Supplemental Guarantor And Non-Guarantor Condensed Consolidating Financial Statements Statement of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net cash provided by (used in) operating activities from continuing operations	$ 1,941	$ 1,667	$ 2,045
Net cash provided by (used in) operating activities from discontinued operations	0	36	90
Net cash provided by operating activities	1,941	1,703	2,135
Capital expenditures	(828)	(704)	(779)
Proceeds from sale of property / investments	28	10	15
Net proceeds from divestiture of discontinued operations	48	730	0
Proceeds from business divestitures, net of payments of $14 in 2015	197	11	0
Cost of business acquisitions, net of cash acquired	(15)	(1,654)	(345)
Cost of technology investments	(3)	(23)	(5)
Settlement of derivatives	1	0	0
Decrease in restricted cash	0	0	2
Loans to affiliates	0	0	0
Repayments of loans from affiliates	0	0	0
Return of investments in subsidiaries			0
Investments in subsidiaries	0	0
Net cash used in investing activities from continuing operations	(574)	(1,630)	(1,112)
Net cash used in investing activities from discontinued operations	(4)	(69)	(74)
Net cash used in investing activities	(578)	(1,699)	(1,186)
Net (repayments) proceeds under other short-term debt agreements	(34)	(214)	7
Repayments under long-term debt agreements	0	0	(164)
Repayment of senior notes	(862)	(546)	(526)
Proceeds from issuance of senior notes, net of issuance costs	852	2,043	691
Contingent consideration and deferred acquisition purchase price payments	(4)	0	0
Dividend payments of consolidated affiliates to minority shareholders	(42)	(63)	(73)
Proceeds from borrowings from affiliates	0	0	0
Payments on borrowings from affiliates	0	0	0
Capital distributions to affiliates			0
Investment from parent	0	0
Dividends paid to affiliates		0
Repurchase of ordinary shares	(634)	(1,159)	(1,024)
Distribution of cash dividends	(317)	(286)	(301)
Taxes withheld and paid on employees' restricted share awards	(40)	(59)	(8)
Net cash used in financing activities	(1,081)	(284)	(1,398)
Effect of exchange rate fluctuations on cash and cash equivalents	(23)	(45)	(36)
Increase (decrease) in cash and cash equivalents	259	(325)	(485)
Cash and cash equivalents at beginning of the year	579	904	1,389
Cash and cash equivalents at end of the year	838	579	904
Cash and cash equivalents of discontinued operations	0	44	45
Cash and cash equivalents of continuing operations	838	535	859
Reportable Legal Entities | Parent
Net cash provided by (used in) operating activities from continuing operations	(141)	(53)	32
Net cash provided by (used in) operating activities from discontinued operations	0	0	0
Net cash provided by operating activities	(141)	(53)	32
Capital expenditures	0	0	0
Proceeds from sale of property / investments	0	0	0
Net proceeds from divestiture of discontinued operations	0	0
Proceeds from business divestitures, net of payments of $14 in 2015	0	0
Cost of business acquisitions, net of cash acquired	0	(1,606)	0
Cost of technology investments	0	0	0
Settlement of derivatives	0
Decrease in restricted cash			0
Loans to affiliates	0	0	0
Repayments of loans from affiliates	0	0	0
Return of investments in subsidiaries			0
Investments in subsidiaries	(854)	(753)
Net cash used in investing activities from continuing operations	(854)	(2,359)	0
Net cash used in investing activities from discontinued operations	0	0	0
Net cash used in investing activities	(854)	(2,359)	0
Net (repayments) proceeds under other short-term debt agreements	0	0	0
Repayments under long-term debt agreements			0
Repayment of senior notes	0	0	0
Proceeds from issuance of senior notes, net of issuance costs	852	2,043	0
Contingent consideration and deferred acquisition purchase price payments	0
Dividend payments of consolidated affiliates to minority shareholders	0	0	0
Proceeds from borrowings from affiliates	1,095	3,277	1,510
Payments on borrowings from affiliates	(353)	(1,468)	(215)
Capital distributions to affiliates			0
Investment from parent	350	0
Dividends paid to affiliates		0
Repurchase of ordinary shares	(634)	(1,159)	(1,024)
Distribution of cash dividends	(317)	(286)	(301)
Taxes withheld and paid on employees' restricted share awards	0	0	0
Net cash used in financing activities	993	2,407	(30)
Effect of exchange rate fluctuations on cash and cash equivalents	0	0	0
Increase (decrease) in cash and cash equivalents	(2)	(5)	2
Cash and cash equivalents at beginning of the year	4	9	7
