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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Future minimum payments required under these commitments are as follows:

		Purchase
		Obligations
(Dollars in millions)
2018	$	1,177
2019		657
2020		73
2021		42
2022		21
Thereafter		31
Total	$	2,001

Lease Commitments

As of December 31, 2017, future minimum rental payments required under operating leases and rental receipts expected under operating leases that have noncancellable lease terms in excess of one year were as follows:

	Operating Leases Future Minimum Rental Payments		Operating Leases Future Minimum Rental Receipts
(Dollars in millions)
2018	$	145	$	54
2019		133		45
2020		120		34
2021		107		21
2022		92		9
Thereafter		737		2
Total	$	1,334	$	165