Derivative Instruments and Hedging Activities (Pre-Tax Gains (Losses) On Derivatives 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]
Other (income) expense - net									$ 101	$ (10)	$ (149)
Interest expense									364	330	293
Revenues	$ 15,947	$ 15,800	$ 17,068	$ 15,526	$ 16,070	$ 14,827	$ 14,943	$ 14,988	64,341	60,828	62,346
Cost of products sold									60,160	57,310	58,728
Sales [Member]
Derivative [Line Items]
Commodity contracts ineffective amount recognized in earnings											(5)
Total amount recognized in earnings										(1)	(40)
Designated As Hedging Instrument [Member]
Derivative [Line Items]
Total amount recognized in earnings									(76)	(47)	(136)
Designated As Hedging Instrument [Member] | Nonoperating Income (Expense) [Member]
Derivative [Line Items]
FX Contracts effective amount recognized in earnings										(2)	(18)
Total amount recognized in earnings									0	(2)	(18)
Designated As Hedging Instrument [Member] | Interest Expense [Member]
Derivative [Line Items]
Interest contracts effective amount recognized in earnings									1	1	(2)
Total amount recognized in earnings									1	1	(2)
Designated As Hedging Instrument [Member] | Cost Of Products Sold [Member]
Derivative [Line Items]
Commodity Contracts effective amount recognized in earnings									(113)	(45)	(82)
Commodity contracts ineffective amount recognized in earnings											6
Total amount recognized in earnings									(113)	(45)	(76)
Designated As Hedging Instrument [Member] | Sales [Member]
Derivative [Line Items]
Commodity Contracts effective amount recognized in earnings									36	$ (1)	$ (35)
Total amount recognized in earnings									$ 36