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Exceptional Items - Summary of Exceptional Items Related to the Samarco Dam Failure (Detail) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Jun. 30, 2022
Expenses excluding net finance costs:      
Expenses excluding net finance costs $ (15,429) $ (15,742) $ (32,371)
Profit from equity accounted investments, related impairments and expenses:      
Net finance costs (652) (352) (969)
Income tax benefit/(expense) (3,055) (4,959) (10,737)
Total (140) (1,244) (1,074)
Samarco dam failure [member]      
Expenses excluding net finance costs:      
Expenses excluding net finance costs (47) (27) (66)
Profit from equity accounted investments, related impairments and expenses:      
Samarco Germano dam decommissioning 31 49 68
Samarco dam failure provision (13) (539) (663)
Fair value change on forward exchange derivatives 109 (212) (81)
Net finance costs (222) (93) (290)
Income tax benefit/(expense) 2 1 (31)
Total $ (140) $ (821) $ (1,063)