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Other Income (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Consolidation, Eliminations [Member]
Dec. 31, 2012
Consolidation, Eliminations [Member]
Dec. 31, 2011
Consolidation, Eliminations [Member]
Dec. 31, 2012
NBCU LLC [Member]
Dec. 31, 2011
NBCU LLC [Member]
Dec. 31, 2013
NBCU LLC [Member]
Mar. 19, 2013
NBCU LLC [Member]
Jan. 28, 2011
NBCU LLC [Member]
Dec. 31, 2013
Associated Companies [Member]
Dec. 31, 2012
Associated Companies [Member]
Dec. 31, 2011
Associated Companies [Member]
Dec. 31, 2013
Licensing And Royalty Income [Member]
Dec. 31, 2012
Licensing And Royalty Income [Member]
Dec. 31, 2011
Licensing And Royalty Income [Member]
Dec. 31, 2013
Purchases And Sales Of Business Interests [Member]
Dec. 31, 2012
Purchases And Sales Of Business Interests [Member]
Dec. 31, 2011
Purchases And Sales Of Business Interests [Member]
Dec. 31, 2013
Interest Income From Finance Subsidiary [Member]
Dec. 31, 2012
Interest Income From Finance Subsidiary [Member]
Dec. 31, 2011
Interest Income From Finance Subsidiary [Member]
Dec. 31, 2013
Marketable Securities And Bank Deposits [Member]
Dec. 31, 2012
Marketable Securities And Bank Deposits [Member]
Dec. 31, 2011
Marketable Securities And Bank Deposits [Member]
Dec. 31, 2013
Other Items [Member]
Dec. 31, 2012
Other Items [Member]
Dec. 31, 2011
Other Items [Member]
Dec. 31, 2013
Other Income Including Eliminations [Member]
Dec. 31, 2012
Other Income Including Eliminations [Member]
Dec. 31, 2011
Other Income Including Eliminations [Member]
Component of Other Income, Nonoperating                                                                
Other income $ 3,108 $ 2,563 $ 5,063 $ 222 $ (94) $ (205)           $ 40 $ 1,545 $ 894 $ 320 $ 290 $ 304 $ 1,777 $ 574 $ 3,804 $ 21 $ 114 $ 206 $ 54 $ 38 $ 52 $ 674 $ 96 $ 8 $ 2,886 $ 2,657 $ 5,268
Income (Loss) from Equity Method Investments             1,416 789                                                
Pre Tax Gain On Sale Of Business                   1,096 3,705                                          
Gain On Sale Of Business Net Of Tax                   825 526                                          
Gain (Loss) on Sale of Assets and Asset Impairment Charges $ 330                                                              
Ownership Percentage In Newly Formed Entity                 49.00%   49.00%