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Stock-Based Compensation (Schedule Of Stock Available For Future Grants) (Details)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Ltip      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Available for future grants 4,899,428us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockOptionMember
5,945,033us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockOptionMember
7,638,688us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockOptionMember
Shares of Common Stock issued 2,168,641us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockOptionMember
2,765,986us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockOptionMember
2,337,179us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockOptionMember
TSOP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Available for future grants 998,896us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= nsc_TsopMember
1,172,256us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= nsc_TsopMember
1,434,356us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= nsc_TsopMember
Shares of Common Stock issued 252,042us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_PlanNameAxis
= nsc_TsopMember
331,282us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_PlanNameAxis
= nsc_TsopMember
153,423us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_PlanNameAxis
= nsc_TsopMember