Leases (Tables)

12 Months Ended

Dec. 31, 2017

Leases [Abstract]

Schedule of Commitments Relating to Noncancellable Operating Leases

Commitments relating to noncancellable operating leases for each of the next five years and thereafter are as follows (dollars in millions):

For the Year Ended December 31,
2018	$	289
2019		278
2020		239
2021		198
2022		157
Thereafter		1,118
		2,279
Less sublease income		(11	)
	$	2,268