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Segment Disclosures (Tables)
 12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
Reconciliation of revenue from segment to consolidated [Table Text Block]
The following table reflects the reconciliation of Segment revenues to Total revenues as reported in the Consolidated Statement of Operations and Other financial information:
Transmission &
Gulf of Mexico		Northeast G&PWestOtherEliminationsTotal
(Millions)
2020
Segment revenues:
Service revenues
External
$3,207 $1,416 $1,280 $21 $— $5,924 
Internal
50 49 — 13 (112)— 
Total service revenues3,257 1,465 1,280 34 (112)5,924 
Total service revenues – commodity consideration
21 7 101 — — 129 
Product sales
External
144 16 1,506 — — 1,666 
Internal
47 41 56 — (144)— 
Total product sales191 57 1,562 — (144)1,666 
Total revenues$3,469 $1,529 $2,943 $34 $(256)$7,719 
Other financial information:
Additions to long-lived assets
$706 $137 $318 $122 $— $1,283 
Proportional Modified EBITDA of equity-method investments
166 473 110 — — 749 
2019
Segment revenues:
Service revenues
External
$3,261 $1,291 $1,364 $17 $— $5,933 
Internal
50 47 — 13 (110)— 
Total service revenues3,311 1,338 1,364 30 (110)5,933 
Total service revenues – commodity consideration41 12 150 — — 203 
Product sales
External
217 115 1,733 — — 2,065 
Internal
71 35 64 — (170)— 
Total product sales288 150 1,797 — (170)2,065 
Total revenues$3,640 $1,500 $3,311 $30 $(280)$8,201 
Other financial information:
Additions to long-lived assets
$1,341 $1,245 $304 $21 $— $2,911 
Proportional Modified EBITDA of equity-method investments
177 454 115 — — 746 
Transmission &
Gulf of Mexico		Northeast G&PWestOtherEliminationsTotal
(Millions)
2018
Segment revenues:
Service revenues
External$2,904 $935 $1,641 $22 $— $5,502 
Internal49 41 — 12 (102)— 
Total service revenues2,953 976 1,641 34 (102)5,502 
Total service revenues – commodity consideration59 20 321 — — 400 
Product sales
External174 245 2,365 — — 2,784 
Internal261 42 83 — (386)— 
Total product sales435 287 2,448 — (386)2,784 
Total revenues$3,447 $1,283 $4,410 $34 $(488)$8,686 
Other financial information:
Additions to long-lived assets
$2,379 $477 $279 $36 $— $3,171 
Proportional Modified EBITDA of equity-method investments
183 493 94 — — 770 
Reconciliation of Modified EBITDA to Net income (loss) [Table Text Block]
The following table reflects the reconciliation of Modified EBITDA to Net income (loss) as reported in the Consolidated Statement of Operations:
Year Ended December 31,
202020192018
(Millions)
Modified EBITDA by segment:
Transmission & Gulf of Mexico$2,379 $2,175 $2,293 
Northeast G&P1,489 1,314 1,086 
West998 952 38 
Other(15)6 (29)
4,851 4,447 3,388 
Accretion expense associated with asset retirement obligations for nonregulated operations
(35)(33)(33)
Depreciation and amortization expenses(1,721)(1,714)(1,725)
Impairment of goodwill(187)— — 
Equity earnings (losses)328 375 396 
Impairment of equity-method investments(1,046)(186)(32)
Other investing income (loss) – net8 107 219 
Proportional Modified EBITDA of equity-method investments
(749)(746)(770)
Interest expense(1,172)(1,186)(1,112)
(Provision) benefit for income taxes(79)(335)(138)
Income (loss) from discontinued operations— (15)— 
Net income (loss)$198 $714 $193 
Total assets and equity method investments by reporting segment [Table Text Block]
The following table reflects Total assets and Equity-method investments by reportable segments:
Total AssetsEquity-Method Investments
December 31, 2020December 31, 2019December 31, 2020December 31, 2019
(Millions)
Transmission & Gulf of Mexico$19,110 $18,796 $610 $741 
Northeast G&P14,569 15,399 3,682 3,973 
West10,558 11,265 867 1,521 
Other927 1,151 — — 
Eliminations (1)(999)(571)— — 
Total
$44,165 $46,040 $5,159 $6,235 
______________
(1)    Eliminations primarily relate to the intercompany notes and accounts receivable generated by our cash management program.