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Schedule II - Condensed Financial Information, Statements of Cash Flows (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash Flows from Operating Activities      
Shareholders' net income $ 2,102us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 1,476us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 1,623us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Adjustments to reconcile shareholders' net income to net cash provided by operating activities:      
Other liabilities 202ci_IncreaseDecreaseInAccountsPayableAccruedAndOtherOperatingLiabilities (483)ci_IncreaseDecreaseInAccountsPayableAccruedAndOtherOperatingLiabilities (132)ci_IncreaseDecreaseInAccountsPayableAccruedAndOtherOperatingLiabilities
Other, net (83)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet (82)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet 10us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net cash provided by / (used in) operating activities 1,994us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 719us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 2,350us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash Flows from Investing Activities      
Other, net (24)us-gaap_PaymentsForProceedsFromOtherInvestingActivities (42)us-gaap_PaymentsForProceedsFromOtherInvestingActivities 0us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash provided by/ (used in) investing activities (1,755)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations 15us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (3,857)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash Flows from Financing Activities      
Net change in short-term debt (112)us-gaap_ProceedsFromRepaymentsOfShortTermDebt (101)us-gaap_ProceedsFromRepaymentsOfShortTermDebt 98us-gaap_ProceedsFromRepaymentsOfShortTermDebt
Repayment of long-term debt 0us-gaap_RepaymentsOfLongTermDebt (15)us-gaap_RepaymentsOfLongTermDebt (326)us-gaap_RepaymentsOfLongTermDebt
Issuance of common stock 110us-gaap_ProceedsFromIssuanceOfCommonStock 150us-gaap_ProceedsFromIssuanceOfCommonStock 121us-gaap_ProceedsFromIssuanceOfCommonStock
Common dividends paid (11)us-gaap_PaymentsOfDividendsCommonStock (11)us-gaap_PaymentsOfDividendsCommonStock (11)us-gaap_PaymentsOfDividendsCommonStock
Repurchase of common stock (1,612)us-gaap_PaymentsForRepurchaseOfCommonStock (1,003)us-gaap_PaymentsForRepurchaseOfCommonStock (208)us-gaap_PaymentsForRepurchaseOfCommonStock
Net cash (used in) / provided by financing activities (1,582)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (930)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (228)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net increase (decrease) in cash and cash equivalents (1,375)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (183)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (1,712)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of year 2,795us-gaap_CashAndCashEquivalentsAtCarryingValue 2,978us-gaap_CashAndCashEquivalentsAtCarryingValue 4,690us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of year 1,420us-gaap_CashAndCashEquivalentsAtCarryingValue 2,795us-gaap_CashAndCashEquivalentsAtCarryingValue 2,978us-gaap_CashAndCashEquivalentsAtCarryingValue
Parent Company [Member]      
Cash Flows from Operating Activities      
Shareholders' net income 2,102us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,476us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,623us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Adjustments to reconcile shareholders' net income to net cash provided by operating activities:      
Equity in income from subsidiaries (2,358)us-gaap_IncomeLossFromSubsidiariesNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1,702)us-gaap_IncomeLossFromSubsidiariesNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1,932)us-gaap_IncomeLossFromSubsidiariesNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Dividends received from subsidiaries 1,648us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
506us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
671us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other liabilities (73)ci_IncreaseDecreaseInAccountsPayableAccruedAndOtherOperatingLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(245)ci_IncreaseDecreaseInAccountsPayableAccruedAndOtherOperatingLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(213)ci_IncreaseDecreaseInAccountsPayableAccruedAndOtherOperatingLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other, net 173us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
63us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
191us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash provided by / (used in) operating activities 1,492us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
98us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
340us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash Flows from Investing Activities      
Other, net 11us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(19)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash provided by/ (used in) investing activities 11us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(19)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash Flows from Financing Activities      
Net change in amounts due to / from affiliates 61ci_IncreaseDecreaseInAmountsDueToFromAffiliates
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
751ci_IncreaseDecreaseInAmountsDueToFromAffiliates
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(208)ci_IncreaseDecreaseInAmountsDueToFromAffiliates
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net change in short-term debt 0us-gaap_ProceedsFromRepaymentsOfShortTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(100)us-gaap_ProceedsFromRepaymentsOfShortTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
100us-gaap_ProceedsFromRepaymentsOfShortTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Issuance of common stock 110us-gaap_ProceedsFromIssuanceOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
150us-gaap_ProceedsFromIssuanceOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
121us-gaap_ProceedsFromIssuanceOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Common dividends paid (11)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(11)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(11)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Repurchase of common stock (1,612)us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1,003)us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(208)us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash (used in) / provided by financing activities (1,452)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(213)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(206)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net increase (decrease) in cash and cash equivalents 51us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(115)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
115us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash and cash equivalents, beginning of year 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
115us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash and cash equivalents, end of year $ 51us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
$ 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
$ 115us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember