Derivative Instruments and Hedging Activities (Pre-Tax Gains (Losses) On Derivatives Designated As Hedging Instruments) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments, Gains (Loss) [Line Items]
Revenues	$ 15,526	$ 14,988
Cost of Products Sold	14,637	14,116
Other (Income) Expense - Net	(15)	2
Designated As Hedging Instrument [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Total amount recognized in earnings	8	7
Designated As Hedging Instrument [Member] | Other (Income) Expense - Net [Member]
Derivative Instruments, Gains (Loss) [Line Items]
FX Contracts effective amount recognized in earnings		(2)
Total amount recognized in earnings	0	(2)
Designated As Hedging Instrument [Member] | Cost of Products Sold [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Commodity Contracts effective amount recognized in earnings	6	1
Commodity contracts ineffective amount recognized in earnings		5
Total amount recognized in earnings	6	6
Designated As Hedging Instrument [Member] | Revenues [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Commodity Contracts effective amount recognized in earnings	2	(1)
Commodity contracts ineffective amount recognized in earnings		4
Total amount recognized in earnings	$ 2	$ 3