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Debt Obligations Debt Obligations (Interest Rates & Maturities) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Jan. 31, 2019
Dec. 31, 2018
Parent Company [Member]          
Deferred Finance Costs, Noncurrent, Net $ 0       $ 27
ETO [Member]          
Deferred Finance Costs, Noncurrent, Net 207       178
Panhandle [Member]          
Debt Instrument, Interest Rate, Stated Percentage   8.125%      
Sunoco LP [Member]          
Deferred Finance Costs, Noncurrent, Net 26       23
Transwestern [Member]          
Deferred Finance Costs, Noncurrent, Net $ 1       $ 1
5.80% Senior Notes due 2038 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 5.80%        
Debt Instrument, Maturity Date Jul. 01, 2038        
ETE 7.5% Senior Notes due 2020 [Member] | Parent Company [Member]          
Debt Instrument, Interest Rate, Stated Percentage 7.50%        
Debt Instrument, Maturity Date Oct. 15, 2020        
5.875% Senior Notes due January 15, 2024 [Member] | Parent Company [Member]          
Debt Instrument, Interest Rate, Stated Percentage 5.88%        
Debt Instrument, Maturity Date Jan. 15, 2024        
5.875% Senior Notes due January 15, 2024 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 5.88%   5.875%    
Debt Instrument, Maturity Date Jan. 15, 2024        
5.5% Senior Notes due June 1, 2027 [Member] | Parent Company [Member]          
Debt Instrument, Interest Rate, Stated Percentage 5.50%        
Debt Instrument, Maturity Date Jun. 01, 2027        
5.5% Senior Notes due June 1, 2027 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 5.50%   5.50%    
Debt Instrument, Maturity Date Jun. 01, 2027        
4.25% Senior Notes due March 15, 2023 [Member] | Parent Company [Member]          
Debt Instrument, Interest Rate, Stated Percentage 4.25%        
Debt Instrument, Maturity Date Mar. 15, 2023        
4.25% Senior Notes due March 15, 2023 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 4.25%   4.25%    
Debt Instrument, Maturity Date Mar. 15, 2023        
4.20% Senior Notes due 2023 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 4.20%        
Debt Instrument, Maturity Date Sep. 15, 2023        
9.7% Senior Notes, due March 15, 2019 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 9.70%     9.70%  
Debt Instrument, Maturity Date Mar. 15, 2019        
9.0% Senior Notes due April 15, 2019 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 9.00%     9.00%  
Debt Instrument, Maturity Date Apr. 15, 2019        
4.15% Senior Notes due October 1, 2020 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 4.15%        
Debt Instrument, Maturity Date Oct. 01, 2020        
7.50% Senior Notes Due 2020 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 7.50%   7.50%    
Debt Instrument, Maturity Date Oct. 15, 2020        
Senior Notes 4.65% Due June 1, 2021 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 4.65%        
Debt Instrument, Maturity Date Jun. 01, 2021        
Senior Notes 5.20% Due February 1, 2022 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 5.20%        
Debt Instrument, Maturity Date Feb. 01, 2022        
3.6% Senior Notes due February 1, 2023 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 3.60%        
Debt Instrument, Maturity Date Feb. 01, 2023        
4.9% Senior Notes due February 1, 2024 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 4.90%        
Debt Instrument, Maturity Date Feb. 01, 2024        
4.90% Senior Notes due March 2035 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 4.90%        
Debt Instrument, Maturity Date Mar. 15, 2035        
7.5% Senior Notes, due July 1, 2038 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 7.50%        
Debt Instrument, Maturity Date Jul. 01, 2038        
Senior Notes 6.05% Due June 1, 2041 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 6.85%        
Debt Instrument, Maturity Date Jun. 01, 2041        
Senior Notes 6.50% Due February 1, 2042 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 6.05%        
Debt Instrument, Maturity Date Feb. 01, 2042        
5.15% Senior Notes due February 1, 2043 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 4.95%        
Debt Instrument, Maturity Date Feb. 01, 2043        
