Property, Plant and Equipment, Net (Tables)

6 Months Ended

Jun. 30, 2018

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



		As of
	Depreciable	June 30,			December 31,
	Life	2018			2017
Regulated assets:
Utility generation, transmission and distribution systems	5-80 years	$	74,975		$	74,660
Interstate natural gas pipeline assets	3-80 years	7,240			7,176
		82,215			81,836
Accumulated depreciation and amortization		(25,155		)	(24,478		)
Regulated assets, net		57,060			57,358

Nonregulated assets:
Independent power plants	5-30 years	6,553			6,010
Other assets	3-30 years	1,589			1,489
		8,142			7,499
Accumulated depreciation and amortization		(1,697		)	(1,542		)
Nonregulated assets, net		6,445			5,957

Net operating assets		63,505			63,315
Construction work-in-progress		3,204			2,556
Property, plant and equipment, net		$	66,709		$	65,871

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



		As of
		June 30,			December 31,
	Depreciable Life	2018			2017
Utility plant in service, net:
Generation	20-70 years	$	12,102		$	12,107
Transmission	52-75 years	1,858			1,838
Electric distribution	20-75 years	3,463			3,380
Gas distribution	29-75 years	1,671			1,640
Utility plant in service		19,094			18,965
Accumulated depreciation and amortization		(5,731		)	(5,561		)
Utility plant in service, net		13,363			13,404
Nonregulated property, net:
Nonregulated property gross	20-50 years	7			7
Accumulated depreciation and amortization		(1		)	(1		)
Nonregulated property, net		6			6
		13,369			13,410
Construction work-in-progress		1,303			797
Property, plant and equipment, net		$	14,672		$	14,207

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



		As of
		June 30,			December 31,
	Depreciable Life	2018			2017
Utility Plant:
Utility plant in-service	5-75 years	$	28,106		$	27,880
Accumulated depreciation and amortization		(9,613		)	(9,366		)
Utility plant in-service, net		18,493			18,514
Other non-regulated, net of accumulated depreciation and amortization	45 years	11			11
Plant, net		18,504			18,525
Construction work-in-progress		788			678
Property, plant and equipment, net		$	19,292		$	19,203

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



		As of
	Depreciable Life	June 30,			December 31,
	Depreciable Life	2018			2017
Utility plant:
Generation	30 - 55 years	$	3,713		$	3,707
Distribution	20 - 65 years	3,352			3,314
Transmission	45 - 70 years	1,861			1,860
General and intangible plant	5 - 65 years	811			793
Utility plant		9,737			9,674
Accumulated depreciation and amortization		(2,984		)	(2,871		)
Utility plant, net		6,753			6,803
Other non-regulated, net of accumulated depreciation and amortization	45 years	1			1
Plant, net		6,754			6,804
Construction work-in-progress		80			73
Property, plant and equipment, net		$	6,834		$	6,877

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



		As of
	Depreciable Life	June 30,			December 31,
	Depreciable Life	2018			2017
Utility plant:
Electric generation	25 - 60 years	$	1,144		$	1,144
Electric distribution	20 - 100 years	1,506			1,459
Electric transmission	50 - 100 years	818			786
Electric general and intangible plant	5 - 70 years	190			181
Natural gas distribution	35 - 70 years	396			390
Natural gas general and intangible plant	5 - 70 years	14			14
Common general	5 - 70 years	303			294
Utility plant		4,371			4,268
Accumulated depreciation and amortization		(1,553		)	(1,513		)
Utility plant, net		2,818			2,755
Other non-regulated, net of accumulated depreciation and amortization	70 years	5			5
Plant, net		2,823			2,760
Construction work-in-progress		100			132
Property, plant and equipment, net		$	2,923		$	2,892