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Related Party Transactions Affiliated Balances (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
RELATED PARTY ASSETS      
Other current assets $ 238 $ 337  
Deferred charges and other assets 1,582 1,522  
RELATED PARTY LIABILITIES [Abstract]      
Other current liabilities 1,101 1,085  
RELATED PARTY REVENUES [Abstract]      
Services 7,901 8,146 $ 8,290
Product sales and other 2,751 2,458 3,274
Total Revenues 13,705 13,058 14,403
RELATED PARTY COST OF SALES [Abstract]      
Costs of sales 4,345 3,429 4,059
Other operating expenses 12 386 2,066
Affiliated Entity [Member]      
RELATED PARTY ASSETS      
Accounts receivable, net 34 37  
Other current assets 8 0  
Deferred charges and other assets 23 10  
Total Assets 65 47  
RELATED PARTY LIABILITIES [Abstract]      
Current portion of debt 6 6  
Accounts payable 18 28  
Other current liabilities 4 9  
Long-term debt 155 161  
Other long-term liabilities and deferred credits 35 29  
Total Liabilities 218 233  
RELATED PARTY REVENUES [Abstract]      
Services 73 71 72
Product sales and other 89 71 71
Total Revenues 162 142 143
RELATED PARTY COST OF SALES [Abstract]      
Costs of sales 20 38 60
Other operating expenses $ 100 $ 75 $ 55