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Debt and Borrowing Arrangements - Long-Term Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Notes payable $ 15,875  
Finance leases 123  
Finance leases and other obligations   $ 2
Total 15,788 15,180
Less current portion of long-term debt (1,581) (2,648)
Long-term debt 14,207 12,532
U.S. dollar notes    
Debt Instrument [Line Items]    
Notes payable $ 9,442 9,492
Maturity date 2048  
U.S. dollar notes | Minimum    
Debt Instrument [Line Items]    
Debt instrument, effective interest rate 0.163%  
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 3.107%  
Euro notes    
Debt Instrument [Line Items]    
Notes payable $ 3,968 3,492
Maturity date 2035  
Euro notes | Minimum    
Debt Instrument [Line Items]    
Debt instrument, effective interest rate 0.875%  
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 1.696%  
Pound sterling notes    
Debt Instrument [Line Items]    
Notes payable $ 346 333
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 $ 1,449 1,424
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 $ 460 $ 437
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%