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Basis of Presentation and Summary of Significant Accounting Policies (Details 4) (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2012
item
Apr. 01, 2011
Dec. 31, 2012
Minimum
Dec. 31, 2012
Maximum
Dec. 31, 2012
Customer relationships
Dec. 31, 2012
Capitalized software
Maximum
Dec. 31, 2012
Trademark and trade name
Mar. 31, 2011
Predecessor
Dec. 31, 2010
Predecessor
Revenue Recognition                    
Customer relationship period over which revenue is recognized       18 months 10 years          
Term of IRUs   20 years                
Affiliates Transactions                    
Non-cash dividends recognized   $ 38                
Advertising Costs                    
Advertising expense 176 102             66 296
Income Taxes                    
Valuation allowance, primarily related to state NOLs and state credits 256 260               139
Accounts Receivable and Allowance for Doubtful Accounts                    
Period of accounts past due       30 days            
Property, Plant and Equipment                    
Asset retirement obligation $ 62 $ 59 $ 98           $ 64 $ 63
Goodwill, Customer Relationships and Other Intangible Assets                    
Estimated life           10 years 7 years 4 years    
Number of reporting units   1                
Number of operating segments   1