Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 1,885	$ 2,777
Restricted cash	50	2
Accounts receivable, net of allowance for doubtful accounts: 2018 - $31; 2017 - $33	1,290	1,319
Prepaid and other current assets	243	226
Total current assets	3,468	4,324
Property and equipment, net of accumulated depreciation: 2018 - $574; 2017 - $554	273	275
Goodwill	3,538	2,989
Other intangible assets, net	1,453	1,388
Other non-current assets	485	449
Total assets	9,217	9,425
Current liabilities:
Accounts payable	192	195
Accrued compensation and contributions to retirement plans	263	472
Short-term debt	0	399
Income taxes currently payable	79	77
Unearned revenue	1,689	1,613
Accrued legal and regulatory settlements	149	107
Other current liabilities	352	351
Total current liabilities	2,724	3,214
Long-term debt	3,660	3,170
Pension and other postretirement benefits	229	244
Other non-current liabilities	537	679
Total liabilities	7,150	7,307
Redeemable noncontrolling interest (Note 8)	1,431	1,350
Commitments and contingencies (Note 12)
Equity:
Common stock	412	412
Additional paid-in capital	732	525
Retained income	10,680	10,025
Accumulated other comprehensive loss	(705)	(649)
Less: common stock in treasury	(10,536)	(9,602)
Total equity — controlling interests	583	711
Total equity — noncontrolling interests	53	57
Total equity	636	768
Total liabilities and equity	$ 9,217	$ 9,425