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Business Segments and Related Information, Segment Reporting Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Information by business segment [Abstract]          
Segment gross operating margin $ 2,448 $ 2,320 $ 7,382 $ 6,815  
Revenues from third parties 13,759 11,980 41,976 35,049  
Revenues from related parties 16 18 42 44  
Intersegment and intrasegment revenues 0 0 0 0  
Total revenues 13,775 11,998 42,018 35,093  
Equity in income of unconsolidated affiliates 99 122 302 347  
Property, plant and equipment, net 48,099   48,099   $ 45,804
Investments in unconsolidated affiliates 2,268   2,268   2,330
Intangible assets, net 3,619   3,619   3,770
Goodwill 5,608   5,608   5,608
Segment assets 59,594   59,594   57,512
NGL Pipelines & Services [Member]          
Information by business segment [Abstract]          
Total revenues 4,831 3,757 14,236 12,375  
Equity in income of unconsolidated affiliates 27 32 84 101  
Investments in unconsolidated affiliates 597   597   612
Intangible assets, net 797   797   828
Crude Oil Pipelines & Services [Member]          
Information by business segment [Abstract]          
Total revenues 5,251 5,365 16,554 13,850  
Equity in income of unconsolidated affiliates 70 89 212 241  
Investments in unconsolidated affiliates 1,634   1,634   1,681
Intangible assets, net 1,595   1,595   1,673
Natural Gas Pipelines & Services [Member]          
Information by business segment [Abstract]          
Total revenues 649 884 2,115 2,874  
Equity in income of unconsolidated affiliates 2 1 5 4  
Investments in unconsolidated affiliates 34   34   33
Intangible assets, net 1,121   1,121   1,158
Petrochemical & Refined Products Services [Member]          
Information by business segment [Abstract]          
Total revenues 3,044 1,992 9,113 5,994  
Equity in income of unconsolidated affiliates 0 0 1 1  
Investments in unconsolidated affiliates 3   3   4
Intangible assets, net 106   106   111
Reportable Business Segments [Member] | NGL Pipelines & Services [Member]          
Information by business segment [Abstract]          
Segment gross operating margin 1,335 1,196 4,000 3,518  
Revenues from third parties 4,828 3,754 14,227 12,367  
Revenues from related parties 3 3 9 8  
Intersegment and intrasegment revenues 11,044 12,367 34,157 34,347  
Total revenues 15,875 16,124 48,393 46,722  
Equity in income of unconsolidated affiliates 27 32 84 101  
Property, plant and equipment, net 17,784   17,784   17,541
Investments in unconsolidated affiliates 597   597   612
Intangible assets, net 797   797   828
Goodwill 2,811   2,811   2,811
Segment assets 21,989   21,989   21,792
Reportable Business Segments [Member] | Crude Oil Pipelines & Services [Member]          
Information by business segment [Abstract]          
Segment gross operating margin 401 432 1,229 1,251  
Revenues from third parties 5,241 5,354 16,530 13,825  
Revenues from related parties 10 11 24 25  
Intersegment and intrasegment revenues 13,678 16,343 42,547 41,139  
Total revenues 18,929 21,708 59,101 54,989  
Equity in income of unconsolidated affiliates 70 89 212 241  
Property, plant and equipment, net 6,374   6,374   6,627
Investments in unconsolidated affiliates 1,634   1,634   1,681
Intangible assets, net 1,595   1,595   1,673
Goodwill 1,841   1,841   1,841
Segment assets 11,444   11,444   11,822
Reportable Business Segments [Member] | Natural Gas Pipelines & Services [Member]          
Information by business segment [Abstract]          
Segment gross operating margin 349 239 954 791  
Revenues from third parties 646 880 2,106 2,863  
Revenues from related parties 3 4 9 11  
Intersegment and intrasegment revenues 166 133 481 386  
Total revenues 815 1,017 2,596 3,260  
Equity in income of unconsolidated affiliates 2 1 5 4  
Property, plant and equipment, net 10,256   10,256   10,019
Investments in unconsolidated affiliates 34   34   33
Intangible assets, net 1,121   1,121   1,158
Goodwill 0   0   0
Segment assets 11,411   11,411   11,210
Reportable Business Segments [Member] | Petrochemical & Refined Products Services [Member]          
Information by business segment [Abstract]          
Segment gross operating margin 363 453 1,199 1,255  
Revenues from third parties 3,044 1,992 9,113 5,994  
Revenues from related parties 0 0 0 0  
Intersegment and intrasegment revenues 6,944 4,307 18,982 13,108  
Total revenues 9,988 6,299 28,095 19,102  
Equity in income of unconsolidated affiliates 0 0 1 1  
Property, plant and equipment, net 10,146   10,146   9,372
Investments in unconsolidated affiliates 3   3   4
Intangible assets, net 106   106   111
Goodwill 956   956   956
Segment assets 11,211   11,211   10,443
Eliminations [Member]          
Information by business segment [Abstract]          
Revenues from third parties 0 0 0 0  
Revenues from related parties 0 0 0 0  
Intersegment and intrasegment revenues (31,832) (33,150) (96,167) (88,980)  
Total revenues (31,832) (33,150) (96,167) (88,980)  
Equity in income of unconsolidated affiliates 0 $ 0 0 $ 0  
Adjustments [Member]          
Information by business segment [Abstract]          
Property, plant and equipment, net 3,539   3,539   2,245
Investments in unconsolidated affiliates 0   0   0
Intangible assets, net 0   0   0
Goodwill 0   0   0
Segment assets $ 3,539   $ 3,539   $ 2,245