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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash Flows from Operating Activities    
Net Income $ 2,614 $ 683
Adjustments to reconcile net income to cash provided by operating activities:    
Distributions from and equity in earnings of unconsolidated affiliates 8 6
Depreciation and amortization 569 318
Accretion of asset retirement obligations 21 46
Provision for credit losses 715 74
Amortization of nuclear fuel 39 40
Amortization of financing costs and debt discounts 30 23
Loss on debt extinguishment, net 57 1
Amortization of in-the-money contracts, emissions allowances and retirements of RECs 111 60
Amortization of unearned equity compensation 16 17
Net gain on sale and disposal of assets (29) (22)
Impairment losses 306 47
Changes in derivative instruments (4,419) (7)
Changes in deferred income taxes and liability for uncertain tax benefits 782 202
Changes in collateral deposits in support of energy risk management activities 1,970 96
Changes in nuclear decommissioning trust liability 38 39
Oil lower of cost or market adjustment 0 29
Changes in other working capital (973) (266)
Cash provided by operating activities 1,855 1,386
Cash Flows from Investing Activities    
Payments for acquisitions of businesses, net of cash acquired (3,534) (277)
Capital expenditures (219) (167)
Net sales/(purchases) of emission allowances 6 (15)
Investments in nuclear decommissioning trust fund securities (460) (360)
Proceeds from the sale of nuclear decommissioning trust fund securities 424 318
Proceeds from sale of assets, net of cash disposed 198 15
Changes in investments in unconsolidated affiliates 0 2
Cash used by investing activities (3,585) (484)
Cash Flows from Financing Activities    
Payments of dividends to common stockholders (239) (221)
Payments for share repurchase activity (9) (229)
Net receipts/(payments) from settlement of acquired derivatives that include financing elements 396 (6)
Repayments of long-term debt and finance leases (1,360) (62)
Proceeds from issuance of long-term debt 1,100 59
Payments for debt extinguishment costs (48) 0
Payments of debt issuance costs (18) (24)
Proceeds from issuance of common stock 1 1
Net repayments of Revolving Credit Facility and Receivables Securitization Facilities 0 (83)
Purchase of and distributions to noncontrolling interests from subsidiaries 0 (2)
Net Cash Used by Financing Activities (177) (567)
Effect of exchange rate changes on cash and cash equivalents (2) (2)
Net (Decrease)/Increase in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash (1,909) 333
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period 3,930 385
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period $ 2,021 $ 718