Reconciliation of Current Period Changes, Net of Applicable Income Taxes, for Derivatives Qualifying as Hedges (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Derivative Instruments [Abstract]
Beginning balance	$ 1,274	$ 1,789	$ 1,200	$ 2,025
Current period increases (decreases) in fair value, net of deferred taxes of $23, $84, $(8) and $137	(83)	(307)	31	(506)
Reclassification to net (income), net of deferred taxes of $21, $19, $42 and $39	(37)	(37)	(77)	(74)
Ending balance	$ 1,154	$ 1,445	$ 1,154	$ 1,445