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Commitments and Other Contingencies (Tables)
12 Months Ended
Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]  
Operating Leases of Lessee Disclosure
Future minimum commitments under noncancellable operating leases are as follows (dollars in millions):
2016
349

2017
217

2018
165

2019
102

2020
62

Thereafter
277

 
$
1,172