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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash Flows from Operating Activities      
Net Income/(Loss) $ 4,441 $ 268 $ (2,337)
Income/(loss) from discontinued operations, net of income tax 321 (192) (992)
Income/(loss) from continuing operations 4,120 460 (1,345)
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:      
Distributions and equity in earnings of unconsolidated affiliates 14 46 102
Depreciation and amortization 373 421 596
Accretion of asset retirement obligations 51 38 44
Provision for bad debts 95 85 68
Amortization of nuclear fuel 52 48 51
Amortization of financing costs and debt discount/premiums 26 29 29
Loss on debt extinguishment, net 51 44 49
Amortization of emission allowances and out-of-market contracts 38 45 54
Amortization of unearned equity compensation 20 25 35
Net gain on sale of assets and disposal of assets (23) (49) (9)
Impairment losses 113 114 1,614
Changes in derivative instruments 34 37 (170)
Changes in deferred income taxes and liability for uncertain tax benefits (3,353) 5 13
Changes in collateral deposits in support of risk management activities 105 (105) (80)
Changes in nuclear decommissioning trust liability 37 60 11
GenOn settlement, net of insurance proceeds 0 (63) 0
Net loss on deconsolidation of Agua Caliente and Ivanpah projects 0 13 0
Cash provided/(used) by changes in other working capital, net of acquisition and disposition effects:      
Accounts receivable - trade 5 (83) (83)
Inventory 22 31 143
Prepayments and other current assets 29 (41) (187)
Accounts payable (177) 113 44
Accrued expenses and other current liabilities (41) (166) (88)
Other assets and liabilities (186) (104) (35)
Cash provided by continuing operations 1,405 1,003 856
Cash provided by discontinued operations 8 374 754
Net Cash Provided by Operating Activities 1,413 1,377 1,610
Cash Flows from Investing Activities      
Payments for acquisitions of businesses (355) (243) (14)
Capital expenditures (228) (388) (254)
Net proceeds from sale of emission allowances 11 19 66
Investments in nuclear decommissioning trust fund securities (416) (572) (512)
Proceeds from sales of nuclear decommissioning trust fund securities 381 513 501
Proceeds from sale of assets, net of cash disposed and sale of discontinued operations, net of fees 1,294 1,564 430
Deconsolidations of Agua Caliente and Ivanpah projects 0 (268) 0
Net contributions to investments in unconsolidated affiliates (91) (39) (57)
Net (contributions to)/distributions from discontinued operations (44) (60) 150
Other 6 (6) 30
Cash provided by continuing operations 558 520 340
Cash used by discontinued operations (2) (725) (979)
Net Cash Provided/(Used) by Investing Activities 556 (205) (639)
Cash Flows from Financing Activities      
Payments of dividends to common stockholders (32) (37) (38)
Payments for share repurchase activity (1,440) (1,250) 0
Payments for debt extinguishment costs (26) (32) (42)
Net distributions to noncontrolling interest from subsidiaries (2) (16) (30)
Proceeds/(payments) from issuance of common stock 3 21 (2)
Proceeds from issuance of short and long-term debt 1,916 1,100 1,178
Payments of debt issuance costs (35) (19) (18)
Payments for short and long-term debt (2,571) (1,734) (1,884)
Receivable from affiliate 0 (26) (125)
Other (4) (4) (8)
Cash used by continuing operations (2,191) (1,997) (969)
Cash provided/(used) by discontinued operations 43 471 (169)
Net Cash (Used)/Provided by Financing Activities (2,148) (1,526) (1,138)
Effect of exchange rate changes on cash and cash equivalents 0 1 (1)
Change in Cash from discontinued operations 49 120 (394)
Net (Decrease)/Increase in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash (228) (473) 226
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period 613 1,086 860
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period $ 385 $ 613 $ 1,086