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Variable Interest Entities (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Variable Interest Entity
Aggregate investment balance	$ 460	$ 335
Carrying value of debt	14,984	13,405
Assets	31,367	29,097	$ 29,345
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity
Assets	113	117
Low income housing investments [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity
Aggregate investment balance	321	178
Carrying value of debt	295	156
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	$ 93	$ 110

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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