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Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment
Total property, plant and equipment	$ 4,859	$ 8,229
Accumulated depreciation	(1,811)	(2,255)
Net property, plant, and equipment	3,048	5,974
Facilities and equipment
Property, Plant and Equipment
Total property, plant and equipment	$ 3,763	6,904
Facilities and equipment | Minimum
Property, Plant and Equipment
Depreciable lives (in years)	1 year
Facilities and equipment | Maximum
Property, Plant and Equipment
Depreciable lives (in years)	40 years
Land and improvements
Property, Plant and Equipment
Total property, plant and equipment	$ 347	468
Nuclear fuel
Property, Plant and Equipment
Total property, plant and equipment	$ 212	235
Depreciable lives (in years)	5 years
Office furnishings and equipment
Property, Plant and Equipment
Total property, plant and equipment	$ 431	421
Office furnishings and equipment | Minimum
Property, Plant and Equipment
Depreciable lives (in years)	2 years
Office furnishings and equipment | Maximum
Property, Plant and Equipment
Depreciable lives (in years)	10 years
Construction in progress
Property, Plant and Equipment
Total property, plant and equipment	$ 106	$ 201

X

- Definition

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

+ References

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business 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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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.

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