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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2017
$
(2
)
 
$
(1
)
 
$
(235
)
 
$
(238
)
Adoption of new accounting standard (Note 1)
—

 
—

 
(61
)
 
(61
)
WPZ Merger (Note 1)
(3
)
 
—

 
—

 
(3
)
Other comprehensive income (loss):
 
 
 
 
 
 
 
Other comprehensive income (loss) before reclassifications
(2
)
 
—

 
(6
)
 
(8
)
Amounts reclassified from accumulated other comprehensive income (loss)
5

 
—

 
35

 
40

Other comprehensive income (loss)
3

 
—

 
29

 
32

Balance at December 31, 2018
$
(2
)
 
$
(1
)
 
$
(267
)
 
$
(270
)
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, 2018:
Component
 
Reclassifications
 
Classification
 
 
(Millions)
 
 
Cash flow hedges:
 
 
 
 
Energy commodity contracts
 
$
9

 
Product sales
Pension and other postretirement benefits:
 
 
 
 
Amortization of actuarial (gain) loss and net actuarial loss from settlements included in net periodic benefit cost (credit)
 
46

 
Note 10 – Employee Benefit Plans
Total before tax
 
55

 
 
Income tax benefit
 
(12
)
 
Provision (benefit) for income taxes
  Net of income tax
 
43

 
 
  Noncontrolling interest
 
(3
)
 
Net income (loss) attributable to noncontrolling interests
Reclassifications during the period
 
$
40