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Income Taxes - U.S.-Canada treaty (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2017
Income taxes |  |  |  |  |
Net tax impact of US / Canada settlement | $ 24 |  | $ 10 |  |
Net impact of U.S.-Canada tax settlement |  | 0.30% | (1.30%) |  |
Settlement of claims with Canadian tax authority |  | $ 42 |  |  | $ 63
Interest and penalties through tax expense |  | $ 2 |  |  |
2014-2016 |  |  |  |  |
Income taxes |  |  |  |  |
Net tax impact of US / Canada settlement |  |  |  | $ 7 |
Net impact of U.S.-Canada tax settlement |  |  |  | 1.00% |
2016 |  |  |  |  |
Income taxes |  |  |  |  |
Net tax impact of US / Canada settlement income tax expense | 70 |  |  |  |
Net tax impact of US / Canada settlement income tax benefit | $ 46 |  |  |  |
Net impact of U.S.-Canada tax settlement | 3.20% |  |  |  |

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