5.95% Senior Notes due October 1, 2043 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 5.15%        
Debt Instrument, Maturity Date Oct. 01, 2043        
5.15% Senior Notes due March 2045 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 5.30%        
Debt Instrument, Maturity Date Mar. 15, 2045        
6.125% Senior Notes due December 2045 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 5.35%        
Debt Instrument, Maturity Date May 15, 2045        
5.30% Senior Notes due April 2047 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 6.13%        
Debt Instrument, Maturity Date Apr. 01, 2047        
5.40% Senior Notes due October 1, 2047 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 5.30%        
Debt Instrument, Maturity Date Oct. 01, 2047        
6.0% Senior Notes due 2048 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 6.00%        
Debt Instrument, Maturity Date Jun. 15, 2048        
6.25% Senior Notes due 2049 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 6.25%     6.25%  
Debt Instrument, Maturity Date Apr. 15, 2049        
8.125% Senior Notes, due June 1, 2019 [Member] | Panhandle [Member]          
Debt Instrument, Interest Rate, Stated Percentage 8.13%     8.125%  
Debt Instrument, Maturity Date Jun. 01, 2019        
7.00% Senior Notes, due July 15, 2029 [Member] | Panhandle [Member]          
Debt Instrument, Interest Rate, Stated Percentage 7.00%        
Debt Instrument, Maturity Date Jul. 15, 2029        
5.75% Senior Notes due September 1, 2020 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 5.75%        
Debt Instrument, Maturity Date Sep. 01, 2020        
5.875% Senior Notes due April 1, 2022 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 5.88%        
Debt Instrument, Maturity Date Mar. 01, 2022        
4.5% Senior Notes due November 1, 2023 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 4.50%        
Debt Instrument, Maturity Date Nov. 01, 2023        
5.0% Senior Notes due October 1, 2022 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 5.00%        
Debt Instrument, Maturity Date Oct. 01, 2022        
7.60% Senior Notes, due February 1, 2024 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 7.60%        
Debt Instrument, Maturity Date Feb. 01, 2024        
7.60% Senior Notes, due February 1, 2024 [Member] | Panhandle [Member]          
Debt Instrument, Interest Rate, Stated Percentage 7.60%        
Debt Instrument, Maturity Date Feb. 01, 2024        
4.05% Senior Notes due March 2025 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 4.05%        
Debt Instrument, Maturity Date Mar. 15, 2025        
4.75% Senior Notes due January 2026 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 4.75%        
Debt Instrument, Maturity Date Jan. 15, 2026        
8.25% Senior Notes, due November 14, 2029 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 8.25%        
Debt Instrument, Maturity Date Nov. 15, 2029        
8.25% Senior Notes, due November 14, 2029 [Member] | Panhandle [Member]          
Debt Instrument, Interest Rate, Stated Percentage 8.20%        
Debt Instrument, Maturity Date Nov. 15, 2029        
7.2% Junior Subordinated Notes due November 21, 2066 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 5.40%        
9.00% Debentures, due 2024 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 9.00%        
Debt Instrument, Maturity Date Nov. 01, 2024        
5.50% Senior Notes, due February 15, 2020 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 5.50%        
Debt Instrument, Maturity Date Feb. 15, 2020        
4.40% Senior Notes due April 2021 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 4.40%        
Debt Instrument, Maturity Date Apr. 01, 2021        
Senior Note 4.65% Due February 15, 2022 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 4.65%        
Debt Instrument, Maturity Date Feb. 15, 2022        
3.45% Senior Notes due January 2023 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 3.45%        
Debt Instrument, Maturity Date Feb. 01, 2023        
4.25% Senior Notes due April 1, 2024 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 4.25%        
Debt Instrument, Maturity Date Apr. 01, 2024        
