Cash, Cash Equivalents and Investments - (Tables)

6 Months Ended

Jun. 30, 2019

Cash and Cash Equivalents [Abstract]

Summary of Cash, Cash Equivalents and Investments

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

	June 30, 2019						December 31, 2018
(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	$	219	$	—	$	219	$	228	$	—	$	—	$	228
Investments	—		76		76		—		54		—		54
Restricted cash, cash equivalents and investments
Insurance carriers' security deposits	14		—		14		15		—		—		15
Payroll funds collected	519		—		519		783		—		—		783
Collateral for health benefits claims	75		—		75		75		—		—		75
Collateral for workers' compensation claims	63		1		64		66		1		—		67
Collateral to secure standby letter of credit	—		—		—		—		—		2		2
Total restricted cash, cash equivalents and investments	671		1		672		939		1		2		942
Investments, noncurrent	—		117		117		—		135		—		135
Restricted cash, cash equivalents and investments, noncurrent
Collateral for workers' compensation claims	195		5		200		182		5		—		187
Total	$	1,085	$	199	$	1,284	$	1,349	$	195	$	2	$	1,546