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FAIR VALUE MEASUREMENTS - Schedule of Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Liabilities    
Restricted cash $ 27 $ 43
Short-term cash investments 9 6
Recurring    
Assets    
Derivative assets FTRs 9 7
Equity securities 2 2
Debt securities 283 276
Cash, cash equivalents and restricted cash 1,431 154
Other 48 45
Total assets 1,773 484
Liabilities    
Derivative liabilities FTRs (6) 0
Total liabilities (6) 0
Net assets 1,767 484
Level 1 | Recurring    
Assets    
Derivative assets FTRs 0 0
Equity securities 2 2
Debt securities 0 0
Cash, cash equivalents and restricted cash 1,431 154
Other 0 0
Total assets 1,433 156
Liabilities    
Derivative liabilities FTRs 0 0
Total liabilities 0 0
Net assets 1,433 156
Level 2 | Recurring    
Assets    
Derivative assets FTRs 0 0
Equity securities 0 0
Debt securities 283 276
Cash, cash equivalents and restricted cash 0 0
Other 48 45
Total assets 331 321
Liabilities    
Derivative liabilities FTRs 0 0
Total liabilities 0 0
Net assets 331 321
Level 3 | Recurring    
Assets    
Derivative assets FTRs 9 7
Equity securities 0 0
Debt securities 0 0
Cash, cash equivalents and restricted cash 0 0
Other 0 0
Total assets 9 7
Liabilities    
Derivative liabilities FTRs (6) 0
Total liabilities (6) 0
Net assets $ 3 $ 7