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Consolidated Statement of Changes in Equity (USD $)
In Millions
Total
Redeemable Noncontrolling Interests [Member]
Class A Common Stock [Member]
ClassA Special Common Stock [Member]
Class B Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Treasury Stock at Cost [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Noncontrolling Interests [Member]
Beginning Balance at Dec. 31, 2010 $ 44,434 $ 143 $ 24 $ 8 $ 0 $ 39,780 $ 12,158 $ (7,517) $ (99) $ 80
Stock compensation plans 276   1     310 (35)      
Repurchase and retirement of common stock (1,050)     (1)   (514) (535)      
Employee stock purchase plan 33         33        
Dividends declared (621)           (621)      
Other comprehensive income (loss) (6)               (6)  
NBCUniversal transaction 1,880 15,166       1,692       188
Contributions from (distributions to) noncontrolling interests (85) (162)               (85)
Net income (loss) 2,044 362         1,965     79
Ending Balance at Jun. 30, 2011 46,905 15,509 25 7 0 41,301 12,932 (7,517) (105) 262
Beginning Balance at Dec. 31, 2011 47,655 16,014 25 7 0 40,940 13,971 (7,517) (152) 381
Stock compensation plans 234         361 (127)      
Repurchase and retirement of common stock (1,500)     (1)   (583) (916)      
Employee stock purchase plan 41         41        
Dividends declared (874)           (874)      
Other comprehensive income (loss) (18) (8)             (18)  
Contributions from (distributions to) noncontrolling interests (85) (132)               (85)
Other 95 (44)       2       93
Net income (loss) 2,631 449         2,572     59
Ending Balance at Jun. 30, 2012 $ 48,179 $ 16,279 $ 25 $ 6 $ 0 $ 40,761 $ 14,626 $ (7,517) $ (170) $ 448