Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement Of Other Comprehensive Income [Abstract]
Net income (loss)	$ 43	$ (14)
Other comprehensive loss, net of income taxes:
Currency translation adjustments	4	(20)
Defined benefit plans	(103)
Other comprehensive loss	(99)	(20)
Comprehensive loss	(56)	(34)
Comprehensive income attributable to non-controlling interests		(1)
Comprehensive loss attributable to Pactiv Evergreen Inc. common shareholders	$ (56)	$ (35)