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Variable Interest Entities (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |
Assets | $ 29,097 | $ 29,345 | $ 27,743
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Aggregate investment balance | 178 | 228 |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Assets | 117 | 114 |
Investment In Low Income Housing Properties [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity method investments debt balance | 156 | 210 |
Trust For Final Capping, Closure, Post-closure Or Environmental Remediation Obligations [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Aggregate investment balance | $ 110 | $ 106 |

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