Segment Disclosures (Tables)

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Schedule of Revenue from External Customers, by Geographical Areas [Table Text Block]

The following geographic area data includes Revenues from external customers based on product shipment origin:

		United States		Canada		Total
		(Millions)
Revenues from external customers:
	2018	$	8,686	$	—	$	8,686
	2017	8,030		1		8,031
	2016	7,425		74		7,499

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:

	Northeast G&P		Atlantic-Gulf		West		Other		Eliminations			Total
	(Millions)
2018
Segment revenues:
Service revenues
External	$	935	$	2,460	$	2,085	$	22	$	—		$	5,502
Internal	41		49		—		12		(102		)	—
Total service revenues	976		2,509		2,085		34		(102		)	5,502
Total service revenues – commodity consideration (external only)	20		59		321		—		—			400
Product sales
External	245		174		2,365		—		—			2,784
Internal	42		261		83		—		(386		)	—
Total product sales	287		435		2,448		—		(386		)	2,784
Total revenues	$	1,283	$	3,003	$	4,854	$	34	$	(488	)	$	8,686
Other financial information:
Additions to long-lived assets	$	477	$	2,297	$	361	$	36	$	—		$	3,171
Proportional Modified EBITDA of equity-method investments	493		183		94		—		—			770
2017
Segment revenues:
Service revenues
External	$	837	$	2,202	$	2,246	$	27	$	—		$	5,312
Internal	35		37		—		11		(83		)	—
Total service revenues	872		2,239		2,246		38		(83		)	5,312
Product sales
External	264		257		1,840		358		—			2,719
Internal	27		227		173		8		(435		)	—
Total product sales	291		484		2,013		366		(435		)	2,719
Total revenues	$	1,163	$	2,723	$	4,259	$	404	$	(518	)	$	8,031
Other financial information:
Additions to long-lived assets	$	460	$	2,001	$	321	$	32	$	—		$	2,814
Proportional Modified EBITDA of equity-method investments	452		264		79		—		—			795
2016
Segment revenues:
Service revenues
External	$	836	$	1,959	$	2,328	$	48	$	—		$	5,171
Internal	34		39		—		11		(84		)	—
Total service revenues	870		1,998		2,328		59		(84		)	5,171
Product sales
External	134		245		1,183		766		—			2,328
Internal	28		205		197		22		(452		)	—
Total product sales	162		450		1,380		788		(452		)	2,328
Total revenues	$	1,032	$	2,448	$	3,708	$	847	$	(536	)	$	7,499
Other financial information:
Additions to long-lived assets	$	223	$	1,608	$	223	$	92	$	(1	)	$	2,145
Proportional Modified EBITDA of equity-method investments	357		287		110		—		—			754

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:

	Years Ended December 31,
	2018			2017			2016
	(Millions)
Modified EBITDA by segment:
Northeast G&P	$	1,086		$	819		$	853
Atlantic-Gulf	2,023			1,238			1,621
West	308			412			1,544
Other	(29		)	997			(696		)
	3,388			3,466			3,322
Accretion expense associated with asset retirement obligations for nonregulated operations	(33		)	(33		)	(31		)
Depreciation and amortization expenses	(1,725		)	(1,736		)	(1,763		)
Equity earnings (losses)	396			434			397
Impairment of equity-method investments	(32		)	—			(430		)
Other investing income (loss) – net	219			282			63
Proportional Modified EBITDA of equity-method investments	(770		)	(795		)	(754		)
Interest expense	(1,112		)	(1,083		)	(1,179		)
(Provision) benefit for income taxes	(138		)	1,974			25
Net income (loss)	$	193		$	2,509		$	(350	)

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 Assets						Equity-Method Investments
	December 31, 2018			December 31, 2017			December 31, 2018		December 31, 2017
	(Millions)
Northeast G&P	$	14,526		$	14,397		$	5,319	$	5,307
Atlantic-Gulf	16,346			14,989			776		823
West	13,948			16,143			1,726		422
Other (1)	849			1,449			—		—
Eliminations (2)	(367		)	(626		)	—		—
Total	$	45,302		$	46,352		$	7,821	$	6,552

______________

(1) Decrease in Other is due primarily to a decreased cash balance.

(2) Eliminations primarily relate to the intercompany notes and accounts receivable generated by our cash management program.