Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating Activities:
Net income	$ 1,339	$ 1,659
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	61	63
Amortization of intangibles	73	71
Provision for losses on accounts receivable	17	10
Stock-based compensation	65	54
Gain on disposition	0	(722)
Other	42	48
Changes in operating assets and liabilities, net of effect of acquisitions and dispositions:
Accounts receivable	(64)	(26)
Prepaid and other current assets	3	5
Accounts payable and accrued expenses	(50)	(81)
Unearned revenue	(107)	(6)
Accrued legal settlements	(4)	(134)
Other current liabilities	(94)	(10)
Net change in prepaid/accrued income taxes	(42)	383
Net change in other assets and liabilities	(36)	(57)
Cash provided by operating activities	1,203	1,257
Investing Activities:
Capital expenditures	(77)	(67)
Acquisitions, net of cash acquired	(80)	(145)
Proceeds from dispositions	2	1,071
Changes in short-term investments	0	(1)
Cash (used for) provided by investing activities	(155)	858
Financing Activities:
Payments on short-term debt, net	0	(143)
Proceeds from issuance of senior notes, net	0	493
Dividends paid to shareholders	(316)	(286)
Distributions to noncontrolling interest holders	(69)	(59)
Contingent consideration payments	0	(15)
Repurchase of treasury shares	(846)	(1,123)
Exercise of stock options	69	84
Employee withholding tax on share-based payments	(49)	(55)
Cash used for financing activities	(1,211)	(1,104)
Effect of exchange rate changes on cash from continuing operations	83	(93)
Net change in cash and cash equivalents	(80)	918
Cash and cash equivalents at beginning of period	2,392	1,481
Cash and cash equivalents at end of period	$ 2,312	$ 2,399