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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]      
ROU assets $ 1,531 $ 775  
Operating lease liabilities - current 266 184  
Operating lease liabilities - noncurrent 1,203 626  
Operating lease costs 254 224 $ 208
Variable lease costs 66 49 41
Cash used in operating activities for payments of amounts included in the measurement of operating lease liabilities 288 222 208
Operating lease ROU assets obtained in exchange for new operating lease liabilities $ 293 $ 202 $ 205
Weighted Average Remaining Lease Term 9 years 10 months 24 days 6 years 3 months 18 days 6 years 2 months 12 days
Weighted Average Discount Rate 2.60% 3.40% 4.00%
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other assets Other assets  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Other accrued expenses Other accrued expenses  
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other long-term liabilities Other long-term liabilities  
2022  $ 303    
2023  248    
2024  193    
2025  144    
2026  120    
2027 and thereafter 650    
Total lease payments 1,658    
Imputed Interest 189    
Total operating lease liability 1,469    
Lease Residual Value Guarantee [Member]      
Lessee, Lease, Description [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted $ 147    
Minimum [Member]      
Lessee, Lease, Description [Line Items]      
Lessee, Operating Lease, Remaining Lease Term 1 month    
Lessee, Operating Lease, Renewal Term 1 year    
Maximum [Member]      
Lessee, Lease, Description [Line Items]      
Lessee, Operating Lease, Remaining Lease Term 30 years    
Lessee, Operating Lease, Renewal Term 10 years    
Lessee, Operating Lease, Option to Terminate, Term 1 year