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Debt and Credit Arrangements - Long Term Debt (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Long Term Debt $ 3,300us-gaap_LongTermDebt $ 3,300us-gaap_LongTermDebt
5.75% Notes due May 15, 2018 [Member]    
Debt Instrument [Line Items]    
Long Term Debt 600us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= cb_NotesThreeMember
600us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= cb_NotesThreeMember
6.6% Debentures due August 15, 2018 [Member]    
Debt Instrument [Line Items]    
Long Term Debt 100us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= cb_DebentureOneMember
100us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= cb_DebentureOneMember
6.8% Debentures due November 15, 2031 [Member]    
Debt Instrument [Line Items]    
Long Term Debt 200us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= cb_DebentureTwoMember
200us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= cb_DebentureTwoMember
6% Notes due May 11, 2037 [Member]    
Debt Instrument [Line Items]    
Long Term Debt 800us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= cb_NotesFourMember
800us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= cb_NotesFourMember
6.5% Notes due May 15, 2038 [Member]    
Debt Instrument [Line Items]    
Long Term Debt 600us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= cb_NotesFiveMember
600us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= cb_NotesFiveMember
6.375% Capital Securities due March 29, 2067 [Member]    
Debt Instrument [Line Items]    
Long Term Debt $ 1,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= cb_CapitalSecuritiesMember
$ 1,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= cb_CapitalSecuritiesMember