Leases (Tables)

12 Months Ended

Dec. 31, 2015

Leases [Abstract]

Future minimum lease payments for capital leases and noncancelable operating leases

Future minimum lease payments with respect to capital leases and operating leases with noncancelable terms in excess of one year were as follows:

	Capital			Operating
(dollars in millions)	Lease Payments			Lease Payments
Year ending December 31:
2016	$	18		$	109
2017	15			81
2018	10			62
2019	5			54
2020	4			50
Thereafter	47			139
Future minimum lease payments	99			495
Less: amount representing interest	(39		)	—
Lease obligations at December 31, 2015	$	60		$	495