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Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Derivative [Line Items]        
Ineffectiveness related to cash flow hedges $ 0 $ 0 $ 0 $ 0
Maturity of foreign currency derivatives - cash flow hedges     May 31, 2024  
Unrealized loss on hedges of net investments (201) (6) $ (631) (544)
Ineffectiveness related to net investment hedges 0 0 0 0
Foreign Exchange Contract [Member]        
Derivative [Line Items]        
Notional amount 32,700   32,700  
Derivative instruments, gains to be reclassified to earnings 42   $ 42  
Foreign Exchange Contract [Member] | Maximum [Member]        
Derivative [Line Items]        
Maximum length of time hedged in a cash flow hedge     15 months  
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]        
Derivative [Line Items]        
Notional amount 14,900   $ 14,900  
Gain (loss) on derivatives not designated as hedging instruments 195 32 344 101
Net impact on earnings 0 0 0 0
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member]        
Derivative [Line Items]        
Notional amount 5,000   5,000  
Foreign Exchange Contract [Member] | Net Investment Hedging [Member]        
Derivative [Line Items]        
Notional amount 12,800   12,800  
Unrealized loss on hedges of net investments $ 478 $ 153 $ 1,504 $ 232