Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating cash flows:
Net income before non-controlling interests	$ 424	$ 354
Adjustments to reconcile net income to cash used for operations:
Depreciation and amortization of fixed assets and capitalized software	69	66
Amortization of intangible assets	18	17
Adjustments to acquisition related contingent consideration liability	1	0
Provision for deferred income taxes	51	35
Gain on investments	(21)	(20)
Loss on disposition of assets	2	12
Stock option expense	7	11
Changes in assets and liabilities:
Net receivables	(120)	(101)
Other current assets	(54)	151
Other assets	(334)	(213)
Accounts payable and accrued liabilities	53	(136)
Accrued compensation and employee benefits	(727)	(702)
Accrued income taxes	39	17
Other liabilities	(37)	26
Effect of exchange rate changes	36	(20)
Net cash used for operations	(593)	(503)
Financing cash flows:
Purchase of treasury shares	(100)
Proceeds from issuance of debt	50	248
Repayments of debt	(252)	(252)
Shares withheld for taxes on vested units - treasury shares	(65)	(84)
Issuance of common stock	135	77
Payments of contingent consideration for acquisitions	(3)	(13)
Distributions of non-controlling interests	(2)
Dividends paid	(127)	(121)
Net cash used for financing activities	(364)	(145)
Investing cash flows:
Capital expenditures	(88)	(51)
Net sales of long-term investments	92	(5)
Proceeds from sales of fixed assets	1	1
Dispositions	3	0
Acquisitions	(1)	(60)
Other, net	1	(1)
Net cash provided by (used for) investing activities	8	(116)
Effect of exchange rate changes on cash and cash equivalents	(89)	61
Decrease in cash and cash equivalents	(1,038)	(703)
Cash and cash equivalents at beginning of period	2,301	2,113
Cash and cash equivalents at end of period	$ 1,263	$ 1,410