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

9 Months Ended

Sep. 30, 2021

Cash and Cash Equivalents [Abstract]

Summary of Cash, Cash Equivalents and Investments

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

	September 30, 2021						December 31, 2020
(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	$	525	$	—	$	525	$	301	$	—	$	301
Investments	—		155		155		—		57		57
Restricted cash, cash equivalents and investments:
Payroll funds collected	863		—		863		1,228		—		1,228
Collateral for health benefits claims	24		94		118		16		82		98
Collateral for workers' compensation claims	57		—		57		60		—		60
Other security deposits	2		—		2		2		—		2
Total restricted cash, cash equivalents and investments	946		94		1,040		1,306		82		1,388
Investments, noncurrent	—		167		167		—		138		138
Restricted cash, cash equivalents and investments, noncurrent
Collateral for workers' compensation claims	31		145		176		36		174		210
Total	$	1,502	$	561	$	2,063	$	1,643	$	451	$	2,094