XML 76 R84.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Intangible Assets (Roll-forward of Goodwill by Business Segment) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Roll Forward] |  |
Balance at beginning of period | $ 15,271 | $ 15,541
Foreign exchange revaluation and other | 25 | (270)
Balance at end of period | 15,296 | 15,271
North America Commercial P&C Insurance |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 6,946 | 6,976
Foreign exchange revaluation and other | 9 | (30)
Balance at end of period | 6,955 | 6,946
Segment Insurance North American Personal P&C [Member] [Member] |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 2,230 | 2,240
Foreign exchange revaluation and other | 4 | (10)
Balance at end of period | 2,234 | 2,230
North America Agricultural Insurance |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 134 | 134
Foreign exchange revaluation and other | 0 | 0
Balance at end of period | 134 | 134
Overseas General Insurance |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 4,770 | 5,004
Foreign exchange revaluation and other | 15 | (234)
Balance at end of period | 4,785 | 4,770
Segment Global Reinsurance [Member] |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 371 | 365
Foreign exchange revaluation and other | 0 | 6
Balance at end of period | 371 | 371
Life Insurance |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 820 | 822
Foreign exchange revaluation and other | (3) | (2)
Balance at end of period | $ 817 | $ 820

X
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
Name: | us-gaap_Goodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillForeignCurrencyTranslationGainLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_GoodwillRollForward
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_StatementBusinessSegmentsAxis=cb_SegmentInsuranceNorthAmericanPersonalPCMemberMember
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_StatementBusinessSegmentsAxis=cb_SegmentGlobalReinsuranceMember
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: |