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FAIR VALUE MEASUREMENTS - Schedule of Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Liabilities    
Restricted cash $ 45 $ 43
Short-term cash investments 9 6
Recurring    
Assets    
Derivative assets FTRs 8 7
Equity securities 2 2
Debt securities 276 276
Cash, cash equivalents and restricted cash 614 154
Other 52 45
Total assets 952 484
Liabilities    
Derivative liabilities FTRs (7) 0
Total liabilities (7) 0
Net assets 945 484
Level 1 | Recurring    
Assets    
Derivative assets FTRs 0 0
Equity securities 2 2
Debt securities 0 0
Cash, cash equivalents and restricted cash 614 154
Other 0 0
Total assets 616 156
Liabilities    
Derivative liabilities FTRs 0 0
Total liabilities 0 0
Net assets 616 156
Level 2 | Recurring    
Assets    
Derivative assets FTRs 0 0
Equity securities 0 0
Debt securities 276 276
Cash, cash equivalents and restricted cash 0 0
Other 52 45
Total assets 328 321
Liabilities    
Derivative liabilities FTRs 0 0
Total liabilities 0 0
Net assets 328 321
Level 3 | Recurring    
Assets    
Derivative assets FTRs 8 7
Equity securities 0 0
Debt securities 0 0
Cash, cash equivalents and restricted cash 0 0
Other 0 0
Total assets 8 7
Liabilities    
Derivative liabilities FTRs (7) 0
Total liabilities (7) 0
Net assets $ 1 $ 7