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Variable Interest Entities (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Variable Interest Entity [Line Items] |  |  |
Assets |  | $ 26,619 | $ 27,743
Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Assets |  | 110 | 109
Refined Coal Facility [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity method investments impairment charges | $ 7 | 7 |
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Aggregate investment balance |  | 99 | 101
Variable Interest Entity, Not Primary Beneficiary [Member] | Investments Qualifying for Federal Tax Credits [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Aggregate investment balance |  | 260 | 309
Variable Interest Entity, Not Primary Beneficiary [Member] | Investment In Low Income Housing Properties [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity method investments debt balance |  | $ 240 | $ 269

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