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Property, Plant and Equipment (Components of PP&E) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Property, Plant and Equipment [Line Items] |  |
Electric generation, distribution assets and other | $ 25,552 | $ 26,707
Accumulated depreciation | (8,486) | (8,472)
Property, Plant and Equipment, Net | 17,066 | 18,235
Electric generation and distribution facilities |  |
Property, Plant and Equipment [Line Items] |  |
Electric generation, distribution assets and other | $ 22,909 | 24,239
Electric generation and distribution facilities | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 5 years |
Electric generation and distribution facilities | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 39 years |
Other buildings |  |
Property, Plant and Equipment [Line Items] |  |
Electric generation, distribution assets and other | $ 1,552 | 1,507
Other buildings | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 5 years |
Other buildings | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 51 years |
Furniture and Fixtures [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Electric generation, distribution assets and other | $ 356 | 333
Furniture and Fixtures [Member] | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 3 years |
Furniture and Fixtures [Member] | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 30 years |
Other |  |
Property, Plant and Equipment [Line Items] |  |
Electric generation, distribution assets and other | $ 735 | $ 628
Other | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 1 year |
Other | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 39 years |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount before accumulated depreciation, depletion and amortization of other physical assets used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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