Schedule I - Condensed Financial Information of Registrant (Tables)

12 Months Ended

Dec. 31, 2017

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

Statement of Comprehensive Income (Loss) (Parent) [Table Text Block]

The Williams Companies, Inc.

Schedule I — Condensed Financial Information of Registrant

Statement of Comprehensive Income (Loss) (Parent)

	Years Ended December 31,
	2017			2016			2015
	(Millions, except per-share amounts)
Equity in earnings of consolidated subsidiaries	$	898		$	522		$	232
Interest incurred — external	(261		)	(268		)	(255		)
Interest incurred — affiliate	(413		)	(568		)	(828		)
Interest income — affiliate	—			—			6
Other income (expense) — net	(23		)	(53		)	(75		)
Income (loss) before income taxes	201			(367		)	(920		)
Provision (benefit) for income taxes	(1,973		)	57			(349		)
Net income (loss)	$	2,174		$	(424	)	$	(571	)
Basic earnings (loss) per common share:
Net income (loss)	$	2.63		$	(.57	)	$	(.76	)
Weighted-average shares (thousands)	826,177			750,673			749,271
Diluted earnings (loss) per common share:
Net income (loss)	$	2.62		$	(.57	)	$	(.76	)
Weighted-average shares (thousands)	828,518			750,673			749,271
Other comprehensive income (loss):
Equity in other comprehensive income (loss) of consolidated subsidiaries	$	(2	)	$	171		$	(204	)
Other comprehensive income (loss) attributable to The Williams Companies, Inc.	102			1			33
Other comprehensive income (loss)	100			172			(171		)
Less: Other comprehensive income (loss) attributable to noncontrolling interests	(1		)	69			(70		)
Comprehensive income (loss) attributable to The Williams Companies, Inc.	$	2,275		$	(321	)	$	(672	)

See accompanying notes.

Balance Sheet (Parent) [Table Text Block]

The Williams Companies, Inc.

Schedule I — Condensed Financial Information of Registrant – (Continued)

Balance Sheet (Parent)

	December 31,
	2017		2016
	(Millions)
ASSETS
Current assets:
Cash and cash equivalents	$	14	$	14
Other current assets and deferred charges	10		16
Total current assets	24		30
Investments in and advances to consolidated subsidiaries	25,268		22,359
Property, plant, and equipment — net	77		77
Other noncurrent assets	6		8
Total assets	$	25,375	$	22,474
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	20	$	27
Other current liabilities	187		169
Total current liabilities	207		196
Long-term debt	4,438		4,939
Notes payable — affiliates	7,763		8,171
Pension, other postretirement, and other noncurrent liabilities	164		287
Deferred income tax liabilities	3,147		4,238
Contingent liabilities and commitments
Equity:
Common stock	861		785
Other stockholders’ equity	8,795		3,858
Total stockholders’ equity	9,656		4,643
Total liabilities and stockholders’ equity	$	25,375	$	22,474

See accompanying notes.

Statement of Cash Flows (Parent) [Table Text Block]

The Williams Companies, Inc.

Schedule I — Condensed Financial Information of Registrant – (Continued)

Statement of Cash Flows (Parent)

	Years Ended December 31,
	2017			2016			2015
	(Millions)
NET CASH FLOWS PROVIDED (USED) BY OPERATING ACTIVITIES	$	(648	)	$	(827	)	$	(1,181	)
FINANCING ACTIVITIES:
Proceeds from long-term debt	1,635			2,280			2,097
Payments of long-term debt	(2,140		)	(2,155		)	(1,817		)
Changes in notes payable to affiliates	(408		)	9			2,211
Proceeds from issuance of common stock	2,131			9			27
Dividends paid	(992		)	(1,261		)	(1,836		)
Other — net	(9		)	(6		)	(30		)
Net cash provided (used) by financing activities	217			(1,124		)	652
INVESTING ACTIVITIES:
Capital expenditures	(22		)	(13		)	(29		)
Changes in investments in and advances to consolidated subsidiaries	453			1,966			521
Net cash provided (used) by investing activities	431			1,953			492
Increase (decrease) in cash and cash equivalents	—			2			(37		)
Cash and cash equivalents at beginning of year	14			12			49
Cash and cash equivalents at end of year	$	14		$	14		$	12

See accompanying notes.