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Variable Interest Entities (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |
Assets | $ 27,743 | $ 22,650 | $ 21,829
Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Assets | 109 | 103 |
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Aggregate investment balance | 309 | 189 |
Investment In Low Income Housing Properties [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity method investments debt balance | 269 | 151 |
Trust For Final Capping, Closure, Post-closure Or Environmental Remediation Obligations [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Value of unconsolidated VIEs | $ 101 | $ 92 |

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