Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net cash provided by (used in) operating activities from continuing operations	$ 681	$ 542
Cash flows from investing activities:
Capital expenditures, including capitalization of software costs	(171)	(145)
Payments for acquisitions of businesses, net of cash acquired	(30)
Dividend from unconsolidated affiliate	116
Net proceeds from sale of investments	2	27
Other investing activities	(1)	(3)
Net cash (used in) provided by investing activities from continuing operations	(84)	(121)
Cash flows from financing activities:
Proceeds from long-term debt	1,319	994
Repayments of long-term debt	(1,574)	(946)
Issuance of treasury stock	37	80
Purchases of treasury stock	(455)	(580)
Other financing activities	12	1
Net cash used in financing activities from continuing operations	(661)	(451)
Net change in cash and cash equivalents from continuing operations	(64)	(30)
Net cash flows from (to) discontinued operations	27
Beginning balance	358	337
Ending balance	321	307
Parent Company
Cash flows from operating activities:
Net cash provided by (used in) operating activities from continuing operations	(70)	(158)
Cash flows from investing activities:
Capital expenditures, including capitalization of software costs	(2)	(3)
Payments for acquisitions of businesses, net of cash acquired	(55)
Other investing activities	731	538
Net cash (used in) provided by investing activities from continuing operations	674	535
Cash flows from financing activities:
Proceeds from long-term debt	1,319	994
Repayments of long-term debt	(1,573)	(897)
Issuance of treasury stock	37	80
Purchases of treasury stock	(455)	(580)
Other financing activities	9	(1)
Net cash used in financing activities from continuing operations	(663)	(404)
Net change in cash and cash equivalents from continuing operations	(59)	(27)
Net cash flows from (to) discontinued operations	(8)	(5)
Beginning balance	85	73
Ending balance	18	41
Guarantor Subsidiaries
Cash flows from operating activities:
Net cash provided by (used in) operating activities from continuing operations	568	517
Cash flows from investing activities:
Capital expenditures, including capitalization of software costs	(122)	(106)
Payments for acquisitions of businesses, net of cash acquired	25
Dividend from unconsolidated affiliate	116
Net proceeds from sale of investments		3
Other investing activities	4	(1)
Net cash (used in) provided by investing activities from continuing operations	23	(104)
Cash flows from financing activities:
Repayments of long-term debt	(1)	(4)
Other financing activities	(616)	(431)
Net cash used in financing activities from continuing operations	(617)	(435)
Net change in cash and cash equivalents from continuing operations	(26)	(22)
Net cash flows from (to) discontinued operations	35	5
Beginning balance	66	71
Ending balance	75	54
Non-Guarantor Subsidiaries
Cash flows from operating activities:
Net cash provided by (used in) operating activities from continuing operations	183	183
Cash flows from investing activities:
Capital expenditures, including capitalization of software costs	(47)	(36)
Net proceeds from sale of investments	2	24
Other investing activities	(4)
Net cash (used in) provided by investing activities from continuing operations	(49)	(12)
Cash flows from financing activities:
Repayments of long-term debt		(45)
Other financing activities	(113)	(107)
Net cash used in financing activities from continuing operations	(113)	(152)
Net change in cash and cash equivalents from continuing operations	21	19
Beginning balance	207	193
Ending balance	228	212
Eliminations
Cash flows from investing activities:
Other investing activities	(732)	(540)
Net cash (used in) provided by investing activities from continuing operations	(732)	(540)
Cash flows from financing activities:
Other financing activities	732	540
Net cash used in financing activities from continuing operations	$ 732	$ 540