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Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Lessee, Lease, Description [Line Items]      
Operating Lease, Expense $ 525 $ 497 $ 323
Operating cash flows used in the measurement of operating lease liabilities 490 420 411
Operating lease right-of-use assets obtained in exchange for operating lease obligations 535 299 $ 123
2022 421    
2023 359    
2024 295    
2025 248    
2026 198    
Thereafter 839    
Total undiscounted lease payments 2,360    
Less imputed interest (292)    
Operating Lease, Liability 2,068 1,998  
Operating Lease, Liability, Current 411 482  
Operating lease liabilities, non-current $ 1,657 $ 1,516  
Operating Lease, Weighted Average Remaining Lease Term 9 years 8 years  
Operating Lease, Weighted Average Discount Rate, Percent 2.80% 3.10%