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v3.22.2

Subsequent Events (Details) - Forecast $ in Millions | 3 Months Ended
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Sep. 30, 2022 USD ($)
Subsequent Event [Line Items] |
Decrease in income taxes | $ 135
Decrease in deferred income taxes | $ 135

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- Definition Increase (Decrease) In Deferred Income Taxes, Change In Tax Rate + References No definition available. + Details
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Namespace Prefix: | nsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Increase (Decrease) In Income Taxes Expense (Benefit) + References No definition available. + Details
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Namespace Prefix: | nsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |