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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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Revenues	$ 15,947	$ 15,800	$ 17,068	$ 15,526	$ 16,070	$ 14,827	$ 14,943	$ 14,988	$ 64,341	$ 60,828	$ 62,346
Other (income) expense - net									101	(10)	(149)
Cost of products sold									60,160	57,310	58,728
Total gain (loss) recognized in earnings									(53)	637	(352)
Nonoperating Income (Expense) [Member]
Derivative [Line Items]
FX Contracts									(177)	214	(225)
Total gain (loss) recognized in earnings									(177)	214	0
Cost Of Products Sold [Member]
Derivative [Line Items]
FX Contracts									(139)	58	291
Commodity Contracts									258	375	(383)
Total gain (loss) recognized in earnings									119	433	(92)
Sales [Member]
Derivative [Line Items]
FX Contracts									5	(10)	(35)
Total gain (loss) recognized in earnings									$ 5	$ (10)	$ (35)