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Acquisitions and Related Transactions Acquisitions (2017 Transactions) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2017
Jul. 31, 2017
Feb. 28, 2017
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Feb. 01, 2017
Business Acquisition [Line Items]              
Noncontrolling Interest, Increase from Sale of Parent Equity Interest   $ 988   $ 93      
Intangible assets, net       6,154   $ 6,000  
Property, Plant and Equipment, Net       $ 74,193 $ 66,962 $ 66,963  
ETO [Member] | Rover Contribution [Member]              
Business Acquisition [Line Items]              
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest 50.10%            
ETO [Member] | Holdco [Member] | Rover Contribution [Member]              
Business Acquisition [Line Items]              
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest   49.90%          
Permian Express Partners LLC [Member]              
Business Acquisition [Line Items]              
Percent of total equity ownership of a subsidiary   88.00%          
Intangible assets, net             $ 547
Property, Plant and Equipment, Net             $ 435
Holdco [Member] | Rover Pipeline LLC [Member] | Rover Contribution [Member]              
Business Acquisition [Line Items]              
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest   65.00%          
Blackstone [Member] | Rover Contribution [Member]              
Business Acquisition [Line Items]              
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest 49.90%            
Dakota Access and ETCOC [Member]              
Business Acquisition [Line Items]              
Percent of total equity ownership of a subsidiary   15.00%          
Phillips 66 Company [Member] | Dakota Access and ETCOC [Member]              
Business Acquisition [Line Items]              
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest     25.00%        
Bakken Holdings Company LLC [Member] | ETO [Member]              
Business Acquisition [Line Items]              
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest     100.00%        
Bakken Holdings Company LLC [Member] | Sunoco Logistics [Member]              
Business Acquisition [Line Items]              
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest     49.00%        
Bakken Holdings Company LLC [Member] | Bakken Pipeline Investments LLC [Member]              
Business Acquisition [Line Items]              
Business Acquisition, Percentage of Voting Interests Acquired             200000000000.00%
Bakken Pipeline Investments LLC [Member] | Dakota Access and ETCOC [Member]              
Business Acquisition [Line Items]              
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest     75.00%