Other Income and Expense (Nonoperating Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain	$ 178	$ 36	$ 214
Other Income [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain				$ 0	$ 5	$ 254
Litigation Settlement, Amount Awarded from Other Party				4	6	53
Asset Acquisition of a VIE, Contingent Consideration, Remeasurement Gain				16	3	28
Gain (Loss) on Disposition of Other Assets				19	0	24
Gain on pension curtailment				0	0	11
Non-service pension income				0	5	10
Gain on acquired customer contracts				0	5	0
Public Utilities, Allowance for Funds Used During Construction, Additions				14	10	8
liquidated damages power sales				0	10	0
Insured Event, Gain (Loss)				6	12	0
Investment Income, Dividend				6	3	1
Other				24	21	21
Other income				89	102	410
Gain on remeasurement of Investment				0	22	0
Other Expense [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cost of Disposition of Business Interest				0	15	0
Gain (Loss) on Disposition of Assets				49	13	14
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)				$ 12	$ 0	$ 0