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%

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan and expenses resulting from the write-down of assets. Excludes expenses related to a business combination, a discontinued operation or an asset retirement obligation.

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