Cash, Cash Equivalents and Investments - Unrestricted and Restricted - (Tables)

3 Months Ended

Mar. 31, 2022

Cash and Cash Equivalents [Abstract]

Summary of Cash, Cash Equivalents and Investments

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

	March 31, 2022						December 31, 2021
(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	$	235	$	—	$	235	$	612	$	—	$	612
Investments	—		154		154		—		135		135
Restricted cash, cash equivalents and investments:
Payroll funds collected	1,031		—		1,031		1,012		—		1,012
Collateral for health benefits claims	29		102		131		25		98		123
Collateral for workers' compensation claims	51		—		51		58		—		58
Other security deposits	3		—		3		2		—		2
Total restricted cash, cash equivalents and investments	1,114		102		1,216		1,097		98		1,195
Investments, noncurrent	—		165		165		—		168		168
Restricted cash, cash equivalents and investments, noncurrent
Collateral for workers' compensation claims	33		126		159		29		137		166
Other security deposits	4		—		4		—		—		—
Total	$	1,386	$	547	$	1,933	$	1,738	$	538	$	2,276