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General, Description of Business, Basis of Presentation, and Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2016
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, 2016 and 2015 are as follows:
 
December 31,
 
2016
 
2015
 
(Millions)
Current assets reported within Other current assets and deferred charges
$
91

 
$
84

Noncurrent assets reported within Regulatory assets, deferred charges, and other
387

 
370

Total regulated assets
$
478

 
$
454

 
 
 
 
Current liabilities reported within Accrued liabilities
$
11

 
$
4

Noncurrent liabilities reported within Regulatory liabilities, deferred income, and other
498

 
434

Total regulated liabilities
$
509

 
$
438