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

9 Months Ended

Sep. 30, 2018

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

Activity in medical costs payable

	Nine Months Ended
	September 30,		September 30,
(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		16,287		14,952
Prior years		(189)		(268)
Total incurred		16,098		14,684
Paid costs related to:
Current year		13,915		12,689
Prior years		1,925		1,730
Total paid		15,840		14,419
Ending balance, net		2,712		2,522
Add: Reinsurance and other amounts recoverable		243		261
Ending balance	$	2,955	$	2,783

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

	Nine Months Ended
(Dollars in millions)	September 30, 2018			September 30, 2017
		$	%(1)			$	%(2)
Actual completion factors	$	114	0.6	%	$	128	0.7	%
Medical cost trend		66	0.3			131	0.7
Other		9	-			9	-
Total favorable (unfavorable) variance	$	189	0.9	%	$	268	1.4	%
(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.