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Segment Information - Financial Data (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Segment Financial Information
Revenues	[1]	$ 2,709	$ 2,883
Depreciation		317	297
Amortization of regulatory assets, net		52	5
Miscellaneous income (expense), net		100	54
Interest expense		263	253
Income taxes (benefits)		(60)	93
Income (loss) from continuing operations		24	355
Property additions		616	554
Total assets		42,090		$ 42,301
Goodwill		5,618		5,618
External Customers
Segment Financial Information
Revenues		2,709	2,883
Internal Customers
Segment Financial Information
Revenues		0	0
Regulated Distribution
Segment Financial Information
Revenues		2,160	2,344
Regulated Transmission
Segment Financial Information
Revenues		397	352
Operating Segments | Regulated Distribution
Segment Financial Information
Revenues		2,358	2,573
Depreciation		223	209
Amortization of regulatory assets, net		49	3
Miscellaneous income (expense), net		75	46
Interest expense		127	122
Income taxes (benefits)		(32)	89
Income (loss) from continuing operations		136	329
Property additions		338	318
Total assets		29,642		29,642
Goodwill		5,004		5,004
Operating Segments | Regulated Distribution | External Customers
Segment Financial Information
Revenues		2,311	2,526
Operating Segments | Regulated Distribution | Internal Customers
Segment Financial Information
Revenues		47	47
Operating Segments | Regulated Transmission
Segment Financial Information
Revenues		401	356
Depreciation		76	69
Amortization of regulatory assets, net		3	2
Miscellaneous income (expense), net		6	4
Interest expense		52	45
Income taxes (benefits)		34	31
Income (loss) from continuing operations		117	104
Property additions		269	231
Total assets		11,753		11,611
Goodwill		614		614
Operating Segments | Regulated Transmission | External Customers
Segment Financial Information
Revenues		397	352
Operating Segments | Regulated Transmission | Internal Customers
Segment Financial Information
Revenues		4	4
Corporate/Other
Segment Financial Information
Revenues		1	5
Depreciation		2	2
Amortization of regulatory assets, net		0	0
Miscellaneous income (expense), net		25	11
Interest expense		90	93
Income taxes (benefits)		(62)	(27)
Income (loss) from continuing operations		(229)	(78)
Property additions		9	5
Total assets		695		1,015
Goodwill		0		0
Corporate/Other | External Customers
Segment Financial Information
Revenues		1	5
Corporate/Other | Internal Customers
Segment Financial Information
Revenues		0	0
Reconciling Adjustments
Segment Financial Information
Revenues		(51)	(51)
Depreciation		16	17
Amortization of regulatory assets, net		0	0
Miscellaneous income (expense), net		(6)	(7)
Interest expense		(6)	(7)
Income taxes (benefits)		0	0
Income (loss) from continuing operations		0	0
Property additions		0	0
Total assets		0		33
Goodwill		0		$ 0
Reconciling Adjustments | External Customers
Segment Financial Information
Revenues		0	0
Reconciling Adjustments | Internal Customers
Segment Financial Information
Revenues		$ (51)	$ (51)
[1] Includes excise and gross receipts tax collections of $92 million and $102 million during the three months ended March 31, 2020 and 2019, respectively.

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