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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash Flows from Operating Activities      
Net Income $ 510 $ 4,441 $ 268
Income/(loss) from discontinued operations, net of income tax 0 321 (192)
Income from continuing operations 510 4,120 460
Adjustments to reconcile net income to net cash provided by operating activities:      
Distributions from and equity in earnings of unconsolidated affiliates 45 14 46
Depreciation and amortization 435 373 421
Accretion of asset retirement obligations 45 51 38
Provision for credit losses 108 95 85
Amortization of nuclear fuel 54 52 48
Amortization of financing costs and debt discounts 48 26 29
Loss on debt extinguishment, net 9 51 44
Amortization of emission allowances, out-of-market contracts and REC retirements 70 72 71
Amortization of unearned equity compensation 22 20 25
Net gain on sale of assets and disposal of assets (23) (23) (49)
Impairment losses 93 113 114
Changes in derivative instruments 137 34 37
Changes in deferred income taxes and liability for uncertain tax benefits 228 (3,353) 5
Changes in collateral deposits in support of risk management activities 127 105 (105)
Changes in nuclear decommissioning trust liability 51 37 60
Oil lower of cost or market adjustment 29 0 2
GenOn settlement, net of insurance proceeds 0 0 (63)
Net loss on deconsolidation of Agua Caliente and Ivanpah projects 0 0 13
Cash provided/(used) by changes in other working capital, net of acquisition and disposition effects:      
Accounts receivable - trade 0 5 (83)
Inventory 27 22 29
Prepayments and other current assets 4 29 (41)
Accounts payable (56) (177) 113
Accrued expenses and other current liabilities (42) (75) (192)
Other assets and liabilities (84) (186) (104)
Cash provided by continuing operations 1,837 1,405 1,003
Cash provided by discontinued operations 0 8 374
Net Cash Provided by Operating Activities 1,837 1,413 1,377
Cash Flows from Investing Activities      
Payments for acquisitions of assets, businesses and leases (284) (355) (243)
Capital expenditures (230) (228) (388)
Net (purchases)/sales of emissions allowances (10) 11 19
Investments in nuclear decommissioning trust fund securities (492) (416) (572)
Proceeds from sales of nuclear decommissioning trust fund securities 439 381 513
Proceeds from sale of assets, net of cash disposed and sale of discontinued operations, net of fees 81 1,294 1,564
Deconsolidations of Agua Caliente and Ivanpah projects 0 0 (268)
Changes in investments in unconsolidated affiliates 2 (91) (39)
Net contributions to discontinued operations 0 (44) (60)
Other 0 6 (6)
Cash (used)/provided by continuing operations (494) 558 520
Cash used by discontinued operations 0 (2) (725)
Net Cash (Used)/Provided by Investing Activities (494) 556 (205)
Cash Flows from Financing Activities      
Proceeds from issuance of long-term debt 3,234 1,833 1,100
Payments for short and long-term debt (335) (2,571) (1,734)
Net proceeds of Revolving Credit Facility (83) 83 0
Payments of debt issuance costs (75) (35) (19)
Payments of dividends to common stockholders (295) (32) (37)
Payments for share repurchase activity (229) (1,440) (1,250)
Payments for debt extinguishment costs (5) (26) (32)
Purchase of and distributions to noncontrolling interests from subsidiaries (2) (2) (16)
Proceeds from issuance of common stock 1 3 21
Receivable from affiliate 0 0 (26)
Other (7) (4) (4)
Cash provided/(used) by continuing operations 2,204 (2,191) (1,997)
Cash provided by discontinued operations 0 43 471
Net Cash (Used)/Provided by Financing Activities 2,204 (2,148) (1,526)
Effect of exchange rate changes on cash and cash equivalents (2) 0 1
Change in Cash from discontinued operations 0 49 120
Net Increase/(Decrease) in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash 3,545 (228) (473)
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period 385 613 1,086
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period $ 3,930 $ 385 $ 613