Long-term Debt

We have issued various senior notes, all of which rank equally with our existing and future senior unsecured indebtedness, which have semi-annual interest payments and no sinking fund requirements. Our Long-term Debt consisted of the following:



	December 31,
(Dollars in millions)	2015		2014
5.50% Senior Notes due 2016	$	350	$	352
6.35% Senior Notes due 2017	604		607
6.00% Senior Notes due 2018	499		498
9.625% Senior Notes due 2019	1,014		1,018
5.125% Senior Notes due 2020	771		798
4.50% Senior Notes due 2022	644		715
6.50% Senior Notes due 2036	449		556
6.80% Senior Notes due 2037	257		298
7.00% Senior Notes due 2038	459		497
9.875% Senior Notes due 2039	247		247
6.75% Senior Notes due 2040	460		596
5.95% Senior Notes due 2042	372		478
4.82% secured borrowing	9		12
Capital and other lease obligations	116		136
Other	29		40
Total Senior Notes and other debt	6,280		6,848
Less amounts due in one year	401		50
Long-term debt	$	5,879	$	6,798

The following is a summary of scheduled Long-term Debt maturities by year (dollars in millions):



2016	$	401
2017	630
2018	514
2019	1,005
2020	812
Thereafter	2,918
	$	6,280

In 2015, through a series of open market transactions, we repurchased certain of our 4.5% senior notes, 5.125% senior notes, 5.95% senior notes, 6.5% senior notes, 6.75% senior notes, 6.80% senior notes and 7.00% senior notes with a total book value of $527 million. We recognized a cumulative gain of approximately $84 million on these transactions in the line captioned “Other, Net” on the accompanying Consolidated Statements of Operations.

In December 2014, through a series of open market transactions, we repurchased certain of our 4.5% senior notes, 5.95% senior notes and 6.5% senior notes with an aggregate book value of $138 million and recognized a gain of approximately $11 million in the line captioned “Other, Net” on the accompanying Consolidated Statements of Operations.