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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash Flows from Operating Activities      
Net Income/(Loss) $ 268 $ (2,337) $ (891)
(Loss)/income from discontinued operations, net of income tax (192) (992) 65
Net Income/(Loss) from Continuing Operations 460 (1,345) (956)
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:      
Distributions and equity in earnings of unconsolidated affiliates 46 102 67
Depreciation, amortization and accretion 459 596 772
Provision for bad debts 85 68 45
Amortization of nuclear fuel 48 51 49
Amortization of financing costs and debt discount/premiums 29 29 33
Adjustment for debt extinguishment 44 49 142
Amortization of intangibles and out-of-market contracts 45 54 68
Amortization of unearned equity compensation 25 35 10
Net (gain)/loss on sale of assets and equity/cost method investments (49) (9) 139
Impairment losses 114 1,614 751
Changes in derivative instruments 37 (170) 16
Changes in deferred income taxes and liability for uncertain tax benefits 5 13 (12)
Changes in collateral deposits in support of risk management activities (105) (80) 396
Changes in nuclear decommissioning trust liability 60 11 41
GenOn settlement, net of insurance proceeds (63) 0 0
Net loss on deconsolidation of Agua Caliente and Ivanpah projects 13 0 0
Cash provided/(used) by changes in other working capital, net of acquisition and disposition effects:      
Accounts receivable - trade (83) (83) 24
Inventory 31 143 60
Prepayments and other current assets (41) (187) (120)
Accounts payable 113 44 (59)
Accrued expenses and other current liabilities (166) (88) (61)
Other assets and liabilities (104) 9 32
Cash provided/(used) by continuing operations 1,003 856 1,437
Cash provided by discontinued operations 374 754 471
Net Cash Provided by Operating Activities 1,377 1,610 1,908
Cash Flows from Investing Activities      
Acquisition of businesses, net of cash acquired (243) (14) 0
Capital expenditures (388) (254) (544)
Proceeds from renewable energy grants 0 8 36
Net proceeds from sale/(purchases) of emission allowances 19 66 (1)
Investments in nuclear decommissioning trust fund securities (572) (512) (551)
Proceeds from sales of nuclear decommissioning trust fund securities 513 501 510
Proceeds from sale of assets, net of cash disposed and sale of discontinued operations, net of fees 1,564 430 241
Deconsolidation of Agua Caliente and Ivanpah projects (268) 0 0
Changes in investments in unconsolidated affiliates (39) (57) (33)
Net (contributions to)/distributions from discontinued operations (60) 150 (58)
Other (6) 22 31
Cash provided/(used) by continuing operations 520 340 (369)
Cash used by discontinued operations (725) (979) (388)
Net Cash Used by Investing Activities (205) (639) (757)
Cash Flows from Financing Activities      
Payments of dividends to preferred and common stockholders (37) (38) (76)
Payments for treasury stock (1,250) 0 0
Payments for preferred shares 0 0 (226)
Payments for debt extinguishment costs (32) (42) (121)
Net distributions to noncontrolling interest from subsidiaries (16) (30) (27)
Proceeds/(payments) from issuance of common stock 21 (2) 1
Proceeds from issuance of long-term debt 1,100 1,178 4,412
Payments of debt issuance costs (19) (18) (61)
Payments for short and long-term debt (1,734) (1,884) (5,146)
Receivable from affiliate (26) (125) 0
Other (4) (8) (7)
Cash used by continuing operations (1,997) (969) (1,251)
Cash provided/(used) by discontinued operations 471 (169) 483
Net Cash (Used)/Provided by Financing Activities (1,526) (1,138) (768)
Effect of exchange rate changes on cash and cash equivalents 1 (1) 1
Change in Cash from discontinued operations 120 (394) 566
Net (Decrease)/Increase in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash (473) 226 (182)
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period 1,086 860 1,042
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period $ 613 $ 1,086 $ 860