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Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]        
Net income (loss) $ 5 $ (22) $ (7) $ (383)
Other comprehensive income (loss):        
Foreign currency translation adjustments (4) 3 (1) (28)
Comprehensive income (loss) $ 1 $ (19) $ (8) $ (411)