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Financial Instruments - Narrative (Details)
 3 Months Ended
Mar. 31, 2018
USD ($)
interest_rate_swap
Dec. 31, 2017
USD ($)
Derivative [Line Items]    
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 $ 264,000,000  
Equity investments without readily determinable fair values 516,000,000  
Unrealized gains of equity investments 33,000,000  
Impairment losses on investments 8,000,000  
Available-for-sale debt securities included in Short-term investments 2,900,000,000  
Available-for-sale debt securities maturing after one year through five years 10,600,000,000  
Cash and cash equivalents 4,483,000,000 $ 6,092,000,000
Fair value of loans payable and long-term debt, including current portion 24,300,000,000 25,600,000,000
Carrying value of loans payable and long-term debt, including current portion 23,600,000,000 24,400,000,000
Accounts receivable outstanding for more than one year 80,000,000  
Cash collateral received from counterparties 0 3,000,000
Cash collateral advanced 0 $ 0
Significant Other Observable Inputs (Level 2)    
Derivative [Line Items]    
Cash and cash equivalents 4,500,000,000  
Cash equivalents $ 3,500,000,000  
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