Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 8,855	$ 4,042
Investment securities	9,742	9,557
Receivables, less allowance for doubtful accounts of $87 in 2018 and $96 in 2017	1,276	854
Other current assets	4,059	2,949
Total current assets	23,932	17,402
Property and equipment, net	1,595	1,584
Long-term investment securities	2,361	2,745
Goodwill	3,760	3,281
Other long-term assets	1,805	2,166
Total assets	33,453	27,178
Current liabilities:
Benefits payable	4,961	4,668
Trade accounts payable and accrued expenses	6,266	4,069
Book overdraft	124	141
Unearned revenues	3,706	378
Short-term debt	398	150
Total current liabilities	15,455	9,406
Long-term debt	4,772	4,770
Future policy benefits payable	2,842	2,923
Other long-term liabilities	303	237
Total liabilities	23,372	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; 198,585,156 shares issued at March 31, 2018 and 198,572,458 shares issued at December 31, 2017	33	33
Capital in excess of par value	2,626	2,445
Retained earnings	14,086	13,670
Accumulated other comprehensive (loss) income	(154)	19
Treasury stock, at cost, 60,902,985 shares at March 31, 2018 and 60,893,762 shares at December 31, 2017	(6,510)	(6,325)
Total stockholders’ equity	10,081	9,842
Total liabilities and stockholders’ equity	$ 33,453	$ 27,178