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Supplemental Disclosure of Cash Flow Information - Supplemental Disclosure of Cash Flow Information (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Interest, net of capitalized interest $ 96 $ 95        
Income Taxes Paid, Net 1 1        
Accounts payable related to capital expenditures 8 31        
Lease liabilities related to (derecognition) recognition of right-of-use assets (5)          
Lease liabilities related to (derecognition) recognition of right-of-use assets   42        
Partners' Capital, Including Portion Attributable to Noncontrolling Interest 7,317 7,559 $ 7,352 $ 7,409 $ 7,583 $ 7,618
Common Unit [Member] | Partners' Capital            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Partners' Capital, Including Portion Attributable to Noncontrolling Interest $ 6,937 $ 7,163 $ 6,972 7,013 $ 7,183 $ 7,218
Cumulative Effect, Period of Adoption, Adjustment            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Partners' Capital, Including Portion Attributable to Noncontrolling Interest       (3)    
Cumulative Effect, Period of Adoption, Adjustment | Common Unit [Member] | Partners' Capital            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Partners' Capital, Including Portion Attributable to Noncontrolling Interest       $ (3)