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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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Revenues	$ 16,329	$ 16,726	$ 16,297	$ 15,304	$ 15,947	$ 15,800	$ 17,068	$ 15,526	$ 64,656	$ 64,341	$ 60,828
Other (income) expense - net									7	101	(10)
Cost of products sold									60,509	60,160	57,310
Total gain (loss) recognized in earnings									44	(53)	637
Nonoperating Income (Expense) [Member]
Derivative [Line Items]
FX Contracts									(21)	(177)	214
Total gain (loss) recognized in earnings									(21)	(177)	214
Cost Of Products Sold [Member]
Derivative [Line Items]
FX Contracts									32	(139)	58
Commodity Contracts									24	258	375
Total gain (loss) recognized in earnings									56	119	433
Sales [Member]
Derivative [Line Items]
FX Contracts									9	5	(10)
Total gain (loss) recognized in earnings									$ 9	$ 5	$ (10)