Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 272	$ 249
Adjustments to reconcile net income to cash provided by (used for) operating activities:
Depreciation of fixed assets	59	55
Amortization of intangible assets	99	104
Share-based compensation expense	69	55
Deferred income taxes	13	16
Change in assets and liabilities:
Fiduciary receivables	(42)	(644)
Short term investments - funds held on behalf of clients	(322)	(62)
Fiduciary liabilities	364	706
Receivables, net	174	61
Accounts payable and accrued liabilities	(417)	(451)
Restructuring reserves	(16)	(16)
Current income taxes	(65)	41
Pension, other post-retirement and other post-employment liabilities	(196)	(110)
Other assets and liabilities	62	(19)
CASH PROVIDED BY (USED FOR) OPERATIONS	54	(15)
CASH FLOWS FROM INVESTING ACTIVITIES
Sales of long-term investments	18	36
Purchases of long-term investments	(3)	(3)
Net (purchases) sales of short-term investments - non-fiduciary	(16)	283
Acquisition of businesses, net of cash acquired	(2)	(23)
Proceeds from sale of businesses	1	0
Capital expenditures	(60)	(71)
CASH (USED FOR) PROVIDED BY INVESTING ACTIVITIES	(62)	222
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	(300)	(100)
Issuance of shares for employee benefit plans	36	49
Issuance of debt	1,150	75
Repayment of debt	(715)	(140)
Cash dividends to shareholders	(50)	(49)
Purchase of shares from noncontrolling interests	(1)	0
Dividends paid to noncontrolling interests	0	(1)
CASH PROVIDED BY (USED FOR) FINANCING ACTIVITIES	120	(166)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	5	10
NET INCREASE IN CASH AND CASH EQUIVALENTS	117	51
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	291	272
CASH AND CASH EQUIVALENTS AT END OF PERIOD	408	323
Supplemental disclosures:
Interest paid	32	75
Income taxes paid, net of refunds	$ 148	$ 40