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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative Instruments, Gains (Loss) [Line Items]
Revenues	$ 20,340	$ 15,126	$ 62,159	$ 46,377
Cost of Products Sold	19,014	14,084	57,822	43,276
Interest Expense	61	100	188	270
Other (Income) Expense - Net	20	282	36	202
Designated As Hedging Instrument [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Total amount recognized in earnings	122	66	435	(35)
Designated As Hedging Instrument [Member] | Revenues [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Interest contracts effective amount recognized in earnings		(14)	(15)	(55)
Commodity Contracts effective amount recognized in earnings	0	1	0	9
Total amount recognized in earnings	0	(13)	(15)	(46)
Designated As Hedging Instrument [Member] | Cost of Products Sold [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Commodity Contracts effective amount recognized in earnings	122	79	450	19
Total amount recognized in earnings	$ 122	$ 79	450	19
Designated As Hedging Instrument [Member] | Interest Expense [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Interest contracts effective amount recognized in earnings			0	(8)
Total amount recognized in earnings			$ 0	$ (8)