XML 63 R40.htm IDEA: XBRL DOCUMENT
v3.20.4

Stock-Based Compensation (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Schedule of Options Granted Under LTIP and TSOP | The Committee granted stock options, RSUs and PSUs pursuant to the LTIP for the last three years as follows:
| 2020 |  | 2019 |  | 2018
| Granted |  | Weighted- Average Grant-Date Fair Value |  | Granted |  | Weighted- Average Grant-Date Fair Value |  | Granted |  | Weighted- Average Grant-Date Fair Value
Stock options | 43,770 |  | $ | 52.05 |  |  | 47,360 |  | $ | 45.74 |  |  | 40,960 |  | $ | 41.70 |
RSUs | 178,190 |  | 210.11 |  |  | 219,710 |  | 164.47 |  |  | 217,290 |  | 148.37 |
PSUs | 78,830 |  | 212.66 |  |  | 102,250 |  | 160.97 |  |  | 92,314 |  | 147.47 |
Schedule of Compensation Costs and Tax Benefits | Related compensation costs and tax benefits during the years were:
| 2020 |  | 2019 |  | 2018
| ($ in millions)
Stock-based compensation expense | $ | 28 |  |  | $ | 53 |  |  | $ | 47 |
Total tax benefit | 44 |  |  | 37 |  |  | 33 |
Schedule of Assumptions Used for LTIP And TSOP Grants | The assumptions for the LTIP grants for the last three years are shown in the following table:
| 2020 |  | 2019 |  | 2018
Average expected volatility | 22 | % |  | 23 | % |  | 24 | %
Average risk-free interest rate | 1.47 | % |  | 2.56 | % |  | 2.55 | %
Average expected option term | 7.5 years |  | 7.2 years |  | 7.2 years
Schedule of Stock Option Activity | A summary of changes in stock options is presented below:
| Stock Options |  | Weighted- Average Exercise Price
Outstanding at December 31, 2019 | 2,677,449 |  |  | $ | 91.51 |
Granted | 43,770 |  |  | 213.54 |
Exercised | (1,171,786) |  |  | 86.12 |
Forfeited | (23,308) |  |  | 156.02 |
Outstanding at December 31, 2020 | 1,526,125 |  |  | 98.17 |
Summary of Stock Options Exercised | The following table provides information related to options exercised for the last three years:
| 2020 |  | 2019 |  | 2018
| ($ in millions)
Options exercised | 1,171,786 |  |  | 770,597 |  |  | 840,175 |
Total intrinsic value | $ | 144 |  |  | $ | 86 |  |  | $ | 72 |
Cash received upon exercise | 98 |  |  | 53 |  |  | 58 |
Related tax benefits realized | 29 |  |  | 18 |  |  | 16 |
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity |
| 2020 |  | 2019 |  | 2018
| ($ in millions)
RSUs vested | 204,665 |  |  | 166,197 |  |  | 160,200 |
Common Stock issued net of tax withholding | 146,047 |  |  | 119,346 |  |  | 99,968 |
Related tax benefit realized | $ | 4 |  |  | $ | 2 |  |  | $ | 3 |
A summary of changes in RSUs is presented below:
| RSUs |  | Weighted- Average Grant-Date Fair Value
Nonvested at December 31, 2019 | 666,172 |  |  | $ | 127.77 |
Granted | 178,190 |  |  | 210.11 |
Vested | (204,665) |  |  | 130.87 |
Forfeited | (39,457) |  |  | 171.33 |
Nonvested at December 31, 2020 | 600,240 |  |  | 148.29 |
Schedule of Other Share Activity |
| 2020 |  | 2019 |  | 2018
| ($ in millions)
PSUs earned | 235,935 |  |  | 331,099 |  |  | 154,189 |
Common Stock issued net of tax withholding | 156,477 |  |  | 221,241 |  |  | 94,399 |
Related tax benefit realized | $ | 7 |  |  | $ | 9 |  |  | $ | 3 |
A summary of changes in PSUs is presented below:
| PSUs |  | Weighted- Average Grant-Date Fair Value
Balance at December 31, 2019 | 456,510 |  |  | $ | 114.04 |
Granted | 78,830 |  |  | 212.66 |
Earned | (235,935) |  |  | 89.70 |
Unearned | (33,705) |  |  | 58.77 |
Forfeited | (25,600) |  |  | 177.41 |
Balance at December 31, 2020 | 240,100 |  |  | 171.34 |
Schedule of Stock Available for Future Grants | Shares of Common Stock available for future grants and issued in connection with all features of the LTIP and the TSOP at December 31, were as follows:
| 2020 |  | 2019 |  | 2018
Available for future grants: |  |  |  |  |
LTIP | 8,995,582 |  |  | 9,294,726 |  |  | 8,644,108 |
TSOP | 435,699 |  |  | 434,401 |  |  | 422,973 |
Issued: |  |  |  |  |
LTIP | 1,270,208 |  |  | 852,869 |  |  | 820,746 |
TSOP | 204,102 |  |  | 258,315 |  |  | 213,796 |

X
- Definition Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average exercise price, table [Table Text Block] + References No definition available. + Details
Name: | nsc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePriceTableTableTextBlock
Namespace Prefix: | nsc_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of cash received from exercise of stock options and similar instruments granted under share-based payment arrangements and tax benefit from exercise of stock options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=SL79508275-113901 + Details
Name: | us-gaap_CashProceedsReceivedAndTaxBenefitFromShareBasedPaymentAwardsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
Name: | us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration