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REVENUE - Activity in Uncollectable Accounts (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance $ 64 $ 137
Provision for expected credit losses 32 8
Charged to other accounts 17 34
Write-offs (59) (115)
Ending balance 54 64
Deferred refunded to customer $ 2 $ (15)