Property, Plant and Equipment, Net (Tables)

3 Months Ended

Mar. 31, 2018

Property, plant and equipment, net consists of the following (in millions):



		As of
	Depreciable	March 31,			December 31,
	Life	2018			2017
Regulated assets:
Utility generation, transmission and distribution systems	5-80 years	$	75,068		$	74,660
Interstate natural gas pipeline assets	3-80 years	7,230			7,176
		82,298			81,836
Accumulated depreciation and amortization		(24,957		)	(24,478		)
Regulated assets, net		57,341			57,358

Nonregulated assets:
Independent power plants	5-30 years	6,034			6,010
Other assets	3-30 years	1,588			1,489
		7,622			7,499
Accumulated depreciation and amortization		(1,644		)	(1,542		)
Nonregulated assets, net		5,978			5,957

Net operating assets		63,319			63,315
Construction work-in-progress		2,735			2,556
Property, plant and equipment, net		$	66,054		$	65,871

Property, plant and equipment, net consists of the following (in millions):



		As of
		March 31,			December 31,
	Depreciable Life	2018			2017
Utility plant in service, net:
Generation	20-70 years	$	12,108		$	12,107
Transmission	52-75 years	1,844			1,838
Electric distribution	20-75 years	3,418			3,380
Gas distribution	29-75 years	1,652			1,640
Utility plant in service		19,022			18,965
Accumulated depreciation and amortization		(5,670		)	(5,561		)
Utility plant in service, net		13,352			13,404
Nonregulated property, net:
Nonregulated property gross	20-50 years	7			7
Accumulated depreciation and amortization		(1		)	(1		)
Nonregulated property, net		6			6
		13,358			13,410
Construction work-in-progress		910			797
Property, plant and equipment, net		$	14,268		$	14,207

Property, plant and equipment, net consists of the following (in millions):



		As of
		March 31,			December 31,
	Depreciable Life	2018			2017
Utility Plant:
Utility plant in-service	5-75 years	$	27,947		$	27,880
Accumulated depreciation and amortization		(9,503		)	(9,366		)
Utility plant in-service, net		18,444			18,514
Other non-regulated, net of accumulated depreciation and amortization	45 years	11			11
Plant, net		18,455			18,525
Construction work-in-progress		735			678
Property, plant and equipment, net		$	19,190		$	19,203

Property, plant and equipment, net consists of the following (in millions):



		As of
	Depreciable Life	March 31,			December 31,
	Depreciable Life	2018			2017
Utility plant:
Generation	30 - 55 years	$	3,707		$	3,707
Distribution	20 - 65 years	3,329			3,314
Transmission	45 - 70 years	1,864			1,860
General and intangible plant	5 - 65 years	805			793
Utility plant		9,705			9,674
Accumulated depreciation and amortization		(2,930		)	(2,871		)
Utility plant, net		6,775			6,803
Other non-regulated, net of accumulated depreciation and amortization	45 years	2			1
Plant, net		6,777			6,804
Construction work-in-progress		78			73
Property, plant and equipment, net		$	6,855		$	6,877

Property, plant and equipment, net consists of the following (in millions):



		As of
	Depreciable Life	March 31,			December 31,
	Depreciable Life	2018			2017
Utility plant:
Electric generation	25 - 60 years	$	1,143		$	1,144
Electric distribution	20 - 100 years	1,470			1,459
Electric transmission	50 - 100 years	791			786
Electric general and intangible plant	5 - 70 years	181			181
Natural gas distribution	35 - 70 years	390			390
Natural gas general and intangible plant	5 - 70 years	14			14
Common general	5 - 70 years	296			294
Utility plant		4,285			4,268
Accumulated depreciation and amortization		(1,531		)	(1,513		)
Utility plant, net		2,754			2,755
Other non-regulated, net of accumulated depreciation and amortization	70 years	5			5
Plant, net		2,759			2,760
Construction work-in-progress		142			132
Property, plant and equipment, net		$	2,901		$	2,892