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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash Flows from Operating Activities    
Net Income $ 683 $ 1,056
(Loss)/income from discontinued operations, net of income tax 0 399
Income/(loss) from continuing operations 683 657
Adjustments to reconcile net income to cash provided by operating activities:    
Distributions from and equity in losses/(earnings) of unconsolidated affiliates 6 (5)
Depreciation and amortization 318 261
Accretion of asset retirement obligations 46 31
Provision for credit losses 74 87
Amortization of nuclear fuel 40 40
Amortization of financing costs and debt discount/premiums 23 20
Loss on debt extinguishment, net 1 47
Amortization of emissions allowances and energy credits 60 28
Amortization of unearned equity compensation 17 15
Gain on sale and disposal of assets (22) (20)
Impairment losses 47 108
Changes in derivative instruments (7) 36
Changes in deferred income taxes and liability for uncertain tax benefits 202 (3)
Changes in collateral deposits in support of energy risk management activities 96 129
Changes in nuclear decommissioning trust liability 39 27
Changes in other working capital (237) (569)
Cash provided/(used) by continuing operations 1,386 889
Cash provided by discontinued operations 0 8
Net Cash Provided/(Used) by Operating Activities 1,386 897
Cash Flows from Investing Activities    
Payments for acquisitions of assets and businesses (277) (348)
Capital expenditures (167) (183)
Net proceeds from notes receivable 0 2
Net (purchases)/sales of emission allowances (15) 14
Investments in nuclear decommissioning trust fund securities (360) (295)
Proceeds from the sale of nuclear decommissioning trust fund securities 318 271
Proceeds from sale of assets, net of cash disposed and sale of discontinued operations, net of fees 15 1,293
Changes in investments in unconsolidated affiliates 2 (94)
Contributions to discontinued operations 0 (44)
Cash (used)/provided by continuing operations (484) 616
Cash used by discontinued operations 0 (2)
Net Cash (Used)/Provided by Investing Activities (484) 614
Cash Flows from Financing Activities    
Payments of dividends to common stockholders (221) (24)
Payments for share repurchase activity (229) (1,322)
Payments for debt extinguishment costs 0 (24)
Purchase of and distributions to noncontrolling interests from subsidiaries (2) (1)
Proceeds from issuance of common stock 1 3
Proceeds from issuance of long-term debt 59 1,833
Repayments of long-term debt (62) (2,487)
Net (repayments)/proceeds of Revolving Credit Facility (83) 215
Other (6) 0
Cash used by continuing operations (567) (1,841)
Cash provided by discontinued operations 0 43
Net Cash Used by Financing Activities (567) (1,798)
Effect of exchange rate changes on cash and cash equivalents (2) 0
Change in Cash from discontinued operations 0 49
Net Increase/(Decrease) in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash 333 (336)
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period 385 613
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period $ 718 $ 277