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Cash, Cash Equivalents and Investments (Tables)
 6 Months Ended
Jun. 30, 2018
Cash and Cash Equivalents [Abstract]  
Summary of Cash, Cash Equivalents and Investments
Our total cash, cash equivalents and investments are summarized below:
 
June 30, 2018
December 31, 2017
(in millions)
Cash and cash equivalents
Available-for-sale marketable securities
Certificate
of
deposits
Total
Cash and cash equivalents
Available-for-sale marketable securities
Certificate
of
deposits
Total
Cash and cash equivalents
$
202

$
—

$
—

$
202

$
336

$
—

$
—

$
336

Investments
—

29

—

29

—

—

—

—

Restricted cash, cash equivalents and investments
 
 
 
 
 
 
 
 
Insurance carriers security deposits
15

—

—

15

15

—

—

15

Payroll funds collected
449

—

—

449

1,095

—

—

1,095

Collateral for health benefits claims
75

—

—

75

69

—

—

69

Collateral for workers' compensation claims
87

1

—

88

98

1

—

99

Collateral to secure standby letter of credit
—

—

2

2

—

—

2

2

Total restricted cash, cash equivalents and investments
626

1

2

629

1,277

1

2

1,280

Investments, noncurrent
—

133

—

133

—

—

—

—

Restricted cash, cash equivalents and investments, noncurrent
 
 
 
 
 
 
 
 
Collateral for workers' compensation claims
165

14

—

179

125

37

—

162

Total
$
993

$
177

$
2

$
1,172

$
1,738

$
38

$
2

$
1,778