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Property, Plant, and Equipment (Tables)
 12 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Property, Plant, and Equipment [Table Text Block]
 
Estimated
Useful Life  (1)
(Years)
 
Depreciation
Rates (1)
(%)
 
 
December 31,
2013

2012
 
 
 
 
 
(Millions)
Nonregulated:
 
 
 
 
 
 
 
Natural gas gathering and processing facilities
5 - 40
 
 
 
$
9,185

 
$
7,727

Construction in progress
Not applicable
 
 
 
3,123

 
1,997

Other
3 - 45
 
 
 
1,316

 
1,103

Regulated:
 
 
 
 
 
 
 
Natural gas transmission facilities
 
 
1.20 - 6.97
 
10,633

 
9,963

Construction in progress
 
 
Not applicable
 
273

 
337

Other
 
 
1.35 - 33.33
 
1,293

 
1,419

Total property, plant, and equipment, at cost
 
 
 
 
25,823

 
22,546

Accumulated depreciation and amortization
 
 
 
 
(7,613
)
 
(7,079
)
Property, plant, and equipment — net
 
 
 
 
$
18,210

 
$
15,467

__________
(1)
Estimated useful life and depreciation rates are presented as of December 31, 2013. Depreciation rates for regulated assets are prescribed by the FERC.
Asset Retirement Obligation [Table Text Block]
 
December 31,
 
2013
 
2012
 
(Millions)
Beginning balance
$
579

 
$
573

Liabilities incurred
8

 
8

Liabilities settled (1)
(31
)
 
(44
)
Accretion expense
53

 
43

Revisions (2)
(48
)
 
(1
)
Ending balance
$
561

 
$
579

______________
(1)
For 2013 and 2012, liabilities settled include $25 million and $31 million, respectively, related to the abandonment of certain of Transco’s natural gas storage caverns that are associated with a leak in 2010.

(2)
Several factors are considered in the annual review process, including inflation rates, current estimates for removal cost, discount rates, and the estimated remaining life of the assets. The 2013 revision primarily reflects increases in the estimated remaining useful life of the assets. The 2012 revision primarily reflects a decrease in removal cost estimates. The 2013 and 2012 revisions also include increases of $9 million and $13 million, respectively, related to changes in the timing and method of abandonment on certain of Transco’s natural gas storage caverns that were associated with a leak in 2010.