XML 90 R72.htm IDEA: XBRL DOCUMENT v3.20.4
Leases - Additional Information (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Finance Lease, Right-of-Use Asset $ 29    
Finance Lease, Liability 21    
Operating lease right-of-use assets 559   $ 514
Operating lease liability $ 595   $ 553
Maximum [Member]      
Operating lease liability   $ 66  
Minimum [Member]      
Operating lease right-of-use assets   $ 74