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Schedule II - Condensed Financial Information, Statements of Cash Flows (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash Flows from Operating Activities    
Shareholders' net income $ 533us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 528us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Adjustments to reconcile shareholders' net income to net cash provided by operating activities:    
Other liabilities 157ci_IncreaseDecreaseInAccountsPayableAccruedAndOtherOperatingLiabilities (107)ci_IncreaseDecreaseInAccountsPayableAccruedAndOtherOperatingLiabilities
Other, net (56)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet (47)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net cash provided by / (used in) operating activities 664us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 490us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash Flows from Investing Activities    
Other, net 0us-gaap_PaymentsForProceedsFromOtherInvestingActivities 12us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash provided by/ (used in) investing activities (49)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (506)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash Flows from Financing Activities    
Net change in short-term debt (5)us-gaap_ProceedsFromRepaymentsOfShortTermDebt (6)us-gaap_ProceedsFromRepaymentsOfShortTermDebt
Net proceeds on issuance of long-term debt 894us-gaap_ProceedsFromIssuanceOfLongTermDebt 0us-gaap_ProceedsFromIssuanceOfLongTermDebt
Issuance of common stock 99us-gaap_ProceedsFromIssuanceOfCommonStock 43us-gaap_ProceedsFromIssuanceOfCommonStock
Repurchase of common stock (413)us-gaap_PaymentsForRepurchaseOfCommonStock (615)us-gaap_PaymentsForRepurchaseOfCommonStock
Net cash provided by / (used in) financing activities 603us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (499)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net increase (decrease) in cash and cash equivalents 1,200us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (519)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, January 1 1,420us-gaap_CashAndCashEquivalentsAtCarryingValue 2,795us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, March 31 $ 2,620us-gaap_CashAndCashEquivalentsAtCarryingValue $ 2,276us-gaap_CashAndCashEquivalentsAtCarryingValue