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Financial Instruments - Narrative (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2017
USD ($)
interest_rate_swap
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Derivative [Line Items]        
Pretax gains (losses) from euro-denominated notes included in cumulative translation adjustments $ 135 $ 58    
Number of interest rate swaps held (in interest rate swaps) | interest_rate_swap 26      
Pretax net unrealized gains on derivatives maturing within next 12 months estimated to be reclassified from AOCI to sales $ 167      
Available-for-sale debt securities included in Short-term investments 3,500      
Available-for-sale debt securities maturing after one year through five years 10,600      
Cash and cash equivalents 11,708 $ 9,716 $ 6,515 $ 8,524
Cash equivalents 10,900      
Fair value of loans payable and long-term debt, including current portion 29,300   25,700  
Carrying value of loans payable and long-term debt, including current portion 28,500   24,800  
Accounts receivable outstanding for more than one year 135      
Cash collateral received from counterparties $ 222   $ 529  
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