Discontinued Operations - Effect on Statements of Operations of Discontinued Operations (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Stock-based compensation expense		$ 79	$ 43	$ 43
Discontinued Operations [Member] | Social and Mobile Games [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Stock-based compensation expense				264
Discontinued Operations, Disposed of by Sale [Member] | Discontinued Operations [Member] | Social and Mobile Games [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues				678
Operating expenses	[1]			748
Gain from discontinued operations				4,180
Pre-tax income/(loss) from operations				4,110
Income/(loss), net of income taxes				$ 3,380

[1] (1)  Operating expenses primarily consist of platform fees and property, general, administrative, and other expenses, including stock-based compensation expense directly identifiable with employees of the SMG Business of $264 million