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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]  
Minimum rentals on operating leases [Table Text Block]
Minimum non-cancelable operating lease commitments at December 31, 2016 were as follows (in millions):
 
2017
 
2018
 
2019
 
2020
 
2021
 
Thereafter
Minimum rentals on operating leases
$
18

 
$
11

 
$
8

 
$
6

 
$
4

 
$
8