v3.22.0.1
Leases​ (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Leases [Abstract]        
Lease cost $ 59 $ 62 $ 63  
Right-of-use asset obtained in exchange for operating lease liability 17 $ 46    
Operating Lease Obligation        
Year one 40      
Year two 30      
Year three 23      
Year four 17      
Year five 12      
Thereafter 28      
Total lease payments 150      
Less: imputed interest 25      
Present value of lease liabilities $ 125     $ 150
Weighted-average remaining lease term 6 years 1 month 6 days 6 years 7 months 6 days    
Weighted-average discount rate 5.80% 5.90%