Earnings Per Share - Summary of the Basic and Diluted (Loss) Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Numerator
Net (loss) earnings attributable to common shareholders	$ (139)	$ 73	$ (273)	$ 116
Less: dividend-equivalents declared for equity based awards	(1)	(1)	(2)	(1)
Net (loss) earnings available to common shareholders	$ (140)	$ 72	$ (275)	$ 115
Denominator
Weighted average number of shares outstanding - basic	178.5	177.7	178.4	177.7
Effect of dilutive securities		0.6		0.5
Weighted average number of shares outstanding - diluted	178.5	178.3	178.4	178.2
(Loss) earnings per share attributable to Pactiv Evergreen Inc. common shareholders
Basic	$ (0.78)	$ 0.41	$ (1.54)	$ 0.65
Diluted	$ (0.78)	$ 0.4	$ (1.54)	$ 0.65