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

6 Months Ended

Jun. 30, 2018

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

Activity in medical costs payable

	Six Months Ended
	June 30,		June 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		10,906		10,077
Prior years		(168)		(238)
Total incurred		10,738		9,839
Paid costs related to:
Current year		8,557		7,823
Prior years		1,873		1,684
Total paid		10,430		9,507
Ending balance, net		2,762		2,589
Add: Reinsurance and other amounts recoverable		243		259
Ending balance	$	3,005	$	2,848

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

	Six Months Ended
(Dollars in millions)	June 30, 2018			June 30, 2017
		$	%(1)			$	%(2)
Actual completion factors	$	93	0.5	%	$	108	0.6	%
Medical cost trend		66	0.3			121	0.6
Other		9	-			9	-
Total favorable (unfavorable) variance	$	168	0.8	%	$	238	1.2	%
(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.