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Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2017
Stockholders' Equity Note [Abstract]  
Accumulated Other Comprehensive Income (Loss) [Table Text Block]
AOCI
The following table presents the changes in Accumulated other comprehensive income (loss) (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
(3
)
 
—

 
—

 
(3
)
Amounts reclassified from accumulated other comprehensive income (loss)
—

 
—

 
11

 
11

Other comprehensive income (loss)
(3
)
 
—

 
11

 
8

Balance at September 30, 2017
$
(3
)
 
$
(2
)
 
$
(326
)
 
$
(331
)
Reclassifications Out Of Accumulated Other Comprehensive Income [Table Text Block]
Reclassifications out of AOCI are presented in the following table by component for the nine months ended September 30, 2017:
Component
 
Reclassifications
 
Classification
 
 
(Millions)
 
 
Cash flow hedges:
 
 
 
 
Energy commodity contracts
 
$
(1
)
 
Product sales
 
 
 
 
 
Pension and other postretirement benefits:
 
 
 
 
Amortization of prior service cost (credit) included in net periodic benefit cost
 
(4
)
 
Note 8 – Employee Benefit Plans
Amortization of actuarial (gain) loss included in net periodic benefit cost
 
20

 
Note 8 – Employee Benefit Plans
 
 
 
 
 
Total before tax
 
15

 
 
Income tax benefit
 
(4
)
 
Provision (benefit) for income taxes
Reclassifications during the period
 
$
11