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Schedule II Valuation and Qualifying Accounts (Tables)
12 Months Ended
Dec. 31, 2015
Schedule II-Valuation and Qualifying Accounts
Comcast Corporation and Subsidiaries
Schedule II — Valuation and Qualifying Accounts
Year ended December 31, 2015, 2014 and 2013
Year Ended December 31 (in millions)Balance at Beginning of YearAdditions Charged to Costs and Expenses(a)Deductions from Reserves(a)Balance at End of Year
2015
Allowance for doubtful accounts$205$166$145$226
Allowance for returns and customer incentives3591,2361,122473
Valuation allowance on deferred tax assets375437342
2014
Allowance for doubtful accounts$221$162$178$205
Allowance for returns and customer incentives375932948359
Valuation allowance on deferred tax assets4053363375
2013
Allowance for doubtful accounts$198$317$294$221
Allowance for returns and customer incentives307811743375
Valuation allowance on deferred tax assets3557121405
NBCUniversal Media LLC [Member]  
Schedule II-Valuation and Qualifying Accounts
NBCUniversal Media, LLC
Schedule II — Valuation and Qualifying Accounts
Year ended December 31, 2015, 2014 and 2013
Year Ended December 31 (in millions)Balance at Beginning of YearAdditions Charged to Costs and Expenses(a)Deductions from Reserves(a)Balance at End of Year
2015
Allowance for doubtful accounts$60$27$18$69
Allowance for returns and customer incentives3561,2331,120469
Valuation allowance on deferred tax assets8742071
2014
Allowance for doubtful accounts$65$11$16$60
Allowance for returns and customer incentives372930946356
Valuation allowance on deferred tax assets6033687
2013
Allowance for doubtful accounts$46$33$14$65
Allowance for returns and customer incentives307808743372
Valuation allowance on deferred tax assets7382160