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Goodwill & Other Intangible Assets - Other Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Amortized Intangible Assets:      
Finite-Lived Intangible Assets, Gross $ 775 $ 775 $ 708
Accumulated Amortization (132) (132) (63)
Net Carrying Amount 643 643 645
Total Indefinite Life Intangible Assets 14 14 14
Total Other Intangible Assets 789 789 722
Total Other Intangible Assets 657 $ 657 659
Weighted Average Expected Life      
Amortized Intangible Assets:      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   14 years  
Value of in-force contracts      
Amortized Intangible Assets:      
Finite-Lived Intangible Assets, Gross 23 $ 23 23
Accumulated Amortization (23) (23) (3)
Net Carrying Amount 0 $ 0 20
Value of in-force contracts | Weighted Average Expected Life      
Amortized Intangible Assets:      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   1 year  
Customer relationships [1]      
Amortized Intangible Assets:      
Finite-Lived Intangible Assets, Gross 636 $ 636 590
Accumulated Amortization (49) (49) (6)
Net Carrying Amount 587 $ 587 584
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   10 years  
Customer relationships [1] | Foremost [Domain]      
Amortized Intangible Assets:      
Finite-lived Intangible Assets Acquired   $ 46  
Customer relationships [1] | Weighted Average Expected Life      
Amortized Intangible Assets:      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   15 years  
Marketing agreement with Aetna      
Amortized Intangible Assets:      
Finite-Lived Intangible Assets, Gross 16 $ 16 16
Accumulated Amortization (1) (1) 0
Net Carrying Amount 15 $ 15 16
Marketing agreement with Aetna | Weighted Average Expected Life      
Amortized Intangible Assets:      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   15 years  
Distribution Agreement      
Amortized Intangible Assets:      
Finite-Lived Intangible Assets, Gross 79 $ 79 70
Accumulated Amortization (56) (56) (52)
Net Carrying Amount 23 $ 23 18
Distribution Agreement | Weighted Average Expected Life      
Amortized Intangible Assets:      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   15 years  
Agency relationships & Other [2]      
Amortized Intangible Assets:      
Finite-Lived Intangible Assets, Gross 21 $ 21 9
Accumulated Amortization (3) (3) (2)
Net Carrying Amount 18 $ 18 $ 7
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   15 years  
Agency relationships & Other [2] | Y-Risk [Domain]      
Amortized Intangible Assets:      
Finite-lived Intangible Assets Acquired $ 12    
Agency relationships & Other [2] | Weighted Average Expected Life      
Amortized Intangible Assets:      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   13 years