Share Capital (Earnings Per Common Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Class Of Stock Disclosures [Abstract]
Net Earnings (Loss)		$ 1,357	$ (205)	$ 1,116	$ 104
Weighted average shares of common stock outstanding - Basic		257.2	261.1	257.3	260.6
Effect of dilutive securities	[1]	3.4	0.0	4.8	5.3
Weighted Average Shares of Common Stock Outstanding - Diluted		260.6	261.1	262.1	265.9
Net Earnings (Loss) per Share of Common Stock Basic		$ 5.28	$ (0.79)	$ 4.34	$ 0.40
Net Earnings (Loss) per Share of Common Stock Diluted	[1]	$ 5.21	$ (0.79)	$ 4.26	$ 0.39

[1] For the three months ended June 30, 2021, all of Ovintiv’s equity-settled awards were determined to be antidilutive and therefore are excluded from the calculation of fully diluted net earnings (loss) per share of common stock.