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Investments in Affiliates (Summarized Income Statement Information) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]                      
Revenues $ 10,034 $ 9,955 $ 7,338 $ 11,627 $ 13,720 $ 13,495 $ 13,877 $ 13,121 $ 38,954 $ 54,213 $ 54,087
Net income (loss) $ 833 $ (401) $ 672 $ (964) $ 1,276 $ 1,161 $ 1,208 $ 1,180 140 4,825 3,420
Equity in earnings of unconsolidated affiliates                 119 302 344
Equity Method Investments [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Revenues                 1,243 1,192 1,249
Equity Method Investments Summarized Financial Information, Operating Income                 6 683 723
Net income (loss)                 (199) 443 460
Citrus [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Equity in earnings of unconsolidated affiliates                 162 148 141
FEP [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Equity in earnings of unconsolidated affiliates [1]                 (139) 59 55
MEP [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Equity in earnings of unconsolidated affiliates                 (6) 15 31
Other Affiliates [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Equity in earnings of unconsolidated affiliates                 82 76 117
White Cliffs                      
Schedule of Equity Method Investments [Line Items]                      
Equity in earnings of unconsolidated affiliates                 $ 20 $ 4 $ 0
[1] For the year ended December 31, 2020, equity in earnings (losses) of unconsolidated affiliates includes the impact of non-cash impairments recorded by FEP, which reduced the Partnership’s equity in earnings by $208 million.