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Financial Instruments - Narrative (Details)
 3 Months Ended
Mar. 31, 2019
USD ($)
interest_rate_swap
Dec. 31, 2018
USD ($)
Derivative [Line Items]    
Number of interest rate swaps held (in interest rate swaps) | interest_rate_swap 19  
Pretax net unrealized gain on derivatives maturing within next 12 months estimated to be reclassified from AOCI to sales $ 141,000,000  
Equity investments without readily determinable fair values 542,000,000  
Unrealized losses on investments 9,000,000  
Cumulative unrealized gains on investments 167,000,000  
Cumulative unrealized losses on investments 20,000,000  
Available-for-sale debt securities included in Short-term investments 691,000,000  
Available-for-sale debt securities maturing after one year through five years 5,200,000,000  
Cash and cash equivalents 8,076,000,000 $ 7,965,000,000
Fair value of loans payable and long-term debt, including current portion 27,100,000,000 25,600,000,000
Carrying value of loans payable and long-term debt, including current portion 25,900,000,000 25,100,000,000
Cash collateral received from counterparties 37,000,000 107,000,000
Cash collateral advanced to counterparties 0 $ 0
Significant Other Observable Inputs (Level 2)    
Derivative [Line Items]    
Cash and cash equivalents 8,100,000,000  
Cash equivalents $ 7,300,000,000  
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