Consolidated Statement of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Comprehensive income (loss):
Net income (loss)	$ 193	$ (505)	$ 762	$ (518)
Cash flow hedging activities:
Net unrealized gain (loss) from derivative instruments, net of taxes of $0 and ($1) in 2017	1	0	4	0
Reclassifications into earnings of net derivative instruments (gain) loss	(2)	0	(2)	0
Foreign currency translation activities:
Foreign currency translation adjustments, net of taxes of $3 and ($12) in 2016	0	10	0	99
Pension and other postretirement benefits:
Amortization of prior service cost (credit) included in net periodic benefit cost, net of taxes of $1 and $1 in 2017 and 2016	(1)	(1)	(2)	(2)
Net actuarial gain (loss) arising during the year, net of taxes of $2 in 2016	0	(3)	0	(3)
Amortization of actuarial (gain) loss included in net periodic benefit cost, net of taxes of ($2) and ($5) in 2017 and ($3) and ($6) in 2016	5	5	9	10
Other comprehensive income (loss)	3	11	9	104
Comprehensive income (loss)	196	(494)	771	(414)
Less: Comprehensive income (loss) attributable to noncontrolling interests	112	(98)	309	(17)
Comprehensive income (loss) attributable to The Williams Companies, Inc.	$ 84	$ (396)	$ 462	$ (397)