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GENERAL INFORMATION - Narrative (Details) - USD ($) $ / shares in Units, $ in Billions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 06, 2010
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Disclosure of general information about financial statements [Abstract] |  |  |  |
Number of shares authorised (in shares) | 3,500,000,000 | 3,500,000,000 | 3,500,000,000 |
Par value per share (in dollars per share) | $ 1.00 | $ 1.00 | $ 1.00 |
Number of shares issued (in shares) | 2,004,743,442 | 2,004,743,442 | 2,004,743,442 |
Difference between historical carrying amounts of assets and value at which assets were contributed |  |  |  | $ 4.0
Tax reserve | $ 6.3 | $ 6.3 |  |

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