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Intangible Assets - Additional Information (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Disclosure of detailed information about intangible assets [line items]    
Additional recognition, goodwill $ 14 $ 307
Intangible assets other than goodwill [member]    
Disclosure of detailed information about intangible assets [line items]    
Assets classified as assets held for sale $ 150 $ 0