Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 4,673	$ 4,054
Investment securities	12,554	10,972
Receivables, less allowance for doubtful accounts of $72 in 2020 and $69 in 2019	1,138	1,056
Other current assets	5,276	3,806
Total current assets	23,641	19,888
Property and equipment, net	2,371	1,955
Long-term investment securities	1,212	406
Goodwill	4,447	3,928
Equity method investments	1,170	1,063
Other long-term assets	2,128	1,834
Total assets	34,969	29,074
Current liabilities:
Benefits payable	8,143	6,004
Trade accounts payable and accrued expenses	4,013	3,754
Book overdraft	320	225
Unearned revenues	318	247
Short-term debt	600	699
Total current liabilities	13,394	10,929
Long-term debt	6,060	4,967
Other long-term liabilities	1,787	1,141
Total liabilities	21,241	17,037
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; 198,648,742 shares issued at December 31, 2020 and 198,629,992 shares issued at December 31, 2019	33	33
Capital in excess of par value	2,705	2,820
Retained earnings	20,517	17,483
Accumulated other comprehensive income (loss)	391	156
Treasury stock, at cost, 69,787,614 shares at December 31, 2020 and 66,524,771 shares at December 31, 2019	(9,918)	(8,455)
Total stockholders’ equity	13,728	12,037
Total liabilities and stockholders’ equity	$ 34,969	$ 29,074