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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash Flows from Operating Activities    
Net Income/(Loss) $ 1,736 $ (82)
Adjustments to reconcile net income/(loss) to cash provided by operating activities:    
Distributions from and equity in losses of unconsolidated affiliates 18 17
Depreciation and amortization 183 317
Accretion of asset retirement obligations 7 3
Provision for credit losses 25 611
Amortization of nuclear fuel 14 13
Amortization of financing costs and debt discounts 6 11
Amortization of in-the-money contracts and emissions allowances 147 7
Amortization of unearned equity compensation 6 4
Net gain on sale and disposal of assets (6) (18)
Changes in derivative instruments (2,816) (902)
Changes in deferred income taxes and liability for uncertain tax benefits 527 (71)
Changes in collateral deposits in support of energy risk management activities 2,007 1
Changes in nuclear decommissioning trust liability (7) 15
Changes in other working capital (171) (843)
Cash provided/(used) by operating activities 1,676 (917)
Cash Flows from Investing Activities    
Payments for acquisitions of businesses and assets, net of cash acquired (26) (3,482)
Capital expenditures (60) (63)
Net purchases of emission allowances (18) (5)
Investments in nuclear decommissioning trust fund securities (151) (129)
Proceeds from the sale of nuclear decommissioning trust fund securities 161 118
Proceeds from sale of assets, net of cash disposed 14 197
Cash used by investing activities (80) (3,364)
Cash Flows from Financing Activities    
Payments of dividends to common stockholders (85) (80)
Payments for share repurchase activity (188) (9)
Net receipts from settlement of acquired derivatives that include financing elements 561 190
Net proceeds of Revolving Credit Facility and Receivables Securitization Facilities 0 825
Repayments of long-term debt and finance leases (1) (1)
Payments of debt issuance costs 0 (2)
Proceeds from issuance of common stock 0 1
Net Cash Provided by Financing Activities 287 924
Effect of exchange rate changes on cash and cash equivalents 3 1
Net Increase/(Decrease) in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash 1,886 (3,356)
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 $ 2,996 $ 574