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Commitments and Contingencies (Details) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2022 USD ($) location | Dec. 31, 2021 USD ($) location
Commitments and Contingencies Disclosure [Abstract] |  |
Environmental liability | $ 56,000,000 | $ 49,000,000
Current environmental liability | $ 15,000,000 | $ 15,000,000
Known cleanup and remediation locations and projects | location | 91 | 88
Number of sites - representative sample | location | 19 |
Liability associated with those sites | $ 45,000,000 |
Environmental locations representative sample liability payout period, in years | 5 years |
Responsible locations with another party | location | 8 |
Employees covered by collective bargaining agreements, percentage | 80.00% |
Self-insured injury/damage to third parties - and above, per occurrence | $ 75,000,000 |
Self-insured injury/damage to third party - up to | 800,000,000 |
Self-insured injury/damage to third parties - and above, per occurrence for specific perils | $ 1,100,000,000 |
Percentage of potential losses covered | 82.00% |
Self-insured NS owned property - and above, per occurrence | $ 75,000,000 |
Self-insured NS owned property - up to | $ 275,000,000 |

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