XML 76 R65.htm IDEA: XBRL DOCUMENT
v3.20.2

Shareholders' equity Dividends Declared (Details) | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2020 $ / shares | Jun. 30, 2020 SFr / shares | Jun. 30, 2019 $ / shares | Jun. 30, 2019 SFr / shares | Jun. 30, 2020 $ / shares | Jun. 30, 2020 SFr / shares | Jun. 30, 2019 $ / shares | Jun. 30, 2019 SFr / shares | May 20, 2020 $ / shares | May 31, 2019 $ / shares | May 31, 2018 $ / shares
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Annual dividend per share approved by shareholders |  |  |  |  |  |  |  |  | $ 3.12 | $ 3.00 | $ 2.92
Common Stock, Dividend Rate Approved |  |  |  |  |  |  |  |  | $ 0.78 | $ 0.75 | $ 0.73
United States of America, Dollars |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ 0.78 |  | $ 0.75 |  | $ 1.53 |  | $ 1.48 |  |  |  |
Switzerland, Francs |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | SFr / shares |  | SFr 0.75 |  | SFr 0.75 |  | SFr 1.47 |  | SFr 1.47 |  |  |

X
- Definition Annual dividend per share approved by shareholders + References No definition available. + Details
Name: | cb_Annualdividendpershareapprovedbyshareholders
Namespace Prefix: | cb_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Common Stock, Dividend Rate Approved + References No definition available. + Details
Name: | cb_CommonStockDividendRateApproved
Namespace Prefix: | cb_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
Name: | us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
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_EquityClassOfTreasuryStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_CurrencyAxis=currency_USD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_CHF
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |