Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 1,946	$ 1,935
Investment securities	7,600	7,598
Receivables, less allowance for doubtful accounts of $111 in 2015 and $97 in 2014:	1,690	1,053
Other current assets	5,214	4,007
Assets held-for-sale	952	943
Total current assets	17,402	15,536
Property and equipment, net	1,258	1,228
Long-term investment securities	1,972	1,949
Goodwill	3,231	3,231
Other long-term assets	1,761	1,583
Total assets	25,624	23,527
Current liabilities:
Benefits payable	4,764	4,475
Trade accounts payable and accrued expenses	3,554	2,095
Book overdraft	288	334
Unearned revenues	378	361
Liabilities held-for-sale	193	206
Total current liabilities	9,177	7,471
Long-term debt	3,824	3,825
Future policy benefits payable	2,298	2,349
Other long-term liabilities	281	236
Total liabilities	15,580	13,881
Commitments and contingencies
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; 198,223,040 shares issued at March 31, 2015 and 197,951,551 shares issued at December 31, 2014	33	33
Capital in excess of par value	2,465	2,330
Retained earnings	10,302	9,916
Accumulated other comprehensive income	227	223
Treasury stock, at cost, 48,441,768 shares at March 31, 2015 and 48,347,541 shares at December 31, 2014	(2,983)	(2,856)
Total stockholders’ equity	10,044	9,646
Total liabilities and stockholders’ equity	$ 25,624	$ 23,527