Consolidated Statement of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Comprehensive income (loss):
Net income (loss)	$ 323	$ 242	$ 68	$ 780
Pension and other postretirement benefits:
Net actuarial gain (loss) arising during the year, net of taxes of ($4) and ($7) in 2020 and $1 and $1 in 2019	11	(5)	20	(5)
Amortization of actuarial (gain) loss and net actuarial loss from settlements included in net periodic benefit cost (credit), net of taxes of ($1) and ($6) in 2020 and $— and ($3) in 2019	5	4	19	9
Other comprehensive income (loss)	16	(1)	39	4
Comprehensive income (loss)	339	241	107	784
Less: Comprehensive income (loss) attributable to noncontrolling interests	14	21	(27)	54
Comprehensive income (loss) attributable to The Williams Companies, Inc.	$ 325	$ 220	$ 134	$ 730