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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash Flows from Operating Activities      
Net Loss $ (2,337) $ (891) $ (6,436)
(Loss)/income from discontinued operations, net of income tax (789) 92 (105)
Net Loss from Continuing Operations (1,548) (983) (6,331)
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:      
Equity in earnings and distribution of unconsolidated affiliates 55 54 37
Depreciation and amortization 1,056 1,172 1,351
Provision for bad debts 68 48 64
Amortization of nuclear fuel 51 49 45
Amortization of financing costs and debt discount/premiums 60 55 47
Adjustment for debt extinguishment 53 142 (10)
Amortization of intangibles and out-of-market contracts 108 167 151
Amortization of unearned equity compensation 35 10 39
Net (gain)/loss on sale of assets and equity method investments (34) 70 14
Gain on post retirement benefits curtailment 0 0 (21)
Impairment losses 1,788 972 4,916
Changes in derivative instruments (171) 32 235
Changes in deferred income taxes and liability for uncertain tax benefits 91 (43) 1,326
Changes in collateral deposits in support of risk management activities (80) 398 (334)
Proceeds from sale of emission allowances 25 34 (24)
Changes in nuclear decommissioning trust liability 11 41 (2)
Cash provided/(used) by changes in other working capital, net of acquisition and disposition effects:      
Accounts receivable - trade (99) (7) 113
Inventory 143 71 (59)
Prepayments and other current assets 12 (44) (21)
Accounts payable 77 (39) (180)
Accrued expenses and other current liabilities (60) (35) (29)
Other assets and liabilities (216) 43 (40)
Cash provided by continuing operations 1,425 2,207 1,287
Cash (used)/provided by discontinued operations (38) (119) 62
Net Cash Provided by Operating Activities 1,387 2,088 1,349
Cash Flows from Investing Activities      
Acquisition of businesses, net of cash acquired (41) (209) (31)
Capital expenditures (1,111) (976) (1,029)
Net cash proceeds from notes receivable 17 17 18
Proceeds from renewable energy grants 8 36 82
Proceeds from/(purchases) of emission allowances, net of purchases 66 (1) 41
Investments in nuclear decommissioning trust fund securities (512) (551) (629)
Proceeds from sales of nuclear decommissioning trust fund securities 501 510 631
Proceeds from sale of assets, net 87 73 27
Investments in unconsolidated affiliates (40) (23) (395)
Other 12 35 16
Cash used by continuing operations (1,013) (1,089) (1,269)
Cash (used)/provided by discontinued operations (53) 297 (259)
Net Cash Used by Investing Activities (1,066) (792) (1,528)
Cash Flows from Financing Activities      
Payments of dividends to preferred and common stockholders (38) (76) (201)
Net receipts from settlement of acquired derivatives that include financing elements 2 6 14
Payments for treasury stock 0 0 (437)
Payments for preferred shares 0 (226) 0
Payments for debt extinguishment costs (42) (121) 0
Distributions to, net of contributions from, noncontrolling interests in subsidiaries 95 (156) 47
Proceeds from sale of noncontrolling interests in subsidiaries 0 0 600
(Payments)/Proceeds from issuance of common stock (2) 1 1
Proceeds from issuance of long-term debt 2,270 5,527 1,004
Payments of debt issuance and hedging costs (63) (89) (21)
Payments for short and long-term debt (2,348) (5,908) (1,362)
Receivable from affiliate (125) 0 0
Other (10) (13) (22)
Cash used by continuing operations (261) (1,055) (377)
Cash (used)/provided by discontinued operations (224) 140 (55)
Net Cash Provided/(Used) by Financing Activities (485) (915) (432)
Effect of exchange rate changes on cash and cash equivalents (1) 1 10
Change in Cash from discontinued operations (315) 318 (252)
Net Increase/(Decrease) in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash 150 64 (349)
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period 1,386 1,322 1,671
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period $ 1,536 $ 1,386 $ 1,322