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Income Taxes - Reconciliation of effective tax rate (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of effective tax rate          
Provision for tax at statutory rate (as a percent)     21.00% 21.00% 21.00%
Tax rate difference on foreign income (as a percent)     13.30% 9.10% 6.20%
Foreign currency FX (as a percent)     3.20% 1.20% (0.20%)
Inflation adjustments (as a percent)     (4.00%) (0.80%) (0.30%)
Tax benefit of intercompany financing (as a percent)     (1.60%) (0.80%) (1.20%)
U.S. international tax implications (as a percent)     0.80% 0.60% 2.20%
Valuation allowance in Argentina (as a percent)     (0.40%) (0.60%) 0.30%
Favorable judgement on the treatment of credits and interest on indirect taxes (as a percent)     (4.80%) (0.60%)  
Unremitted earnings (as a percent)     (12.10%)    
Impairment charge related to Accor joint venture (as a percent)     35.50%    
Other items - net (as a percent)     (1.30%) 0.90% (0.90%)
Provision at effective tax rate (as a percent)     49.60% 30.00% 27.10%
Tax impact, Favorable judgement on the treatment of credits and interest on indirect taxes (in dollars)     $ (12)    
Impairment on disposition of assets (in dollars) $ (20) $ 360 340    
Tax expense (benefit) on impairment (in dollars)     0    
Tax impact, Unremitted earnings (in dollars)     (30)    
Accrual for foreign withholding on unremitted earnings from foreign subsidiaries (in dollars)     1    
Tax provision on distributions of unremitted earnings (in dollars)     0    
Unremitted earnings of foreign subsidiaries considered permanently reinvested (in dollars)     $ 2,200    
Mexico          
Reconciliation of effective tax rate          
Provision for tax at statutory rate (as a percent)     30.00%    
Pakistan          
Reconciliation of effective tax rate          
Provision for tax at statutory rate (as a percent)     29.00%    
Colombia          
Reconciliation of effective tax rate          
Provision for tax at statutory rate (as a percent)     31.00%    
Brazil          
Reconciliation of effective tax rate          
Provision for tax at statutory rate (as a percent)     34.00%