Derivative Instruments and Hedging Activities (Pre-Tax Gains (Losses) On Derivatives Not Designated As Hedging Instruments) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Revenues	$ 17,978	$ 15,126	$ 16,281	$ 14,970	$ 16,329	$ 16,726	$ 16,297	$ 15,304	$ 64,355	$ 64,656	$ 64,341
Cost of products sold									59,902	60,509	60,160
Total gain (loss) recognized in earnings									(706)	44	(53)
Other Nonoperating Income (Expense)									(278)	7	101
Interest expense									339	402	364
Interest Expense [Member]
Derivative [Line Items]
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net									(17)
Total gain (loss) recognized in earnings									(17)
Cost Of Products Sold [Member]
Derivative [Line Items]
FX Contracts									(496)	32	(139)
Commodity Contracts									(68)	24	258
Total gain (loss) recognized in earnings									(564)	56	119
Sales [Member]
Derivative [Line Items]
FX Contracts									28	9	5
Total gain (loss) recognized in earnings									28	9	5
Other Nonoperating Income (Expense)
Derivative [Line Items]
FX Contracts									(153)	(21)	(177)
Total gain (loss) recognized in earnings									$ (153)	$ (21)	$ (177)