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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Derivative Instruments [Abstract]
Derivatives qualifying as effective accounting hedges, beginning of period	$ 1,789	$ 1,792	$ 2,025	$ 2,211
Current period increases (decreases) in fair value, net of deferred taxes	(307)	245	(506)	(140)
Reclassification to net (income), net of deferred taxes	(37)	(34)	(74)	(68)
Derivatives qualifying as effective accounting hedges, end of period	$ 1,445	$ 2,003	$ 1,445	$ 2,003