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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Minimum rentals on operating leases [Table Text Block]
Minimum non-cancelable operating lease commitments at December 31, 2017 were as follows (in millions):
 
2018
 
2019
 
2020
 
2021
 
2022
 
Thereafter
Minimum rentals on operating leases
$
17

 
$
16

 
$
13

 
$
10

 
$
9

 
$
37