CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash Flows from Operating Activities
Net Income/(Loss)	$ 1,249	$ (1,027)
Adjustments to reconcile net income/(loss) to cash provided/(used) by operating activities:
Equity in and distributions from earnings of unconsolidated affiliates	(4)	(9)
Depreciation and amortization	553	505
Accretion of asset retirement obligations	3	5
Provision for credit losses	133	80
Amortization of nuclear fuel	0	26
Amortization of financing costs and debt discounts	21	31
Loss on debt extinguishment	260	0
Amortization of in-the-money contracts and emissions allowances	73	112
Amortization of unearned equity compensation	57	61
Net loss/(gain) on sale of assets and disposal of assets	8	(187)
Impairment losses	15	0
Changes in derivative instruments	(1,384)	1,515
Changes in current and deferred income taxes and liability for uncertain tax benefits	390	(282)
Changes in collateral deposits in support of risk management activities	660	(1,355)
Changes in nuclear decommissioning trust liability	0	2
Changes in other working capital	(711)	(505)
Cash provided/(used) by operating activities	1,323	(1,028)
Cash Flows from Investing Activities
Payments for acquisitions of businesses and assets, net of cash acquired	(32)	(2,498)
Capital expenditures	(172)	(324)
Net purchases of emissions allowances	(11)	(25)
Investments in nuclear decommissioning trust fund securities	0	(185)
Proceeds from the sale of nuclear decommissioning trust fund securities	0	180
Proceeds from sales of assets, net of cash disposed	11	229
Proceeds from insurance recoveries for property, plant and equipment, net	3	121
Cash used by investing activities	(201)	(2,502)
Cash Flows from Financing Activities
Proceeds from issuance of preferred stock, net of fees	0	635
Payments of dividends to preferred and common stockholders	(204)	(174)
Equivalent shares purchased in lieu of tax withholdings	(35)	(16)
Payments for share repurchase activity	(90)	0
Net (payments)/receipts from settlement of acquired derivatives that include financing elements	(12)	318
Net proceeds of Revolving Credit Facility and Receivable Securitization Facilities	0	500
Proceeds from issuance of long-term debt	875	731
Payments of debt issuance costs	(12)	(22)
Repayments of long-term debt and finance leases	(956)	(10)
Payments for debt extinguishment costs	(257)	0
Proceeds from credit facilities	625	1,870
Repayments to credit facilities	(625)	(1,670)
Cash (used)/provided by financing activities	(691)	2,162
Effect of exchange rate changes on cash and cash equivalents	0	3
Net Increase/(Decrease) in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash	431	(1,365)
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period	649	2,178
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period	$ 1,080	$ 813