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Segment Information (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Segment Financial Information
Revenues	[1]	$ 2,883	$ 2,862
Depreciation		297	277
Amortization (deferral) of regulatory assets, net		5	(148)
Miscellaneous income (expense), net		54	67
Interest expense		253	248
Income taxes		93	233
Income (loss) from continuing operations		355	181
Total assets		40,490	38,795	$ 40,063
Goodwill		5,618	5,618	$ 5,618
Property additions		554	583
External Customers
Segment Financial Information
Revenues		2,883	2,862
Internal Customers
Segment Financial Information
Revenues		0	0
Regulated Distribution
Segment Financial Information
Revenues		2,344	2,321
Regulated Transmission
Segment Financial Information
Revenues		352	319
Income (loss) from continuing operations		104	99
Operating Segments | Regulated Distribution
Segment Financial Information
Revenues		2,573	2,576
Depreciation		209	196
Amortization (deferral) of regulatory assets, net		3	(152)
Miscellaneous income (expense), net		46	56
Interest expense		122	128
Income taxes		89	93
Income (loss) from continuing operations		329	322
Total assets		28,992	27,504
Goodwill		5,004	5,004
Property additions		318	264
Operating Segments | Regulated Distribution | External Customers
Segment Financial Information
Revenues		2,526	2,538
Operating Segments | Regulated Distribution | Internal Customers
Segment Financial Information
Revenues		47	38
Operating Segments | Regulated Transmission
Segment Financial Information
Revenues		356	323
Depreciation		69	61
Amortization (deferral) of regulatory assets, net		2	4
Miscellaneous income (expense), net		4	4
Interest expense		45	39
Income taxes		31	32
Total assets		10,910	9,681
Goodwill		614	614
Property additions		231	292
Operating Segments | Regulated Transmission | External Customers
Segment Financial Information
Revenues		352	319
Operating Segments | Regulated Transmission | Internal Customers
Segment Financial Information
Revenues		4	4
Corporate/Other
Segment Financial Information
Revenues		5	11
Depreciation		2	2
Amortization (deferral) of regulatory assets, net		0	0
Miscellaneous income (expense), net		11	16
Interest expense		93	90
Income taxes		(27)	108
Income (loss) from continuing operations		(78)	(240)
Total assets		588	1,255
Goodwill		0	0
Property additions		5	11
Corporate/Other | External Customers
Segment Financial Information
Revenues		5	5
Corporate/Other | Internal Customers
Segment Financial Information
Revenues		0	6
Reconciling Adjustments
Segment Financial Information
Revenues		(51)	(48)
Depreciation		17	18
Amortization (deferral) of regulatory assets, net		0	0
Miscellaneous income (expense), net		(7)	(9)
Interest expense		(7)	(9)
Income taxes		0	0
Income (loss) from continuing operations		0	0
Total assets		0	355
Goodwill		0	0
Property additions		0	16
Reconciling Adjustments | External Customers
Segment Financial Information
Revenues		0	0
Reconciling Adjustments | Internal Customers
Segment Financial Information
Revenues		$ (51)	$ (48)
[1] Includes excise and gross receipts tax collections of $102 million in the three months ended March 31, 2019 and 2018

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