v3.26.1
SEGMENT INFORMATION - Income Statement Captions by Segment (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Mar. 27, 2026
Disclosure of operating segments [line items]            
Revenues $ 6,497,000,000 $ 6,695,000,000 $ 12,933,000,000 $ 13,444,000,000    
Direct operating costs (4,449,000,000) (4,698,000,000) (8,815,000,000) (9,370,000,000)    
General and administrative expenses (289,000,000) (271,000,000) (585,000,000) (582,000,000)    
Gain (loss) on dispositions, net 0 6,000,000 (1,000,000) 220,000,000    
Gain (loss) on dispositions, net recorded in equity 40,000,000 (18,000,000) 57,000,000 (18,000,000)    
Other income (expense), net (16,000,000) (55,000,000) (21,000,000) (36,000,000)    
Interest income (expense), net (739,000,000) (801,000,000) (1,505,000,000) (1,571,000,000)    
Current income tax (expense) recovery (147,000,000) (119,000,000) (257,000,000) (316,000,000)    
Preferred equity distributions 0 0 0 0    
Equity accounted Adjusted EFO 85,000,000 81,000,000 173,000,000 154,000,000    
Depreciation and amortization expense (775,000,000) (767,000,000) (1,535,000,000) (1,497,000,000)    
Impairment reversal (expense), net 0 (14,000,000) 5,000,000 (14,000,000)    
Gain (loss) on dispositions, net 1,000,000   2,000,000      
Gain (loss) on dispositions, net recorded in equity (40,000,000) 18,000,000 (57,000,000) 18,000,000    
Other income (expense), net (154,000,000) (48,000,000) (125,000,000) (150,000,000)    
Deferred 170,000,000 184,000,000 208,000,000 248,000,000    
Non-cash items attributable to equity accounted investments (91,000,000) (58,000,000) (168,000,000) (139,000,000)    
Net income (loss) 93,000,000 135,000,000 309,000,000 391,000,000    
Exchange ratio, exchangeable shares           1
Direct operating costs (5,224,000,000) (5,465,000,000) (10,350,000,000) (10,867,000,000)    
Other income (expense), net (170,000,000) (103,000,000) (146,000,000) (186,000,000)    
Realized gain on offshore service upgrades       19,000,000    
Net unrealized revaluation gain (loss) 70,000,000 (20,000,000) 115,000,000 (40,000,000)    
Net gain (loss) on debt modification and extinguishment 11,000,000 (4,000,000) 27,000,000 (5,000,000)    
Expenses related to employee incentive payments (25,000,000) 16,000,000 (25,000,000)      
Incentive payment expense       16,000,000    
Other operating expense       4,000,000    
Unrealized gain (loss) on reclassification of property, plant and equipment       48,000,000    
Business separation expenses, stand-up costs and restructuring charges 8,000,000 16,000,000 22,000,000 38,000,000    
Transaction costs 9,000,000 1,000,000 13,000,000 11,000,000    
Other expenses 9,000,000   31,000,000 6,000,000    
Equity accounted income (loss) (6,000,000) 23,000,000 5,000,000 15,000,000 $ 42,000,000  
Gain recognized on deconsolidation due to loss of control of our healthcare services operation   76,000,000   76,000,000    
Expenses related to expected employee incentive payments   38,000,000   40,000,000    
Business services            
Disclosure of operating segments [line items]            
Revenues 2,116,000,000 2,379,000,000 4,162,000,000 4,871,000,000    
Depreciation and amortization expense (198,000,000) (208,000,000) (390,000,000) 430,000,000    
Infrastructure services            
Disclosure of operating segments [line items]            
Revenues 762,000,000 764,000,000 1,517,000,000 1,495,000,000    
Depreciation and amortization expense (180,000,000) (175,000,000) (358,000,000) 340,000,000    
Industrials            
Disclosure of operating segments [line items]            
