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

12 Months Ended

Dec. 31, 2015

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

Schedule of medical costs payable balance

(In millions)	2015		2014
Incurred but not yet reported	$	1,757	$	1,777
Reported costs in process		470		288
Physician incentives and other medical care expense and services payable		128		115
Medical costs payable	$	2,355	$	2,180

Schedule of medical costs payable activity

(In millions)	2015		2014		2013
Balance at January 1,	$	2,180	$	2,050	$	1,856
Less: Reinsurance and other amounts recoverable		252		194		242
Balance at January 1, net		1,928		1,856		1,614
Incurred costs related to:
Current year		18,564		16,853		16,049
Prior years		(210)		(159)		(182)
Total incurred		18,354		16,694		15,867
Paid costs related to:
Current year		16,588		14,966		14,267
Prior years		1,582		1,656		1,358
Total paid		18,170		16,622		15,625
Balance at December 31, net		2,112		1,928		1,856
Add: Reinsurance and other amounts recoverable		243		252		194
Balance at December 31,	$	2,355	$	2,180	$	2,050