Schedule II Valuation and Qualifying Accounts (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended	11 Months Ended	12 Months Ended	11 Months Ended	12 Months Ended	11 Months Ended	12 Months Ended
Dec. 31, 2013 Allowance for Doubtful Accounts [Member]	Dec. 31, 2012 Allowance for Doubtful Accounts [Member]	Dec. 31, 2011 Allowance for Doubtful Accounts [Member]	Dec. 31, 2011 Allowance for Doubtful Accounts [Member] NBCUniversal Media, LLC [Member]	Dec. 31, 2013 Allowance for Doubtful Accounts [Member] NBCUniversal Media, LLC [Member]	Dec. 31, 2012 Allowance for Doubtful Accounts [Member] NBCUniversal Media, LLC [Member]	Dec. 31, 2013 Sales Returns and Allowances [Member]	Dec. 31, 2012 Sales Returns and Allowances [Member]	Dec. 31, 2011 Sales Returns and Allowances [Member]	Dec. 31, 2011 Sales Returns and Allowances [Member] NBCUniversal Media, LLC [Member]	Dec. 31, 2013 Sales Returns and Allowances [Member] NBCUniversal Media, LLC [Member]	Dec. 31, 2012 Sales Returns and Allowances [Member] NBCUniversal Media, LLC [Member]	Dec. 31, 2013 Deferred Tax Valuation Allowance	Dec. 31, 2012 Deferred Tax Valuation Allowance	Dec. 31, 2011 Deferred Tax Valuation Allowance	Dec. 31, 2011 Deferred Tax Valuation Allowance NBCUniversal Media, LLC [Member]	Dec. 31, 2013 Deferred Tax Valuation Allowance NBCUniversal Media, LLC [Member]	Dec. 31, 2012 Deferred Tax Valuation Allowance NBCUniversal Media, LLC [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 198	$ 202	$ 173	$ 7	$ 46	$ 34	$ 307	$ 425	$ 0	$ 0	$ 307	$ 425	$ 355	$ 297	$ 207	$ 57	$ 73	$ 53
Additions Charged to Costs and Expenses	317	293	306	35	33	19	528	599	536	536	525	599	71	61	103	9	8	23
Deductions from Reserves	294	297	277	8	14	7	460	717	111	111	460	717	21	3	13	13	21	3
Balance at End of Year	$ 221	$ 198	$ 202	$ 34	$ 65	$ 46	$ 375	$ 307	$ 425	$ 425	$ 372	$ 307	$ 405	$ 355	$ 297	$ 53	$ 60	$ 73

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

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