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CAPITAL STOCK (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 15, 2022 | Dec. 15, 2021 | Sep. 15, 2021 | Jun. 15, 2021 | Jun. 30, 2022 | Jun. 30, 2022 | Jun. 30, 2021 | May 04, 2021
Capital Stock |  |  |  |  |  |  |  |  |
Return of capital |  |  |  |  |  |  |  | $ 250 |
Increase (decrease) through treasury share transactions, equity |  |  |  |  |  |  | $ (173) |  |
Capital stock |  |  |  |  |  |  |  |  |
Capital Stock |  |  |  |  |  |  |  |  |
Number of shares issued in dividend reinvestment plan with owners |  |  |  |  |  |  | 105,000 | 104,000 |
Return of capital |  |  |  |  |  |  |  | $ 250 |
Increase (decrease) through treasury share transactions, equity |  |  |  |  |  |  | $ (136) |  |
Other equity interest |  |  |  |  |  |  |  |  |
Capital Stock |  |  |  |  |  |  |  |  |
Approved return of capital distribution |  |  |  |  |  |  |  |  | $ 750
Return of capital |  |  |  |  |  |  |  | $ 0 |
Increase (decrease) through treasury share transactions, equity | [1] |  |  |  |  |  | $ (37) |  |
Other equity interest | Tranche 3 |  |  |  |  |  |  |  |  |
Capital Stock |  |  |  |  |  |  |  |  |
Return of capital |  |  | $ 250 |  |  |  |  |  |
Other equity interest | Tranche 2 |  |  |  |  |  |  |  |  |
Capital Stock |  |  |  |  |  |  |  |  |
Return of capital |  |  |  | $ 250 |  |  |  |  |
Other equity interest | Tranche 1 [Member] |  |  |  |  |  |  |  |  |
Capital Stock |  |  |  |  |  |  |  |  |
Return of capital |  |  |  |  | $ 250 |  |  |  |
Common shares | Capital stock |  |  |  |  |  |  |  |  |
Capital Stock |  |  |  |  |  |  |  |  |
Number of shares issued (shares) |  |  |  |  |  | 1,770,936,335 | 1,770,936,335 |  |
Par value per share (in dollars per share) |  |  |  |  |  | $ 0 | $ 0 |  |
Number of shares issued in dividend reinvestment plan with owners |  |  |  |  |  |  | 105,298 |  |
Number of shares repurchased |  |  |  |  |  | 8,500,000 |  |  |
Common shares | Capital stock | Not later than one year [member] |  |  |  |  |  |  |  |  |
Capital Stock |  |  |  |  |  |  |  |  |
Authorized cash outflow for repurchase of outstanding shares |  | $ 1,000 |  |  |  |  |  |  |
[1] | Includes additional paid-in capital as at June 30, 2022: $1,874 million (December 31, 2021: $1,911 million; June 30, 2021: $1,996 million).

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