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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2013
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 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
)
 
—

Assets (liabilities) at December 31, 2012:
 
 
 
 
 
 
 
 
 
Measured on a recurring basis:
 
 
 
 
 
 
 
 
 
ARO Trust investments
$
18

 
$
18

 
$
18

 
$
—

 
$
—

Energy derivatives assets not designated as hedging instruments
5

 
5

 
—

 
—

 
5

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

 
—

 
(1
)
Additional disclosures:
 
 
 
 
 
 
 
 
 
Notes receivable and other
95

 
138

 
2

 
8

 
128

Long-term debt (1)
(10,734
)
 
(12,388
)
 
—

 
(12,388
)
 
—

Guarantee
(33
)
 
(31
)
 
—

 
(31
)
 
—

________________
(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,
 
2013
 
2012
 
(Millions)
NGLs, natural gas, and related products and services
$
341

 
$
411

Transportation of natural gas and related products
193

 
170

Income tax receivable
74

 
68

Other
66

 
39

Total
$
674

 
$
688