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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash Flows from Operating Activities    
Net (Loss)/Income $ (1,027) $ 2,249
Adjustments to reconcile net (loss)/income to cash (used)/provided by operating activities:    
Distributions from and equity in (earnings)/losses of unconsolidated affiliates (9) 16
Depreciation and amortization 505 340
Accretion of asset retirement obligations 5 16
Provision for credit losses 80 51
Amortization of nuclear fuel 26 28
Amortization of financing costs and debt discounts 31 11
Amortization of in-the-money contracts and emissions allowances 112 128
Amortization of unearned equity compensation 61 14
Net gain on sale of assets and disposal of assets (187) (46)
Impairment losses 0 155
Changes in derivative instruments 1,515 (3,918)
Changes in current and deferred income taxes and liability for uncertain tax benefits (282) 672
Changes in collateral deposits in support of risk management activities (1,355) 3,121
Changes in nuclear decommissioning trust liability 2 (5)
Uplift securitization proceeds received from ERCOT 0 689
Changes in other working capital (505) (332)
Cash (used)/provided by operating activities (1,028) 3,189
Cash Flows from Investing Activities    
Payments for acquisitions of businesses and assets, net of cash acquired (2,498) (53)
Capital expenditures (324) (150)
Net purchases of emission allowances (25) (19)
Investments in nuclear decommissioning trust fund securities (185) (271)
Proceeds from the sale of nuclear decommissioning trust fund securities 180 278
Proceeds from sales of assets, net of cash disposed 229 96
Proceeds from insurance recoveries for property, plant and equipment, net 121 0
Cash used by investing activities (2,502) (119)
Cash Flows from Financing Activities    
Proceeds from issuance of preferred stock, net of fees 635 0
Payments of dividends to common stockholders (174) (168)
Payments for share repurchase activity [1] (16) (366)
Net receipts from settlement of acquired derivatives that include financing elements 318 950
Net proceeds of Revolving Credit Facility 700 0
Proceeds from issuance of long-term debt 731 0
Payments of debt issuance costs (22) 0
Repayments of long-term debt and finance leases (10) (2)
Cash provided by financing activities 2,162 414
Effect of exchange rate changes on cash and cash equivalents 3 0
Net (Decrease)/Increase in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash (1,365) 3,484
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period 2,178 1,110
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period $ 813 $ 4,594
[1] ncludes $(16) million and $(6) million of equivalent shares purchased in lieu of tax withholdings on equity compensation issuances during the six months ended June 30, 2023 and June 30, 2022, respectively