Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, plant and equipment consists of the following at December 31:

	2019			2018			Range of Useful Lives (in years)
	(millions)
Power-generation assets(a)	$	6,553		$	6,262		3 - 35
Pipeline assets, including temporary rights-of-way	813			810			25 - 50
Land improvements and buildings	385			362			7 - 35
Land, including perpetual rights-of-way	60			60
Construction work in progress	80			5
Other depreciable assets	279			237			3 - 35
Property, plant and equipment, gross	8,170			7,736
Accumulated depreciation	(1,200		)	(966		)
Property, plant and equipment - net	$	6,970		$	6,770

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(a)

Approximately 87% of power generation assets represent machinery and equipment used to generate electricity with a 35-year depreciable life.