Contingencies (Health Care Cost Recovery Litigation Narrative) (Details)	1 Months Ended	3 Months Ended
	Nov. 30, 1998 USD ($) state	Mar. 31, 2016 USD ($) case	Mar. 31, 2015 USD ($)	Apr. 20, 2015 case	Apr. 21, 2014 case
Health Care Cost Recovery Actions [Member]
Loss Contingencies [Line Items]
Number of cases pending | case				1	1
Number of states with settled litigation | state	46
State Settlement Agreements annual payments | $	$ 9,400,000,000
State Settlement Agreements attorney fees annual cap | $	$ 500,000,000
Litigation settlement, amount | $		$ 18,000,000
Cost of Sales [Member] | Health Care Cost Recovery Actions [Member]
Loss Contingencies [Line Items]
Litigation settlement, amount | $		(1,200,000,000)	$ (1,100,000,000)
Cost of Sales [Member] | Health Care Cost Recovery Actions, 2004-2014 NPM Adjustment [Member]
Loss Contingencies [Line Items]
Litigation settlement, amount | $		$ (12,000,000)
NEW YORK | Health Care Cost Recovery Actions, Medicare as Secondary Payer Case [Member]
Loss Contingencies [Line Items]
Number of claims dismissed | case		2
FLORIDA | Health Care Cost Recovery Actions, Medicare as Secondary Payer Case [Member]
Loss Contingencies [Line Items]
Number of claims dismissed | case		2
MASSACHUSETTS | Health Care Cost Recovery Actions, Medicare as Secondary Payer Case [Member]
Loss Contingencies [Line Items]
Number of claims dismissed | case		1
CANADA | Threatened Litigation [Member] | Health Care Cost Recovery Actions [Member]
Loss Contingencies [Line Items]
Number of cases pending | case		10