Variable Interest Entities (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Variable Interest Entity
Aggregate investment balance	$ 86	$ 538
Investments qualifying for proportional amortization method	707
Carrying value of debt	23,900	16,229
Assets	44,567	32,823
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity
Assets	128	119
Low income housing investments [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity
Aggregate investment balance	707	458
Carrying value of debt	670	408
Trust For Final Capping, Closure, Post-closure Or Environmental Remediation Obligations [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity
Aggregate investment balance	$ 111	$ 104