Income Taxes (Narrative) (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)
Income Taxes [Line Items]
Effective Income Tax Rate, Federal and State Statutory Income Tax Rate, Percent	28.11%
NJ surcharge tax percent for 2018 to 2019	2.50%
NJ tax surcharge percent for 2020 to 2021	1.50%
Minimum [Member]
Income Taxes [Line Items]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	$ 130
Maximum [Member]
Income Taxes [Line Items]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	$ 190