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

9 Months Ended

Sep. 30, 2017

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

Activity in medical costs payable

	Three Months Ended				Nine Months Ended
	September 30,		September 30,		September 30,		September 30,
(In millions)	2017		2016		2017		2016
Beginning balance	$	2,848	$	2,577	$	2,532	$	2,355
Less: Reinsurance and other amounts recoverable		259		208		275		243
Beginning balance, net		2,589		2,369		2,257		2,112
Incurred costs related to:
Current year		4,910		4,697		15,057		14,318
Prior years		(30)		(5)		(268)		(88)
Total incurred		4,880		4,692		14,789		14,230
Paid costs related to:
Current year		4,901		4,705		12,794		12,285
Prior years		46		82		1,730		1,783
Total paid		4,947		4,787		14,524		14,068
Ending balance, net		2,522		2,274		2,522		2,274
Add: Reinsurance and other amounts recoverable		261		276		261		276
Ending balance	$	2,783	$	2,550	$	2,783	$	2,550

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

	Three Months Ended
(Dollars in millions)	September 30, 2017			September 30, 2016
		$	%(1)			$	%(2)
Actual completion factors	$	20	0.1	%	$	2	-	%
Medical cost trend		10	0.1			3	-
Total favorable (unfavorable) variance	$	30	0.2	%	$	5	-	%
	Nine Months Ended
(Dollars in millions)	September 30, 2017			September 30, 2016
		$	%(1)			$	%(2)
Actual completion factors	$	128	0.7	%	$	65	0.3	%
Medical cost trend		131	0.7			31	0.2
Other (3)		9	-			(8)	-
Total favorable (unfavorable) variance	$	268	1.4	%	$	88	0.5	%
(1) Percentage of current year incurred costs as reported for the year ended December 31, 2016.
(2) Percentage of current year incurred costs as reported for the year ended December 31, 2015.
(3) Other amounts in 2017 primarily related to an increase in the 2016 reinsurance reimbursement rate from the Centers for Medicare and Medicaid Services ("CMS") under the Patient Protection and Affordable Care Act (the "Health Care Reform Act”). Other amounts in 2016 primarily related to increased medical costs in the Government segment resulting from sharing of additional risk adjustment revenue with providers.