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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 tax impact of US / Canada settlement (as a percent) |  | 0.30% | (1.30%) | 3.20% |
Settlement of claims with Canadian tax authority |  | $ 42 |  |  | $ 63
Interest and penalties through tax expense |  | $ 2 |  |  |
Tax impact of change in Mexican Pesos to US Dollars |  |  | $ 4 | $ 18 |
Tax impact of change in Mexican Pesos to US Dollars, percentage points |  |  | 0.50% | 2.40% |
Pre-tax gain on foreign currency exchange amounts |  |  | $ 0 | $ 0 |
2014-2016 |  |  |  |  |
Income taxes |  |  |  |  |
Net tax impact of US / Canada settlement |  |  |  | $ 7 |
Net tax impact of US / Canada settlement (as a percent) |  |  |  | 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 tax impact of US / Canada settlement (as a percent) | 3.20% |  |  |  |

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- Definition The portion of the difference between total income tax expense (benefit) as reported in the Income Statement and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable primarily to currency translation gains on monetary items under enacted tax laws during the period. + References No definition available. + Details
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