v3.20.4
Summary of Significant Accounting Policies - Schedule of Property and Equipment, Net (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property and Equipment      
Property and equipment, gross $ 10,859 $ 8,188  
Less accumulated depreciation (5,611) (5,226)  
Property and equipment, net 5,248 2,962  
Depreciation expense 666 464 $ 471
Land      
Property and Equipment      
Property and equipment, gross 288 72  
Buildings      
Property and Equipment      
Property and equipment, gross $ 2,555 1,613  
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 $ 6,976 6,012  
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 $ 1,040 $ 491