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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash Flows from Operating Activities    
Net Income $ 434 $ 684
Income from discontinued operations, net of income tax 0 401
Income/(loss) from continuing operations 434 283
Adjustments to reconcile net income to cash provided by operating activities:    
Distributions from and equity in (earnings)/losses of unconsolidated affiliates 7 22
Depreciation and amortization 219 170
Accretion of asset retirement obligations 18 14
Provision for credit losses 48 52
Amortization of nuclear fuel 25 27
Amortization of financing costs and debt discount/premiums 12 13
Loss on debt extinguishment, net 1 47
Amortization of emissions allowances and energy credits 33 14
Amortization of unearned equity compensation 12 10
(Gain)/loss on sale of assets and disposal of assets (15) 1
Impairment losses 18 1
Changes in derivative instruments (131) (22)
Changes in deferred income taxes and liability for uncertain tax benefits 116 (5)
Changes in collateral deposits in support of energy risk management activities 58 125
Changes in nuclear decommissioning trust liability 36 17
Changes in other working capital (199) (352)
Cash provided by continuing operations 692 417
Cash provided by discontinued operations 0 8
Net Cash Provided/(Used) by Operating Activities 692 425
Cash Flows from Investing Activities    
Payments for acquisitions of businesses (5) (21)
Capital expenditures (116) (107)
Net purchases of emission allowances (4) (1)
Investments in nuclear decommissioning trust fund securities (257) (209)
Proceeds from the sale of nuclear decommissioning trust fund securities 220 191
Proceeds from sale of assets, net of cash disposed and sale of discontinued operations, net of fees 15 1,289
Net distributions from investments in unconsolidated affiliates 2 7
Contributions to discontinued operations 0 (44)
Cash (used)/provided by continuing operations (145) 1,105
Cash used by discontinued operations 0 (2)
Net Cash (Used)/Provided by Investing Activities (145) 1,103
Cash Flows from Financing Activities    
Payments of dividends to common stockholders (148) (16)
Payments for share repurchase activity (229) (1,075)
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 2
Proceeds from issuance of long-term debt 59 1,833
Repayments of long-term debt (61) (2,485)
Net repayment of Revolving Credit Facility (83) 0
Other (5) 0
Cash used by continuing operations (469) (1,799)
Cash provided by discontinued operations 0 43
Net Cash Used by Financing Activities (469) (1,756)
Effect of exchange rate changes on cash and cash equivalents (1) 0
Change in Cash from discontinued operations 0 49
Net Increase/(Decrease) in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash 77 (277)
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 $ 462 $ 336