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Debt and Credit Agreements (Tables)
 12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments Debt at December 2021 and December 2020 is shown in the table below. For information regarding the fair value of debt, see Note 13, Fair Value Measurements.
Maturity at
December		Average
Interest
Rates at
December		DecemberDecember
(Dollars in Millions)2021202120212020
Notes2022-20684.2%$16,166 $16,542 
Equipment Obligations(a)
2022-20246.2%153 160 
Finance Leases2022-20326.1%47 3 
Subtotal Long-term Debt (including current portion) $16,366 $16,705 
Less Debt Due within One Year  (181)(401)
Long-term Debt (excluding current portion)  $16,185 $16,304 
(a) Equipment obligations are secured by an interest in certain railroad equipment.
Schedule of Long-term Debt Maturities
Long-term Debt Maturities (Net of Discounts, Premiums and Issuance Costs)
(Dollars in Millions)Maturities at
Fiscal Years EndingDecember 2021
2022$181 
2023153 
2024560 
2025605 
2026704 
Thereafter14,163 
Total Long-term Debt Maturities, including current portion$16,366