Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Debt Instrument Table

The following table details our long-term debt:

	December 31,
(In millions)	2017			2016
Senior unsecured notes:
6.000% notes due 2017	—			682
5.900% notes due 2018	—			854
7.500% notes due 2019	—			228
2.700% notes due 2020(a)	600			600
2.800% notes due 2022(a)	1,000			1,000
9.375% notes due 2022 (b)	32			32
Series A notes due 2022 (b)	3			3
8.500% notes due 2023 (b)	70			70
8.125% notes due 2023 (b)	131			131
3.850% notes due 2025(a)	900			900
4.400% notes due 2027(a)	1,000			—
6.800% notes due 2032(a)	550			550
6.600% notes due 2037(a)	750			750
5.200% notes due 2045(a)	500			500
Capital leases:
Capital lease obligation expiring in 2018	—			1
Other obligations:
5.125% obligation relating to revenue bonds due 2037	—			1,000
Total(b)	5,536			7,301
Unamortized discount	(10		)	(9		)
Fair value adjustments(c)	—			7
Unamortized debt issuance cost	(32		)	(35		)
Amounts due within one year	—			(683		)
Total long-term debt	$	5,494		$	6,581

^(a)  These notes contain a make-whole provision allowing us to repay the debt at a premium to market price.

^(b)  In the event of a change in control, as defined in the related agreements, debt obligations totaling $236 million at December 31, 2017 may be declared immediately due and payable.

^(c)  See Notes 13 and 14 for information on historical interest rate swaps.

Five Year Schedule Of Debt Payments Table

The following table shows future debt payments:

(In millions)
2018	$	—
2019	—
2020	600
2021	—
2022	1,035
Thereafter	3,901
Total long-term debt, including current portion	$	5,536