Commitments (Long-Term Purchase Commitments) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Electricity Purchase Contracts
Long-Term Purchase Commitment [Line Items]
Purchases Under Long Term Contracts	$ 1,134	$ 1,156	$ 709
Purchase Obligation, Due in Next Twelve Months	1,222
Purchase Obligation, Due in Second Year	962
Purchase Obligation, Due in Third Year	700
Purchase Obligation, Due in Fourth Year	686
Purchase Obligation, Due in Fifth Year	656
Future Commitments Thereafter	5,873
Future Commitments Total	10,099
Fuel Purchase Contracts
Long-Term Purchase Commitment [Line Items]
Purchases Under Long Term Contracts	1,982	3,375	2,070
Purchase Obligation, Due in Next Twelve Months	2,069
Purchase Obligation, Due in Second Year	1,678
Purchase Obligation, Due in Third Year	1,166
Purchase Obligation, Due in Fourth Year	1,222
Purchase Obligation, Due in Fifth Year	1,056
Future Commitments Thereafter	3,874
Future Commitments Total	11,065
Other Purchase Contracts
Long-Term Purchase Commitment [Line Items]
Purchases Under Long Term Contracts	3,181	$ 3,602	$ 1,261
Purchase Obligation, Due in Next Twelve Months	4,698
Purchase Obligation, Due in Second Year	1,047
Purchase Obligation, Due in Third Year	737
Purchase Obligation, Due in Fourth Year	718
Purchase Obligation, Due in Fifth Year	629
Future Commitments Thereafter	1,720
Future Commitments Total	$ 9,549