XML 74 R62.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Shareholders' equity Dividends declared (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 $ / shares | Jun. 30, 2017 SFr / shares | Jun. 30, 2016 $ / shares | Jun. 30, 2016 SFr / shares | Jun. 30, 2017 $ / shares | Jun. 30, 2017 SFr / shares | Jun. 30, 2016 $ / shares | Jun. 30, 2016 SFr / shares
Dividends Declared [Abstract] |  |  |  |  |  |  |  |
Common Stock, Dividend Rate Declared | (per share) | $ 0.71 | SFr 0.69 | $ 0.69 | SFr 0.68 | $ 1.40 | SFr 1.38 | $ 1.36 | SFr 1.34

X
- Definition Dividends Declared [Abstract] + References No definition available. + Details
Name: | cb_DividendsDeclaredAbstract
Namespace Prefix: | cb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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