Accumulated Other Comprehensive Loss Attributable to Crown Holdings (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025	Dec. 31, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	$ 3,412	$ 3,172	$ 3,480	$ 3,228
Total other comprehensive income / (loss)	(17)	(35)
Balance at end of period	3,412	3,172
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(1,399)	(1,497)	(1,382)	(1,462)
Other comprehensive income / (loss) before reclassifications	(18)	(37)
Amounts reclassified from accumulated other comprehensive income	1	2
Total other comprehensive income / (loss)	(17)	(35)
Balance at end of period	(1,399)	(1,497)
Defined benefit plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(226)	(228)	(228)	(230)
Other comprehensive income / (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income	2	2
Total other comprehensive income / (loss)	2	2
Balance at end of period	(226)	(228)
Foreign currency translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(1,200)	(1,271)	(1,169)	(1,236)
Other comprehensive income / (loss) before reclassifications	(31)	(35)
Amounts reclassified from accumulated other comprehensive income	0	0
Total other comprehensive income / (loss)	(31)	(35)
Balance at end of period	(1,200)	(1,271)
Gains and losses on cash flow hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	27	2	$ 15	$ 4
Other comprehensive income / (loss) before reclassifications	13	(2)
Amounts reclassified from accumulated other comprehensive income	(1)	0
Total other comprehensive income / (loss)	12	(2)
Balance at end of period	$ 27	$ 2