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Debt and Borrowing Arrangements - Long-Term Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Notes payable $ 15,250  
Capital leases and other obligations 2 $ 5
Total 15,180 14,135
Less current portion of long-term debt (2,648) (1,163)
Long-term debt 12,532 12,972
U.S. dollar notes    
Debt Instrument [Line Items]    
Notes payable $ 9,492 8,327
Maturity date 2040  
U.S. dollar notes | Minimum    
Debt Instrument [Line Items]    
Debt instrument, effective interest rate 1.625%  
U.S. dollar notes | Maximum    
Debt Instrument [Line Items]    
Debt instrument, effective interest rate 7.00%  
U.S. dollar notes | Weighted Average    
Debt Instrument [Line Items]    
Debt instrument, effective interest rate 3.412%  
Euro notes    
Debt Instrument [Line Items]    
Notes payable $ 3,492 3,653
Maturity date 2035  
Euro notes | Minimum    
Debt Instrument [Line Items]    
Debt instrument, effective interest rate 1.00%  
Euro notes | Maximum    
Debt Instrument [Line Items]    
Debt instrument, effective interest rate 2.375%  
Euro notes | Weighted Average    
Debt Instrument [Line Items]    
Debt instrument, effective interest rate 1.934%  
Pound sterling notes    
Debt Instrument [Line Items]    
Notes payable $ 333 456
Maturity date 2045  
Pound sterling notes | Minimum    
Debt Instrument [Line Items]    
Debt instrument, effective interest rate 3.875%  
Pound sterling notes | Maximum    
Debt Instrument [Line Items]    
Debt instrument, effective interest rate 4.50%  
Pound sterling notes | Weighted Average    
Debt Instrument [Line Items]    
Debt instrument, effective interest rate 4.151%  
Swiss franc notes    
Debt Instrument [Line Items]    
Notes payable $ 1,424 1,694
Maturity date 2025  
Swiss franc notes | Minimum    
Debt Instrument [Line Items]    
Debt instrument, effective interest rate 0.05%  
Swiss franc notes | Maximum    
Debt Instrument [Line Items]    
Debt instrument, effective interest rate 1.125%  
Swiss franc notes | Weighted Average    
Debt Instrument [Line Items]    
Debt instrument, effective interest rate 0.703%  
Canadian dollar notes    
Debt Instrument [Line Items]    
Notes payable $ 437 $ 0
Debt instrument, effective interest rate 3.25%  
Maturity date 2025  
Canadian dollar notes | Weighted Average    
Debt Instrument [Line Items]    
Debt instrument, effective interest rate 3.32%