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Advances to and Investments in Unconsolidated Affiliates Investment in Affiliates (Carrying Values) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Investments in unconsolidated affiliates $ 3,097 $ 2,893 $ 2,947
Equity in earnings of unconsolidated affiliates 383 257 246
Other Affiliates [Member]      
Equity in earnings of unconsolidated affiliates 103 89 82
Citrus [Member]      
Investments in unconsolidated affiliates 1,811 1,800  
Equity in earnings of unconsolidated affiliates 146 141 157
MEP [Member]      
Investments in unconsolidated affiliates 332 360  
Equity in earnings of unconsolidated affiliates 87 10 (17)
White Cliffs      
Investments in unconsolidated affiliates 203 218  
Equity in earnings of unconsolidated affiliates 10 (8) 0
Other      
Investments in unconsolidated affiliates 684 446  
Explorer      
Investments in unconsolidated affiliates 67 69  
Equity in earnings of unconsolidated affiliates $ 37 $ 25 $ 24