Cash and cash equivalents at end of the year	2	4	9
Cash and cash equivalents of discontinued operations	0	0	0
Cash and cash equivalents of continuing operations	2	4	9
Reportable Legal Entities | Subsidiary Guarantors
Net cash provided by (used in) operating activities from continuing operations	125	171	61
Net cash provided by (used in) operating activities from discontinued operations	0	0	0
Net cash provided by operating activities	125	171	61
Capital expenditures	0	0	0
Proceeds from sale of property / investments	0	0	0
Net proceeds from divestiture of discontinued operations	0	0
Proceeds from business divestitures, net of payments of $14 in 2015	0	0
Cost of business acquisitions, net of cash acquired	0	0	0
Cost of technology investments	0	0	0
Settlement of derivatives	0
Decrease in restricted cash			0
Loans to affiliates	(979)	(925)	(60)
Repayments of loans from affiliates	0	0	0
Return of investments in subsidiaries			0
Investments in subsidiaries	0	0
Net cash used in investing activities from continuing operations	(979)	(925)	(60)
Net cash used in investing activities from discontinued operations	0	0	0
Net cash used in investing activities	(979)	(925)	(60)
Net (repayments) proceeds under other short-term debt agreements	0	0	0
Repayments under long-term debt agreements			0
Repayment of senior notes	0	0	0
Proceeds from issuance of senior notes, net of issuance costs	0	0	0
Contingent consideration and deferred acquisition purchase price payments	0
Dividend payments of consolidated affiliates to minority shareholders	0	0	0
Proceeds from borrowings from affiliates	0	0	144
Payments on borrowings from affiliates	0	0	(144)
Capital distributions to affiliates			0
Investment from parent	854	753
Dividends paid to affiliates		0
Repurchase of ordinary shares	0	0	0
Distribution of cash dividends	0	0	0
Taxes withheld and paid on employees' restricted share awards	0	0	0
Net cash used in financing activities	854	753	0
Effect of exchange rate fluctuations on cash and cash equivalents	0	0	0
Increase (decrease) in cash and cash equivalents	0	(1)	1
Cash and cash equivalents at beginning of the year	0	1	0
Cash and cash equivalents at end of the year	0	0	1
Cash and cash equivalents of discontinued operations	0	0	0
Cash and cash equivalents of continuing operations	0	0	1
Reportable Legal Entities | Subsidiary Issuer/Guarantor
Net cash provided by (used in) operating activities from continuing operations	0	0	0
Net cash provided by (used in) operating activities from discontinued operations	0	0	0
Net cash provided by operating activities	0	0	0
Capital expenditures	0	0	0
Proceeds from sale of property / investments	0	0	0
Net proceeds from divestiture of discontinued operations	0	0
Proceeds from business divestitures, net of payments of $14 in 2015	0	(7)
Cost of business acquisitions, net of cash acquired	(15)	(104)	(345)
Cost of technology investments	(3)	0	0
Settlement of derivatives	0
Decrease in restricted cash			0
Loans to affiliates	0	(342)	(1,075)
Repayments of loans from affiliates	0	135	165
Return of investments in subsidiaries			389
Investments in subsidiaries	(350)	0
Net cash used in investing activities from continuing operations	(368)	(318)	(866)
Net cash used in investing activities from discontinued operations	0	0	0
Net cash used in investing activities	(368)	(318)	(866)
Net (repayments) proceeds under other short-term debt agreements	0	0	0
Repayments under long-term debt agreements			(164)
Repayment of senior notes	(862)	(546)	(526)
Proceeds from issuance of senior notes, net of issuance costs	0	0	691
Contingent consideration and deferred acquisition purchase price payments	0
Dividend payments of consolidated affiliates to minority shareholders	0	0	0
Proceeds from borrowings from affiliates	1,230	964	975
Payments on borrowings from affiliates	0	0	(110)
Capital distributions to affiliates			0
Investment from parent	0	0
Dividends paid to affiliates		(100)
Repurchase of ordinary shares	0	0	0
Distribution of cash dividends	0	0	0
Taxes withheld and paid on employees' restricted share awards	0	0	0
Net cash used in financing activities	368	318	866
Effect of exchange rate fluctuations on cash and cash equivalents	0	0	0
Increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents at beginning of the year	0	0	0
Cash and cash equivalents at end of the year	0	0	0
Cash and cash equivalents of discontinued operations	0	0	0
Cash and cash equivalents of continuing operations	0	0	0
