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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, 2020 | Dec. 31, 2019
Reconciliation of the number of shares outstanding |  |
Outstanding at beginning of period (in shares) | 337,244.3 | 338,329.1
Under share repurchase program (in shares) | (616.0) | (4,557.2)
Cancelled and forfeited | (10,750.0) |
Acquired by trust under LTRP (in shares) | (402.2) | (307.1)
Released (in shares) | 516.4 | 3,779.5
Outstanding at end of period (in shares) | 325,992.5 | 337,244.3
Series "D" Shares |  |
Reconciliation of the number of shares outstanding |  |
Outstanding at beginning of period (in shares) | 84,083.8 | 84,502.9
Under share repurchase program (in shares) | (184.3) | (1,363.3)
Cancelled and forfeited | (2,911.3) |
Acquired by trust under LTRP (in shares) | (120.3) | (91.9)
Released (in shares) | 154.5 | 1,036.1
Outstanding at end of period (in shares) | 81,022.4 | 84,083.8
Series "L" Shares |  |
Reconciliation of the number of shares outstanding |  |
Outstanding at beginning of period (in shares) | 84,083.8 | 84,502.9
Under share repurchase program (in shares) | (184.3) | (1,363.3)
Cancelled and forfeited | (2,911.3) |
Acquired by trust under LTRP (in shares) | (120.3) | (91.9)
Released (in shares) | 154.5 | 1,036.1
Outstanding at end of period (in shares) | 81,022.4 | 84,083.8
Series "A" Shares |  |
Reconciliation of the number of shares outstanding |  |
Outstanding at beginning of period (in shares) | 116,223.9 | 116,207.2
Under share repurchase program (in shares) | (131.6) | (973.7)
Cancelled and forfeited | (3,097.4) |
Acquired by trust under LTRP (in shares) | (86.0) | (65.6)
Released (in shares) | 110.3 | 1,056.0
Outstanding at end of period (in shares) | 113,019.2 | 116,223.9
Series "B" Shares |  |
Reconciliation of the number of shares outstanding |  |
Outstanding at beginning of period (in shares) | 52,852.8 | 53,116.1
Under share repurchase program (in shares) | (115.8) | (856.9)
Cancelled and forfeited | (1,830.0) |
Acquired by trust under LTRP (in shares) | (75.6) | (57.7)
Released (in shares) | 97.1 | 651.3
Outstanding at end of period (in shares) | 50,928.5 | 52,852.8
CPOs |  |
Reconciliation of the number of shares outstanding |  |
Outstanding at beginning of period (in shares) | 2,402.4 | 2,414.4
Under share repurchase program (in shares) | (5.3) | (38.9)
Cancelled and forfeited | (83.2) |
Acquired by trust under LTRP (in shares) | (3.4) | (2.7)
Released (in shares) | 4.4 | 29.6
Outstanding at end of period (in shares) | 2,314.9 | 2,402.4

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