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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Cash Flows from Operating Activities    
Net Income $ 2,249 $ 996
Adjustments to reconcile net income to cash provided by operating activities:    
Distributions from and equity in (losses)/earnings of unconsolidated affiliates 16 14
Depreciation and amortization 340 370
Accretion of asset retirement obligations 16 14
Provision for credit losses 51 651
Amortization of nuclear fuel 28 25
Amortization of financing costs and debt discounts 11 20
Amortization of in-the-money contracts and emissions allowances 128 108
Amortization of unearned equity compensation 14 10
Net gain on sale and disposal of assets (46) (25)
Impairment losses 155 306
Changes in derivative instruments (3,918) (2,430)
Changes in deferred income taxes and liability for uncertain tax benefits 672 257
Changes in collateral deposits in support of energy risk management activities 3,121 696
Changes in nuclear decommissioning trust liability (5) 30
Uplift securitization proceeds received from ERCOT 689 0
Changes in other working capital (332) (665)
Cash provided by operating activities 3,189 377
Cash Flows from Investing Activities    
Payments for acquisitions of businesses and assets, net of cash acquired (53) (3,521)
Capital expenditures (150) (143)
Net (purchases)/sales of emission allowances (19) 1
Investments in nuclear decommissioning trust fund securities (271) (253)
Proceeds from the sale of nuclear decommissioning trust fund securities 278 226
Proceeds from sales of assets, net of cash disposed 96 198
Cash used by investing activities (119) (3,492)
Cash Flows from Financing Activities    
Payments of dividends to common stockholders (168) (159)
Payments for share repurchase activity (366) (9)
Net receipts from settlement of acquired derivatives that include financing elements 950 191
Net proceeds of Revolving Credit Facility and Receivables Securitization Facilities 0 75
Repayments of long-term debt and finance leases (2) (4)
Payments of debt issuance costs 0 (2)
Proceeds from issuance of common stock 0 1
Net Cash Provided by Financing Activities 414 93
Effect of exchange rate changes on cash and cash equivalents 0 1
Net Increase/(Decrease) in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash 3,484 (3,021)
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 $ 4,594 $ 909