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Asset Impairments and Unusual Items - Components (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Asset Impairments and Unusual Items          
Gain from divestitures, net     $ (33)   $ (96)
Asset impairments $ 7 $ 61 68 $ 42 38
(Gain) loss from divestitures, asset impairments and unusual items     $ 35 $ 42 $ (58)