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Selected Quarterly Financial Data (Unaudited) - Selected Quarterly Financial Data (Parenthetical) (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Selected Quarterly Financial Information [Line Items]          
Goodwill impairment $ 11,000 $ 6,100 $ 3,027 $ 17,100 $ 900