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Note Payable (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Debt Disclosure    
Number of lines of credit 1cinf_NumberOfCreditFacilities  
Aggregate borrowing capacity 225us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity  
Accordian feature available amount 50us-gaap_ProceedsFromLinesOfCredit  
Line of credit facility, term 5 years  
Expiration date of Line of credit May 13, 2019  
Note payable 49us-gaap_NotesPayable 104us-gaap_NotesPayable
Minimum    
Debt Disclosure    
Line of credit, interest rate 1.15%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 1.30%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum    
Debt Disclosure    
Line of credit, interest rate 1.30%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 1.35%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_RangeAxis
= us-gaap_MaximumMember