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Commitments and Other Contingencies (Tables)
12 Months Ended
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]  
Operating Leases of Lessee Disclosure
Future minimum commitments under noncancellable operating leases are as follows (dollars in millions):
2017
$
214

2018
166

2019
102

2020
60

2021
45

Thereafter
201

 
$
788