Long-term Debt (Tables)

12 Months Ended

Dec. 31, 2016

Debt Disclosure [Abstract]

Schedule of 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)	2016		2015
5.50% Senior Notes due 2016	$	—	$	350
6.35% Senior Notes due 2017	89		604
6.00% Senior Notes due 2018	66		498
9.625% Senior Notes due 2019	489		1,012
5.125% Senior Notes due 2020	363		768
5.875% Exchangeable Senior Notes due 2021	1,147		—
7.75% Senior Notes due 2021	739		—
4.50% Senior Notes due 2022	642		642
8.25% Senior Notes due 2023	738		—
9.875% Senior Notes due 2024	528		—
6.50% Senior Notes due 2036	447		446
6.80% Senior Notes due 2037	255		255
7.00% Senior Notes due 2038	456		455
9.875% Senior Notes due 2039	245		245
6.75% Senior Notes due 2040	456		456
5.95% Senior Notes due 2042	368		368
Secured Term Loan due 2020	420		—
4.82% secured borrowing	5		9
Capital and other lease obligations	120		116
Other	7		29
Total Senior Notes and other debt	7,580		6,253
Less amounts due in one year	177		401
Long-term debt	$	7,403	$	5,852

Schedule of maturities of long-term debt

The accrued interest on our borrowings was $127 million and $115 million at December 31, 2016 and 2015, respectively. The following is a summary of scheduled Long-term Debt maturities by year (dollars in millions):

2017	$	177
2018	137
2019	541
2020	675
2021	1,889
Thereafter	4,161
	$	7,580