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Discontinued Operations (Significant Non-cash Items, Capital Expenditures, and Significant Financing Activities of Discontinued Operations) (Details) - DT Midstream - Discontinued operations, spinoff - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Operating Activities |  |
Depreciation and amortization | $ 82 | $ 151
Deferred income taxes | 53 | 125
Equity earnings of equity method investees | (59) | (106)
Asset (gains) losses and impairments, net | 19 | (2)
Investing Activities |  |
Plant and equipment expenditures — non-utility | (60) | (517)
Financing Activities |  |
Acquisition related deferred payment, excluding accretion | $ 0 | $ (380)

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- Definition Amount of deprecation and amortization expense attributable to property, plant and equipment and intangible assets of discontinued operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760 + Details
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