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Quarterly Information (Unaudited) (Parenthetical) (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Quarterly Financial Information [Line Items]
TCJA, adjustment to provisional net charge for income taxes		$ 157		$ 157
Provision (benefit) for income taxes			$ 8,755	4,448	$ 19,903
Transfer of Intangible Properties
Quarterly Financial Information [Line Items]
Provision (benefit) for income taxes	$ (2,600)			(2,600)
Increase (decrease) in net income				$ 2,400
Decrease (increase) in diluted earnings per share	$ (0.34)	$ 0.02		$ (0.31)

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of income tax expense (benefit) for measurement period adjustment from accounting for tax effect pursuant to Tax Cuts and Jobs Act.

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