Property, Plant and Equipment, Net (Tables)

6 Months Ended

Jun. 30, 2017

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



		As of
	Depreciable	June 30,			December 31,
	Life	2017			2016
Regulated assets:
Utility generation, transmission and distribution systems	5-80 years	$	72,317		$	71,536
Interstate natural gas pipeline assets	3-80 years	6,969			6,942
		79,286			78,478
Accumulated depreciation and amortization		(24,029		)	(23,603		)
Regulated assets, net		55,257			54,875

Nonregulated assets:
Independent power plants	5-30 years	5,880			5,594
Other assets	3-30 years	1,164			1,002
		7,044			6,596
Accumulated depreciation and amortization		(1,222		)	(1,060		)
Nonregulated assets, net		5,822			5,536

Net operating assets		61,079			60,411
Construction work-in-progress		2,607			2,098
Property, plant and equipment, net		$	63,686		$	62,509

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



		As of
		June 30,			December 31,
	Depreciable Life	2017			2016
Utility plant in service, net:
Generation	20-70 years	$	11,308		$	11,282
Transmission	52-75 years	1,794			1,726
Electric distribution	20-75 years	3,260			3,197
Gas distribution	29-75 years	1,588			1,565
Utility plant in service		17,950			17,770
Accumulated depreciation and amortization		(5,660		)	(5,448		)
Utility plant in service, net		12,290			12,322
Nonregulated property, net:
Nonregulated property gross	20-50 years	7			7
Accumulated depreciation and amortization		(1		)	(1		)
Nonregulated property, net		6			6
		12,296			12,328
Construction work-in-progress		746			493
Property, plant and equipment, net		$	13,042		$	12,821

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



		As of
		June 30,			December 31,
	Depreciable Life	2017			2016

Property, plant and equipment in-service	5-75 years	$	27,505		$	27,298
Accumulated depreciation and amortization		(9,074		)	(8,793		)
Net property, plant and equipment in-service		18,431			18,505
Construction work-in-progress		710			657
Total property, plant and equipment, net		$	19,141		$	19,162

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



		As of
	Depreciable Life	June 30,			December 31,
	Depreciable Life	2017			2016
Utility plant:
Generation	30 - 55 years	$	3,741		$	4,271
Distribution	20 - 65 years	3,279			3,231
Transmission	45 - 65 years	1,861			1,846
General and intangible plant	5 - 65 years	773			738
Utility plant		9,654			10,086
Accumulated depreciation and amortization		(2,791		)	(3,205		)
Utility plant, net		6,863			6,881
Other non-regulated, net of accumulated depreciation and amortization	45 years	2			2
Plant, net		6,865			6,883
Construction work-in-progress		60			114
Property, plant and equipment, net		$	6,925		$	6,997

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



		As of
	Depreciable Life	June 30,			December 31,
	Depreciable Life	2017			2016
Utility plant:
Electric generation	25 - 60 years	$	1,140		$	1,137
Electric distribution	20 - 100 years	1,436			1,417
Electric transmission	50 - 100 years	774			771
Electric general and intangible plant	5 - 70 years	176			164
Natural gas distribution	35 - 70 years	385			381
Natural gas general and intangible plant	5 - 70 years	14			15
Common general	5 - 70 years	283			267
Utility plant		4,208			4,152
Accumulated depreciation and amortization		(1,479		)	(1,442		)
Utility plant, net		2,729			2,710
Other non-regulated, net of accumulated depreciation and amortization	70 years	5			5
Plant, net		2,734			2,715
Construction work-in-progress		107			107
Property, plant and equipment, net		$	2,841		$	2,822