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Subsequent events (Details 7) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Brazil 1 [Member]      
IfrsStatementLineItems [Line Items]      
Future cash inflows $ 983,826 $ 612,924 $ 333,248
Future production costs (399,655) (264,158) (182,534)
Future development costs (62,548) (44,027) (31,236)
Future income tax expenses (178,412) (104,568) (46,862)
Undiscounted future net cash flows 343,211 200,171 72,616
10 percent midyear annual discount for timing of estimated cash flows (1) (151,828) (85,391) (26,638)
Standardized measure of discounted future net cash flows 191,383 114,780 45,978
South America 1 [Member]      
IfrsStatementLineItems [Line Items]      
Future cash inflows 837 587 69
Future production costs (357) (261) (51)
Future development costs (128) (107) (16)
Future income tax expenses (88) (61)  
Undiscounted future net cash flows 264 159 2
10 percent midyear annual discount for timing of estimated cash flows (1) (124) (70)  
Standardized measure of discounted future net cash flows 141 89 1
Total 1 [Member]      
IfrsStatementLineItems [Line Items]      
Future cash inflows 984,663 613,511 333,317
Future production costs (400,012) (264,419) (182,585)
Future development costs (62,676) (44,134) (31,252)
Future income tax expenses (178,500) (104,628) (46,862)
Undiscounted future net cash flows 343,475 200,330 72,618
10 percent midyear annual discount for timing of estimated cash flows (1) (151,951) (85,461) (26,638)
Standardized measure of discounted future net cash flows 191,524 114,869 45,979
Equity Method Investees 5 [Member]      
IfrsStatementLineItems [Line Items]      
Future cash inflows 1,581 1,129 667
Future production costs (273) (329) (465)
Future development costs (21) (28) (48)
Future income tax expenses     (79)
Undiscounted future net cash flows 1,287 772 75
10 percent midyear annual discount for timing of estimated cash flows (1) (401) (303) (1)
Standardized measure of discounted future net cash flows $ 886 $ 470 $ 74