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Non-Cash Compensation Plans Unit-based compensation Narrative (Details)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2018
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount   $ 0 $ 0 $ (1,812)
ET Unit Based Compensation Plans [Member]        
Weighted Average Grant-Date Fair Value Per Unit, Awards granted | $ / shares   $ 12.51 $ 13.00 $ 17.01
Fair Value Of Units As Of The Vesting Date   $ 47 $ 49 $ 40
Unvested awards | shares   28.0 22.4  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 258    
Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Term   2 years 7 months 6 days    
Subsidiary Unit Based Compensation [Member]        
Fair Value Of Units As Of The Vesting Date   $ 17 $ 22 $ 9
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 57    
Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Term   3 years 7 months 6 days    
ETE Merger [Member]        
Stockholders' Equity Note, Stock Split, Conversion Ratio 1.28