v3.8.0.1
Commitments (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Annual Non-Cancelable Minimum Lease Payments
Annual non-cancelable minimum lease payments over the next five years and thereafter are as follows ($ in millions):
 
2018
$
146

2019
153

2020
138

2021
116

2022
73

Thereafter
167

 
$
793