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LONG-TERM DEBT - Amounts Outstanding and Principal Repayments (Details)
$ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Debt Instrument [Line Items]        
Outstanding $ 41,706 $ 38,756    
Current portion of long-term debt (1,898) (1,320)    
Unamortized debt discount and issue costs (239) (243)    
Fair value adjustments 76 148    
Noncurrent portion of long-term debt 39,645 37,341    
Fair value adjustments of interest rate hedge 64 0    
Repayments of Long-term Debt [Abstract]        
2023 1,898      
2024 2,782      
2025 2,827      
2026 2,278      
2027 3,113      
COLUMBIA PIPELINE GROUP, INC.3        
Debt Instrument [Line Items]        
Fair value adjustments of interest rate hedge 140 148    
TRANSCANADA PIPELINES LIMITED        
Debt Instrument [Line Items]        
Outstanding 34,998 33,427    
NOVA GAS TRANSMISSION LTD.        
Debt Instrument [Line Items]        
Outstanding 919 899    
Medium Term Notes | TRANSCANADA PIPELINES LIMITED        
Debt Instrument [Line Items]        
Outstanding $ 13,966 $ 12,491    
Interest Rate 4.50% 4.20% 4.50% 4.20%
Senior Unsecured Notes | TRANSCANADA PIPELINES LIMITED        
Debt Instrument [Line Items]        
Outstanding $ 21,032 $ 20,936 $ 15,542 $ 16,542
Interest Rate 4.90% 4.80% 4.90% 4.80%
Senior Unsecured Notes | COLUMBIA PIPELINE GROUP, INC.3        
Debt Instrument [Line Items]        
Outstanding $ 2,030 $ 1,898 $ 1,500 $ 1,500
Interest Rate 4.90% 4.90% 4.90% 4.90%
Senior Unsecured Notes | ANR PIPELINE COMPANY        
Debt Instrument [Line Items]        
Outstanding $ 1,587 $ 472 $ 1,172 $ 372
Interest Rate 4.10% 5.30% 4.10% 5.30%
Senior Unsecured Notes | TC PIPELINES, LP        
Debt Instrument [Line Items]        
Outstanding $ 1,150 $ 1,076 $ 850  
Interest Rate 4.20% 4.20% 4.20% 4.20%
Senior Unsecured Notes | GAS TRANSMISSION NORTHWEST LLC        
Debt Instrument [Line Items]        
Outstanding $ 440 $ 411 $ 325 $ 325
Interest Rate 4.30% 4.30% 4.30% 4.30%
Senior Unsecured Notes | PORTLAND NATURAL GAS TRANSMISSION SYSTEM        
Debt Instrument [Line Items]        
Outstanding $ 338 $ 316 $ 250 $ 250
Interest Rate 2.80% 2.80% 2.80% 2.80%
Senior Unsecured Notes | GREAT LAKES GAS TRANSMISSION LIMITED PARTNERSHIP        
Debt Instrument [Line Items]        
Outstanding $ 198 $ 211 $ 146 $ 167
Interest Rate 7.60% 7.60% 7.60% 7.60%
Debentures and Notes, Maturity Date of 2024 | NOVA GAS TRANSMISSION LTD.        
Debt Instrument [Line Items]        
Outstanding $ 100 $ 100    
Interest Rate 9.90% 9.90% 9.90% 9.90%
Debentures and Notes, Maturity Date of 2023 | NOVA GAS TRANSMISSION LTD.        
Debt Instrument [Line Items]        
Outstanding $ 271 $ 254 $ 200 $ 200
Interest Rate 7.90% 7.90% 7.90% 7.90%
Medium-Term Notes, Maturity between 2025 and 2030 | NOVA GAS TRANSMISSION LTD.        
Debt Instrument [Line Items]        
Outstanding $ 504 $ 504    
Interest Rate 7.40% 7.40% 7.40% 7.40%
Medium-Term Notes, Maturity Date of 2026 | NOVA GAS TRANSMISSION LTD.        
Debt Instrument [Line Items]        
Outstanding $ 44 $ 41 $ 33 $ 33
Interest Rate 7.50% 7.50% 7.50% 7.50%
Unsecured Term Loan | TUSCARORA GAS TRANSMISSION COMPANY        
Debt Instrument [Line Items]        
Outstanding $ 46 $ 46 $ 34 $ 36
Interest Rate 6.50% 1.30% 6.50% 1.30%