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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative Instruments, Gains (Loss) [Line Items]
Revenues	$ 22,926	$ 16,281	$ 41,819	$ 31,251
Cost of Products Sold	21,463	15,173	38,808	29,192
Interest Expense	40	87	127	170
Other (Income) Expense - Net	49	(56)	16	(80)
Designated As Hedging Instrument [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Total amount recognized in earnings	238	(57)	313	(101)
Designated As Hedging Instrument [Member] | Revenues [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Interest contracts effective amount recognized in earnings	(1)	(16)	(15)	(41)
Commodity Contracts effective amount recognized in earnings	0	3	0	8
Total amount recognized in earnings	(1)	(13)	(15)	(33)
Designated As Hedging Instrument [Member] | Cost of Products Sold [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Commodity Contracts effective amount recognized in earnings	239	(36)	328	(60)
Total amount recognized in earnings	239	(36)	328	(60)
Designated As Hedging Instrument [Member] | Interest Expense [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Interest contracts effective amount recognized in earnings	0	(8)	0	(8)
Total amount recognized in earnings	$ 0	$ (8)	$ 0	$ (8)