Revenues 3,619,000,000 3,552,000,000 7,254,000,000 7,078,000,000    
Depreciation and amortization expense (397,000,000) (384,000,000) (787,000,000) 727,000,000    
Corporate and other            
Disclosure of operating segments [line items]            
Depreciation and amortization expense 0 0 0 0    
Operating segments            
Disclosure of operating segments [line items]            
Revenues 2,439,000,000 2,612,000,000 4,801,000,000 5,230,000,000    
Direct operating costs (1,846,000,000) (2,005,000,000) (3,604,000,000) (3,993,000,000)    
General and administrative expenses (107,000,000) (104,000,000) (216,000,000) (215,000,000)    
Gain (loss) on dispositions, net 0 2,000,000 (1,000,000) 116,000,000    
Gain (loss) on dispositions, net recorded in equity 40,000,000 (4,000,000) 57,000,000 (4,000,000)    
Other income (expense), net (5,000,000) (14,000,000) (7,000,000) 4,000,000    
Interest income (expense), net (220,000,000) (246,000,000) (448,000,000) (492,000,000)    
Current income tax (expense) recovery (47,000,000) (39,000,000) (79,000,000) (121,000,000)    
Preferred equity distributions (13,000,000) (13,000,000) (26,000,000) (26,000,000)    
Equity accounted Adjusted EFO 48,000,000 45,000,000 91,000,000 80,000,000    
Adjusted EFO 289,000,000 234,000,000 568,000,000 579,000,000    
Depreciation and amortization expense (219,000,000) (231,000,000) (435,000,000) (451,000,000)    
Impairment reversal (expense), net   (3,000,000) 2,000,000 (3,000,000)    
Gain (loss) on dispositions, net 1,000,000   2,000,000      
Gain (loss) on dispositions, net recorded in equity (40,000,000) 4,000,000 (57,000,000) 4,000,000    
Other income (expense), net 30,000,000 (3,000,000) 51,000,000 (16,000,000)    
Deferred 38,000,000 68,000,000 54,000,000 90,000,000    
Non-cash items attributable to equity accounted investments (62,000,000) (43,000,000) (108,000,000) (97,000,000)    
Net income (loss) 37,000,000 26,000,000 77,000,000 106,000,000    
Net unrealized revaluation gain (loss)       5,000,000    
Operating segments | Business services            
Disclosure of operating segments [line items]            
Revenues 1,252,000,000 1,372,000,000 2,424,000,000 2,773,000,000    
Direct operating costs (1,056,000,000) (1,164,000,000) (2,027,000,000) (2,345,000,000)    
General and administrative expenses (26,000,000) (31,000,000) (52,000,000) (62,000,000)    
Gain (loss) on dispositions, net 1,000,000 2,000,000 1,000,000 2,000,000    
Gain (loss) on dispositions, net recorded in equity 9,000,000 (4,000,000) 18,000,000 (4,000,000)    
Other income (expense), net (2,000,000) 0 (4,000,000) 2,000,000    
Interest income (expense), net (57,000,000) (71,000,000) (116,000,000) (138,000,000)    
Current income tax (expense) recovery (19,000,000) (13,000,000) (33,000,000) (31,000,000)    
Preferred equity distributions 0 0 0 0    
Equity accounted Adjusted EFO 16,000,000 14,000,000 32,000,000 25,000,000    
Adjusted EFO 118,000,000 105,000,000 243,000,000 222,000,000    
Operating segments | Infrastructure services            
Disclosure of operating segments [line items]            
Revenues 234,000,000 238,000,000 466,000,000 472,000,000    
Direct operating costs (148,000,000) (151,000,000) (295,000,000) (293,000,000)    
General and administrative expenses (21,000,000) (18,000,000) (44,000,000) (39,000,000)    
Gain (loss) on dispositions, net (1,000,000) 0 (2,000,000) 114,000,000    
Gain (loss) on dispositions, net recorded in equity 0 0 0 0    
Other income (expense), net 0 1,000,000 0 21,000,000    
Interest income (expense), net (47,000,000) (44,000,000) (95,000,000) (91,000,000)    
