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Leases and Other Commitment (Tables)
 12 Months Ended
Dec. 31, 2016
Leases [Abstract]  
Operating leases and capital leases [Table Text Block]
(millions)
 
Operating
leases
 
Capital
leases
2017
 
$
172

 
$
1

2018
 
143

 
1

2019
 
104

 
1

2020
 
71

 
—

2021
 
66

 
—

2022 and beyond
 
69

 
—

Total minimum payments
 
$
625

 
$
3

Amount representing interest
 
 
 
—

Obligations under capital leases
 
 
 
3

Obligations due within one year
 
 
 
(1
)
Long-term obligations under capital leases
 
 
 
$
2