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Condensed Consolidated Statement 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 Comprehensive Income [Abstract]        
Net income attributable to controlling and noncontrolling interests $ 345 $ 448 $ 1,163 $ 796
Other comprehensive (loss)/income, net of tax:        
Defined benefit pension and other postretirement benefits 6 3 (1) 9
Unrealized foreign currency translation adjustments (215) 136 (276) (453)
Other comprehensive (loss)/income, net of tax (209) 139 (277) (444)
Total comprehensive income 136 587 886 352
Less: amounts attributable to noncontrolling interests:        
Net income (1) (6) (10) (9)
Unrealized foreign currency translation adjustments 2 (2) 5 6
Comprehensive income attributable to PPG $ 137 $ 579 $ 881 $ 349