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Reportable Segments (Advances to and investments in affiliates) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Investments in unconsolidated affiliates $ 2,893 $ 2,947 $ 3,060
Intrastate Transportation and Storage      
Segment Reporting Information [Line Items]      
Investments in unconsolidated affiliates 139 110 89
Interstate Transportation and Storage      
Segment Reporting Information [Line Items]      
Investments in unconsolidated affiliates 2,201 2,209 2,278
Midstream      
Segment Reporting Information [Line Items]      
Investments in unconsolidated affiliates 54 101 110
NGL and Refined Products Transportation and Services      
Segment Reporting Information [Line Items]      
Investments in unconsolidated affiliates 446 476 509
Crude Oil Transportation and Services      
Segment Reporting Information [Line Items]      
Investments in unconsolidated affiliates 0 0 22
All Other      
Segment Reporting Information [Line Items]      
Investments in unconsolidated affiliates $ 53 $ 51 $ 52