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

12 Months Ended

Dec. 31, 2020

Cash and Cash Equivalents [Abstract]

Cash, Cash Equivalents and Investments

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

	December 31, 2020						December 31, 2019
(in millions)	Cash and cash equivalents		Available-for-sale marketable securities		Total		Cash and cash equivalents		Available-for-sale marketable securities		Certificate of deposits		Total
Cash and cash equivalents	$	301	$	—	$	301	$	213	$	—	$	—	$	213
Investments	—		57		57		—		68		—		68
Restricted cash, cash equivalents and investments
Payroll funds collected	1,228		—		1,228		1,018		—		—		1,018
Collateral for health benefits claims	16		82		98		98		—		—		98
Collateral for workers' compensation claims	60		—		60		62		—		—		62
Other security deposits	2		—		2		2		—		—		2
Total restricted cash, cash equivalents and investments	1,306		82		1,388		1,180		—		—		1,180
Investments, noncurrent	—		138		138		—		125		—		125
Restricted cash, cash equivalents and investments, noncurrent
Collateral for workers' compensation claims	36		174		210		63		148		1		212
Total	$	1,643	$	451	$	2,094	$	1,456	$	341	$	1	$	1,798