Derivative Instruments and Hedging Activities (Pre-Tax Gains (Losses) On Derivatives Designated As Hedging Instruments) (Details) - Designated As Hedging Instrument [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Derivative Instruments, Gains (Loss) [Line Items]
Total amount recognized in earnings	$ 12	$ (124)	$ 65	$ (233)
Interest Expense [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Interest contracts effective amount recognized in earnings	0	1	0	1
Cost Of Products Sold [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Commodity Contracts effective amount recognized in earnings	2	(110)	(16)	(103)
Commodity contracts ineffective amount recognized in earnings	1	(12)	(3)	(19)
Revenues [Member]
Derivative Instruments, Gains (Loss) [Line Items]
Commodity Contracts effective amount recognized in earnings	4	(1)	49	(86)
Commodity contracts ineffective amount recognized in earnings	(1)	(4)	6	(28)
Other Income (Expense) - Net [Member]
Derivative Instruments, Gains (Loss) [Line Items]
FX Contracts effective amount recognized in earnings	$ 6	$ 2	28	2
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness			$ 1	$ 0