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Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash Flows from Operating Activities    
Net Income/(Loss) $ 233 $ (203)
Loss from discontinued operations, net of income tax 0 (34)
Income/(loss) from continuing operations 233 (169)
Adjustments to reconcile net income to net cash provided/(used) by operating activities:    
Distributions and equity in earnings of unconsolidated affiliates 12 8
Depreciation and amortization 235 257
Provision for bad debts 15 9
Amortization of nuclear fuel 13 12
Amortization of financing costs and debt discount/premiums 14 15
Adjustment for debt extinguishment 2 0
Amortization of intangibles and out-of-market contracts 22 30
Amortization of unearned equity compensation 13 8
Changes in deferred income taxes and liability for uncertain tax benefits (3) 1
Changes in nuclear decommissioning trust liability 34 36
Changes in derivative instruments (247) 38
Changes in collateral deposits in support of energy risk management activities 163 (127)
Gain on sale of emission allowances (8) 0
Gain on sale of assets (2) (2)
Changes in other working capital (139) (198)
Cash provided/(used) by continuing operations 357 (82)
Cash provided by discontinued operations 0 15
Net Cash Provided/(Used) by Operating Activities 357 (67)
Cash Flows from Investing Activities    
Acquisitions of businesses, net of cash acquired (62) (3)
Capital expenditures (358) (236)
Decrease in notes receivable 3 4
Purchases of emission allowances (17) (9)
Proceeds from sale of emission allowances 23 11
Investments in nuclear decommissioning trust fund securities (216) (153)
Proceeds from the sale of nuclear decommissioning trust fund securities 182 117
Proceeds from sale of assets, net of cash disposed of 11 14
Changes in investments in unconsolidated affiliates 2 (12)
Other 0 18
Cash (used)/provided by continuing operations (432) (249)
Cash used by discontinued operations 0 (32)
Net Cash (Used)/Provided by Investing Activities (432) (281)
Cash Flows from Financing Activities    
Payment of dividends to common and preferred stockholders (10) (9)
Payment for treasury stock (93) 0
Net receipts from settlement of acquired derivatives that include financing elements 0 1
Proceeds from issuance of long-term debt 179 193
Payments for short and long-term debt (228) (177)
Net contributions from/(distributions to) noncontrolling interests in subsidiaries 110 (5)
Payment of debt issuance costs (7) (14)
Other - contingent consideration 0 (10)
Cash used by continuing operations (49) (21)
Cash used by discontinued operations 0 (132)
Net Cash Used by Financing Activities (49) (153)
Effect of exchange rate changes on cash and cash equivalents 0 (7)
Change in Cash from discontinued operations 0 (149)
Net Decrease in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash (124) (359)
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period 1,536 1,386
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period $ 1,412 $ 1,027