XML 94 R74.htm IDEA: XBRL DOCUMENT v3.24.0.1

Pensions and Other Postretirement Benefits - Benefit Assumptions (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Return on assets in plans	8.00%
Funded Plan | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.23%	5.56%	2.97%
Future salary increases	4.44%	4.44%	4.44%
Funded Plan | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.11%	5.45%	2.72%
Unfunded Plan | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Future salary increases	4.44%	4.44%	4.44%
Discount rate - service cost	5.75%	3.25%	3.14%
Discount rate - interest cost	5.40%	2.45%	1.95%
Return on assets in plans	8.00%	8.00%	8.00%
Unfunded Plan | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate - service cost	5.56%	3.01%	2.71%
Discount rate - interest cost	5.23%	2.13%	1.57%
Return on assets in plans	7.75%	7.75%	7.75%
Health care trend rate	7.00%	6.50%	6.00%

X

- Definition

Defined Benefit Plan Assumed Health Care Cost Trend Rate

+ References

No definition available.

+ Details

Name:	nsc_DefinedBenefitPlanAssumedHealthCareCostTrendRate
Namespace Prefix:	nsc_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate For Interest Cost

+ References

No definition available.

+ Details

Name:	nsc_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRateForInterestCost
Namespace Prefix:	nsc_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate For Service Cost

+ References

No definition available.

+ Details

Name:	nsc_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRateForServiceCost
Namespace Prefix:	nsc_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

+ Details

Name:	us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-8

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

+ Details

Name:	us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (k)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

+ Details

Name:	us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanFundingStatusAxis=us-gaap_FundedPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanFundingStatusAxis=us-gaap_UnfundedPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: