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Equity Equity (Policies)
3 Months Ended
Mar. 31, 2019
Equity [Abstract]  
Consolidation, Subsidiary Stock Issuances, Policy [Policy Text Block]
Subsidiary Equity Transactions
The Parent Company accounts for the difference between the carrying amount of its investment in ETO, Sunoco LP, and USAC and the underlying book value arising from the issuance or redemption of units by ETO, Sunoco LP, and USAC (excluding transactions with the Parent Company) as capital transactions. As a result of these transactions, during the three months ended March 31, 2019, there was no decrease in partners’ capital.