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DEBT AND EQUITY SECURITIES - Schedule of Net Gains (Losses) and Interest Income from Marketable Securities Held to Fund Operating Programs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Unrealized gains (losses), net        
Net gains (losses) and interest income from marketable securities held to fund rabbi trusts $ 30 $ 2 $ 16 $ 24
Revenues for reimbursed costs 14 0 7 11
Other income (loss), net (Note 19) 3 1 5 1
Other comprehensive income (loss) (Note 14) 4 (2) 11 (6)
Realized gains, net        
Net gains (losses) and interest income from marketable securities held to fund rabbi trusts 1 2 3 4
Revenues for reimbursed costs $ 1 $ 1 $ 2 $ 2