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Description of Business, Basis of Presentation, and Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Regulatory Assets and Liabilities [Table Text Block]
Our current and noncurrent regulatory asset and liability balances for the years ended December 31, 2014 and 2013 are as follows:

 
December 31,
 
2014
 
2013
 
(Millions)
Current assets reported within Other current assets and deferred charges
$
81

 
$
39

Noncurrent assets reported within Regulatory assets, deferred charges, and other
337

 
353

Total regulated assets
$
418

 
$
392

 
 
 
 
Current liabilities reported within Accrued liabilities
$
11

 
$
19

Noncurrent liabilities reported within Other noncurrent liabilities
375

 
329

Total regulated liabilities
$
386

 
$
348