separate Accounts        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair Value Unabsorvable Inputs 374 349 313 313
Investment gains (losses), net 26 29 19  
Gain (loss) included in earnings 26 29 19  
Other comprehensive income (loss) 0 0 0  
Purchases 5 13 10  
Sales 1 2 0  
AFS fixed maturities transferred from Level 3 to Level 2 0 0 1  
AFS fixed maturities transferred from Level 3 to Level 2 0 0 23  
Level 3 | GMIB reinsurance contracts        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair Value Unabsorvable Inputs 1,732 1,894 1,735 1,829
Investment gains (losses), net 0 0 0  
Gain (loss) included in earnings (164) 174 (77)  
Other comprehensive income (loss) 0 0 0  
Purchases 46 48 48  
Sales 44 63 65  
AFS fixed maturities transferred from Level 3 to Level 2 0 0 0  
AFS fixed maturities transferred from Level 3 to Level 2 0 0 0  
Level 3 | States and political subdivisions        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair Value Unabsorvable Inputs 39 40 42 45
Net investment income (loss) 0 0    
Investment gains (losses), net 0 0 0  
Gain (loss) included in earnings 0 0    
Other comprehensive income (loss) (1) (1) (2)  
Purchases 0 0 0  
Sales (1) (1) (1)  
AFS fixed maturities transferred from Level 3 to Level 2 1 0 0  
AFS fixed maturities transferred from Level 3 to Level 2 0 0 0  
Level 3 | Foreign governments        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair Value Unabsorvable Inputs 0 0 0 1
Net investment income (loss) 0 0    
Investment gains (losses), net 0 0 0  
Gain (loss) included in earnings 0 0    
Other comprehensive income (loss) 0 0 0  
Purchases 0 0 0  
Sales 0 0 0  
AFS fixed maturities transferred from Level 3 to Level 2 0 0 0  
AFS fixed maturities transferred from Level 3 to Level 2 0 0 (1)  
Level 3 | Commercial mortgage-backed        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair Value Unabsorvable Inputs 0 0 373 $ 535
Net investment income (loss) 0 (2)    
Investment gains (losses), net 0 (95) (71)  
Gain (loss) included in earnings 0 (97)    
Other comprehensive income (loss) 0 78 14  
Purchases 0 0 0  
Sales 0 (354) (91)  
AFS fixed maturities transferred from Level 3 to Level 2 0 0 0  
AFS fixed maturities transferred from Level 3 to Level 2 0 0 $ (14)  
Other equity investments | Level 3 | Discounted Cash Flow Valuation Technique        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair Value Unabsorvable Inputs $ 35 $ 38    
Fair Value Inputs, Discount Period 12 years 12 years    
Other equity investments | Discount Rate | Level 3 | Discounted Cash Flow Valuation Technique        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Equity securities, measurement input 0.100 0.100    
Other equity investments | Revenue Multiple | Level 3 | Discounted Cash Flow Valuation Technique        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Equity securities, measurement input 9.4 10.8    
Other equity investments | Revenue Multiple | Level 3 | Discounted Cash Flow Valuation Technique | Weighted Average        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Equity securities, measurement input 9.4      
Public corporate | Level 3 | Matrix Pricing Model Valuation Technique        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair Value Unabsorvable Inputs $ 99 $ 53    
Public corporate | Level 3 | Matrix Pricing Model Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Spread Over Industry Yield Curve BPS 0.015 0    
Public corporate | Level 3 | Matrix Pricing Model Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Spread Over Industry Yield Curve BPS 0.0580 0.0565    
Public corporate | Level 3 | Matrix Pricing Model Valuation Technique | Weighted Average        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Spread Over Industry Yield Curve BPS 0.0109 0.0125    
Public corporate | Level 3 | Market Comparable Companies Valuation Technique        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair Value Unabsorvable Inputs $ 881 $ 789    
Public corporate | EBITDA Multiple | Level 3 | Market Comparable Companies Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Equity securities, measurement input 4.1 5.3    
Public corporate | EBITDA Multiple | Level 3 | Market Comparable Companies Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Equity securities, measurement input 37.8 27.9    
Public corporate | EBITDA Multiple | Level 3 | Market Comparable Companies Valuation Technique | Weighted Average        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Equity securities, measurement input 12.1 12.9    
