Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Activities:
Net income	$ 534	$ 430
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	21	19
Amortization of intangibles	24	24
Provision for losses on accounts receivable	8	5
Stock-based compensation	13	19
Other	16	13
Changes in operating assets and liabilities, net of effect of acquisitions and dispositions:
Accounts receivable	7	12
Prepaid and other current assets	(21)	9
Accounts payable and accrued expenses	(289)	(235)
Unearned revenue	27	(6)
Accrued legal settlements	(29)	(1)
Other current liabilities	19	(58)
Net change in prepaid/accrued income taxes	74	146
Net change in other assets and liabilities	(44)	(24)
Cash provided by operating activities	360	353
Investing Activities:
Capital expenditures	(33)	(23)
Acquisitions, net of cash acquired	(57)	(1)
Proceeds from dispositions	0	2
Changes in short-term investments	3	0
Cash used for investing activities	(87)	(22)
Financing Activities:
Dividends paid to shareholders	(127)	(106)
Distributions to noncontrolling interest holders	(50)	(24)
Repurchase of treasury shares	(1,100)	(201)
Exercise of stock options	10	29
Employee withholding tax on share-based payments	(49)	(44)
Cash used for financing activities	(1,316)	(346)
Effect of exchange rate changes on cash from continuing operations	20	34
Net change in cash and cash equivalents	(1,023)	19
Cash and cash equivalents at beginning of period	2,779	2,392
Cash and cash equivalents at end of period	$ 1,756	$ 2,411