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Revenue (Details) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018 USD ($) company MW	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) company MW	Jun. 30, 2017 USD ($)
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		$ 2,629		$ 5,521
ARP		60		124
Other non-customer revenue		15		35
Total revenues(1)	[1]	2,704	$ 2,624	5,680	$ 5,479
Regulated Transmission		341	327	664	640
Distribution services | Customer
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		1,185		2,454
Retail generation | Customer
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		868		1,894
Wholesale sales | Customer
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		205		448
Transmission | Customer
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		336		655
Other | Customer
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		35		70
Derivative Revenue | Other Non-Customer Revenue
Disaggregation of Revenue [Line Items]
Total revenues(1)		4		14
Regulated Distribution
Disaggregation of Revenue [Line Items]
Total revenues(1)		2,110		4,431
Reduction in revenue		$ 10		$ 82
Number of existing utility operating companies | company		10		10
Megawatts of net demonstrated capacity of competitive segment | MW		3,790		3,790
Utility customer payment period				30 days
Regulated Distribution | Residential
Disaggregation of Revenue [Line Items]
Total revenues(1)		$ 1,255		$ 2,718
Regulated Distribution | Commercial
Disaggregation of Revenue [Line Items]
Total revenues(1)		570		1,150
Regulated Distribution | Industrial
Disaggregation of Revenue [Line Items]
Total revenues(1)		262		516
Regulated Distribution | Other
Disaggregation of Revenue [Line Items]
Total revenues(1)		23		47
Regulated Transmission
Disaggregation of Revenue [Line Items]
Reduction in revenue				2
Recovery of revenue		2
Regulated Transmission		336		655
Regulated Transmission | JCP&L | FERC
Disaggregation of Revenue [Line Items]
Annual revenue requirement				155
Regulated Transmission | ATSI
Disaggregation of Revenue [Line Items]
Regulated Transmission		167		325
Regulated Transmission | TrAIL
Disaggregation of Revenue [Line Items]
Regulated Transmission		63		123
Regulated Transmission | MAIT
Disaggregation of Revenue [Line Items]
Regulated Transmission		34		64
Regulated Transmission | Other
Disaggregation of Revenue [Line Items]
Regulated Transmission		72		143
Operating Segments | Customer
Disaggregation of Revenue [Line Items]
Reduction in revenue		8		84
Operating Segments | Regulated Distribution
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		2,266		4,745
ARP		60		124
Other non-customer revenue		26		59
Total revenues(1)		2,352	2,271	4,928	4,771
Operating Segments | Regulated Distribution | Distribution services | Customer
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		1,228		2,509
Operating Segments | Regulated Distribution | Retail generation | Customer
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		882		1,922
Operating Segments | Regulated Distribution | Wholesale sales | Customer
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		121		244
Operating Segments | Regulated Distribution | Transmission | Customer
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		0		0
Operating Segments | Regulated Distribution | Other | Customer
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		35		70
Operating Segments | Regulated Transmission
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		336		655
ARP		0		0
Other non-customer revenue		5		9
Total revenues(1)		341	$ 327	664	$ 640
Operating Segments | Regulated Transmission | Distribution services | Customer
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		0		0
Operating Segments | Regulated Transmission | Retail generation | Customer
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		0		0
Operating Segments | Regulated Transmission | Wholesale sales | Customer
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		0		0
Operating Segments | Regulated Transmission | Transmission | Customer
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		336		655
Operating Segments | Regulated Transmission | Other | Customer
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		0		0
Corporate/Other and Reconciling Adjustments
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		27		121
ARP		0		0
Other non-customer revenue		(16)		(33)
Total revenues(1)		11		88
Corporate/Other and Reconciling Adjustments | Distribution services | Customer
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		(43)		(55)
Corporate/Other and Reconciling Adjustments | Retail generation | Customer
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		(14)		(28)
Corporate/Other and Reconciling Adjustments | Wholesale sales | Customer
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		84		204
Corporate/Other and Reconciling Adjustments | Transmission | Customer
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		0		$ 0
Corporate/Other and Reconciling Adjustments | Other | Customer
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers		$ 0
[1] Includes excise tax collections of $87 million and $91 million in the three months ended June 30, 2018 and 2017, respectively, and $189 million and $191 million in the six months ended June 30, 2018 and 2017, respectively.

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