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The movements in the impairment of other financial assets are as follows: (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Financial Assets And Liabilities      
At the beginning  $ 6 $ 8
Impairment (1) 2 [1] 1 [1]
Reversal of unused amounts (7) (2)
Gain on monetary position, net (1)
Reclasification to assets clasified as held for sales (1)
At the end of the year $ 6
[1] It includes US$ 1 million and US$ 1 million corresponding to Discontinued operations for fiscal year 2020 and 2019, respectively.