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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Stockholders' Equity Note [Abstract]  
Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following table presents the changes in AOCI by component, net of income taxes:
 
Cash
Flow
Hedges
 
Foreign
Currency
Translation
 
Pension and
Other Post
Retirement
Benefits
 
Total
 
(Millions)
Balance at December 31, 2016
$
—

 
$
(2
)
 
$
(337
)
 
$
(339
)
Other comprehensive income (loss) before reclassifications
(6
)
 
1

 
44

 
39

Amounts reclassified from accumulated other comprehensive income (loss)
4

 
—

 
58

 
62

Other comprehensive income (loss)
(2
)
 
1

 
102

 
101

Balance at December 31, 2017
$
(2
)
 
$
(1
)
 
$
(235
)
 
$
(238
)
Reclassifications Out Of Accumulated Other Comprehensive Income [Table Text Block]
Reclassifications out of AOCI are presented in the following table by component for the year ended December 31, 2017:
Component
 
Reclassifications
 
Classification
 
 
(Millions)
 
 
Cash flow hedges:
 
 
 
 
Energy commodity contracts
 
$
7

 
Product sales and Product costs
Pension and other postretirement benefits:
 
 
 
 
Amortization of prior service cost (credit) included in net periodic benefit cost (credit)
 
(5
)
 
Note 9 – Employee Benefit Plans
Amortization of actuarial (gain) loss and net actuarial loss from settlements included in net periodic benefit cost (credit)
 
98

 
Note 9 – Employee Benefit Plans
Total before tax
 
100

 
 
Income tax benefit
 
(36
)
 
Provision (benefit) for income taxes
  Net of income tax
 
64

 
 
  Noncontrolling interest
 
(2
)
 
Net income (loss) attributable to noncontrolling interests
Reclassifications during the period
 
$
62