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Earnings Per Share (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Earnings Per Share [Abstract]      
Shareholders' net income $ 533us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic   $ 528us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Shares:      
Weighted average 256,707,000us-gaap_WeightedAverageNumberOfSharesIssuedBasic   269,979,000us-gaap_WeightedAverageNumberOfSharesIssuedBasic
Common stock equivalents 4,539,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements   4,488,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Total shares 261,246,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding   274,467,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
EPS, basic $ 2.08us-gaap_EarningsPerShareBasic   $ 1.96us-gaap_EarningsPerShareBasic
EPS, effect of dilution $ (0.04)ci_EarningsPerShareEffectOfDilution   $ (0.04)ci_EarningsPerShareEffectOfDilution
EPS, diluted $ 2.04us-gaap_EarningsPerShareDiluted   $ 1.92us-gaap_EarningsPerShareDiluted
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Common shares held in Treasury 38,421,636us-gaap_TreasuryStockShares   97,428,469us-gaap_TreasuryStockShares
Shares of treasury stock retired   70,000,000us-gaap_TreasuryStockSharesRetired  
Employee Stock Option [Member]      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Antidilutive options 1,400,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
  0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember