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Debt and Borrowing Arrangements - Long-Term Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Finance leases $ 256 $ 123
Total 20,017 15,788
Less current portion of long-term debt (2,741) (1,581)
Long-term debt $ 17,276 14,207
U.S. dollar notes    
Debt Instrument [Line Items]    
Maturity date 2050  
Notes payable $ 11,917 9,442
U.S. dollar notes | Minimum    
Debt Instrument [Line Items]    
Effective interest rate 0.163%  
U.S. dollar notes | Maximum    
Debt Instrument [Line Items]    
Effective interest rate 7.00%  
U.S. dollar notes | Weighted Average    
Debt Instrument [Line Items]    
Effective interest rate 2.564%  
Euro notes    
Debt Instrument [Line Items]    
Maturity date 2035  
Notes payable $ 5,842 3,968
Euro notes | Minimum    
Debt Instrument [Line Items]    
Effective interest rate 0.00%  
Euro notes | Maximum    
Debt Instrument [Line Items]    
Effective interest rate 2.375%  
Euro notes | Weighted Average    
Debt Instrument [Line Items]    
Effective interest rate 1.352%  
Pound sterling notes    
Debt Instrument [Line Items]    
Maturity date 2045  
Notes payable $ 357 346
Pound sterling notes | Minimum    
Debt Instrument [Line Items]    
Effective interest rate 3.875%  
Pound sterling notes | Maximum    
Debt Instrument [Line Items]    
Effective interest rate 4.50%  
Pound sterling notes | Weighted Average    
Debt Instrument [Line Items]    
Effective interest rate 4.151%  
Swiss franc notes    
Debt Instrument [Line Items]    
Maturity date 2025  
Notes payable $ 1,175 1,449
Swiss franc notes | Minimum    
Debt Instrument [Line Items]    
Effective interest rate 0.615%  
Swiss franc notes | Maximum    
Debt Instrument [Line Items]    
Effective interest rate 1.125%  
Swiss franc notes | Weighted Average    
Debt Instrument [Line Items]    
Effective interest rate 0.84%  
Canadian dollar notes    
Debt Instrument [Line Items]    
Maturity date 2025  
Notes payable $ 470 $ 460
Canadian dollar notes | Minimum    
Debt Instrument [Line Items]    
Effective interest rate 3.25%  
Canadian dollar notes | Maximum    
Debt Instrument [Line Items]    
Effective interest rate 3.377%