Accumulated Other Comprehensive Loss Attributable to Crown Holdings (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	$ 3,499	$ 3,372	$ 3,172	$ 3,045	$ 2,977	$ 2,932	$ 3,499	$ 3,045	$ 3,228	$ 2,864
Total other comprehensive income	28	43	(35)	333	(114)	13	36	232
Balance at end of period	3,499	3,372	3,172	3,045	2,977	2,932	3,499	3,045
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(1,427)	(1,456)	(1,497)	(1,457)	(1,785)	(1,671)	(1,427)	(1,457)	(1,462)	(1,687)
Other comprehensive income / (loss) before reclassifications							32	(196)
Amounts reclassified from accumulated other comprehensive income							3	426
Total other comprehensive income	29	41	(35)	328	(114)	16	35	230
Balance at end of period	(1,427)	$ (1,456)	$ (1,497)	(1,457)	$ (1,785)	$ (1,671)	(1,427)	(1,457)
Defined benefit plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(224)			(247)			(224)	(247)	(230)	(664)
Other comprehensive income / (loss) before reclassifications							(1)	1
Amounts reclassified from accumulated other comprehensive income							7	416
Total other comprehensive income							6	417
Balance at end of period	(224)			(247)			(224)	(247)
Foreign currency translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(1,211)			(1,212)			(1,211)	(1,212)	(1,236)	(1,022)
Other comprehensive income / (loss) before reclassifications							25	(190)
Amounts reclassified from accumulated other comprehensive income							0	0
Total other comprehensive income							25	(190)
Balance at end of period	(1,211)			(1,212)			(1,211)	(1,212)
Gains and losses on cash flow hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	8			2			8	2	$ 4	$ (1)
Other comprehensive income / (loss) before reclassifications							8	(7)
Amounts reclassified from accumulated other comprehensive income							(4)	10
Total other comprehensive income							4	3
Balance at end of period	$ 8			$ 2			$ 8	$ 2