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Condensed Consolidated Balance Sheets Balance Sheets Parentheticals (USD $)
In Millions, except Share data, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Commitments and Contingencies (Note 12)      
Total common stock outstanding (in shares) 429,795,830 428,798,446
Cash and cash equivalents 206 208
Bad Debt Reserve 26 28
Accounts receivable, net 834 851
Prepaid expenses and other current assets 173 125
Regulatory assets 3,519 3,726
Variable Interest Entity, Primary Beneficiary [Member]
   
Cash and cash equivalents 188 207
Accounts receivable, net 94 60
Prepaid expenses and other current assets 51 41
Regulatory assets $ 2,971 $ 3,179