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Income Taxes - Details of Income before Income Taxes by Jurisdiction (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Canadian	$ 93	$ 583
Foreign	913	1,640
Income before income taxes, Total	$ 1,006	$ 2,223

X

- Definition

The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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- Definition

The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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