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Provisions, Contingent Assets and Contingent Liabilities - Summary of Changes in Civil, Labor and Other Risks Provisions (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disclosure of other provisions [line items] |  |
Opening balance | R$ 19,819 |
Closing balance | 19,592 | R$ 19,819
Legal proceedings provision [member] |  |
Disclosure of other provisions [line items] |  |
Opening balance | 3,511 | 3,634
(-) Provisions guaranteed by indemnity clause (Note 2.4.n) | (216) | (216)
Subtotal | 3,295 | 3,418
Adjustment / Interest (Note 23) | 221 | 191
Changes in the period reflected in income | 820 | 889
Increase | 1,176 | 1,179
Reversal | (356) | (290)
Payment | (1,244) | (1,203)
Subtotal | 3,092 | 3,295
(+) Provisions guaranteed by indemnity clause (Note 2.4.n) | 225 | 216
Closing balance | 3,317 | 3,511
Current | 1,266 | 1,254
Non-current | 2,051 | 2,257
Labor [Member] |  |
Disclosure of other provisions [line items] |  |
Opening balance | 8,015 | 8,579
(-) Provisions guaranteed by indemnity clause (Note 2.4.n) | (950) | (980)
Subtotal | 7,065 | 7,599
Adjustment / Interest (Note 23) | 155 | 482
Changes in the period reflected in income | 2,652 | 2,110
Increase | 2,888 | 2,296
Reversal | (236) | (186)
Payment | (2,532) | (3,126)
Subtotal | 7,340 | 7,065
(+) Provisions guaranteed by indemnity clause (Note 2.4.n) | 879 | 950
Closing balance | 8,219 | 8,015
Current | 2,528 | 3,125
Non-current | 5,691 | 4,890
Other [Member] |  |
Disclosure of other provisions [line items] |  |
Opening balance | 1,483 | 976
Subtotal | 1,483 | 976
Changes in the period reflected in income | 85 | 547
Increase | 119 | 550
Reversal | (34) | (3)
Payment | (10) | (40)
Subtotal | 1,558 | 1,483
Closing balance | 1,558 | 1,483
Current | 1,558 | 1,483
Civil labor and other provisions [member] |  |
Disclosure of other provisions [line items] |  |
Opening balance | 13,009 | 13,189
(-) Provisions guaranteed by indemnity clause (Note 2.4.n) | (1,166) | (1,196)
Subtotal | 11,843 | 11,993
Adjustment / Interest (Note 23) | 376 | 673
Changes in the period reflected in income | 3,557 | 3,546
Increase | 4,183 | 4,025
Reversal | (626) | (479)
Payment | (3,786) | (4,369)
Subtotal | 11,990 | 11,843
(+) Provisions guaranteed by indemnity clause (Note 2.4.n) | 1,104 | 1,166
Closing balance | 13,094 | 13,009
Current | 5,352 | 5,862
Non-current | R$ 7,742 | R$ 7,147

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