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Debt and Credit Agreements (Tables)
12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Debt at December 2018 and December 2017 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)
2018
2018
2018
2017
Notes
2020-2068
4.5%
$
14,558

$
11,591

Equipment Obligations(a)
2019-2023
6.3%
195

213

Capital Leases
2020-2026
16.2%
4

5

Subtotal Long-term Debt (including current portion)
 
 
$
14,757

$
11,809

Less Debt Due within One Year
 
 
(18
)
(19
)
Long-term Debt (excluding current portion)
 
 
$
14,739

$
11,790


(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 2018
2019
$
18

2020
745

2021
371

2022
192

2023
639

Thereafter
12,792

Total Long-term Debt Maturities, including current portion
$
14,757