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Insurance and Contractholder Liabilities - Integrated Medical - Prior Year Development (Details) - Integrated Medical [Member] - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Abstract]    
Variance (unfavorable) in incurred costs related to prior years' claims payable $ 159 $ 158
Variance (unfavorable) in incurred costs related to prior years' claims payable, percentage 0.70% 0.80%
Favorable (unfavorable) impact of prior year development on shareholders' net income $ 68 $ 70
Favorable (unfavorable) impact of prior year development on pre-tax income 86 89
Completion Factors [Member]    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Abstract]    
Variance (unfavorable) in incurred costs related to prior years' claims payable $ 87 $ 79
Variance (unfavorable) in incurred costs related to prior years' claims payable, percentage 0.40% 0.40%
Medical Cost Trend [Member]    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Abstract]    
Variance (unfavorable) in incurred costs related to prior years' claims payable $ 72 $ 70
Variance (unfavorable) in incurred costs related to prior years' claims payable, percentage 0.30% 0.40%
Other [Member]    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Abstract]    
Variance (unfavorable) in incurred costs related to prior years' claims payable $ 0 $ 9
Variance (unfavorable) in incurred costs related to prior years' claims payable, percentage 0.00% 0.00%