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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Cash Flows from Operating Activities    
Net Income $ 750 $ 511
Adjustments to reconcile net income to cash provided by operating activities:    
Equity in and distributions from earnings of unconsolidated affiliates (1) (2)
Depreciation of property, plant and equipment and amortization of customer relationships and other intangible assets 218 268
Amortization of capitalized contract costs 108 65
Net (gain) on/accretion of asset retirement obligations (10) 4
Provision for credit losses 56 75
Amortization of financing costs and debt discounts 6 11
Loss on debt extinguishment 0 58
Amortization of in-the-money contracts and emissions allowances 44 78
Amortization of unearned equity compensation 29 30
Net loss on sale of assets and disposal of assets 8 9
Gain on proceeds from insurance recoveries for property, plant and equipment, net (100) 0
Changes in derivative instruments (320) (535)
Changes in current and deferred income taxes and liability for uncertain tax benefits 143 139
Changes in collateral deposits in support of risk management activities 623 289
Changes in other working capital (699) (733)
Cash provided by operating activities 855 267
Cash Flows from Investing Activities    
Payments for acquisitions of assets (20) (22)
Capital expenditures (217) (69)
Net purchases of emissions allowances (3) (7)
Proceeds from sales of assets 6 3
Proceeds from insurance recoveries for property, plant and equipment, net 100 3
Cash used by investing activities (134) (92)
Cash Flows from Financing Activities    
Payments of dividends to preferred and common stockholders (121) (118)
Equivalent shares purchased in lieu of tax withholdings (40) (23)
Payments for share repurchase activity (314) 0
Net receipts from settlement of acquired derivatives that include financing elements 25 8
Payments of deferred financing costs (3) 0
Repayments of long-term debt and finance leases (5) (97)
Payments for debt extinguishment costs 0 (58)
Proceeds from credit facilities 0 525
Repayments to credit facilities 0 (525)
Cash used by financing activities (458) (288)
Effect of exchange rate changes on cash and cash equivalents 2 (2)
Net Increase/(Decrease) in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash 265 (115)
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period 1,173 649
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period $ 1,438 $ 534