XML 78 R54.htm IDEA: XBRL DOCUMENT v3.21.1
Leases - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Lessee, Lease, Description [Line Items]    
Sale-leaseback transaction, lease term   8 years
Sale leaseback transaction, net proceeds   $ 119
Operating lease, lease not yet commenced, amount $ 28  
Operating lease, impairment charges $ 21  
Minimum    
Lessee, Lease, Description [Line Items]    
Operating lease, lease not yet commenced, term of contract 3 years  
Maximum    
Lessee, Lease, Description [Line Items]    
Operating lease, lease not yet commenced, term of contract 10 years