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Guaranteed Benefit Features - Separate Account Liabilities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Liabilities for Guarantees on Long-Duration Contracts [Line Items]        
Separate account liability $ 81,670.0 $ 69,931.0    
Variable Life and Universal Life        
Liabilities for Guarantees on Long-Duration Contracts [Line Items]        
Separate account liability 295.0 261.0    
Additional liability balance:        
Beginning balance 348.0 312.0 $ 467.0  
Incurred guaranteed benefits 209.0 193.0 (34.0)  
Paid guaranteed benefits (163.0) (157.0) (121.0)  
Adjustment for the close of The 2018 Transaction   0.0    
Ending balance 394.0 348.0 312.0  
Reinsurance on additional liability balance 1,005.0 899.0 906.0 $ 671.0
Stabilizer and MCGs        
Liabilities for Guarantees on Long-Duration Contracts [Line Items]        
Separate account liability 39,235.0 37,155.0    
Additional liability balance:        
Beginning balance 5.0 97.0 150.0  
Incurred guaranteed benefits 17.0 (92.0) (53.0)  
Paid guaranteed benefits 0.0 0.0 0.0  
Adjustment for the close of The 2018 Transaction   0.0    
Ending balance 22.0 5.0 97.0  
Stabilizer and MCGs | Separate Account Liability        
Additional liability balance:        
Externally managed assets included in Separate account liability not reported on balance sheet 31,900.0 29,000.0    
Other Retained Business        
Liabilities for Guarantees on Long-Duration Contracts [Line Items]        
Separate account liability 1,486.0 1,854.0    
Additional liability balance:        
Beginning balance 44.0 44.0 73.0  
Incurred guaranteed benefits (9.0) 2.0 (28.0)  
Paid guaranteed benefits 0.0 2.0 1.0  
Adjustment for the close of The 2018 Transaction   0.0    
Ending balance 35.0 44.0 44.0  
Held for sale | Variable Life and Universal Life        
Liabilities for Guarantees on Long-Duration Contracts [Line Items]        
Separate account liability 203.0 174.0    
Additional liability balance:        
Beginning balance 991.0 869.0 848.0  
Incurred guaranteed benefits 177.0 259.0 135.0  
Paid guaranteed benefits 155.0 137.0 114.0  
Adjustment for the close of The 2018 Transaction   0.0    
Ending balance 1,013.0 991.0 869.0  
Reinsurance on additional liability balance 569.0 552.0 603.0 $ 521.0
Held for sale | Other Retained Business        
Liabilities for Guarantees on Long-Duration Contracts [Line Items]        
Separate account liability 10.0 8.0    
Additional liability balance:        
Beginning balance 0.0 2,177.0 3,365.0  
Incurred guaranteed benefits 0.0 0.0 (998.0)  
Paid guaranteed benefits 0.0 0.0 190.0  
Adjustment for the close of The 2018 Transaction   2,177.0    
Ending balance $ 0.0 $ 0.0 $ 2,177.0