Federal, State and Local Taxes - Changes in Liability for Unrecognized Gross Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Uncertain tax positions at beginning of year	$ 38	$ 36	$ 33
Additions for tax positions relating to current-year operations	2	1	1
Additions for tax positions relating to prior tax years	1	1	2
Subtractions for tax positions relating to prior tax years	(2)
Uncertain tax positions at end of year	$ 39	$ 38	$ 36