Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of contingent rental revenue recognized for the period under lease, based on the occurrences of an event or condition.

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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.

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Period end amount of property, plant and equipment (PPE) related to generation or processing owned by public utility.

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Property, Plant and Equipment (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Asset Impairment Charges	$ 402	$ 282	$ 18
Commercial Renewables [Member]
Property, Plant and Equipment [Line Items]
Asset Impairment Charges			71
Property, Plant and Equipment [Member]
Property, Plant and Equipment [Line Items]
Asset Impairment Charges	58
Finite-Lived Intangible Assets [Member]
Property, Plant and Equipment [Line Items]
Asset Impairment Charges	11
Assets Leased to Others [Member] \| Commercial Renewables [Member]
Property, Plant and Equipment [Line Items]
Contingent lease payments	268	$ 262	$ 216
Renewable energy projects	3,358
Accumulated depreciation and amortization	(602)
Wind Project [Member]
Property, Plant and Equipment [Line Items]
Asset Impairment Charges	$ 69