Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating cash flows:
Net income before non-controlling interests	$ 819	$ 691
Adjustments to reconcile net income to cash used for operations:
Depreciation and amortization of fixed assets and capitalized software	142	133
Amortization of intangible assets	35	34
Adjustments to acquisition related contingent consideration liability	10	0
Provision for deferred income taxes	71	25
Gain on investments	(44)	(24)
Loss on disposition of assets	5	12
Stock option expense	12	20
Changes in assets and liabilities:
Net receivables	(283)	(193)
Other current assets	(34)	(29)
Other assets	(498)	(37)
Accounts payable and accrued liabilities	27	(218)
Accrued compensation and employee benefits	(615)	(484)
Accrued income taxes	53	49
Other liabilities	124	68
Effect of exchange rate changes	13	19
Net cash (used for) provided by operations	(163)	66
Financing cash flows:
Purchase of treasury shares	(250)	(100)
Proceeds from issuance of debt	50	248
Repayments of debt	(255)	(254)
Shares withheld for taxes on vested units - treasury shares	(68)	(89)
Issuance of common stock out of treasury shares	206	95
Payments of contingent consideration for acquisitions	(5)	(14)
Distributions of non-controlling interests	(15)	(4)
Dividends paid	(255)	(242)
Net cash used for financing activities	(592)	(360)
Investing cash flows:
Capital expenditures	(192)	(149)
Net sales of long-term investments	82	(8)
Proceeds from sales of fixed assets	2	1
Dispositions	3	2
Acquisitions	(91)	(129)
Other, net	2	(1)
Net cash used for investing activities	(194)	(284)
Effect of exchange rate changes on cash and cash equivalents	(122)	(31)
Decrease in cash and cash equivalents	(1,071)	(609)
Cash and cash equivalents at beginning of period	2,301	2,113
Cash and cash equivalents at end of period	$ 1,230	$ 1,504