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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Purchase Obligations

Future minimum payments required under these commitments as of December 31, 2018 are as follows:

	Purchase Obligations
(Dollars in millions)
2019	$	1,444
2020	137
2021	78
2022	39
2023	14
Thereafter	25
Total	$	1,737

Lease commitments

As of December 31, 2018, 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)
2019	$	170			$	59
2020	158				48
2021	142				35
2022	126				23
2023	110				10
Thereafter	784				7
Total	$	1,490			$	182

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Tabular disclosure for lessee's operating leases. Includes, but is not limited to, description of lessee's operating lease, existence and terms of renewal or purchase options and escalation clauses, restrictions imposed by lease, such as those concerning dividends, additional debt, and further leasing, rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions.

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Tabular disclosure of information about obligations resulting from other commitments.

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