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Variable Interest Entities (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Variable Interest Entity [Line Items] |  |  |  |
Carrying value of debt |  | $ 13,810 | $ 13,498 |
Assets |  | 29,345 | 27,743 | $ 22,650
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Aggregate investment balance |  | 228 | 309 |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Assets |  | 114 | 109 |
Refined Coal Facility [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Equity method investments impairment charges | $ 7 | 7 |  |
Refined Coal Facility [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Equity method investments impairment charges | $ 7 |  |  |
Investment In Low Income Housing Properties [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Equity method investments debt balance |  | 210 | 269 |
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 |  | $ 106 | $ 101 |

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