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Business Segments - Segment Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Segment Reporting Information [Line Items]            
Total operating revenues $ 1,841   $ 4,269   $ 4,567 $ 7,644
Gross margin 429   625   927 925
Operating and maintenance expense (229)   (189)   (426) (341)
Depreciation and amortization expense (91)   (90)   (181) (180)
General and administrative expense (68)   (65)   (148) (120)
Asset Impairments 0   (1)   0 (1)
Other expense, net 0   8   0 8
Loss on sale of assets, net (3)   0   (3) 7
Restructuring Costs (16)   0   (26) 0
Earnings from unconsolidated affiliates 148   168   308 311
Interest expense, net (75)   (70)   (143) (141)
Income tax expense 0   (2)   (1) (3)
Net income 95 $ 212 384 $ 81 307 465
Net income attributable to noncontrolling interests (1)   (1)   (2) (2)
Net income attributable to partners 94   383   305 463
Non-cash derivative mark-to-market 7   101   47 (75)
Non-cash lower of cost or net realizable value adjustment         22 0
Capital expenditures 82   37   163 60
Investments in unconsolidated affiliates, net     0     1
Logistics and Marketing            
Segment Reporting Information [Line Items]            
Total operating revenues 1,561   3,789   3,953 6,952
Gathering and Processing            
Segment Reporting Information [Line Items]            
Total operating revenues 1,252   2,967   3,018 5,073
Eliminations            
Segment Reporting Information [Line Items]            
Total operating revenues (972)   (2,487)   (2,404) (4,381)
Operating Segments | Logistics and Marketing            
Segment Reporting Information [Line Items]            
Total operating revenues 1,561   3,789   3,953 6,952
Gross margin 58   40   112 56
Operating and maintenance expense (8)   (9)   (17) (17)
Depreciation and amortization expense (4)   (3)   (6) (6)
General and administrative expense (1)   (2)   (3) (3)
Asset Impairments     0     0
Other expense, net     10     10
Loss on sale of assets, net 0       0 0
Restructuring Costs 0       0  
Earnings from unconsolidated affiliates 147   165   301 302
Interest expense, net 0   0   0 0
Income tax expense     0   0 0
Net income 192   201   387 342
Net income attributable to noncontrolling interests 0   0   0 0
Net income attributable to partners 192   201   387 342
Non-cash derivative mark-to-market 17   26   12 (19)
Non-cash lower of cost or net realizable value adjustment 0       22  
Capital expenditures 1   4   1 6
Investments in unconsolidated affiliates, net     0     0
Operating Segments | Gathering and Processing            
Segment Reporting Information [Line Items]            
Total operating revenues 1,252   2,967   3,018 5,073
Gross margin 371   585   815 869
Operating and maintenance expense (216)   (175)   (398) (315)
Depreciation and amortization expense (84)   (82)   (168) (163)
General and administrative expense (4)   (5)   (8) (9)
Asset Impairments     (1)     (1)
Other expense, net     (2)     (2)
Loss on sale of assets, net (3)       (3) 7
Restructuring Costs 0       0  
Earnings from unconsolidated affiliates 1   3   7 9
Interest expense, net 0   0   0 0
Income tax expense     0   0 0
Net income 65   323   245 395
Net income attributable to noncontrolling interests (1)   (1)   (2) (2)
Net income attributable to partners 64   322   243 393
Non-cash derivative mark-to-market (10)   75   35 (56)
Non-cash lower of cost or net realizable value adjustment         0  
Capital expenditures 81   31   160 51
Investments in unconsolidated affiliates, net     0     1
Other            
Segment Reporting Information [Line Items]            
Total operating revenues 0   0   0 0
Gross margin 0   0   0 0
Operating and maintenance expense (5)   (5)   (11) (9)
Depreciation and amortization expense (3)   (5)   (7) (11)
General and administrative expense (63)   (58)   (137) (108)
Asset Impairments     0     0
Other expense, net     0     0
Loss on sale of assets, net 0       0 0
Restructuring Costs (16)       (26)  
Earnings from unconsolidated affiliates 0   0   0 0
Interest expense, net (75)   (70)   (143) (141)
Income tax expense     (2)   (1) (3)
Net income (162)   (140)   (325) (272)
Net income attributable to noncontrolling interests 0   0   0 0
Net income attributable to partners (162)   (140)   (325) (272)
Non-cash derivative mark-to-market 0   0   0 0
Non-cash lower of cost or net realizable value adjustment         0  
Capital expenditures 0   2   2 3
Investments in unconsolidated affiliates, net     0     0
Eliminations            
Segment Reporting Information [Line Items]            
Total operating revenues (972)   (2,487)   (2,404) (4,381)
Gross margin 0   0   0 0
Operating and maintenance expense           0
Depreciation and amortization expense 0   0   0 0
General and administrative expense 0   0   0 0
Asset Impairments           0
Other expense, net           0
Loss on sale of assets, net 0       0  
Restructuring Costs 0       0  
Earnings from unconsolidated affiliates 0   0   0 0
Interest expense, net 0   0   0 0
Income tax expense     0   0 0
Net income 0   0   0 0
Net income attributable to noncontrolling interests 0   0   0 0
Net income attributable to partners 0   0   0 0
Non-cash derivative mark-to-market 0   0   0 0
Non-cash lower of cost or net realizable value adjustment         0  
Capital expenditures $ 0   0   $ 0 0
Investments in unconsolidated affiliates, net     $ 0     $ 0