| Accrued Liabilities | 3 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Mar. 31, 2018 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accrued Liabilities, Current [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accrued Liabilities | ACCRUED LIABILITIES  
As of March 31, 2018 and December 31, 2017, accrued liabilities consisted of the following (in millions):
 
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- Definition The entire disclosure for accounts payable and accrued liabilities at the end of the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- References No definition available. 
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