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, 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]
Other (income) expense - net									$ 7	$ 101	$ (10)
Interest expense									402	364	330
Revenues	$ 16,329	$ 16,726	$ 16,297	$ 15,304	$ 15,947	$ 15,800	$ 17,068	$ 15,526	64,656	64,341	60,828
Cost of products sold									60,509	60,160	57,310
Sales [Member]
Derivative [Line Items]
Total amount recognized in earnings										36	(1)
Designated As Hedging Instrument [Member]
Derivative [Line Items]
Total amount recognized in earnings									(100)	(76)	(47)
Designated As Hedging Instrument [Member] | Nonoperating Income (Expense) [Member]
Derivative [Line Items]
FX Contracts effective amount recognized in earnings											(2)
Interest contracts effective amount recognized in earnings									(46)
Total amount recognized in earnings									(46)	0	(2)
Designated As Hedging Instrument [Member] | Interest Expense [Member]
Derivative [Line Items]
Interest contracts effective amount recognized in earnings									1	1	1
Total amount recognized in earnings									1	1	1
Designated As Hedging Instrument [Member] | Cost Of Products Sold [Member]
Derivative [Line Items]
Commodity Contracts effective amount recognized in earnings									(11)	(113)	(45)
Total amount recognized in earnings									(11)	(113)	(45)
Designated As Hedging Instrument [Member] | Sales [Member]
Derivative [Line Items]
Commodity Contracts effective amount recognized in earnings									(44)	$ 36	$ (1)
Total amount recognized in earnings									$ (44)