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Variable Interest Entities (Detail) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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Variable Interest Entity, Not Primary Beneficiary [Member] | Other Receivables Investments in Unconsolidated Entities and Other Assets [Member] |  |
Variable Interest Entity [Line Items] |  |
Aggregate investment balance | $ 97 | $ 92
Investments Qualifying for Federal Tax Credits [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Aggregate investment balance | 321 | 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 | 278 | 151
Trust For Final Capping, Closure, Post-closure Or Environmental Remediation Obligations [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Long-term other assets [Member] |  |
Variable Interest Entity [Line Items] |  |
Value of consolidated VIEs | $ 108 | $ 103

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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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