Derivative Instruments and Hedging Activities (Pre-Tax Gains (Losses) On Derivatives Designated As Hedging Instruments) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative Instruments, Gains (Loss) [Line Items]
Revenues	$ 15,126	$ 16,726	$ 46,377	$ 48,327
Cost of Products Sold	14,084	15,648	43,276	45,349
Interest Expense	100	97	270	307
Other (Income) Expense - Net	278	(18)	179	(39)
Designated As Hedging Instrument [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Total amount recognized in earnings	66	(17)	(35)	(27)
Designated As Hedging Instrument [Member] | Revenues [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Commodity Contracts effective amount recognized in earnings	1	3	9	(5)
Total amount recognized in earnings	1	3	9	(5)
Designated As Hedging Instrument [Member] | Cost of Products Sold [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Commodity Contracts effective amount recognized in earnings	79	1	19	7
Total amount recognized in earnings	79	1	19	7
Designated As Hedging Instrument [Member] | Interest Expense [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Interest contracts effective amount recognized in earnings	0	0	(8)	0
Total amount recognized in earnings	0	0	(8)	0
Designated As Hedging Instrument [Member] | Other (Income) Expense - Net [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Interest contracts effective amount recognized in earnings	(14)	(21)	(55)	(29)
Commodity Contracts effective amount recognized in earnings	0	0		0
Total amount recognized in earnings	$ (14)	$ (21)	$ (55)	$ (29)