Global Health Care Medical Costs Payable (Tables) - Global Health Benefits Segment [Member]

3 Months Ended

Mar. 31, 2018

Liability For Unpaid Claims And Claims Adjustment Expense [Line Items]

Activity in medical costs payable

	Three Months Ended
	March 31,		March 31,
(In millions)	2018		2017
Beginning balance	$	2,719	$	2,532
Less: Reinsurance and other amounts recoverable		265		275
Beginning balance, net		2,454		2,257
Incurred costs related to:
Current year		5,447		5,125
Prior years		(130)		(176)
Total incurred		5,317		4,949
Paid costs related to:
Current year		3,423		3,183
Prior years		1,665		1,509
Total paid		5,088		4,692
Ending balance, net		2,683		2,514
Add: Reinsurance and other amounts recoverable		242		256
Ending balance	$	2,925	$	2,770

Variances in incurred costs related to prior years' medical costs payable

	Three Months Ended
(Dollars in millions)	March 31, 2018			March 31, 2017
		$	%(1)			$	%(2)
Actual completion factors	$	71	0.4	%	$	78	0.4	%
Medical cost trend		50	0.2			98	0.5
Other		9	-			-	-
Total favorable (unfavorable) variance	$	130	0.6	%	$	176	0.9	%
(1) Percentage of current year incurred costs as reported for the year ended December 31, 2017.
(2) Percentage of current year incurred costs as reported for the year ended December 31, 2016.