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Related Party Transactions Affiliated Balances (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
RELATED PARTY ASSETS      
Accounts receivable, net $ 48 $ 34  
Other current assets 2 8  
Deferred charges and other assets 55 23  
Total Assets 105 65  
RELATED PARTY LIABILITIES [Abstract]      
Current portion of debt 6 6  
Accounts payable 26 18  
Other current liabilities 7 4  
Long-term debt 148 155  
Other long-term liabilities and deferred credits 34 35  
Total Liabilities 221 218  
RELATED PARTY REVENUES [Abstract]      
Total Revenues 14,144 13,705 $ 13,058
RELATED PARTY COST OF SALES [Abstract]      
Costs of sales 4,421 4,345 3,429
Other Operating Income (Expense), Net 3 1 1
Affiliated Entity [Member]      
RELATED PARTY REVENUES [Abstract]      
Total Revenues 265 162 142
RELATED PARTY COST OF SALES [Abstract]      
Costs of sales 63 20 38
Other Operating Income (Expense), Net (91) (100) (75)
Services [Member]      
RELATED PARTY REVENUES [Abstract]      
Total Revenues 7,931 7,901 8,146
Services [Member] | Affiliated Entity [Member]      
RELATED PARTY REVENUES [Abstract]      
Total Revenues 171 73 71
Revenues—Product sales and other      
RELATED PARTY REVENUES [Abstract]      
Total Revenues 2,932 2,751 2,458
Revenues—Product sales and other | Affiliated Entity [Member]      
RELATED PARTY REVENUES [Abstract]      
Total Revenues $ 94 $ 89 $ 71