Consolidated Statement of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Comprehensive income (loss):
Net income (loss)	$ 242	$ 200	$ 780	$ 739
Net unrealized gain (loss) from derivative instruments, net of taxes of $3 and $6 in 2018	0	(5)	0	(19)
Reclassifications into earnings of net derivative instruments (gain) loss, net of taxes of ($2) and ($3) in 2018	0	7	0	10
Pension and other postretirement benefits:
Net actuarial gain (loss) arising during the year, net of taxes of $1 and $1 in 2019, and ($0) and ($1) in 2018	(5)	0	(5)	4
Amortization of actuarial (gain) loss and net actuarial loss from settlements included in net periodic benefit cost (credit), net of taxes of ($0) and ($3) in 2019, and ($3) and ($5) in 2018	4	4	9	14
Other comprehensive income (loss)	(1)	6	4	9
Comprehensive income (loss)	241	206	784	748
Less: Comprehensive income (loss) attributable to noncontrolling interests	21	72	54	321
Comprehensive income (loss) attributable to The Williams Companies, Inc.	$ 220	$ 134	$ 730	$ 427