Current income tax (expense) recovery (4,000,000) (7,000,000) (8,000,000) (13,000,000)    
Preferred equity distributions 0 0 0 0    
Equity accounted Adjusted EFO 15,000,000 19,000,000 28,000,000 33,000,000    
Adjusted EFO 28,000,000 38,000,000 50,000,000 204,000,000    
Operating segments | Industrials            
Disclosure of operating segments [line items]            
Revenues 953,000,000 1,002,000,000 1,911,000,000 1,985,000,000    
Direct operating costs (640,000,000) (688,000,000) (1,278,000,000) (1,350,000,000)    
General and administrative expenses (26,000,000) (27,000,000) (52,000,000) (59,000,000)    
Gain (loss) on dispositions, net 0 0 0 0    
Gain (loss) on dispositions, net recorded in equity 32,000,000 0 41,000,000 0    
Other income (expense), net (3,000,000) (15,000,000) (3,000,000) (19,000,000)    
Interest income (expense), net (91,000,000) (111,000,000) (188,000,000) (218,000,000)    
Current income tax (expense) recovery (20,000,000) (19,000,000) (34,000,000) (77,000,000)    
Preferred equity distributions 0 0 0 0    
Equity accounted Adjusted EFO 17,000,000 12,000,000 31,000,000 22,000,000    
Adjusted EFO 222,000,000 154,000,000 428,000,000 284,000,000    
Operating segments | Corporate and other            
Disclosure of operating segments [line items]            
Revenues 0 0 0 0    
Direct operating costs (2,000,000) (2,000,000) (4,000,000) (5,000,000)    
General and administrative expenses (34,000,000) (28,000,000) (68,000,000) (55,000,000)    
Gain (loss) on dispositions, net 0 0 0 0    
Gain (loss) on dispositions, net recorded in equity (1,000,000) 0 (2,000,000) 0    
Other income (expense), net 0 0 0 0    
Interest income (expense), net (25,000,000) (20,000,000) (49,000,000) (45,000,000)    
Current income tax (expense) recovery (4,000,000) 0 (4,000,000) 0    
Preferred equity distributions (13,000,000) (13,000,000) (26,000,000) (26,000,000)    
Equity accounted Adjusted EFO 0 0 0 0    
Adjusted EFO (79,000,000) (63,000,000) (153,000,000) (131,000,000)    
Unallocated amounts            
Disclosure of operating segments [line items]            
Revenues 4,058,000,000 4,083,000,000 8,132,000,000 8,214,000,000    
Direct operating costs (2,603,000,000) (2,693,000,000) (5,211,000,000) (5,377,000,000)    
General and administrative expenses (182,000,000) (167,000,000) (369,000,000) (367,000,000)    
Gain (loss) on dispositions, net 0 4,000,000 0 104,000,000    
Gain (loss) on dispositions, net recorded in equity 0 (14,000,000) 0 (14,000,000)    
Other income (expense), net (11,000,000) (41,000,000) (14,000,000) (40,000,000)    
Interest income (expense), net (519,000,000) (555,000,000) (1,057,000,000) (1,079,000,000)    
Current income tax (expense) recovery (100,000,000) (80,000,000) (178,000,000) (195,000,000)    
Preferred equity distributions 13,000,000 13,000,000 26,000,000 26,000,000    
Equity accounted Adjusted EFO 37,000,000 36,000,000 82,000,000 74,000,000    
Depreciation and amortization expense (556,000,000) (536,000,000) (1,100,000,000) (1,046,000,000)    
Impairment reversal (expense), net   (11,000,000) 3,000,000 (11,000,000)    
Gain (loss) on dispositions, net 0   0      
Gain (loss) on dispositions, net recorded in equity 0 14,000,000 0 14,000,000    
Other income (expense), net (184,000,000) (45,000,000) (176,000,000) (134,000,000)    
Deferred 132,000,000 116,000,000 154,000,000 158,000,000    
Non-cash items attributable to equity accounted investments (29,000,000) (15,000,000) (60,000,000) (42,000,000)    
Net income (loss) $ 56,000,000 $ 109,000,000 $ 232,000,000 $ 285,000,000