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Income Taxes (Tax Loss and Credit Carryforwards Expirations) (Details) $ in Millions	Dec. 31, 2020 USD ($)
Income Tax Disclosure [Abstract]
2021	$ 20
2022	75
2023	12
2024	13
2025	27
Thereafter	141
Unlimited	$ 145

X

- Definition

Tax loss and credit carryforwards, expire in after year five

+ References

No definition available.

+ Details

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X

- Definition

Tax loss and credit carryforwards, expire in year five

+ References

No definition available.

+ Details

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Namespace Prefix:	cck_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Tax loss and credit carryforwards, expire in year four

+ References

No definition available.

+ Details

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- Definition

Tax loss and credit carryforwards, expire in year one

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Tax loss and credit carryforwards, expire in year three

+ References

No definition available.

+ Details

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Namespace Prefix:	cck_
Data Type:	xbrli:monetaryItemType
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- Definition

Tax loss and credit carryforwards, expire in year two

+ References

No definition available.

+ Details

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X

- Definition

Tax loss and credit carryforwards, expire, unlimited

+ References

No definition available.

+ Details

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Namespace Prefix:	cck_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- References

No definition available.

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