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Non-Cash Compensation Plans Subsidiary Unit-Based Compensation Plans (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Subsidiary Unit Based Compensation [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
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    
Sunoco LP Unit Based Compensation Plans [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested awards 2.1 2.1  
Weighted Average Grant-Date Fair Value Per Unit $ 29.21 $ 29.15  
Awards granted 0.7    
Weighted Average Grant-Date Fair Value Per Unit, Awards granted $ 30.70 $ 27.67 $ 28.31
Awards vested (0.5)    
Weighted Average Grant-Date Fair Value Per Unit, Awards vested $ 30.04    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 0.2    
Weighted Average Grant-Date Fair Value Per Unit, Awards forfeited $ 28.16    
USAC Unit Based Compensation Plans [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested awards 1.8 1.4  
Weighted Average Grant-Date Fair Value Per Unit $ 15.09 $ 14.98  
Awards granted 0.7    
Weighted Average Grant-Date Fair Value Per Unit, Awards granted $ 15.88 $ 15.47  
Awards vested (0.3)    
Weighted Average Grant-Date Fair Value Per Unit, Awards vested $ 13.06    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 0.0    
Weighted Average Grant-Date Fair Value Per Unit, Awards forfeited $ 16.78