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Equity - Share buyback program (Details) - USD ($)
$ in Millions
 1 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
IfrsStatementLineItems [Line Items]      
Number of shares repurchased [1]   178,815,500
Purchase of treasury shares $ 1,291 [1] $ 3,251 [1]
Share buyback program number of shares authorized to be repurchased [1]   141,158,533 249,259,298
Share buyback program number of value authorized to be repurchased [1]   $ 2,124 $ 4,384
Acquired Parent [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares repurchased [2]   73,179,052 32,416,000
Purchase of treasury shares [2]   $ 1,102 $ 527
Acquired By Wholly Owned Subsidiaries [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares repurchased [2]   67,979,481 38,027,798
Purchase of treasury shares [2]   $ 1,022 $ 606
Shares Buyback Program [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares repurchased [2]   141,158,533 70,443,798
Shares Buyback Program 1 [Member]      
IfrsStatementLineItems [Line Items]      
Purchase of treasury shares [2]   $ 2,124 $ 1,133
Acquired Parent 1 [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares repurchased [1]   81,855,600
Purchase of treasury shares [1]   $ 1,501
Acquired By Wholly Owned Subsidiaries 1 [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares repurchased [1]   96,959,900
Purchase of treasury shares [1]   $ 1,750
[1] On April 1, 2021, the Board of Directors approved the common shares buyback program, limited to a maximum of 270,000,000 common shares or their respective ADRs. Continuing the previous program, the Board of Directors approved a new shares buyback program on October 28, 2021, with a limit of up to 200,000,000 common shares or their respective ADRs. Both programs were concluded in 2022.
[2] On April 27, 2022, the Board of Directors approved the common shares buyback program, limited to a maximum of 500,000,000 common shares or their respective ADRs.