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Accrued Workers' Compensation Costs (Tables)
12 Months Ended
Dec. 31, 2018
Insurance [Abstract]  
Summary of Activities for Unpaid Claims, Claims Adjustment Expenses and Workers' Compensation Liabilities
The following table summarizes the accrued workers’ compensation cost activity for the years ended December 31, 2018, 2017 and 2016:
 
Year Ended December 31,
(in millions)
2018
2017
2016
Total accrued costs, beginning of year
$
255

$
255

$
190

Incurred
 
 
 
Current year
80

98

113

Prior years
(28
)
(6
)
28

Total incurred
52

92

141

Paid
 
 
 
Current year
(12
)
(14
)
(14
)
Prior years
(57
)
(78
)
(62
)
Total paid
(69
)
(92
)
(76
)
Total accrued costs, end of year
$
238

$
255

$
255

The following table summarizes workers' compensation liabilities on the consolidated balance sheets:
(in millions)
 
December 31, 2018
December 31, 2017
Total accrued costs, end of year

$
238

$
255

Collateral paid to carriers and offset against accrued costs
 
(13
)
(23
)
Total accrued costs, net of carrier collateral offset

$
225

$
232

 
 
 
 
Payable in less than 1 year
(net of collateral paid to carriers of $3 and $6 as of December 31, 2018 and 2017, respectively)
 
67

67

Payable in more than 1 year
(net of collateral paid to carriers of $10 and $17 as of December 31, 2018 and 2017, respectively)
 
158

165

Total accrued costs, net of carrier collateral offset


$
225

$
232