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Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2020
Operating Loss Carryforwards [Line Items]
Discrete income tax expense (benefit)	$ 39	$ (152)	$ 5	$ (113)	$ (7)
Income tax expense (benefit)	40		6	(142)	6
Pre-tax net income (loss)	$ (3)		$ 5	$ (17)	$ (5)
Effective tax rate (percentage)	(1333.30%)		120.00%	835.30%	(120.00%)
Discrete tax benefit related to intra-entity asset transfer		$ 157
Discrete tax expense related to an uncertain tax position			$ 4
Scenario, Forecast
Operating Loss Carryforwards [Line Items]
Effective tax rate (percentage)						1000.00%

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