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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

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