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Provisions for legal proceedings, judicial deposits and contingent liabilities (Details 5) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]    
Estimate $ 60,221 $ 49,171
Tax contingent liability [member]    
IfrsStatementLineItems [Line Items]    
Estimate 37,189 32,094
Tax contingent liability [member] | Plaintiff 1 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 11,409 10,386
Tax contingent liability [member] | Plaintiff 2 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 4,260 4,396
Tax contingent liability [member] | Plaintiff 3 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 2,872 2,414
Tax contingent liability [member] | Plaintiff 4 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 1,816 705
Tax contingent liability [member] | Plaintiff 5 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 1,418 498
Tax contingent liability [member] | Plaintiff 6 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 1,370 986
Tax contingent liability [member] | Plaintiff 7 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 1,263 870
Tax contingent liability [member] | Plaintiff 8 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 1,064 922
Tax contingent liability [member] | Plaintiff 9 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 723 646
Tax contingent liability [member] | Plaintiff 10 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 578 501
Tax contingent liability [member] | Plaintiff 11 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 544 485
Tax contingent liability [member] | Plaintiff 12 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 403 294
Tax contingent liability [member] | Plaintiff 13 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 273 240
Tax contingent liability [member] | Plaintiff 14 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 514 425
Tax contingent liability [member] | Plaintiff 15 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 960 842
Tax contingent liability [member] | Plaintiff 16 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 355 440
Tax contingent liability [member] | Plaintiff 17 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 1,257 916
Tax contingent liability [member] | Plaintiff 18 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 1,027 929
Tax contingent liability [member] | Plaintiff 19 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 374 687
Tax contingent liability [member] | Plaintiff 20 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 913 799
Tax contingent liability [member] | Plaintiff 21 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 299 263
Tax contingent liability [member] | Plaintiff 22 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 576 478
Tax contingent liability [member] | Plaintiff 23 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 81 486
Tax contingent liability [member] | Plaintiff 24 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 223 160
Tax contingent liability [member] | Plaintiff 25 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 311 347
Tax contingent liability [member] | Plaintiff 26 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 254 223
Other Tax Contingent Liability [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 2,052 1,756
Labor related contingent liability [member]    
IfrsStatementLineItems [Line Items]    
Estimate 10,150 8,272
Labor related contingent liability [member] | Plaintiff 1 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 8,362 6,806
Other Labor Related Contingent Liability [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 1,788 1,466
Civil related contingent liability [member]    
IfrsStatementLineItems [Line Items]    
Estimate $ 11,455 7,548
Civil related contingent liability [member] | Transactions Related To Civil Matters Contingent Liability One [Member] | Plaintiff Related To Civil Matters One [Member] | Current Status [Member]    
IfrsStatementLineItems [Line Items]    
Contingent liabilities, current status The claims involve lawsuits in different judicial stages.  
Civil related contingent liability [member] | Plaintiff 1 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate $ 3,547 2,988
Civil related contingent liability [member] | Plaintiff 2 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 2,245 1,531
Civil related contingent liability [member] | Plaintiff 3 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 2,225 6
Civil related contingent liability [member] | Plaintiff 4 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 2,214 1,980
Civil related contingent liability [member] | Plaintiff 5 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 240 156
Civil related contingent liability [member] | Plaintiff 6 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 984 887
Environmental Related Contingent Liability [Member]    
IfrsStatementLineItems [Line Items]    
Estimate 1,427 1,257
Environmental Related Contingent Liability [Member] | Plaintiff 1 [Member]    
IfrsStatementLineItems [Line Items]    
Estimate $ 1,427 $ 1,257