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Fair Value Measurements and Guarantees (Tables)
 3 Months Ended
Mar. 31, 2018
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
The following table presents, by level within the fair value hierarchy, certain of our financial assets and liabilities. The carrying values of cash and cash equivalents, accounts receivable, and accounts payable approximate fair value because of the short-term nature of these instruments. Therefore, these assets and liabilities are not presented in the following table.
 
 
 
 
 
Fair Value Measurements Using
 
 Carrying 
Amount
 
Fair
Value
 
Quoted
Prices In
Active
 Markets for 
Identical
Assets
(Level 1)
 
 Significant 
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
(Millions)
Assets (liabilities) at March 31, 2018:
 
 
 
 
 
 
 
 
 
Measured on a recurring basis:
 
 
 
 
 
 
 
 
 
ARO Trust investments
$
145

 
$
145

 
$
145

 
$
—

 
$
—

Energy derivatives assets designated as hedging instruments
2

 
2

 
2

 
—

 
—

Energy derivatives assets not designated as hedging instruments
4

 
4

 
4

 
—

 
—

Energy derivatives liabilities designated as hedging instruments
(3
)
 
(3
)
 
(3
)
 
—

 
—

Energy derivatives liabilities not designated as hedging instruments
(4
)
 
(4
)
 
(1
)
 
—

 
(3
)
Additional disclosures:
 
 
 
 
 
 
 
 
 
Other receivables
7

 
7

 
7

 
—

 
—

Long-term debt, including current portion
(17,512
)
 
(18,307
)
 
—

 
(18,307
)
 
—

 
 
 
 
 
 
 
 
 
 
Assets (liabilities) at December 31, 2017:
 
 
 
 
 
 
 
 
 
Measured on a recurring basis:
 
 
 
 
 
 
 
 
 
ARO Trust investments
$
135

 
$
135

 
$
135

 
$
—

 
$
—

Energy derivatives liabilities designated as hedging instruments
(3
)
 
(3
)
 
(2
)
 
(1
)
 
—

Energy derivatives liabilities not designated as hedging instruments
(3
)
 
(3
)
 
—

 
—

 
(3
)
Additional disclosures:
 
 
 
 
 
 
 
 
 
Other receivables
7

 
7

 
7

 
—

 
—

Long-term debt, including current portion
(16,497
)
 
(18,112
)
 
—

 
(18,112
)
 
—