Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Operating cash flows:
Net income before non-controlling interests	$ 691	$ 620
Adjustments to reconcile net income to cash used for operations:
Depreciation and amortization of fixed assets and capitalized software	133	133
Amortization of intangible assets	34	32
Provision for deferred income taxes	25	73
Gain on investments	(24)	(13)
Loss (gain) on disposition of assets	12	1
Stock option expense	20	12
Changes in assets and liabilities:
Net receivables	(193)	(70)
Other current assets	(29)	(75)
Other assets	(37)	(145)
Accounts payable and accrued liabilities	(218)	148
Accrued compensation and employee benefits	(484)	(422)
Accrued income taxes	49	43
Other liabilities	68	64
Effect of exchange rate changes	19	(71)
Net cash used for operations	66	330
Financing cash flows:
Purchase of treasury shares	(100)	(235)
Proceeds from issuance of debt	248
Repayments of debt	(254)	(6)
Purchase of non-controlling interests		(21)
Shares withheld for taxes on vested units - treasury shares	(89)	(86)
Issuance of common stock	95	112
Payments of contingent consideration for acquisitions	(14)
Distributions of non-controlling interests	(4)
Dividends paid	(242)	(235)
Net cash used for financing activities	(360)	(471)
Investing cash flows:
Capital expenditures	(149)	(142)
Net (purchases) sales of long-term investments	(8)	33
Proceeds from sales of fixed assets	1	1
Dispositions	2	1
Acquisitions	(129)	(113)
Other, net	(1)	(1)
Net cash used for investing activities	(284)	(221)
Effect of exchange rate changes on cash and cash equivalents	(31)	127
Decrease in cash and cash equivalents	(609)	(235)
Cash and cash equivalents at beginning of period	2,113	1,894
Cash and cash equivalents at end of period	$ 1,504	$ 1,659