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Fair Value Measurements and Guarantees (Tables)
 6 Months Ended
Jun. 30, 2014
Fair Value Disclosures [Abstract]  
Fair Value Assets and Liabilities Measured On Recurring Basis [Text Block]
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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 June 30, 2014:
 
 
 
 
 
 
 
 
 
Measured on a recurring basis:
 
 
 
 
 
 
 
 
 
ARO Trust investments
$
42

 
$
42

 
$
42

 
$
—

 
$
—

Energy derivatives assets not designated as hedging instruments
3

 
3

 
—

 
—

 
3

Energy derivatives liabilities not designated as hedging instruments
(2
)
 
(2
)
 
—

 
—

 
(2
)
Additional disclosures:
 
 
 
 
 
 
 
 
 
Notes receivable and other
36

 
82

 
2

 
5

 
75

Long-term debt, including current portion (1)
(16,289
)
 
(17,684
)
 
—

 
(17,684
)
 
—

Guarantee
(31
)
 
(28
)
 
—

 
(28
)
 
—

Assets (liabilities) at December 31, 2013:
 
 
 
 
 
 
 
 
 
Measured on a recurring basis:
 
 
 
 
 
 
 
 
 
ARO Trust investments
$
33

 
$
33

 
$
33

 
$
—

 
$
—

Energy derivatives assets not designated as hedging instruments
3

 
3

 
—

 
—

 
3

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

 
(1
)
 
(2
)
Additional disclosures:
 
 
 
 
 
 
 
 
 
Notes receivable and other
77

 
140

 
1

 
6

 
133

Long-term debt (1)
(11,353
)
 
(11,971
)
 
—

 
(11,971
)
 
—

Guarantee
(32
)
 
(29
)
 
—

 
(29
)
 
—

 
(1) Excludes capital leases