Segment and Related Information (Income Statement and Balance Sheet Data) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement Data
Operating Revenues from external customers	$ 7,902	$ 5,783	$ 5,474
Depreciation	1,181	1,082	1,022
Amortization	52	39	58
Interest Expense	513	918	634
Income Before Income Taxes	915	521	954
Income Taxes	201	503	314
Deferred income taxes and investment tax credits	179	87	169
Net income (loss)	756	(1,480)	1,469
Cash Flow Data
Expenditures for long-lived assets	2,158	1,979	2,278
Balance Sheet Data
Total Assets	37,837	33,223
Kentucky Regulated [Member]
Income Statement Data
Operating Revenues from external customers	3,811	3,348	3,106
Depreciation	685	647	606
Amortization	23	15	19
Interest Expense	262	249	300
Income Before Income Taxes	621	562	516
Income Taxes	114	94	98
Deferred income taxes and investment tax credits	6	272	64
Net income (loss)	507	468	418
Cash Flow Data
Expenditures for long-lived assets	917	1,026	966
Balance Sheet Data
Total Assets	16,904	16,360
Segment Information (Numeric) [Abstract]
Financing Costs Allocated to Segment, Net of Tax			32
Income Taxes Allocated to Segment			8
Pennsylvania Regulated [Member]
Income Statement Data
Operating Revenues from external customers	3,030	2,402	2,330
Depreciation	393	424	403
Amortization	22	19	26
Interest Expense	171	162	172
Income Before Income Taxes	699	599	664
Income Taxes	174	154	167
Deferred income taxes and investment tax credits	91	79	82
Net income (loss)	525	445	497
Cash Flow Data
Expenditures for long-lived assets	889	904	1,154
Balance Sheet Data
Total Assets	13,565	13,336
Corporate And Other [Member]
Income Statement Data
Operating Revenues from external customers	23	33	38
Depreciation	11	11	13
Amortization	5	5	13
Interest Expense	41	507	162
Income Before Income Taxes	(347)	(640)	(226)
Income Taxes	(73)	255	49
Deferred income taxes and investment tax credits	43	(264)	23
Net income (loss)	(274)	(895)	(275)
Cash Flow Data
Expenditures for long-lived assets	84	49	158
Balance Sheet Data
Total Assets	1,287	3,527
Discontinued Operations Segment
Income Statement Data
Net income (loss)	42	(1,498)	829
Rhode Island Regulated
Income Statement Data
Operating Revenues from external customers	1,038	0	0
Depreciation	92	0	0
Amortization	2	0	0
Interest Expense	39	0	0
Income Before Income Taxes	(58)	0	0
Income Taxes	(14)	0	0
Deferred income taxes and investment tax credits	39	0	0
Net income (loss)	(44)	0	0
Cash Flow Data
Expenditures for long-lived assets	268	0	$ 0
Balance Sheet Data
Total Assets	$ 6,081	$ 0