Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 2,779	$ 2,392
Short-term investments	12	8
Accounts receivable, net of allowance for doubtful accounts: 2017 - $33; 2016 - $28	1,319	1,122
Prepaid and other current assets	214	149
Total current assets	4,324	3,671
Property and equipment:
Buildings and leasehold improvements	354	356
Equipment and furniture	475	452
Total property and equipment	829	808
Less: accumulated depreciation	(554)	(537)
Property and equipment, net	275	271
Goodwill	2,989	2,949
Other intangible assets, net	1,388	1,506
Other non-current assets	449	272
Total assets	9,425	8,669
Current liabilities:
Accounts payable	195	183
Accrued compensation and contributions to retirement plans	472	409
Short-term debt	399	0
Income taxes currently payable	77	95
Unearned revenue	1,613	1,509
Accrued legal and regulatory settlements	107	56
Other current liabilities	351	359
Total current liabilities	3,214	2,611
Long-term debt	3,170	3,564
Pension and other postretirement benefits	244	274
Other non-current liabilities	679	439
Total liabilities	7,307	6,888
Redeemable noncontrolling interest	1,350	1,080
Commitments and contingencies (Note 13)
Equity:
Common stock, $1 par value: authorized - 600 million shares; issued - 412 million shares in 2017 and 2016	412	412
Additional paid-in capital	525	502
Retained income	10,025	9,210
Accumulated other comprehensive loss	(649)	(773)
Less: common stock in treasury - at cost: 2017 - 158 million shares; 2016 - 153 million shares	(9,602)	(8,701)
Total equity – controlling interests	711	650
Total equity – noncontrolling interests	57	51
Total equity	768	701
Total liabilities and equity	$ 9,425	$ 8,669