Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 8,052	$ 4,042
Investment securities	9,464	9,557
Receivables, less allowance for doubtful accounts of $80 in 2018 and $96 in 2017	1,471	854
Other current assets	4,410	2,949
Assets held-for-sale	3,467	0
Total current assets	26,864	17,402
Property and equipment, net	1,626	1,584
Long-term investment securities	379	2,745
Goodwill	3,895	3,281
Other long-term assets	1,506	2,166
Total assets	34,270	27,178
Current liabilities:
Benefits payable	5,020	4,668
Trade accounts payable and accrued expenses	6,952	4,069
Book overdraft	74	141
Unearned revenues	3,630	378
Short-term debt	398	150
Liabilities held-for-sale	2,694	0
Total current liabilities	18,768	9,406
Long-term debt	4,773	4,770
Future policy benefits payable	197	2,923
Other long-term liabilities	321	237
Total liabilities	24,059	17,336
Commitments and contingencies (Note 14)
Stockholders’ equity:
Preferred stock, $1 par; 10,000,000 shares authorized; none issued	0	0
Common stock, $0.16 2/3 par; 300,000,000 shares authorized; 198,591,361 shares issued at June 30, 2018 and 198,572,458 shares issued at December 31, 2017	33	33
Capital in excess of par value	2,672	2,445
Retained earnings	14,211	13,670
Accumulated other comprehensive (loss) income	(176)	19
Treasury stock, at cost, 60,827,954 shares at June 30, 2018 and 60,893,762 shares at December 31, 2017	(6,529)	(6,325)
Total stockholders’ equity	10,211	9,842
Total liabilities and stockholders’ equity	$ 34,270	$ 27,178