Public corporate | Discount Rate | Level 3 | Market Comparable Companies Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Equity securities, measurement input 0.064 0.072    
Public corporate | Discount Rate | Level 3 | Market Comparable Companies Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Equity securities, measurement input 0.165 0.170    
Public corporate | Discount Rate | Level 3 | Market Comparable Companies Valuation Technique | Weighted Average        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Equity securities, measurement input 0.110 0.111    
Public corporate | Cash Flow Multiples | Level 3 | Market Comparable Companies Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Equity securities, measurement input 1.8 9.0    
Public corporate | Cash Flow Multiples | Level 3 | Market Comparable Companies Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Equity securities, measurement input 18.0 17.7    
Public corporate | Cash Flow Multiples | Level 3 | Market Comparable Companies Valuation Technique | Weighted Average        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Equity securities, measurement input 11.4 13.1    
Guaranteed Insurance Benefits | Level 3 | Discounted Cash Flow Valuation Technique        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Liability, fair value $ (48) $ (27)    
Guaranteed Insurance Benefits | Lapse Rate | Level 3 | Discounted Cash Flow Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.005 0.009    
Guaranteed Insurance Benefits | Lapse Rate | Level 3 | Discounted Cash Flow Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.057 0.057    
Guaranteed Insurance Benefits | Withdrawal Rate | Level 3 | Discounted Cash Flow Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.00 0.000    
Guaranteed Insurance Benefits | Withdrawal Rate | Level 3 | Discounted Cash Flow Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.080 0.070    
Guaranteed Insurance Benefits | Utilization Rate | Level 3 | Discounted Cash Flow Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.00 0.000    
Guaranteed Insurance Benefits | Utilization Rate | Level 3 | Discounted Cash Flow Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.160 0.160    
Guaranteed Insurance Benefits | Equity Volatility | Level 3 | Discounted Cash Flow Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.100 0.099    
Guaranteed Insurance Benefits | Equity Volatility | Level 3 | Discounted Cash Flow Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.340 0.309    
Assumed GMIB Reinsurance Contracts | Level 3 | Discounted Cash Flow Valuation Technique        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Liability, fair value $ 183 $ 194    
Assumed GMIB Reinsurance Contracts | Lapse Rate | Level 3 | Discounted Cash Flow Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.011 0.011    
Assumed GMIB Reinsurance Contracts | Lapse Rate | Level 3 | Discounted Cash Flow Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.112 0.133    
Assumed GMIB Reinsurance Contracts | Withdrawal Rate | Level 3 | Discounted Cash Flow Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.007 0.007    
Assumed GMIB Reinsurance Contracts | Withdrawal Rate | Level 3 | Discounted Cash Flow Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.222 0.222    
Assumed GMIB Reinsurance Contracts | Withdrawal Rate 2 | Level 3 | Discounted Cash Flow Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.013 0.013    
Assumed GMIB Reinsurance Contracts | Withdrawal Rate 2 | Level 3 | Discounted Cash Flow Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 1.000 1.000    
Assumed GMIB Reinsurance Contracts | Utilization Rate | Level 3 | Discounted Cash Flow Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.00 0.00    
Assumed GMIB Reinsurance Contracts | Utilization Rate | Level 3 | Discounted Cash Flow Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.300 0.300    
Assumed GMIB Reinsurance Contracts | Non Performance | Level 3 | Discounted Cash Flow Valuation Technique        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input   0.013    
Assumed GMIB Reinsurance Contracts | Non Performance | Level 3 | Discounted Cash Flow Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.011      
Assumed GMIB Reinsurance Contracts | Non Performance | Level 3 | Discounted Cash Flow Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.024      
Assumed GMIB Reinsurance Contracts | Equity Volatility | Level 3 | Discounted Cash Flow Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.100 0.099    
