XML 114 R98.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Pension and Other Postretirement Benefits (Summary of Strategic Ranges for Assets Allocation Plan) (Details) - Pension Plan | Dec. 31, 2017
--- | ---
Minimum | U.S. Plans | Equities | United States |
Defined Benefit Plan Disclosure [Line Items] |
Target plan asset allocations, minimum | 38.00%
Minimum | U.S. Plans | Equities | International |
Defined Benefit Plan Disclosure [Line Items] |
Target plan asset allocations, minimum | 12.00%
Minimum | U.S. Plans | Fixed income |
Defined Benefit Plan Disclosure [Line Items] |
Target plan asset allocations, minimum | 15.00%
Minimum | U.S. Plans | Balanced funds |
Defined Benefit Plan Disclosure [Line Items] |
Target plan asset allocations, minimum | 12.00%
Minimum | U.S. Plans | Real estate |
Defined Benefit Plan Disclosure [Line Items] |
Target plan asset allocations, minimum | 5.00%
Minimum | Non-U.S. Plans | Equities | United Kingdom |
Defined Benefit Plan Disclosure [Line Items] |
Target plan asset allocations, minimum | 0.00%
Minimum | Non-U.S. Plans | Real estate | United Kingdom |
Defined Benefit Plan Disclosure [Line Items] |
Target plan asset allocations, minimum | 0.00%
Minimum | Non-U.S. Plans | Private equity | United Kingdom |
Defined Benefit Plan Disclosure [Line Items] |
Target plan asset allocations, minimum | 0.00%
Minimum | Non-U.S. Plans | Investment grade credit | United Kingdom |
Defined Benefit Plan Disclosure [Line Items] |
Target plan asset allocations, minimum | 30.00%
Minimum | Non-U.S. Plans | Hedge funds | United Kingdom |
Defined Benefit Plan Disclosure [Line Items] |
Target plan asset allocations, minimum | 0.00%
Minimum | Non-U.S. Plans | Alternative credit | United Kingdom |
Defined Benefit Plan Disclosure [Line Items] |
Target plan asset allocations, minimum | 0.00%
Minimum | Non-U.S. Plans | Other | United Kingdom |
Defined Benefit Plan Disclosure [Line Items] |
Target plan asset allocations, minimum | 0.00%
Maximum | U.S. Plans | Equities | United States |
Defined Benefit Plan Disclosure [Line Items] |
Target plan asset allocations, minimum | 48.00%
Maximum | U.S. Plans | Equities | International |
Defined Benefit Plan Disclosure [Line Items] |
Target plan asset allocations, minimum | 18.00%
Maximum | U.S. Plans | Fixed income |
Defined Benefit Plan Disclosure [Line Items] |
Target plan asset allocations, minimum | 25.00%
Maximum | U.S. Plans | Balanced funds |
Defined Benefit Plan Disclosure [Line Items] |
Target plan asset allocations, minimum | 18.00%
Maximum | U.S. Plans | Real estate |
Defined Benefit Plan Disclosure [Line Items] |
Target plan asset allocations, minimum | 10.00%
Maximum | Non-U.S. Plans | Equities | United Kingdom |
Defined Benefit Plan Disclosure [Line Items] |
Target plan asset allocations, minimum | 30.00%
Maximum | Non-U.S. Plans | Real estate | United Kingdom |
Defined Benefit Plan Disclosure [Line Items] |
Target plan asset allocations, minimum | 5.00%
Maximum | Non-U.S. Plans | Private equity | United Kingdom |
Defined Benefit Plan Disclosure [Line Items] |
Target plan asset allocations, minimum | 15.00%
Maximum | Non-U.S. Plans | Investment grade credit | United Kingdom |
Defined Benefit Plan Disclosure [Line Items] |
Target plan asset allocations, minimum | 90.00%
Maximum | Non-U.S. Plans | Hedge funds | United Kingdom |
Defined Benefit Plan Disclosure [Line Items] |
Target plan asset allocations, minimum | 10.00%
Maximum | Non-U.S. Plans | Alternative credit | United Kingdom |
Defined Benefit Plan Disclosure [Line Items] |
Target plan asset allocations, minimum | 20.00%
Maximum | Non-U.S. Plans | Other | United Kingdom |
Defined Benefit Plan Disclosure [Line Items] |
Target plan asset allocations, minimum | 15.00%

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_DomesticPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=cck_InternationalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_FixedIncomeFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=cck_BalanceFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_RealEstateFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=country_GB
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_PrivateEquityFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=cck_InvestmentGradeCreditFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_HedgeFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=cck_AlternativeCreditFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=cck_OtherPlanAssetCategoriesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |