Reconciliation of Current Period Changes, Net of Applicable Income Taxes, for Derivatives Qualifying as Hedges (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative Instruments [Abstract]
Beginning balance	$ 1,154	$ 1,445	$ 1,200	$ 2,025
Current period increases (decreases) in fair value, net of deferred taxes of $67, $12, $59 and $149	(390)	(98)	(359)	(604)
Reclassification to net (income), net of deferred taxes of $18, $21, $60 and $60	(37)	(37)	(114)	(111)
Ending balance	$ 727	$ 1,310	$ 727	$ 1,310