Derivative Instruments and Hedging Activities (Pre-Tax Gains (Losses) On Derivatives Designated As Hedging Instruments) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivative Instruments, Gains (Loss) [Line Items]
Revenues	$ 17,068	$ 14,943	$ 32,594	$ 29,931
Cost of Products Sold	15,887	14,051	30,524	28,167
Interest Expense	89	86	180	167
Other (Income) Expense - Net	(2)	9	(17)	11
Designated As Hedging Instrument [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Total amount recognized in earnings	(34)	(1)	(26)	6
Designated As Hedging Instrument [Member] | Other (Income) Expense - Net [Member]
Derivative Instruments, Gains (Loss) [Line Items]
FX Contracts effective amount recognized in earnings		0		(2)
Commodity Contracts effective amount recognized in earnings	0			0
Total amount recognized in earnings	0	0	0	(2)
Designated As Hedging Instrument [Member] | Interest Expense [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Interest contracts effective amount recognized in earnings	1		1
Total amount recognized in earnings	1		1
Designated As Hedging Instrument [Member] | Cost of Products Sold [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Commodity Contracts effective amount recognized in earnings	(34)	(6)	(28)	(5)
Commodity contracts ineffective amount recognized in earnings		4		9
Total amount recognized in earnings	(34)	(2)	(28)	4
Designated As Hedging Instrument [Member] | Revenues [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Commodity Contracts effective amount recognized in earnings	(1)	1	1
Commodity contracts ineffective amount recognized in earnings		0		4
Total amount recognized in earnings	$ (1)	$ 1	$ 1	$ 4