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Recent Accounting Pronouncements and Accounting Changes - Schedule of Effects of Accounting Standards Adoption and Accounting Changes on Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Current assets:      
Prepaid expenses and other current assets $ 66 $ 73 $ 76
Total currents assets 1,327 1,290 1,293
Property, plant and equipment, net 2,356 2,456 2,430
Other long-term assets 279 333 277
Total assets 3,962 4,079 4,000
Current liabilities:      
Other current liabilities 200 192 176
Total current liabilities 590 512 496
Long-term debt and finance lease obligations 1,190 1,190 1,167
Other long-term liabilities 52 54 14
Total long-term liabilities 1,647 1,624 1,561
Equity:      
Total liabilities and equity 3,962 4,079 $ 4,000
Finance lease, liability $ 67    
Topic 842      
Current assets:      
Prepaid expenses and other current assets   (3)  
Total currents assets   (3)  
Property, plant and equipment, net   26  
Other long-term assets   56  
Total assets   79  
Current liabilities:      
Other current liabilities   16  
Total current liabilities   16  
Long-term debt and finance lease obligations   23  
Other long-term liabilities   40  
Total long-term liabilities   63  
Equity:      
Total liabilities and equity   79  
Finance lease, right-of-use asset   26  
Finance lease, liability   $ 23