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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Current Assets    
Cash and cash equivalents $ 991 $ 938
Funds deposited by counterparties 37 2
Restricted cash 508 446
Accounts receivable — trade 1,079 1,058
Inventory 532 721
Derivative instruments 626 1,067
Cash collateral posted in support of energy risk management activities 171 150
Accounts receivable — affiliate 95 0
Current assets held-for-sale 115 9
Prepayments and other current assets 261 404
Current assets - discontinued operations 0 1,919
Total current assets 4,415 6,714
Property, plant and equipment, net 13,908 15,369
Other Assets    
Equity investments in affiliates 1,038 1,120
Notes receivable, less current portion 2 16
Goodwill 539 662
Intangible assets, net 1,746 1,973
Nuclear decommissioning trust fund 692 610
Derivative instruments 172 181
Deferred income taxes 134 225
Non-current assets held-for-sale 43 10
Other non-current assets 629 841
Non-current assets - discontinued operations 0 2,961
Total other assets 4,995 8,599
Total Assets 23,318 30,682
Current Liabilities    
Current portion of long-term debt and capital leases 688 516
Accounts payable 881 782
Accounts payable - affiliate 33 31
Derivative instruments 555 1,092
Cash collateral received in support of energy risk management activities 37 81
Accrued interest expense 156 180
Current liabilities - held for sale 72 0
Other accrued expenses and other current liabilities 734 810
Other accrued expenses and other current liabilities - affiliate 161 0
Current liabilities - discontinued operations 0 1,210
Total current liabilities 3,317 4,702
Other Liabilities    
Long-term debt and capital leases 15,716 15,957
Nuclear decommissioning reserve 269 287
Nuclear decommissioning trust liability 415 339
Postretirement and other benefit obligations 458 510
Deferred income taxes 21 20
Derivative instruments 197 284
Out-of-market contracts, net 207 230
Non-current liabilities held-for-sale 8 11
Other non-current liabilities 664 666
Non-current liabilities - discontinued operations 0 3,184
Total non-current liabilities 17,955 21,488
Total Liabilities 21,272 26,190
Redeemable noncontrolling interest in subsidiaries 78 46
Commitments and Contingencies
Stockholders' Equity    
Common stock; $0.01 par value; 500,000,000 shares authorized; 418,323,134 and 417,583,825 shares issued; and 316,743,089 and 315,443,011 shares outstanding at December 31, 2017 and 2016 4 4
Additional paid-in capital 8,376 8,358
Accumulated deficit (6,268) (3,787)
Treasury stock, at cost; 101,580,045 and 102,140,814 shares at December 31, 2017 and 2016 (2,386) (2,399)
Accumulated other comprehensive loss (72) (135)
Noncontrolling interest 2,314 2,405
Total Stockholders' Equity 1,968 4,446
Total Liabilities and Stockholders' Equity $ 23,318 $ 30,682