5.95% Senior Notes due December 2025 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 5.95%        
Debt Instrument, Maturity Date Dec. 01, 2025        
3.90% Senior Notes due July 15, 2026 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 3.90%        
Debt Instrument, Maturity Date Jul. 15, 2026        
4.20% Senior Notes due April 2027 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 4.20%        
Debt Instrument, Maturity Date Apr. 15, 2027        
4.00% Senior Notes due October 1, 2027 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 4.00%        
Debt Instrument, Maturity Date Oct. 01, 2027        
4.95% Senior Notes due 2028 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 4.95%        
Debt Instrument, Maturity Date Jun. 15, 2028        
5.25% Senior Notes due 2029 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 5.25%     5.25%  
Debt Instrument, Maturity Date Apr. 15, 2029        
6.85% Senior Notes, due February 15, 2040 [Member] | ETO [Member]          
Debt Instrument, Maturity Date Feb. 15, 2040        
Senior Note 6.10%, due February 15, 2042 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 6.50%        
Debt Instrument, Maturity Date Feb. 15, 2042        
4.95% Senior Notes due January 2043 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 6.10%        
Debt Instrument, Maturity Date Jan. 15, 2043        
5.30% Senior Notes due April 1, 2044 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 5.95%        
Debt Instrument, Maturity Date Apr. 01, 2044        
5.35% Senior Notes due May 15, 2045 [Member] | ETO [Member]          
Debt Instrument, Interest Rate, Stated Percentage 5.15%        
Debt Instrument, Maturity Date Dec. 15, 2045        
5.36% Senior Unsecured Notes, due December 9, 2020 [Member] | Transwestern [Member]          
Debt Instrument, Interest Rate, Stated Percentage 5.36%        
Debt Instrument, Maturity Date Dec. 09, 2020        
5.89% Senior Unsecured Notes, due May 24, 2022 [Member] | Transwestern [Member]          
Debt Instrument, Interest Rate, Stated Percentage 5.89%        
Debt Instrument, Maturity Date May 24, 2022        
5.66% Senior Unsecured Notes, due December 9, 2024 [Member] | Transwestern [Member]          
Debt Instrument, Interest Rate, Stated Percentage 5.66%        
Debt Instrument, Maturity Date Dec. 09, 2024        
6.16% Senior Unsecured Notes, due May 24, 2037 [Member] | Transwestern [Member]          
Debt Instrument, Interest Rate, Stated Percentage 6.16%        
Debt Instrument, Maturity Date May 24, 2037        
6.875% Senior notes due April 2026 [Member] | Transwestern [Member]          
Debt Instrument, Interest Rate, Stated Percentage 6.88%        
Debt Instrument, Maturity Date Apr. 01, 2026        
3.625% Senior Notes due 2022 [Member] | Bakken Pipeline [Member]          
Debt Instrument, Interest Rate, Stated Percentage 3.63%        
Debt Instrument, Maturity Date Apr. 01, 2022        
3.90% Senior Notes due 2024 [Member] | Bakken Pipeline [Member]          
Debt Instrument, Interest Rate, Stated Percentage 3.90%        
Debt Instrument, Maturity Date Apr. 01, 2024        
4.625% Senior Notes due 2029 [Member] | Bakken Pipeline [Member]          
Debt Instrument, Interest Rate, Stated Percentage 4.63%        
Debt Instrument, Maturity Date Apr. 01, 2029        
4.875% senior notes due 2023 [Member] | Sunoco LP [Member]          
Debt Instrument, Interest Rate, Stated Percentage 4.88%        
Debt Instrument, Maturity Date Jan. 15, 2023        
5.5% Senior Notes due August 2020 [Member] | Sunoco LP [Member]          
Debt Instrument, Interest Rate, Stated Percentage 5.50%        
Debt Instrument, Maturity Date Feb. 15, 2026        
6.00% Senior Notes due April 15, 2027 [Member] | Sunoco LP [Member]          
Debt Instrument, Interest Rate, Stated Percentage 6.00%        
Debt Instrument, Maturity Date Apr. 15, 2027        
5.875% senior notes due 2028 [Member] | Sunoco LP [Member]          
Debt Instrument, Interest Rate, Stated Percentage 5.88%        
Debt Instrument, Maturity Date Mar. 15, 2028        
6.875% Senior Notes due September 2027 [Member] | Transwestern [Member]          
Debt Instrument, Interest Rate, Stated Percentage 6.88%        
Debt Instrument, Maturity Date Sep. 01, 2027