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Post-employment benefits (Details 2) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Jan. 02, 2021
Jan. 02, 2020
IfrsStatementLineItems [Line Items]        
Amounts at the beginning of the period R$ (1,716) R$ (1,498)    
Amounts recognized in income (1+2+3+4) (440) (224)    
1 - Cost of current service (33) (53)    
2 - Cost of past service (155)      
3 - Net interest (177) (108)    
4 - Other expenses (75) (63)    
Amount recognized in stockholders' equity - other comprehensive income (28) 91    
5 - Effects on asset ceiling (211) 1,198    
6 - Remeasurements 150 (1,125)    
Changes in demographic assumptions 29 4    
Changes in financial assumptions 1,554 3,821    
Experience of the plan (1,412) (4,950)    
7 - Exchange variation 33 18    
Other (8+9+10) 275 (85)    
9 - Benefits paid 150 128    
10 - Contributions and investments from sponsor 124 110    
Amounts at end of the period (1,909) (1,716)    
Amount recognized in Assets (Note 18a) 411 493    
Amount recognized in Liabilities (Note 18b) R$ (2,320) (2,209)    
Receipt By Destination Of Resources   R$ (323)    
Discount rate 10.34% 9.46% 9.46% 7.64%
Defined Benefit Plans and Variable Contribution Plans [Member]        
IfrsStatementLineItems [Line Items]        
Amounts at the beginning of the period R$ (1,382) R$ (1,079)    
Amounts recognized in income (1+2+3+4) (158) (131)    
1 - Cost of current service (33) (53)    
3 - Net interest (125) (78)    
Amount recognized in stockholders' equity - other comprehensive income (22) (282)    
5 - Effects on asset ceiling (171) 665    
6 - Remeasurements 116 (965)    
Changes in demographic assumptions 29 4    
Changes in financial assumptions 1,499 3,708    
Experience of the plan (1,412) (4,677)    
7 - Exchange variation 33 18    
Other (8+9+10) 124 110    
9 - Benefits paid (1)      
10 - Contributions and investments from sponsor 124 110    
Amounts at end of the period (1,438) (1,382)    
Amount recognized in Assets (Note 18a) 33 48    
Amount recognized in Liabilities (Note 18b) (1,471) (1,430)    
Defined Benefit Plans and Variable Contribution Plans [Member] | Plan assets [member]        
IfrsStatementLineItems [Line Items]        
Amounts at the beginning of the period 21,912 23,225    
Amounts recognized in income (1+2+3+4) 1,995 1,722    
3 - Net interest 1,995 1,722    
Amount recognized in stockholders' equity - other comprehensive income (447) (1,764)    
6 - Remeasurements (441) (1,766)    
Experience of the plan (441) (1,766)    
7 - Exchange variation (6) 2    
Other (8+9+10)   (1,271)    
9 - Benefits paid (1,651) (1,381)    
10 - Contributions and investments from sponsor 124 110    
Amounts at end of the period 21,933 21,912    
Defined Benefit Plans and Variable Contribution Plans [Member] | Present value of defined benefit obligation [member]        
IfrsStatementLineItems [Line Items]        
Amounts at the beginning of the period (20,039) (20,662)    
Amounts recognized in income (1+2+3+4) (1,845) (1,575)    
1 - Cost of current service (33) (53)    
3 - Net interest (1,812) (1,522)    
Amount recognized in stockholders' equity - other comprehensive income 596 817    
6 - Remeasurements 557 801    
Changes in demographic assumptions 29 4    
Changes in financial assumptions 1,499 3,708    
Experience of the plan (971) (2,911)    
7 - Exchange variation 39 16    
Other (8+9+10) 1,651 1,381    
9 - Benefits paid 1,651 1,381    
Amounts at end of the period (19,637) (20,039)    
Defined Benefit Plans and Variable Contribution Plans [Member] | Effect of asset ceiling [member]        
IfrsStatementLineItems [Line Items]        
Amounts at the beginning of the period (3,255) (3,642)    
Amounts recognized in income (1+2+3+4) (308) (278)    
3 - Net interest (308) (278)    
Amount recognized in stockholders' equity - other comprehensive income (171) 665    
5 - Effects on asset ceiling (171) 665    
Amounts at end of the period (3,734) (3,255)    
Defined Contribution Plans [member]        
IfrsStatementLineItems [Line Items]        
Amounts at the beginning of the period 445 503    
Amounts recognized in income (1+2+3+4) (36) (27)    
3 - Net interest 39 36    
4 - Other expenses (75) (63)    
Amount recognized in stockholders' equity - other comprehensive income (31) 292    
5 - Effects on asset ceiling (40) 533    
6 - Remeasurements 9 (241)    
Changes in financial assumptions 9      
Experience of the plan   (241)    
Other (8+9+10)   (323)    
Amounts at end of the period 378 445    
Amount recognized in Assets (Note 18a) 378 445    
Receipt By Destination Of Resources   (323)    
Defined Contribution Plans [member] | Plan assets [member]        
IfrsStatementLineItems [Line Items]        
Amounts at the beginning of the period 447 1,454    
Amounts recognized in income (1+2+3+4) (36) 41    
3 - Net interest 39 104    
4 - Other expenses (75) (63)    
Amount recognized in stockholders' equity - other comprehensive income 9 (725)    
5 - Effects on asset ceiling   (484)    
6 - Remeasurements 9 (241)    
Changes in financial assumptions 9      
Experience of the plan   (241)    
Other (8+9+10)   (323)    
Amounts at end of the period 420 447    
Receipt By Destination Of Resources   (323)    
Defined Contribution Plans [member] | Effect of asset ceiling [member]        
IfrsStatementLineItems [Line Items]        
Amounts at the beginning of the period (2) (951)    
Amounts recognized in income (1+2+3+4)   (68)    
3 - Net interest   (68)    
Amount recognized in stockholders' equity - other comprehensive income (40) 1,017    
5 - Effects on asset ceiling (40) 1,017    
Amounts at end of the period (42) (2)    
Other post employment benefits [member]        
IfrsStatementLineItems [Line Items]        
Amounts at the beginning of the period (779) (922)    
Amounts recognized in income (1+2+3+4) (246) (66)    
2 - Cost of past service (155)      
3 - Net interest (91) (66)    
Amount recognized in stockholders' equity - other comprehensive income 25 81    
6 - Remeasurements 25 81    
Changes in financial assumptions 46 113    
Experience of the plan   (32)    
Other (8+9+10) 151 128    
9 - Benefits paid 151 128    
Amounts at end of the period (849) (779)    
Amount recognized in Liabilities (Note 18b) R$ (849) R$ (779)