Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and equivalents	$ 1,905	$ 760
Accounts receivable, net of allowance for doubtful accounts: 2013 - $51 ; 2012 - $54	999	954
Deferred income taxes	133	117
Prepaid and other current assets	144	128
Assets held for sale	0	1,940
Total current assets	3,181	3,899
Property and equipment, net of accumulated depreciation: 2013 - $641 ; 2012 - $772	345	368
Goodwill	1,429	1,438
Other intangible assets, net	1,054	1,081
Other non-current assets	261	266
Total assets	6,270	7,052
Current liabilities:
Accounts payable	250	249
Accrued compensation and contributions to retirement plans	250	453
Short-term debt	0	457
Income taxes currently payable	346	158
Unearned revenue	1,279	1,229
Other current liabilities	563	457
Liabilities held for sale	0	664
Total current liabilities	2,688	3,667
Long-term debt	799	799
Pension and other postretirement benefits	511	529
Other non-current liabilities	380	407
Total liabilities	4,378	5,402
Commitments and contingencies (Note 11)
Redeemable noncontrolling interest (Note 7)	810	810
Equity:
Common stock	412	412
Additional paid-in capital	236	492
Retained income	7,168	6,525
Accumulated other comprehensive loss	(454)	(517)
Less: common stock in treasury	(6,332)	(6,145)
Total equity - controlling interests	1,030	767
Total equity - noncontrolling interests	52	73
Total equity	1,082	840
Total liabilities and equity	$ 6,270	$ 7,052