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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Cash Flows from Operating Activities    
Net Income $ 2,316 $ 2,614
Adjustments to reconcile net income to cash provided by operating activities:    
Distributions from and equity in earnings of unconsolidated affiliates 7 8
Depreciation and amortization 485 569
Accretion of asset retirement obligations 20 21
Provision for credit losses 103 715
Amortization of nuclear fuel 42 39
Amortization of financing costs and debt discounts 17 30
Loss on debt extinguishment 0 57
Amortization of in-the-money contracts and emissions allowances 122 111
Amortization of unearned equity compensation 21 16
Net gain on sale and disposal of assets (82) (29)
Impairment losses 198 306
Changes in derivative instruments (4,480) (4,419)
Changes in deferred income taxes and liability for uncertain tax benefits 688 782
Changes in collateral deposits in support of energy risk management activities 2,321 1,970
Changes in nuclear decommissioning trust liability 2 38
Uplift securitization proceeds received from ERCOT 689 0
Changes in other working capital (711) (973)
Cash provided by operating activities 1,758 1,855
Cash Flows from Investing Activities    
Payments for acquisitions of businesses and assets, net of cash acquired (60) (3,534)
Capital expenditures (250) (219)
Net (purchases)/sales of emission allowances (4) 6
Investments in nuclear decommissioning trust fund securities (361) (460)
Proceeds from the sale of nuclear decommissioning trust fund securities 363 424
Proceeds from sales of assets, net of cash disposed 107 198
Cash used by investing activities (205) (3,585)
Cash Flows from Financing Activities    
Payments of dividends to common stockholders (252) (239)
Payments for share repurchase activity (484) (9)
Net receipts from settlement of acquired derivatives that include financing elements 1,596 396
Repayments of long-term debt and finance leases (4) (1,360)
Proceeds from issuance of long-term debt 0 1,100
Payments for debt extinguishment costs 0 (48)
Payments of debt issuance costs (1) (18)
Proceeds from issuance of common stock 0 1
Net Cash Provided/(Used) by Financing Activities 855 (177)
Effect of exchange rate changes on cash and cash equivalents (5) (2)
Net Increase/(Decrease) in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash 2,403 (1,909)
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period 1,110 3,930
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period $ 3,513 $ 2,021