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Capital Stock and Long-term Retention Plan - Reconciliation of shares (Details) - shares shares in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Reconciliation of the number of shares outstanding |  |
Outstanding at beginning of period (in shares) | 325,992.5 | 337,244.3
Repurchased | (879.5) | (616.0)
Cancelled and forfeited |  | (10,750.0)
Acquired | (2,011.4) | (402.2)
Released (in shares) | 6,194.3 | 516.4
Outstanding at end of period (in shares) | 329,295.9 | 325,992.5
Series "D" Shares |  |
Reconciliation of the number of shares outstanding |  |
Outstanding at beginning of period (in shares) | 81,022.4 | 84,083.8
Repurchased | (263.1) | (184.3)
Cancelled and forfeited |  | (2,911.3)
Acquired | (601.7) | (120.3)
Released (in shares) | 1,716.1 | 154.5
Outstanding at end of period (in shares) | 81,873.7 | 81,022.4
Series "L" Shares |  |
Reconciliation of the number of shares outstanding |  |
Outstanding at beginning of period (in shares) | 81,022.4 | 84,083.8
Repurchased | (263.1) | (184.3)
Cancelled and forfeited |  | (2,911.3)
Acquired | (601.7) | (120.3)
Released (in shares) | 1,716.1 | 154.5
Outstanding at end of period (in shares) | 81,873.7 | 81,022.4
Series "A" Shares |  |
Reconciliation of the number of shares outstanding |  |
Outstanding at beginning of period (in shares) | 113,019.2 | 116,223.9
Repurchased | (187.9) | (131.6)
Cancelled and forfeited |  | (3,097.4)
Acquired | (429.8) | (86.0)
Released (in shares) | 1,683.5 | 110.3
Outstanding at end of period (in shares) | 114,085.0 | 113,019.2
Series "B" Shares |  |
Reconciliation of the number of shares outstanding |  |
Outstanding at beginning of period (in shares) | 50,928.5 | 52,852.8
Repurchased | (165.4) | (115.8)
Cancelled and forfeited |  | (1,830.0)
Acquired | (378.2) | (75.6)
Released (in shares) | 1,078.6 | 97.1
Outstanding at end of period (in shares) | 51,463.5 | 50,928.5
CPOs |  |
Reconciliation of the number of shares outstanding |  |
Outstanding at beginning of period (in shares) | 2,314.9 | 2,402.4
Repurchased | (7.5) | (5.3)
Cancelled and forfeited |  | (83.2)
Acquired | (17.2) | (3.4)
Released (in shares) | 49.0 | 4.4
Outstanding at end of period (in shares) | 2,339.2 | 2,314.9

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- Definition The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_79_a_iv&doctype=Standard -URIDate 2021-03-24 + Details
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