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Reportable Segments Reportable Segments (Segment Adjusted EBITDA) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]                        
Segment Adjusted EBITDA                   $ 9,510 $ 7,320 $ 6,135
Depreciation, depletion and amortization                   (2,859) (2,554) (2,216)
Interest expense, net of interest capitalized                   (2,055) (1,922) (1,804)
Gains on acquisitions                   0 0 83
Impairment losses                   (431) (1,039) (1,040)
Gains (losses) on interest rate derivatives                   47 (37) (12)
Unrealized gains (losses) on commodity risk management activities                   (105) (99) (70)
Non-cash compensation expense                   11 (59) 136
Losses on extinguishments of debt                   (112) (89) 0
Adjusted EBITDA related to unconsolidated affiliates                   (85) 24 97
Equity in earnings of unconsolidated affiliates                   25 (223) (199)
Impairment of investments in unconsolidated affiliates $ (313) $ (308)               0 (313) (308)
Impairment of investments in unconsolidated affiliates                   (655) (716) (675)
Equity in earnings of unconsolidated affiliates                   344 144 270
Other, net                   21 155 79
Income from continuing operations before income tax (expense) benefit                   3,634 710 204
Income tax expense (benefit) from continuing operations                   (4) 1,833 258
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent   852 $ 1,393 $ 659 $ 726 $ 1,158 $ 741 $ 314 $ 330 3,630 2,543 462
Loss from discontinued operations, net of income taxes                   (265) (177) (462)
Net income   $ 852 $ 1,391 $ 633 $ 489 $ 1,168 $ 758 $ 121 $ 319 3,365 2,366 0
Intrastate Transportation And Storage [Member]                        
Segment Reporting Information [Line Items]                        
Segment Adjusted EBITDA                   927 626 613
Depreciation, depletion and amortization                   (169) (147) (144)
Equity in earnings of unconsolidated affiliates                   19 (156) 35
Investment In Sunoco LP [Member]                        
Segment Reporting Information [Line Items]                        
Segment Adjusted EBITDA                   638 732 665
Depreciation, depletion and amortization                   (167) (169) (176)
Investment In USAC [Member]                        
Segment Reporting Information [Line Items]                        
Segment Adjusted EBITDA                   289 0 0
Depreciation, depletion and amortization                   (169) 0 0
Corporate and Other [Member]                        
Segment Reporting Information [Line Items]                        
Segment Adjusted EBITDA                   40 187 97
Interstate Transportation and Storage [Member]                        
Segment Reporting Information [Line Items]                        
Segment Adjusted EBITDA                   1,680 1,274 1,297
Depreciation, depletion and amortization                   (334) (254) (246)
Equity in earnings of unconsolidated affiliates                   227 236 193
Midstream [Member]                        
Segment Reporting Information [Line Items]                        
Segment Adjusted EBITDA                   1,627 1,481 1,133
Depreciation, depletion and amortization                   (1,006) (954) (840)
Equity in earnings of unconsolidated affiliates                   26 20 19
NGL and refined products transportation and services [Member]                        
Segment Reporting Information [Line Items]                        
Segment Adjusted EBITDA                   1,979 1,641 1,496
Depreciation, depletion and amortization                   (466) (401) (355)
Equity in earnings of unconsolidated affiliates                   64 33 41
Crude oil transportation and services [Member]                        
Segment Reporting Information [Line Items]                        
Segment Adjusted EBITDA                   2,330 1,379 834
Depreciation, depletion and amortization                   (445) (402) (251)
Equity in earnings of unconsolidated affiliates                   $ 6 $ 4 $ (4)