Long-term Debt (Tables)

6 Months Ended

Jun. 30, 2016

Debt Disclosure [Abstract]

Schedule of long-term debt

Long-term Debt consisted of the following:

(Dollars in millions)	June 30, 2016		December 31, 2015
5.50% Senior Notes due 2016	$	—	$	350
6.35% Senior Notes due 2017	90		604
6.00% Senior Notes due 2018	66		498
9.625% Senior Notes due 2019	491		1,012
5.125% Senior Notes due 2020	364		768
5.875% Exchangeable Senior Notes due 2021	1,136		—
7.75% Senior Notes due 2021	738		—
4.50% Senior Notes due 2022	642		642
8.25% Senior Notes due 2023	738		—
6.50% Senior Notes due 2036	446		446
6.80% Senior Notes due 2037	255		255
7.00% Senior Notes due 2038	455		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	496		—
4.82% secured borrowing	7		9
Capital and other lease obligations	109		116
Other	11		29
Total Senior Notes and other debt	7,113		6,253
Less amounts due in one year	170		401
Long-term debt	$	6,943	$	5,852