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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Cash Flows from Operating Activities |  |  |
Net income | $ 1,221 | $ 2,187 | $ 510
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Distributions from and equity in earnings of unconsolidated affiliates | 7 | 20 | 45
Depreciation and amortization | 634 | 785 | 435
Accretion of asset retirement obligations | 55 | 30 | 45
Provision for credit losses | 11 | 698 | 108
Amortization of nuclear fuel | 54 | 51 | 54
Amortization of financing costs and debt discounts | 23 | 39 | 48
Loss on debt extinguishment | 0 | 77 | 9
Amortization of in-the-money contracts and emission allowances | 158 | 106 | 70
Amortization of unearned equity compensation | 28 | 21 | 22
Net gain on sale of assets and disposal of assets | (102) | (261) | (23)
Impairment losses | 206 | 544 | 93
Changes in derivative instruments | (3,221) | (3,626) | 137
Changes in deferred income taxes and liability for uncertain tax benefits | 382 | 604 | 228
Changes in collateral deposits in support of risk management activities | 896 | 797 | 127
Changes in nuclear decommissioning trust liability | 9 | 40 | 51
Oil lower of cost or market adjustment | 0 | 0 | 29
Uplift securitization proceeds received/(receivable) from ERCOT | 689 | (689) | 0
Cash (used)/provided by changes in other working capital, net of acquisition and disposition effects: |  |  |
Accounts receivable - trade | (1,560) | (1,232) | 0
Inventory | (252) | (61) | 27
Prepayments and other current assets | 17 | 31 | 4
Accounts payable | 1,295 | 476 | (56)
Accrued expenses and other current liabilities | (29) | (55) | (42)
Other assets and liabilities | (161) | (89) | (84)
Cash provided by operating activities | 360 | 493 | 1,837
Cash Flows from Investing Activities |  |  |
Payments for acquisitions of assets, businesses and leases | (62) | (3,559) | (284)
Capital expenditures | (367) | (269) | (230)
Net purchases of emissions allowances | (6) | 0 | (10)
Investments in nuclear decommissioning trust fund securities | (454) | (751) | (492)
Proceeds from sales of nuclear decommissioning trust fund securities | 448 | 710 | 439
Proceeds from sale of assets, net of cash disposed and fees | 109 | 830 | 81
Changes in investments in unconsolidated affiliates | 0 | 0 | 2
Cash used by investing activities | (332) | (3,039) | (494)
Cash Flows from Financing Activities |  |  |
Net receipts/(payments) from settlement of acquired derivatives that include financing elements | 1,995 | 938 | (7)
Payments for share repurchase activity | (606) | (48) | (229)
Payments of dividends to common stockholders | (332) | (319) | (295)
Proceeds from issuance of long-term debt | 0 | 1,100 | 3,234
Payments for short and long-term debt | (5) | (1,861) | (335)
Payments for debt extinguishment costs | 0 | (65) | (5)
Payments of debt issuance costs | (9) | (18) | (75)
Repayments of Revolving Credit Facility | 0 | 0 | (83)
Proceeds from issuance of common stock | 0 | 1 | 1
Purchase of and distributions to noncontrolling interests from subsidiaries | 0 | 0 | (2)
Cash provided/(used) by financing activities | 1,043 | (272) | 2,204
Effect of exchange rate changes on cash and cash equivalents | (3) | (2) | (2)
Net Increase/(Decrease) in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash | 1,068 | (2,820) | 3,545
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period | 1,110 | 3,930 | 385
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period | $ 2,178 | $ 1,110 | $ 3,930

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- Definition The current period expense charged against earnings for the periodic recognition of the entity's ownership in nuclear fuel based on units of production over the estimated useful life. As a noncash (income) expense, this element is added back to net income when calculating cash provided by (used in) operations using the indirect method. + References No definition available. + Details
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- Definition The net change during the reporting period in the nuclear decommissioning trust liability, representing amounts collected, through rates or other authorized charges to electric utility customers, which are designated for funding the Company's portioning of the decommissioning of its nuclear facilities. Following the completion of the decommissioning, if surplus funds remain in the decommissioning trusts, any excess will be refunded to the respective rate payers. + References No definition available. + Details
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