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Fair value measurements Fair Value Measurements (Annuitization Experience for GMIB Policies) (Details) | 12 Months Ended
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Dec. 31, 2017
One Year Of Credible Experience [Member] |  |
Annuitization Experience For GMIB Policies [Line Items] |  |
Percent of GMIB guaranteed value that are represented by clients with several years of annuitization experience | 67.00% |
Several Years Of Credible Experience [Member] |  |
Annuitization Experience For GMIB Policies [Line Items] |  |
Percent of GMIB guaranteed value that are represented by clients with several years of annuitization experience | 3.00% |
Several Years Of Credible Experience [Member] | Subsequent years [Member] |  |
Annuitization Experience For GMIB Policies [Line Items] |  |
Annuitization rate | 0.00% |
No Credible Experience [Member] |  |
Annuitization Experience For GMIB Policies [Line Items] |  |
Percent of GMIB guaranteed value that are represented by clients with several years of annuitization experience | 30.00% |
No Credible Experience [Member] | First Year [Member] |  |
Annuitization Experience For GMIB Policies [Line Items] |  |
Annuitization rate | 0.00% |
No Credible Experience [Member] | Subsequent years [Member] |  |
Annuitization Experience For GMIB Policies [Line Items] |  |
Annuitization rate | 0.00% |
Maximum |  |
Annuitization Experience For GMIB Policies [Line Items] |  |
Annuitization rate | 100.00% | [1]
Maximum | One Year Of Credible Experience [Member] | First Year [Member] |  |
Annuitization Experience For GMIB Policies [Line Items] |  |
Annuitization rate | 52.00% |
Maximum | One Year Of Credible Experience [Member] | Subsequent years [Member] |  |
Annuitization Experience For GMIB Policies [Line Items] |  |
Annuitization rate | 100.00% |
Maximum | Several Years Of Credible Experience [Member] | Subsequent years [Member] |  |
Annuitization Experience For GMIB Policies [Line Items] |  |
Annuitization rate | 100.00% |
Maximum | No Credible Experience [Member] | First Year [Member] |  |
Annuitization Experience For GMIB Policies [Line Items] |  |
Annuitization rate | 56.00% |
Maximum | No Credible Experience [Member] | Subsequent years [Member] |  |
Annuitization Experience For GMIB Policies [Line Items] |  |
Annuitization rate | 36.00% |
Minimum |  |
Annuitization Experience For GMIB Policies [Line Items] |  |
Annuitization rate | 0.00% | [1]
Minimum | One Year Of Credible Experience [Member] | First Year [Member] |  |
Annuitization Experience For GMIB Policies [Line Items] |  |
Annuitization rate | 2.00% |
Minimum | One Year Of Credible Experience [Member] | Subsequent years [Member] |  |
Annuitization Experience For GMIB Policies [Line Items] |  |
Annuitization rate | 1.00% |
Minimum | Several Years Of Credible Experience [Member] | Subsequent years [Member] |  |
Annuitization Experience For GMIB Policies [Line Items] |  |
Annuitization rate | 12.00% |
Minimum | No Credible Experience [Member] | First Year [Member] |  |
Annuitization Experience For GMIB Policies [Line Items] |  |
Annuitization rate | 25.00% |
Minimum | No Credible Experience [Member] | Subsequent years [Member] |  |
Annuitization Experience For GMIB Policies [Line Items] |  |
Annuitization rate | 12.00% |
[1] | Discussion of the most significant inputs used in the fair value measurement of GLB and the sensitivity of those assumptions is included within Note 4 a) Guaranteed living benefits.

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- Definition [Line Items] for Schedule of annuitization experience for GMIB policies [Table] + References No definition available. + Details
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Namespace Prefix: | cb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The percentage of GMIB guaranteed value + References No definition available. + Details
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Data Type: | num:percentItemType
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- Definition Significant Unobservable Inputs Annuitization Rate + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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