v3.22.0.1
Income Taxes - Deferred Tax Assets and Liabilities​ (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets        
Employee benefits $ 331 $ 503    
Tax loss carryforwards 206 167    
Deferred income 47 6    
Deferred Tax Asset, Interest Carryforward 44 15    
Operating lease right-of-use asset 30 37    
Loss provisions 24 42    
Depreciation 13 13    
Other 17 2    
Deferred tax assets, gross 712 785    
Valuation allowance (90) (91) $ (113) $ (107)
Deferred tax assets, net 622 694    
Deferred tax liabilities        
Deferred Tax Liabilities, Accounting Method Change 97      
Employee benefits 0 3    
Operating lease liabilities 30 37    
Depreciation 267 256    
Deferred expense 0 80    
Other 11 4    
Deferred tax liabilities $ 405 $ 380