Financial Instruments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Four Quarter Rolling Average of Notional Amount of Foreign Exchange Contracts Hedging Foreign Currency Transactions	$ 16,800		$ 16,800		$ 15,600
Description of Net Investment Hedge Activity			we have issued approximately €2.95 billion of Euro-denominated debt, which qualifies as a net investment hedge against our investments in European businesses. As of June 30, 2016, the net investment hedge is deemed to be effective.
Derivatives designated as hedging instruments, Asset Derivatives	42		$ 42		4
Derivatives not designated as hedging instruments, Asset Derivatives	124		124		97
Derivatives designated as hedging instruments, Liability Derivatives	157		157		428
Derivatives not designated as hedging instruments, Liability Derivatives	65		65		$ 105
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax	36	$ 62	195	$ (122)
Loss reclassified from Accumulated other comprehensive loss (gain) into Product Sales (effective portion)	45	43	107	100
Foreign Currency Cash Flow Hedge Loss to be Reclassified During Next 12 Months	79		$ 79
Maximum Length of Time, Foreign Currency Cash Flow Hedge			6 years 4 months 26 days
Gain on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	$ 15	$ 12	$ 30	30
Proceeds from Derivative Instrument, Investing Activities			$ 86	$ 414