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Property, Plant and Equipment (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Property, Plant and Equipment [Line Items] |  |
Charges related to reduction in physical workspace | $ 192 |
Net property, plant and equipment | 111,408 | $ 106,782
Impairment of assets and other charges |  |
Property, Plant and Equipment [Line Items] |  |
Charges related to reduction in physical workspace | 133 |
Operation, maintenance and other |  |
Property, Plant and Equipment [Line Items] |  |
Charges related to reduction in physical workspace | 42 |
Depreciation and amortization |  |
Property, Plant and Equipment [Line Items] |  |
Charges related to reduction in physical workspace | 17 |
Renewable merchant plants |  |
Property, Plant and Equipment [Line Items] |  |
Net property, plant and equipment | $ 200 |
Ownership interest | 51.00% |

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