CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 132	$ 137
Accounts receivable, net of allowance for doubtful accounts of $11 and $13 as of June 30, 2018 and December 31, 2017, respectively	1,055	924
Inventories	91	95
Prepaid expenses and other current assets	137	150
Total current assets	1,415	1,306
Property, plant and equipment, net	1,168	1,145
Goodwill	6,414	6,335
Intangible assets, net	1,166	1,119
Investment in equity method investees	456	462
Other assets	128	136
Total assets	10,747	10,503
Liabilities and Stockholders' Equity
Accounts payable and accrued expenses	957	1,021
Current portion of long-term debt	305	36
Total current liabilities	1,262	1,057
Long-term debt	3,408	3,748
Other liabilities	738	663
Commitments and contingencies
Redeemable noncontrolling interest	76	80
Quest Diagnostics stockholders’ equity:
Common stock, par value $0.01 per share; 600 shares authorized as of both June 30, 2018 and December 31, 2017; 217 and 216 shares issued as of June 30, 2018 and December 31, 2017, respectively	2	2
Additional paid-in capital	2,633	2,612
Retained earnings	7,401	7,138
Accumulated other comprehensive loss	(57)	(48)
Treasury stock, at cost; 81 shares as of both June 30, 2018 and December 31, 2017	(4,756)	(4,783)
Total Quest Diagnostics stockholders' equity	5,223	4,921
Noncontrolling interests	40	34
Total stockholders' equity	5,263	4,955
Total liabilities and stockholders' equity	$ 10,747	$ 10,503

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.