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Variable Interest Entities (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Variable Interest Entity [Line Items] |  |  |
Carrying value of debt |  | $ 10,422 | $ 13,498
Assets |  | 24,772 | 27,743
Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Assets |  | 112 | 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 |  |
Investments Qualifying for Federal Tax Credits [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Aggregate investment balance |  | 243 | 309
Investment In Low Income Housing Properties [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Carrying value of debt |  | 226 | 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 |  | $ 101 | $ 101

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