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Leases (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
property
Sep. 30, 2020
property
Leases      
Operating lease right-of-use assets $ 176 $ 163  
Operating Lease, Liability   $ 199  
Minimum      
Leases      
Option to extend - Operating   6 months  
Option to extend - Finance   6 months  
Maximum      
Leases      
Remaining lease term - Operating   14 years  
Remaining lease term - Finance   14 years  
Option to extend - Operating   10 years  
Option to extend - Finance   10 years  
Properties in Palo Alto, California      
Leases      
Operating lease right-of-use assets $ 63    
Operating Lease, Liability   $ 63  
Number of properties | property   1 1
Properties in Palo Alto, California | Minimum      
Leases      
Lease term 2 years    
Properties in Palo Alto, California | Maximum      
Leases      
Lease term 10 years