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Supplemental Disclosure of Cash Flow Information - Supplemental Disclosure of Cash Flow Information (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Interest, net of capitalized interest $ 129 $ 131            
Income Taxes Paid, Net 1 1            
Accounts payable related to capital expenditures 9 26            
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 7,076 7,540 $ 7,317 $ 7,352 $ 7,409 $ 7,559 $ 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 $ 6,695 $ 7,145 $ 6,937 $ 6,972 7,013 $ 7,163 $ 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)