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Accounting Policies - Unpaid Claims and Claims Expenses (Policies)	12 Months Ended
	Dec. 31, 2018
Integrated Medical [Member]
Liability For Unpaid Claims And Claims Adjustment Expense [Line Items]
Liabilities for unpaid claims and claims expenses	Accounting policy. The Company uses actuarial principles and assumptions that are consistently applied each reporting period and recognizes the actuarial best estimate of the ultimate liability along with a margin for adverse deviation. This approach is consistent with actuarial standards of practice that the liabilities be adequate under moderately adverse conditions.
Other Segments [Member]
Liability For Unpaid Claims And Claims Adjustment Expense [Line Items]
Liabilities for unpaid claims and claims expenses	Accounting policy. Liabilities for unpaid claims and claim expenses are established by book of business within the Company’s International Markets segment and Group Disability and Other. Liabilities for unpaid claims and claim expenses within the group disability and life business consist of the following primary products: long-term and short-term disability, life insurance, and accident coverages. Unpaid claims and claim expenses consist of (1) case or claims reserves for reported claims that are unpaid as of the balance sheet date; (2) incurred but not reported reserves for claims when the insured event has occurred but has not been reported to the Company; and (3) loss adjustment expense reserves for the expected costs of settling these claims. The Company consistently estimates incurred but not yet reported losses using actuarial principles and assumptions based on historical and projected claim incidence patterns, claim size and the expected payment period. The Company recognizes the actuarial best estimate of the ultimate liability within a level of confidence, consistent with actuarial standards of practice that the liabilities be adequate under moderately adverse conditions. The Company immediately records an adjustment in medical costs and other benefit expenses when estimates of these liabilities change.