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Leases (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]      
Operating Lease Expense $ 463 $ 439 $ 428
short term leases and variable leases costs 140 135 $ 130
Operating Lease Payments 327 300  
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 368 378  
Operating Lease, Right-of-Use Asset $ 1,306 $ 1,214  
Included within other noncurrent assets OTHER NONCURRENT ASSETS OTHER NONCURRENT ASSETS  
Operating lease liabilities $ 269 $ 235  
Current portion included within accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities, Current Accounts Payable and Accrued Liabilities, Current  
Noncurrent portion of operating lease liability $ 1,182 $ 1,110  
Long-term portion included within other long-term liabilities OTHER LONG-TERM LIABILITIES OTHER LONG-TERM LIABILITIES  
Operating Lease, Liability $ 1,451 $ 1,345  
Weighted average remaining operating lease term (in years) 5 years 10 months 24 days 6 years 4 months 24 days  
Weighted average discount rate - operating leases (percentage) 3.40% 3.90%  
Finance Lease Liabilities $ 64 $ 63  
Included in other long-term liabilities OTHER LONG-TERM LIABILITIES OTHER LONG-TERM LIABILITIES  
Lessee, Operating Lease, Liability, Payment, Due [Abstract]      
2022 $ 336    
2023 329    
2024 280    
2025 227    
2026 157    
Thereafter 349    
Undiscounted lease cash flow commitments 1,678    
Reconciling impact from discounting $ (227)