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

12 Months Ended

Dec. 31, 2016

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

Components of Global Health Care medical costs payable

(In millions)	2016		2015
Incurred but not reported	$	1,858	$	1,757
Reported claims in process		556		470
Physician incentives and other medical care expense and services payable		118		128
Medical costs payable	$	2,532	$	2,355

Activity in medical costs payable

(In millions)	2016		2015		2014
Balance at January 1,	$	2,355	$	2,180	$	2,050
Less: Reinsurance and other amounts recoverable		243		252		194
Balance at January 1, net		2,112		1,928		1,856
Incurred costs related to:
Current year		19,087		18,564		16,853
Prior years		(78)		(210)		(159)
Total incurred		19,009		18,354		16,694
Paid costs related to:
Current year		17,052		16,588		14,966
Prior years		1,812		1,582		1,656
Total paid		18,864		18,170		16,622
Balance at December 31, net		2,257		2,112		1,928
Add: Reinsurance and other amounts recoverable		275		243		252
Balance at December 31,	$	2,532	$	2,355	$	2,180

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

($ in millions)	2016			2015
		$	%(1)		$	%(2)
Actual completion factors	$	59	0.3%	$	62	0.4%
Medical cost trend		27	0.1%		115	0.7%
Other (3)		(8)	0.0%		33	0.2%
Total favorable (unfavorable) variance	$	78	0.4%	$	210	1.3%
(1) Percentage of current year incurred costs as reported for 2015.
(2) Percentage of current year incurred costs as reported for 2014.
(3) In 2015, the other balance primarily relates to an increase in the 2014 reinsurance reimbursement rate from CMS under the Health Care Reform Act.

Incurred and paid claims development

($ in millions, except for claims frequency)
	Incurred Costs
Incurral Year	2015 (Unaudited)		2016		Medical Costs Payable		Claims Frequency
2015	$	18,564	$	18,487	$	182		2.5 million
2016				19,087	$	2,035		2.9 million
Cumulative incurred costs for the periods presented			$	37,574
	Cumulative Paid Costs
Incurral Year	2015 (Unaudited)		2016
2015	$	16,588	$	18,305
2016				17,052
Cumulative paid costs for the periods presented			$	35,357
Outstanding liabilities prior to 2015				40
Net outstanding liabilities for Global Health Care medical costs payable				2,257
Reinsurance and other amounts recoverable				275
Total liability for Global Health Care medical costs payable			$	2,532