XML 80 R61.htm IDEA: XBRL DOCUMENT
v3.22.4

Investments (Held-to-maturity credit quality indicator) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Debt Securities, Held-to-maturity | $ 8,882 | $ 10,153
Fixed Maturities Percent of Total Amortized cost | 100.00% | 100.00%
Standard & Poor's, AAA Rating [Member] |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Debt Securities, Held-to-maturity | $ 1,612 | $ 2,089
Fixed Maturities Percent of Total Amortized cost | 18.00% | 21.00%
Standard & Poor's, AA Rating [Member] |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Debt Securities, Held-to-maturity | $ 5,023 | $ 5,303
Fixed Maturities Percent of Total Amortized cost | 57.00% | 52.00%
Standard & Poor's, A Rating [Member] |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Debt Securities, Held-to-maturity | $ 1,634 | $ 1,964
Fixed Maturities Percent of Total Amortized cost | 18.00% | 19.00%
Standard & Poor's, BBB Rating [Member] |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Debt Securities, Held-to-maturity | $ 593 | $ 773
Fixed Maturities Percent of Total Amortized cost | 7.00% | 8.00%
Standard & Poor's, BB Rating [Member] |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Debt Securities, Held-to-maturity | $ 20 | $ 23
Fixed Maturities Percent of Total Amortized cost | 0.00% | 0.00%
Other [Member] |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Debt Securities, Held-to-maturity | $ 0 | $ 1
Fixed Maturities Percent of Total Amortized cost | 0.00% | 0.00%

X
- Definition Fixed Maturities Percent of Total Amortized cost + References No definition available. + Details
Name: | cb_FixedMaturitiesPercentOfTotalAmortizedCost
Namespace Prefix: | cb_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919253-210447 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953401-111524 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27232-111563 + Details
Name: | us-gaap_HeldToMaturitySecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | srt_CreditRatingStandardPoorsAxis=srt_StandardPoorsAAARatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CreditRatingStandardPoorsAxis=srt_StandardPoorsAARatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CreditRatingStandardPoorsAxis=srt_StandardPoorsARatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CreditRatingStandardPoorsAxis=srt_StandardPoorsBBBRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CreditRatingStandardPoorsAxis=srt_StandardPoorsBBRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CreditRatingStandardPoorsAxis=cb_OtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |