Derivative Instruments and Hedging Activities (Pre-Tax Gains (Losses) On Derivatives Designated As Hedging Instruments) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Derivative Instruments, Gains (Loss) [Line Items]
Revenues	$ 15,304	$ 15,526
Cost of Products Sold	14,376	14,637
Interest Expense	101	91
Other (Income) Expense - Net	(8)	(15)
Designated As Hedging Instrument [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Total amount recognized in earnings	(8)	8
Designated As Hedging Instrument [Member] | Other (Income) Expense - Net [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Commodity Contracts effective amount recognized in earnings	0	0
Total amount recognized in earnings	0	0
Designated As Hedging Instrument [Member] | Interest Expense [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Total amount recognized in earnings	0	0
Designated As Hedging Instrument [Member] | Cost of Products Sold [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Commodity Contracts effective amount recognized in earnings	5	6
Total amount recognized in earnings	5	6
Designated As Hedging Instrument [Member] | Revenues [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Commodity Contracts effective amount recognized in earnings	(13)	2
Total amount recognized in earnings	$ (13)	$ 2