Assumed GMIB Reinsurance Contracts | Equity Volatility | Level 3 | Discounted Cash Flow Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.340 0.309    
GMIB and GWBL | Level 3 | Discounted Cash Flow Valuation Technique        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Liability, fair value $ 130 $ 130    
GMIB and GWBL | Lapse Rate | Level 3 | Discounted Cash Flow Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.005 0.009    
GMIB and GWBL | Lapse Rate | Level 3 | Discounted Cash Flow Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.057 0.057    
GMIB and GWBL | Withdrawal Rate | Level 3 | Discounted Cash Flow Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.000 0.000    
GMIB and GWBL | Withdrawal Rate | Level 3 | Discounted Cash Flow Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.070 0.070    
GMIB and GWBL | Utilization Rate | Level 3 | Discounted Cash Flow Valuation Technique        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 1.00 1.00    
GMIB and GWBL | Equity Volatility | Level 3 | Discounted Cash Flow Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.100 0.099    
GMIB and GWBL | Equity Volatility | Level 3 | Discounted Cash Flow Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.340 0.309    
Guaranteed Minimum Annuity Benefits | Level 3 | Discounted Cash Flow Valuation Technique        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Liability, fair value $ 7 $ 5    
Guaranteed Minimum Annuity Benefits | Lapse Rate | Level 3 | Discounted Cash Flow Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.005 0.005    
Guaranteed Minimum Annuity Benefits | Lapse Rate | Level 3 | Discounted Cash Flow Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.110 0.110    
Guaranteed Minimum Annuity Benefits | Equity Volatility | Level 3 | Discounted Cash Flow Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.100 0.099    
Guaranteed Minimum Annuity Benefits | Equity Volatility | Level 3 | Discounted Cash Flow Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.340 0.309    
GMIB reinsurance contracts | Level 3 | Discounted Cash Flow Valuation Technique        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Asset Derivatives $ 1,732 $ 1,894    
GMIB reinsurance contracts | Lapse Rate | Level 3 | Discounted Cash Flow Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing asset, measurement input 0.01 0.010    
GMIB reinsurance contracts | Lapse Rate | Level 3 | Discounted Cash Flow Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing asset, measurement input 0.0627 0.063    
GMIB reinsurance contracts | Withdrawal Rate | Level 3 | Discounted Cash Flow Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing asset, measurement input 0 0.000    
GMIB reinsurance contracts | Withdrawal Rate | Level 3 | Discounted Cash Flow Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing asset, measurement input 0.08 0.080    
GMIB reinsurance contracts | Utilization Rate | Level 3 | Discounted Cash Flow Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing asset, measurement input 0.000 0.000    
GMIB reinsurance contracts | Utilization Rate | Level 3 | Discounted Cash Flow Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing asset, measurement input 0.16 0.160    
GMIB reinsurance contracts | Non Performance | Level 3 | Discounted Cash Flow Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing asset, measurement input 0.0074 0.0005    
GMIB reinsurance contracts | Non Performance | Level 3 | Discounted Cash Flow Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing asset, measurement input 0.0159 0.0010    
GMIB reinsurance contracts | Equity Volatility | Level 3 | Discounted Cash Flow Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing asset, measurement input 0.10 0.099    
GMIB reinsurance contracts | Equity Volatility | Level 3 | Discounted Cash Flow Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing asset, measurement input 0.34 0.309    
Separate Accounts | Level 3 | Third Party Appraisal Valuation Technique        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair Value Unabsorvable Inputs $ 352 $ 326    
Separate Accounts | Level 3 | Discounted Cash Flow Valuation Technique        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Spread Over Industry Yield Curve BPS 0.0248 243.0000    
Fair Value Unabsorvable Inputs $ 1 $ 1    
Separate Accounts | Discount Rate | Level 3 | Third Party Appraisal Valuation Technique        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing asset, measurement input 0.065 0.066    
