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Variable Interest Entities (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Variable Interest Entity [Line Items] |  |
Assets | $ 27,178 | $ 27,743
Variable Interest Entity, Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Assets | 109 | 109
Refined Coal Facility [Member] |  |
Variable Interest Entity [Line Items] |  |
Equity method investments impairment charges | 7 |
Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Aggregate investment balance | 285 | 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 | 256 | 269
Variable Interest Entity, Not Primary Beneficiary [Member] | Trust For Final Capping, Closure, Post-closure Or Environmental Remediation Obligations [Member] |  |
Variable Interest Entity [Line Items] |  |
Value of unconsolidated VIEs | $ 94 | $ 101

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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