Derivative Instruments and Hedging Activities (Pre-Tax Gains (Losses) On Derivatives Designated As Hedging Instruments) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivative Instruments, Gains (Loss) [Line Items]
Revenues	$ 16,297	$ 17,068	$ 31,601	$ 32,594
Cost of Products Sold	15,325	15,887	29,701	30,524
Interest Expense	109	89	210	180
Other (Income) Expense - Net	(13)	(2)	(21)	(17)
Designated As Hedging Instrument [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Total amount recognized in earnings	0	(34)	(10)	(26)
Designated As Hedging Instrument [Member] | Other (Income) Expense - Net [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Interest contracts effective amount recognized in earnings	(6)		(8)
Commodity Contracts effective amount recognized in earnings	0	0		0
Total amount recognized in earnings	(6)	0	(8)	0
Designated As Hedging Instrument [Member] | Interest Expense [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Interest contracts effective amount recognized in earnings	0	1	0	1
Total amount recognized in earnings	0	1	0	1
Designated As Hedging Instrument [Member] | Cost of Products Sold [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Commodity Contracts effective amount recognized in earnings	1	(34)	6	(28)
Total amount recognized in earnings	1	(34)	6	(28)
Designated As Hedging Instrument [Member] | Revenues [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Commodity Contracts effective amount recognized in earnings	5	(1)	(8)	1
Total amount recognized in earnings	$ 5	$ (1)	$ (8)	$ 1