CASH, CASH EQUIVALENTS AND INVESTMENTS - UNRESTRICTED AND RESTRICTED (Tables)

12 Months Ended

Dec. 31, 2023

Cash and Cash Equivalents [Abstract]

Schedule of Cash, Cash Equivalents and Investments

Our total cash, cash equivalents and investments are summarized below:

	December 31, 2023						December 31, 2022
(in millions)	Cash and cash equivalents		Available-for-sale marketable securities		Total		Cash and cash equivalents		Available-for-sale marketable securities		Total
Cash and cash equivalents	$	287	$	—	$	287	$	354	$	—	$	354
Investments	—		65		65		—		76		76
Restricted cash, cash equivalents and investments
Payroll funds collected	1,067		—		1,067		1,062		—		1,062
Collateral for health benefits claims	31		113		144		29		110		139
Collateral for workers' compensation claims	54		2		56		58		—		58
Other security deposits	2		—		2		4		—		4
Total restricted cash, cash equivalents and investments	1,154		115		1,269		1,153		110		1,263
Investments, noncurrent	—		143		143		—		151		151
Restricted cash, cash equivalents and investments, noncurrent
Collateral for workers' compensation claims	25		133		158		27		123		150
Other security deposits	—		—		—		3		—		3
Total	$	1,466	$	456	$	1,922	$	1,537	$	460	$	1,997