v3.26.1
EQUITY-ACCOUNTED INVESTMENTS - Schedule of Ownership Interests and Carrying Value of Joint Ventures (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Disclosure of associates [line items]    
Equity-accounted investments $ 3,714 $ 4,087
Total for all joint ventures    
Disclosure of associates [line items]    
Equity-accounted investments 3,714 4,087
Hydroelectric | Total for all joint ventures    
Disclosure of associates [line items]    
Equity-accounted investments $ 431 $ 517
Hydroelectric | Bottom of range | Total for all joint ventures    
Disclosure of associates [line items]    
Ownership Interest 22.00% 22.00%
Hydroelectric | Top of range | Total for all joint ventures    
Disclosure of associates [line items]    
Ownership Interest 50.00% 50.00%
Wind | Total for all joint ventures    
Disclosure of associates [line items]    
Equity-accounted investments $ 840 $ 1,016
Wind | Bottom of range | Total for all joint ventures    
Disclosure of associates [line items]    
Ownership Interest 21.00% 25.00%
Wind | Top of range | Total for all joint ventures    
Disclosure of associates [line items]    
Ownership Interest 50.00% 50.00%
Utility-scale solar | Total for all joint ventures    
Disclosure of associates [line items]    
Equity-accounted investments $ 1,288 $ 1,398
Utility-scale solar | Bottom of range | Total for all joint ventures    
Disclosure of associates [line items]    
Ownership Interest 21.00% 25.00%
Utility-scale solar | Top of range | Total for all joint ventures    
Disclosure of associates [line items]    
Ownership Interest 65.00% 65.00%
Distributed energy & storage | Total for all joint ventures    
Disclosure of associates [line items]    
Equity-accounted investments $ 567 $ 597
Distributed energy & storage | Bottom of range | Total for all joint ventures    
Disclosure of associates [line items]    
Ownership Interest 13.00% 13.00%
Distributed energy & storage | Top of range | Total for all joint ventures    
Disclosure of associates [line items]    
Ownership Interest 82.00% 67.00%
Sustainable solutions | Total for all joint ventures    
Disclosure of associates [line items]    
Equity-accounted investments $ 588 $ 559
Sustainable solutions | Bottom of range | Total for all joint ventures    
Disclosure of associates [line items]    
Ownership Interest 4.00% 4.00%
Sustainable solutions | Top of range | Total for all joint ventures    
Disclosure of associates [line items]    
Ownership Interest 67.00% 67.00%