Schedule II - Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2017

Valuation and Qualifying Accounts [Abstract]

Schedule II - Valuation and Qualifying Accounts [Text Block]

The Williams Companies, Inc.

Schedule II — Valuation and Qualifying Accounts

			Additions
	Beginning Balance		Charged (Credited) To Costs and Expenses			Other		Deductions		Ending Balance
	(Millions)
2017
Deferred tax asset valuation allowance (1)	$	334	$	(110	)	$	—	$	—	$	224
2016
Deferred tax asset valuation allowance (1)	190		144			—		—		334
2015
Deferred tax asset valuation allowance (1)	206		(16		)	—		—		190

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(1)    Deducted from related assets.