Debt and Credit Agreements (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

Debt at December 2017 and December 2016 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)	2017	2017	2017			2016
Notes	2020-2066	4.3%	$	11,591		$	11,055
Equipment Obligations(a)	2018-2023	6.3%	213			232
Capital Leases	2018-2026	16.2%	5			6
Subtotal Long-term Debt (including current portion)			$	11,809		$	11,293
Less Debt Due within One Year			(19		)	(331		)
Long-term Debt (excluding current portion)			$	11,790		$	10,962

(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 as of
Fiscal Years Ending	December 2017
2018	$	19
2019	18
2020	745
2021	371
2022	162
Thereafter	10,494
Total Long-term Debt Maturities, including current portion	$	11,809