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Variable Interest Entities (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Variable Interest Entity |  |
Aggregate investment balance | $ 538 | $ 460
Carrying value of debt | 16,229 | 14,984
Assets | 32,823 | 31,367
Variable Interest Entity, Primary Beneficiary [Member] |  |
Variable Interest Entity |  |
Assets | 119 | 113
Low income housing investments [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entity |  |
Aggregate investment balance | 458 | 321
Carrying value of debt | 408 | 295
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 | $ 104 | $ 93

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