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Leases (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Leases [Abstract]          
Operating Lease Expense $ 115 $ 110 $ 345 $ 326  
short term leases and variable leases costs 34 $ 34 104 101  
Operating Lease Payments     244 221  
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability     271 $ 253  
Operating Lease, Right-of-Use Asset $ 1,279   $ 1,279   $ 1,214
Included within other noncurrent assets OTHER NONCURRENT ASSETS   OTHER NONCURRENT ASSETS   OTHER NONCURRENT ASSETS
Operating lease liabilities $ 262   $ 262   $ 235
Current portion included within accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities, Current   Accounts Payable and Accrued Liabilities, Current   Accounts Payable and Accrued Liabilities, Current
Noncurrent portion of operating lease liability $ 1,159   $ 1,159   $ 1,110
Long-term portion included within other long-term liabilities OTHER LONG-TERM LIABILITIES   OTHER LONG-TERM LIABILITIES   OTHER LONG-TERM LIABILITIES
Total Operating Lease Liability $ 1,421   $ 1,421   $ 1,345
Weighted average remaining operating lease term (in years) 5 years 10 months 24 days   5 years 10 months 24 days   6 years 4 months 24 days
Weighted average discount rate - operating leases (percentage) 3.50%   3.50%   3.90%
Finance Lease Liabilities $ 63   $ 63   $ 63
Lessee, Operating Lease, Liability, Payment, Due [Abstract]          
Three months ended December 31, 2021 83   83    
2022 327   327    
2023 310   310    
2024 261   261    
2025 209   209    
Thereafter 443   443    
Undiscounted lease cash flow commitments 1,633   1,633    
Reconciling impact from discounting $ (212)   $ (212)