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Summary of Significant Accounting Policies - Schedule of Property and Equipment, Net (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Property and Equipment      
Property and equipment, gross $ 10,727 $ 10,859  
Less accumulated depreciation (5,617) (5,611)  
Property and equipment, net 5,110 5,248  
Depreciation expense 803 666 $ 464
Land      
Property and Equipment      
Property and equipment, gross 287 288  
Buildings      
Property and Equipment      
Property and equipment, gross $ 2,791 2,555  
Buildings | Minimum      
Property and Equipment      
Estimated useful lives 10 years    
Buildings | Maximum      
Property and Equipment      
Estimated useful lives 50 years    
Equipment      
Property and Equipment      
Property and equipment, gross $ 6,850 6,976  
Equipment | Minimum      
Property and Equipment      
Estimated useful lives 2 years    
Amortization period of software costs included in equipment 3 years    
Equipment | Maximum      
Property and Equipment      
Estimated useful lives 25 years    
Amortization period of software costs included in equipment 10 years    
Construction in progress      
Property and Equipment      
Property and equipment, gross $ 799 $ 1,040