Schedule II Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2017

Valuation and Qualifying Accounts Disclosure [Line Items]

Schedule II - Valuation and Qualifying Accounts

Comcast Corporation and Subsidiaries

Schedule II – Valuation and Qualifying Accounts

Year ended December 31, 2017, 2016 and 2015

Year Ended December 31 (in millions)	Balance at Beginning of Year		Additions Charged to Costs and Expenses(a)		Deductions from Reserves(a)		Balance at End of Year
2017
Allowance for doubtful accounts	$	250	$	72	$	34	$	288
Allowance for returns and customer incentives	417		974		972		419
Valuation allowance on deferred tax assets	266		111		—		377
2016
Allowance for doubtful accounts	$	226	$	86	$	62	$	250
Allowance for returns and customer incentives	473		1,041		1,097		417
Valuation allowance on deferred tax assets	342		23		99		266
2015
Allowance for doubtful accounts	$	205	$	166	$	145	$	226
Allowance for returns and customer incentives	359		1,236		1,122		473
Valuation allowance on deferred tax assets	375		4		37		342

NBCUniversal Media LLC [Member]

Valuation and Qualifying Accounts Disclosure [Line Items]

Schedule II - Valuation and Qualifying Accounts

NBCUniversal Media, LLC

Schedule II – Valuation and Qualifying Accounts

Year ended December 31, 2017, 2016 and 2015

Year Ended December 31 (in millions)	Balance at Beginning of Year		Additions Charged to Costs and Expenses(a)		Deductions from Reserves(a)		Balance at End of Year
2017
Allowance for doubtful accounts	$	84	$	23	$	19	$	88
Allowance for returns and customer incentives	413		955		954		414
Valuation allowance on deferred tax assets	72		15		—		87
2016
Allowance for doubtful accounts	$	69	$	26	$	11	$	84
Allowance for returns and customer incentives	469		1,040		1,096		413
Valuation allowance on deferred tax assets	71		23		22		72
2015
Allowance for doubtful accounts	$	60	$	27	$	18	$	69
Allowance for returns and customer incentives	356		1,233		1,120		469
Valuation allowance on deferred tax assets	87		4		20		71

(a) Additions and deductions related to allowance for returns and customer incentives include amounts for distribution on behalf of third parties.