Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Current Assets
Cash and cash equivalents	$ 752	$ 938
Funds deposited by counterparties	19	2
Restricted cash	469	446
Accounts receivable, net	1,162	1,058
Inventory	713	721
Derivative instruments	644	1,067
Cash collateral paid in support of energy risk management activities	277	150
Current assets - held for sale	33	9
Prepayments and other current assets	400	404
Current assets - discontinued operations	0	1,919
Total current assets	4,469	6,714
Property, plant and equipment, net	15,302	15,369
Other Assets
Equity investments in affiliates	1,127	1,120
Notes receivable, less current portion	9	16
Goodwill	662	662
Intangible assets, net	1,893	1,973
Nuclear decommissioning trust fund	637	610
Derivative instruments	226	181
Deferred income taxes	211	225
Non-current assets held-for-sale	10	10
Other non-current assets	659	841
Non-current assets - discontinued operations	0	2,961
Total other assets	5,434	8,599
Total Assets	25,205	30,682
Current Liabilities
Current portion of long-term debt and capital leases	1,042	516
Accounts payable	757	782
Accounts payable - affiliate	17	31
Derivative instruments	711	1,092
Cash collateral received in support of energy risk management activities	19	81
Accrued expenses and other current liabilities	810	990
Accrued expenses and other current liabilities - affiliate	164	0
Current liabilities - discontinued operations	0	1,210
Total current liabilities	3,520	4,702
Other Liabilities
Long-term debt and capital leases	15,842	15,957
Nuclear decommissioning reserve	262	287
Nuclear decommissioning trust liability	367	339
Deferred income taxes	20	20
Derivative instruments	293	284
Out-of-market contracts, net	219	230
Non-current liabilities held-for-sale	13	11
Other non-current liabilities	1,135	1,151
Non-current liabilities - discontinued operations	0	3,209
Total non-current liabilities	18,151	21,488
Total Liabilities	21,671	26,190
Redeemable noncontrolling interest in subsidiaries	51	46
Commitments and Contingencies
Stockholders’ Equity
Common stock	4	4
Additional paid-in capital	8,383	8,358
Retained deficit	(4,874)	(3,787)
Less treasury stock, at cost — 101,858,284 and 102,140,814 shares, respectively	(2,392)	(2,399)
Accumulated other comprehensive loss	(100)	(135)
Noncontrolling interest	2,462	2,405
Total Stockholders’ Equity	3,483	4,446
Total Liabilities and Stockholders’ Equity	$ 25,205	$ 30,682