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Consolidated Statement of Comprehensive Income (Loss) (Unaudited) - Williams - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Comprehensive income (loss):        
Net income (loss) $ 683 $ 741 $ 1,995 $ 1,829
Designated interest rate cash flow hedging activities:        
Net unrealized gain (loss) from derivative instruments, net of taxes of $— and $(1) in 2025 and $4 and $(1) in 2024 0 (13) 3 2
Reclassifications into earnings of net derivative instruments (gain) loss, net of taxes of $1 and $1 in 2025 and $— and $— in 2024 (1) 0 (2) (1)
Pension and other postretirement benefits:        
Amortization of actuarial (gain) loss and net actuarial loss from settlements included in net periodic benefit cost (credit), net of taxes of $2 and $2 in 2025 and $— and $— in 2024 (3) 0 (4) (1)
Other comprehensive income (loss) (4) (13) (3) 0
Comprehensive income (loss) 679 728 1,992 1,829
Less: Comprehensive income (loss) attributable to noncontrolling interests 36 35 111 90
Comprehensive income (loss) attributable to The Williams Companies, Inc. $ 643 $ 693 $ 1,881 $ 1,739