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Additional Financial Information - Components of Other Non-Current Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Jul. 01, 2018
Jun. 30, 2018
Assets, Noncurrent [Abstract]      
Royalty advances to authors $ 326   $ 312
Retirement benefit assets 145   135
Inventory 144   143
Other 297   241
Total Other non-current assets $ 912 $ 923 $ 831