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Debt and Credit Agreements (Tables)
12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments

Debt at December 2019 and December 2018 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
December
December
(Dollars in Millions)
2019
2019
2019
2018
Notes
2020-2068
4.4%
$
16,056

$
14,558

Equipment Obligations(a)
2020-2023
6.3%
178

195

Finance Leases
2020-2026
15.0%
4

4

Subtotal Long-term Debt (including current portion)
 
 
$
16,238

$
14,757

Less Debt Due within One Year
 
 
(245
)
(18
)
Long-term Debt (excluding current portion)
 
 
$
15,993

$
14,739


(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 Ending
December 2019
2020
$
245

2021
401

2022
162

2023
639

2024
551

Thereafter
14,240

Total Long-term Debt Maturities, including current portion
$
16,238