v3.22.0.1
Income Taxes​ - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at beginning of year $ 23 $ 21 $ 18
Additions for tax positions of prior years 1 0 4
Foreign currency translation (2)    
Foreign currency translation   2 1
Balance at end of year $ 22 $ 23 $ 21