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DESCRIPTION OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES - Assets and Liabilities of the Trust (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Current assets:    
Cash and cash equivalents $ 177 $ 287
Restricted cash, cash equivalents and investments 893 1,269
Total current assets 2,566 2,578
Total assets 3,703 3,693
Current liabilities:    
Accounts payable and other current liabilities 85 87
Accrued wages 558 515
Payroll tax liabilities and other payroll withholdings 1,421 1,438
Total current liabilities 2,463 2,463
Total liabilities 3,603 $ 3,615
Variable Interest Entity    
Current assets:    
Cash and cash equivalents 1  
Restricted cash, cash equivalents and investments 91  
Total current assets 92  
Total assets 92  
Current liabilities:    
Accounts payable and other current liabilities 1  
Accrued wages 14  
Payroll tax liabilities and other payroll withholdings 78  
Total current liabilities 92  
Total liabilities $ 92