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Leases - Additional Information (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Finance Lease, Right-of-Use Asset $ 32 $ 29  
Finance Lease, Liability $ 25 21  
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Finance Lease, Right-of-Use Asset    
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability    
Operating lease right-of-use assets $ 495 559  
Operating lease liability $ 525 $ 595  
Maximum [Member]      
Operating lease liability     $ 66
Minimum [Member]      
Operating lease right-of-use assets     $ 74