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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 $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($)
Operating Activities |
Depreciation and amortization | $ 82
Deferred income taxes | 53
Equity earnings of equity method investees | (59)
Asset (gains) losses and impairments, net | 19
Investing Activities |
Plant and equipment expenditures — non-utility | $ (60)

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