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Consolidated Statements Of Cash Flows (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities:      
Net income $ 2,000us-gaap_ProfitLoss $ 1,910us-gaap_ProfitLoss $ 1,749us-gaap_ProfitLoss
Reconciliation of net income to net cash provided by operating activities:      
Depreciation 956us-gaap_Depreciation 922us-gaap_Depreciation 922us-gaap_Depreciation
Deferred income taxes 294us-gaap_DeferredIncomeTaxExpenseBenefit 262us-gaap_DeferredIncomeTaxExpenseBenefit 366us-gaap_DeferredIncomeTaxExpenseBenefit
Gains and losses on properties and investments (13)us-gaap_GainLossOnDispositionOfAssets1 (104)us-gaap_GainLossOnDispositionOfAssets1 (6)us-gaap_GainLossOnDispositionOfAssets1
Changes in assets and liabilities affecting operations:      
Accounts receivable (31)us-gaap_IncreaseDecreaseInAccountsReceivable 85us-gaap_IncreaseDecreaseInAccountsReceivable (64)us-gaap_IncreaseDecreaseInAccountsReceivable
Materials and supplies (13)us-gaap_IncreaseDecreaseInMaterialsAndSupplies (7)us-gaap_IncreaseDecreaseInMaterialsAndSupplies (7)us-gaap_IncreaseDecreaseInMaterialsAndSupplies
Other current assets (260)us-gaap_IncreaseDecreaseInOtherCurrentAssets (5)us-gaap_IncreaseDecreaseInOtherCurrentAssets (6)us-gaap_IncreaseDecreaseInOtherCurrentAssets
Current liabilities other than debt 53us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 5us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 82us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Other – net (134)us-gaap_OtherOperatingActivitiesCashFlowStatement 10us-gaap_OtherOperatingActivitiesCashFlowStatement 29us-gaap_OtherOperatingActivitiesCashFlowStatement
Net cash provided by operating activities 2,852us-gaap_NetCashProvidedByUsedInOperatingActivities 3,078us-gaap_NetCashProvidedByUsedInOperatingActivities 3,065us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:      
Property additions (2,118)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,971)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (2,241)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Property sales and other transactions 114us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 144us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 192us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Investments, including short-term (104)us-gaap_PaymentsToAcquireInvestments (130)us-gaap_PaymentsToAcquireInvestments (23)us-gaap_PaymentsToAcquireInvestments
Investment sales and other transactions 106us-gaap_PaymentsForProceedsFromOtherInvestingActivities 63us-gaap_PaymentsForProceedsFromOtherInvestingActivities 78us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash used in investing activities (2,002)us-gaap_NetCashProvidedByUsedInInvestingActivities (1,894)us-gaap_NetCashProvidedByUsedInInvestingActivities (1,994)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:      
Dividends (687)us-gaap_PaymentsOfDividendsCommonStock (637)us-gaap_PaymentsOfDividendsCommonStock (624)us-gaap_PaymentsOfDividendsCommonStock
Common Stock issued 130nsc_ProceedsFromStockOptionsExercisedIncludingTaxBenefit 131nsc_ProceedsFromStockOptionsExercisedIncludingTaxBenefit 89nsc_ProceedsFromStockOptionsExercisedIncludingTaxBenefit
Purchase and retirement of Common Stock (318)us-gaap_PaymentsForRepurchaseOfCommonStock (627)us-gaap_PaymentsForRepurchaseOfCommonStock (1,288)us-gaap_PaymentsForRepurchaseOfCommonStock
Proceeds from borrowings – net 200us-gaap_ProceedsFromDebtNetOfIssuanceCosts 989us-gaap_ProceedsFromDebtNetOfIssuanceCosts 1,491us-gaap_ProceedsFromDebtNetOfIssuanceCosts
Debt repayments (645)us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations (250)us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations (362)us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations
Net cash used in financing activities (1,320)us-gaap_NetCashProvidedByUsedInFinancingActivities (394)us-gaap_NetCashProvidedByUsedInFinancingActivities (694)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net increase (decrease) in cash and cash equivalents (470)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 790us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 377us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents:      
At beginning of year 1,443us-gaap_CashAndCashEquivalentsAtCarryingValue 653us-gaap_CashAndCashEquivalentsAtCarryingValue 276us-gaap_CashAndCashEquivalentsAtCarryingValue
At end of year 973us-gaap_CashAndCashEquivalentsAtCarryingValue 1,443us-gaap_CashAndCashEquivalentsAtCarryingValue 653us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosures of cash flow information:      
Interest (net of amounts capitalized) 522us-gaap_InterestPaidNet 492us-gaap_InterestPaidNet 473us-gaap_InterestPaidNet
Income taxes (net of refunds) $ 1,102us-gaap_IncomeTaxesPaidNet $ 735us-gaap_IncomeTaxesPaidNet $ 618us-gaap_IncomeTaxesPaidNet