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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Derivative [Line Items]        
Total gain (loss) recognized in earnings $ 107 $ (587)    
Not Designated As Hedging Instrument [Member]        
Derivative [Line Items]        
Total gain (loss) recognized in earnings     $ 416 $ (491)
Revenues [Member]        
Derivative [Line Items]        
FX Contracts 3 (13) (8) (13)
Cost Of Products Sold [Member]        
Derivative [Line Items]        
FX Contracts (30) 155 30 262
Commodity Contracts 1 (625) 260 (635)
Other Income (Expense) [Member]        
Derivative [Line Items]        
FX Contracts $ 133 $ (104) $ 134 $ (105)