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Goodwill & Other Intangible Assets - Other Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Amortized Intangible Assets:    
Gross Carrying Amount $ 708 $ 79
Accumulated Amortization (63) (49)
Net Carrying Amount 645 30
Total Indefinite Life Intangible Assets 14 14
Total Other Intangible Assets 722 93
Total Other Intangible Assets $ 659 44
Weighted Average    
Amortized Intangible Assets:    
Weighted Average Expected Life 15 years  
Value of in-force contracts    
Amortized Intangible Assets:    
Gross Carrying Amount $ 23 0
Accumulated Amortization (3) 0
Net Carrying Amount $ 20 0
Value of in-force contracts | Weighted Average    
Amortized Intangible Assets:    
Weighted Average Expected Life 1 year  
Customer relationships    
Amortized Intangible Assets:    
Gross Carrying Amount $ 590 0
Accumulated Amortization (6) 0
Net Carrying Amount $ 584 0
Customer relationships | Weighted Average    
Amortized Intangible Assets:    
Weighted Average Expected Life 15 years  
Marketing agreement with Aetna    
Amortized Intangible Assets:    
Gross Carrying Amount $ 16 0
Accumulated Amortization 0 0
Net Carrying Amount $ 16 0
Marketing agreement with Aetna | Weighted Average    
Amortized Intangible Assets:    
Weighted Average Expected Life 15 years  
Distribution Agreement    
Amortized Intangible Assets:    
Gross Carrying Amount $ 70 70
Accumulated Amortization (52) (48)
Net Carrying Amount $ 18 22
Distribution Agreement | Weighted Average    
Amortized Intangible Assets:    
Weighted Average Expected Life 15 years  
Agency relationships & Other    
Amortized Intangible Assets:    
Gross Carrying Amount $ 9 9
Accumulated Amortization (2) (1)
Net Carrying Amount $ 7 $ 8
Agency relationships & Other | Weighted Average    
Amortized Intangible Assets:    
Weighted Average Expected Life 9 years