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Summary of Investments in Associates and Joint Ventures (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
DisclosureInvestmentsLineItems [Line Items]        
Balance at December 31, 2020     $ 1,510 $ 3,273
Investments     19 11
Transfer to assets held for sale     (58) (2,131)
Restructuring, capital decrease and others     (15) (175)
Results of equity-accounted investments $ (9) $ 1,026 341 1,209
CTA     (14) (52)
OCI     145 141
Dividends     (211) (218)
Balance at June 30, 2021 1,717 2,058 1,717 2,058
Joint ventures where entity is venturer [member]        
DisclosureInvestmentsLineItems [Line Items]        
Balance at December 31, 2020     509 813
Investments     14 5
Transfer to assets held for sale     1 (2)
Restructuring, capital decrease and others     (1)
Results of equity-accounted investments     157 109
CTA     2 20
OCI     1
Dividends     (105) (65)
Balance at June 30, 2021 578 880 578 880
Associates [member]        
DisclosureInvestmentsLineItems [Line Items]        
Balance at December 31, 2020 [1]     1,001 2,460
Investments [1]     5 6
Transfer to assets held for sale [1]     (59) (2,129)
Restructuring, capital decrease and others [1]     (14) (175)
Results of equity-accounted investments [1]     184 1,100
CTA [1]     (16) (72)
OCI [1]     144 141
Dividends [1]     (106) (153)
Balance at June 30, 2021 [1] $ 1,139 $ 1,178 $ 1,139 $ 1,178
[1] It includes Braskem and other investments.