XML 148 R131.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Segment Information (Net Premiums Earned For Segment By Product) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | $ 36,355 | $ 33,117 | $ 31,290
North America Commercial P&C Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 15,461 | 13,964 | 12,922
North America Commercial P&C Insurance [Member] | Property and other short-tail [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 2,942 | 2,423 | 1,987
North America Commercial P&C Insurance [Member] | Casualty and all other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 11,905 | 10,812 | 10,136
North America Commercial P&C Insurance [Member] | Accident and Health [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 614 | 729 | 799
North America Personal P&C Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 4,915 | 4,866 | 4,694
North America Personal P&C Insurance [Member] | Personal automobile [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 781 | 822 | 829
North America Personal P&C Insurance [Member] | Personal homeowners [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 3,384 | 3,327 | 3,183
North America Personal P&C Insurance [Member] | Personal other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 750 | 717 | 682
North America Agricultural Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 2,338 | 1,822 | 1,795
Overseas General Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 10,441 | 9,285 | 8,882
Overseas General Insurance [Member] | Property and other short-tail [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 3,105 | 2,468 | 2,244
Overseas General Insurance [Member] | Casualty and all other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 3,114 | 2,738 | 2,494
Overseas General Insurance [Member] | Accident and Health [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 2,113 | 2,098 | 2,248
Overseas General Insurance [Member] | Personal lines [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 2,109 | 1,981 | 1,896
Global Reinsurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 798 | 698 | 654
Global Reinsurance [Member] | Property and other short-tail [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 151 | 104 | 131
Global Reinsurance [Member] | Casualty and all other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 457 | 421 | 381
Global Reinsurance [Member] | Property catastrophe [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 190 | 173 | 142
Life Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 2,402 | 2,482 | 2,343
Life Insurance [Member] | Accident and Health [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | 1,082 | 1,165 | 1,242
Life Insurance [Member] | Life [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net premiums earned | $ 1,320 | $ 1,317 | $ 1,101

X
- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column E)) -URI http://asc.fasb.org/extlink&oid=120401096&loc=d3e574992-122915 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(c)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
Name: | us-gaap_PremiumsEarnedNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cb_SegmentNorthAmericaCommercialPCInsuranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsegmentsAxis=cb_PropertyandothershorttailMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsegmentsAxis=cb_CasualtyandallotherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsegmentsAxis=us-gaap_AccidentAndHealthInsuranceSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cb_SegmentInsuranceNorthAmericanPersonalPCMemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsegmentsAxis=us-gaap_AutomobilesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsegmentsAxis=cb_PersonalhomeownerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsegmentsAxis=us-gaap_OtherInsuranceProductLineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cb_SegmentInsuranceNorthAmericanAgricultureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cb_SegmentInsuranceOverseasGeneralMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsegmentsAxis=cb_PersonalLinesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cb_SegmentGlobalReinsuranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsegmentsAxis=cb_PropertycatastropheMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cb_SegmentLifeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsegmentsAxis=us-gaap_LifeInsuranceSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |