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Fair Value Measurements Guarantees and Concentration of Credit Risk (Tables)
12 Months Ended
Dec. 31, 2014
Fair Value Disclosures [Abstract]  
Fair Value Assets and Liabilities Measured On Recurring Basis [Table 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 December 31, 2014:
 
 
 
 
 
 
 
 
 
Measured on a recurring basis:
 
 
 
 
 
 
 
 
 
ARO Trust investments
$
48

 
$
48

 
$
48

 
$

 
$

Energy derivatives assets not designated as hedging instruments
3

 
3

 
1

 

 
2

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

 

 
(2
)
Additional disclosures:
 
 
 
 
 
 
 
 
 
Notes receivable and other
30

 
57

 

 
4

 
53

Long-term debt, including current portion (1)
(20,887
)
 
(21,131
)
 

 
(21,131
)
 

Guarantee
(31
)
 
(27
)
 

 
(27
)
 

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, including current portion (1)
(11,353
)
 
(11,971
)
 

 
(11,971
)
 

Guarantee
(32
)
 
(29
)
 

 
(29
)
 

________________
(1) Excludes capital leases
Concentration of receivables, net of allowances, by product or service [Table Text Block]
The following table summarizes concentration of receivables, net of allowances.  
 
December 31,
 
2014
 
2013
 
(Millions)
NGLs, natural gas, and related products and services
$
730

 
$
341

Transportation of natural gas and related products
175

 
193

Income tax receivable
167

 
74

Other
67

 
66

Total
$
1,139

 
$
674