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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash Flows from Operating Activities    
Net (Loss)/Income $ (82) $ 121
Adjustments to reconcile net (loss)/income to cash (used)/provided by operating activities:    
Distributions from and equity in losses of unconsolidated affiliates 17 16
Depreciation and amortization 317 109
Accretion of asset retirement obligations 3 11
Provision for credit losses 611 24
Amortization of nuclear fuel 13 13
Amortization of financing costs and debt discounts 11 6
Amortization of emissions allowances and energy credits 7 7
Amortization of unearned equity compensation 4 5
Gain on sale and disposal of assets (18) (14)
Impairment losses 0 18
Changes in derivative instruments (902) (46)
Changes in deferred income taxes and liability for uncertain tax benefits (71) 19
Changes in collateral deposits in support of energy risk management activities 1 9
Changes in nuclear decommissioning trust liability 15 8
Changes in other working capital (843) (98)
Cash (used)/provided by operating activities (917) 208
Cash Flows from Investing Activities    
Payments for acquisitions of businesses, net of cash acquired (3,482) 0
Capital expenditures (63) (66)
Net purchases of emission allowances (5) (8)
Investments in nuclear decommissioning trust fund securities (129) (121)
Proceeds from the sale of nuclear decommissioning trust fund securities 118 112
Proceeds from sale of assets, net of cash disposed 197 15
Cash used by investing activities (3,364) (68)
Cash Flows from Financing Activities    
Payments of dividends to common stockholders (80) (74)
Payments for share repurchase activity (9) (179)
Net payments from settlement of acquired derivatives that include financing elements 190 (3)
Net proceeds of Revolving Credit Facility and Receivables Securitization Facilities 825 552
Payments of debt issuance costs (2) 0
Proceeds from issuance of common stock 1 0
Repayments of long-term debt and finance leases (1) (60)
Proceeds from issuance of long-term debt 0 59
Purchase of and distributions to noncontrolling interests from subsidiaries 0 (2)
Net Cash Provided by Financing Activities 924 293
Effect of exchange rate changes on cash and cash equivalents 1 0
Net (Decrease)/increase in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash (3,356) 433
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 $ 574 $ 818