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Financial Risk (Details 16) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of financial assets [line items] |  |
Liquid assets | $ 1,048 | $ 1,160
Securities at FVOCI |  |
Disclosure of financial assets [line items] |  |
Liquid assets | 202 |
Total (Member) |  |
Disclosure of financial assets [line items] |  |
Liquid assets | 846 |
United State of America |  |
Disclosure of financial assets [line items] |  |
Liquid assets | 740 | 1,132
United State of America | Securities at FVOCI |  |
Disclosure of financial assets [line items] |  |
Liquid assets | 90 |
United State of America | Total (Member) |  |
Disclosure of financial assets [line items] |  |
Liquid assets | 830 |
Other countries O.E.C.D |  |
Disclosure of financial assets [line items] |  |
Liquid assets | 100 | 4
Latin America |  |
Disclosure of financial assets [line items] |  |
Liquid assets | 6 | 4
Other Countries |  |
Disclosure of financial assets [line items] |  |
Liquid assets |  | $ 20
Multinational |  |
Disclosure of financial assets [line items] |  |
Liquid assets | 112 |
Multinational | Securities at FVOCI |  |
Disclosure of financial assets [line items] |  |
Liquid assets | $ 112 |

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