Separate Accounts | Discount Rate | Level 3 | Discounted Cash Flow Valuation Technique        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing asset, measurement input 0.051 0.04409    
Separate Accounts | Cap Rate | Level 3 | Third Party Appraisal Valuation Technique        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing asset, measurement input 0.044 0.046    
Separate Accounts | Exit Capitalization Rate | Level 3 | Third Party Appraisal Valuation Technique        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing asset, measurement input 0.056 0.056    
Guaranteed Minimum Insurance Benefits no Lapse Guarantee | Level 3 | Discounted Cash Flow Valuation Technique        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Liability, fair value $ 5,341 $ 4,149    
Guaranteed Minimum Insurance Benefits no Lapse Guarantee | Lapse Rate | Level 3 | Discounted Cash Flow Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.008 0.008    
Guaranteed Minimum Insurance Benefits no Lapse Guarantee | Lapse Rate | Level 3 | Discounted Cash Flow Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.262 0.262    
Guaranteed Minimum Insurance Benefits no Lapse Guarantee | Withdrawal Rate | Level 3 | Discounted Cash Flow Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.000 0.000    
Guaranteed Minimum Insurance Benefits no Lapse Guarantee | Withdrawal Rate | Level 3 | Discounted Cash Flow Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.121 0.124    
Guaranteed Minimum Insurance Benefits no Lapse Guarantee | Utilization Rate | Level 3 | Discounted Cash Flow Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.000 0.0000    
Guaranteed Minimum Insurance Benefits no Lapse Guarantee | Utilization Rate | Level 3 | Discounted Cash Flow Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 1.000 0.160    
Guaranteed Minimum Insurance Benefits no Lapse Guarantee | Non Performance | Level 3 | Discounted Cash Flow Valuation Technique        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.0189 0.010    
Guaranteed Minimum Insurance Benefits no Lapse Guarantee | Forfeiture Rate | Level 3 | Discounted Cash Flow Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input   0.0055    
Guaranteed Minimum Insurance Benefits no Lapse Guarantee | Forfeiture Rate | Level 3 | Discounted Cash Flow Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input   0.021    
Guaranteed Minimum Insurance Benefits no Lapse Guarantee | Equity Volatility | Level 3 | Discounted Cash Flow Valuation Technique        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input   0.200    
Ages 0 - 40 | GMIB reinsurance contracts | Mortality Rate | Level 3 | Discounted Cash Flow Valuation Technique | 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 Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing asset, measurement input 0.0018 0.0018    
Ages 0 - 40 | Guaranteed Minimum Insurance Benefits no Lapse Guarantee | Mortality Rate | Level 3 | Discounted Cash Flow Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.0001 0.0001    
Ages 0 - 40 | Guaranteed Minimum Insurance Benefits no Lapse Guarantee | Mortality Rate | Level 3 | Discounted Cash Flow Valuation Technique | 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 Valuation Technique | 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 Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing asset, measurement input 0.0054 0.0054    
Ages 41 - 60 | Guaranteed Minimum Insurance Benefits no Lapse Guarantee | Mortality Rate | Level 3 | Discounted Cash Flow Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.0006 0.0006    
Ages 41 - 60 | Guaranteed Minimum Insurance Benefits no Lapse Guarantee | Mortality Rate | Level 3 | Discounted Cash Flow Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.0053 0.0053    
Ages 60 - 115 | GMIB reinsurance contracts | Mortality Rate | Level 3 | Discounted Cash Flow Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing asset, measurement input 0.0042 0.0042    
Ages 60 - 115 | GMIB reinsurance contracts | Mortality Rate | Level 3 | Discounted Cash Flow Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing asset, measurement input 0.420 0.4200    
Ages 60 - 115 | Guaranteed Minimum Insurance Benefits no Lapse Guarantee | Mortality Rate | Level 3 | Discounted Cash Flow Valuation Technique | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.0041 0.0041    
Ages 60 - 115 | Guaranteed Minimum Insurance Benefits no Lapse Guarantee | Mortality Rate | Level 3 | Discounted Cash Flow Valuation Technique | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Servicing liability, measurement input 0.412 0.412