Provision for (Benefit from) Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current
Federal	$ (5)	$ (3)	$ (7)
State	21	41	36
Foreign	29	50	59
Current income tax provision (benefit)	45	88	88
Deferred
Federal	(104)	41	63
State	(90)	(37)	(39)
Foreign	(123)	(107)	(10)
Deferred income tax provision	(317)	(103)	14
Provision for (benefit from) income taxes	$ (272)	(15)	102
Provision adjustment due to corporate tax rate change [Member]
Deferred
Deferred income tax provision		$ 30	317
Provision adjustment due to anticipated repatriation of foreign earnings [Member]
Deferred
Deferred income tax provision			$ 104