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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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