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CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents, consolidated VIEs $ 702 $ 482
Prepaid expenses and other current assets, VIEs 47 43
Property, plant and equipment, net of accumulated depreciation, VIEs 2,441 2,572
Other long-term assets, VIEs 171 141
Current liabilities:    
Accounts payable, VIEs 409 334
Other current liabilities, VIEs 193 208
Long-term liabilities:    
Other long-term liabilities, VIEs $ 22 $ 9
Equity:    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, authorized (in shares) 350,000,000 350,000,000
Common stock, issued (in shares) 100,629,209 86,929,660
Treasury stock (in shares) 98,610 98,610
Variable Interest Entities    
Current assets:    
Cash and cash equivalents, consolidated VIEs $ 460 $ 223
Prepaid expenses and other current assets, VIEs 35 30
Property, plant and equipment, net of accumulated depreciation, VIEs 2,425 2,548
Other long-term assets, VIEs 162 137
Current liabilities:    
Accounts payable, VIEs 407 329
Other current liabilities, VIEs 164 181
Long-term liabilities:    
Other long-term liabilities, VIEs $ 10 $ 4