Reportable Legal Entities | Non-Guarantor Subsidiaries
Net cash provided by (used in) operating activities from continuing operations	1,957	1,649	1,952
Net cash provided by (used in) operating activities from discontinued operations	0	36	90
Net cash provided by operating activities	1,957	1,685	2,042
Capital expenditures	(828)	(704)	(779)
Proceeds from sale of property / investments	28	10	15
Net proceeds from divestiture of discontinued operations	48	730
Proceeds from business divestitures, net of payments of $14 in 2015	197	18
Cost of business acquisitions, net of cash acquired	0	56	0
Cost of technology investments	0	(23)	(5)
Settlement of derivatives	1
Decrease in restricted cash			2
Loans to affiliates	(1,346)	(3,221)	(1,494)
Repayments of loans from affiliates	353	1,333	304
Return of investments in subsidiaries			0
Investments in subsidiaries	0	0
Net cash used in investing activities from continuing operations	(1,549)	(1,801)	(1,957)
Net cash used in investing activities from discontinued operations	(4)	(69)	(74)
Net cash used in investing activities	(1,553)	(1,870)	(2,031)
Net (repayments) proceeds under other short-term debt agreements	(34)	(214)	7
Repayments under long-term debt agreements			0
Repayment of senior notes	0	0	0
Proceeds from issuance of senior notes, net of issuance costs	0	0	0
Contingent consideration and deferred acquisition purchase price payments	(4)
Dividend payments of consolidated affiliates to minority shareholders	(42)	(63)	(73)
Proceeds from borrowings from affiliates	0	247	0
Payments on borrowings from affiliates	0	0	0
Capital distributions to affiliates			389
Investment from parent	0	0
Dividends paid to affiliates		0
Repurchase of ordinary shares	0	0	0
Distribution of cash dividends	0	0	0
Taxes withheld and paid on employees' restricted share awards	(40)	(59)	(8)
Net cash used in financing activities	(120)	(89)	(463)
Effect of exchange rate fluctuations on cash and cash equivalents	(23)	(45)	(36)
Increase (decrease) in cash and cash equivalents	261	(319)	(488)
Cash and cash equivalents at beginning of the year	575	894	1,382
Cash and cash equivalents at end of the year	836	575	894
Cash and cash equivalents of discontinued operations	0	44	45
Cash and cash equivalents of continuing operations	836	531	849
Eliminations
Net cash provided by (used in) operating activities from continuing operations	0	(100)	0
Net cash provided by (used in) operating activities from discontinued operations	0	0	0
Net cash provided by operating activities	0	(100)	0
Capital expenditures	0	0	0
Proceeds from sale of property / investments	0	0	0
Net proceeds from divestiture of discontinued operations	0	0
Proceeds from business divestitures, net of payments of $14 in 2015	0	0
Cost of business acquisitions, net of cash acquired	0	0	0
Cost of technology investments	0	0	0
Settlement of derivatives	0
Decrease in restricted cash			0
Loans to affiliates	2,325	4,488	2,629
Repayments of loans from affiliates	(353)	(1,468)	(469)
Return of investments in subsidiaries			(389)
Investments in subsidiaries	1,204	753
Net cash used in investing activities from continuing operations	3,176	3,773	1,771
Net cash used in investing activities from discontinued operations	0	0	0
Net cash used in investing activities	3,176	3,773	1,771
Net (repayments) proceeds under other short-term debt agreements	0	0	0
Repayments under long-term debt agreements			0
Repayment of senior notes	0	0	0
Proceeds from issuance of senior notes, net of issuance costs	0	0	0
Contingent consideration and deferred acquisition purchase price payments	0
Dividend payments of consolidated affiliates to minority shareholders	0	0	0
Proceeds from borrowings from affiliates	(2,325)	(4,488)	(2,629)
Payments on borrowings from affiliates	353	1,468	469
Capital distributions to affiliates			(389)
Investment from parent	(1,204)	(753)
Dividends paid to affiliates		100
Repurchase of ordinary shares	0	0	0
Distribution of cash dividends	0	0	0
Taxes withheld and paid on employees' restricted share awards	0	0	0
Net cash used in financing activities	(3,176)	(3,673)	(1,771)
Effect of exchange rate fluctuations on cash and cash equivalents	0	0	0
Increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents at beginning of the year	0	0	0
Cash and cash equivalents at end of the year	0	0	0
Cash and cash equivalents of discontinued operations	0	0	0
Cash and cash equivalents of continuing operations	$ 0	$ 0	$ 0