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Content Rights (Schedule Of Content Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Content Rights [Abstract]        
Content amortization $ 446 $ 420 $ 901 $ 855
Other production charges 76 79 141 138
Content Impairments 6 3 9 9
Total content expense $ 528 $ 502 $ 1,051 $ 1,002