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Financial Instruments - Narrative (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2017
USD ($)
interest_rate_swap
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Derivative [Line Items]        
Pretax losses from euro-denominated notes included in cumulative translation adjustments $ 467 $ 60    
Number of interest rate swaps held (in interest rate swaps) | interest_rate_swap 26      
Pretax net unrealized loss on derivatives maturing within next 12 months estimated to be reclassified from AOCI to sales $ 164      
Available-for-sale debt securities included in Short-term investments 3,000      
Available-for-sale debt securities maturing after one year through five years 11,200      
Cash and cash equivalents 7,901 $ 7,907 $ 6,515 $ 8,524
Fair value of loans payable and long-term debt, including current portion 28,300   25,700  
Carrying value of loans payable and long-term debt, including current portion 27,000   24,800  
Accounts receivable outstanding for more than one year 190      
Cash collateral received from counterparties 8   $ 529  
Significant Other Observable Inputs (Level 2)        
Derivative [Line Items]        
Cash and cash equivalents 7,900      
Cash equivalents $ 7,100      
Derivatives Designated as Hedging Instruments | Maximum        
Derivative [Line Items]        
Maximum average period of maturities of contracts in years (less than) 2 years      
Derivatives Not Designated as Hedging Instruments | Maximum        
Derivative [Line Items]        
Maximum average period of maturities of contracts in years (less than) 1 year