Willis Towers Watson Public Limited (WTW) 10-Q 9 May 14 2014 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2014	2-May-14
Document Documentand Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	31-Mar-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q1	'
Trading Symbol	'WSH	'
Entity Registrant Name	'WILLIS GROUP HOLDINGS PLC	'
Entity Central Index Key	'0001140536	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	178,845,855

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
REVENUES	'	'
Commissions and fees	$1,090	$1,046
Investment income	4	4
Other income	3	1
Total revenues	1,097	1,051
EXPENSES	'	'
Salaries and benefits	-570	-568
Other operating expenses	-165	-162
Depreciation expense	-23	-26
Amortization of intangible assets	-13	-14
Total expenses	-771	-770
OPERATING INCOME	326	281
Other income (expense), net	0	6
Interest expense	-32	-31
INCOME BEFORE INCOME TAXES AND INTEREST IN EARNINGS OF ASSOCIATES	294	256
Income taxes	-63	-48
INCOME BEFORE INTEREST IN EARNINGS OF ASSOCIATES	231	208
Interest in earnings of associates, net of tax	19	15
INCOME FROM CONTINUING OPERATIONS	250	'
NET INCOME	250	223
Less: net income attributable to noncontrolling interests	-4	-4
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$246	$219
EARNINGS PER SHARE — BASIC AND DILUTED	'	'
— Basic earnings per share - continuing operations	$1.37	$1.27
— Diluted earnings per share - continuing operations	$1.35	$1.24
CASH DIVIDENDS DECLARED PER SHARE	$0.30	$0.28

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]	'	'
Comprehensive income	$258	$186
Less: comprehensive income attributable to noncontrolling interests	-4	-3
TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$254	$183

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
CURRENT ASSETS	'	'
Cash and cash equivalents	$734	$796
Accounts receivable, net	1,185	1,041
Fiduciary assets	9,306	8,412
Deferred tax assets	16	15
Other current assets	204	197
Total current assets	11,445	10,461
NON-CURRENT ASSETS	'	'
Fixed assets, net	482	481
Goodwill	2,835	2,838
Other intangible assets, net	339	353
Investments in associates	196	176
Deferred tax assets	6	7
Pension benefits asset	316	278
Other non-current assets	209	206
Total non-current assets	4,383	4,339
TOTAL ASSETS	15,828	14,800
CURRENT LIABILITIES	'	'
Fiduciary liabilities	9,306	8,412
Deferred revenue and accrued expenses	371	586
Income taxes payable	53	21
Short-term debt and current portion of long-term debt	15	15
Deferred tax liabilities	36	25
Other current liabilities	495	415
Total current liabilities	10,276	9,474
NON-CURRENT LIABILITIES	'	'
Long-term debt	2,307	2,311
Liability for pension benefits	130	136
Deferred tax liabilities	78	56
Provisions for liabilities	211	206
Other non-current liabilities	354	374
Total non-current liabilities	3,080	3,083
Total liabilities	13,356	12,557
COMMITMENTS AND CONTINGENCIES	'	'
EQUITY	'	'
Preference shares, $0.000115 nominal value; Authorized: 1,000,000,000; Issued nil shares in 2014 and 2013	0	0
Additional paid-in capital	1,378	1,316
Retained earnings	1,752	1,595
Accumulated Other Comprehensive Income (Loss), Net of Tax	-685	-693
Treasury shares, at cost, 46,408 shares, $0.000115 nominal value, in 2014 and 2013 and 40,000 shares, €1 nominal value, in 2014 and 2013	-3	-3
Total Willis Group Holdings stockholders’ equity	2,442	2,215
Noncontrolling interests	30	28
Total equity	2,472	2,243
TOTAL LIABILITIES AND EQUITY	15,828	14,800
Nominal Value In Dollars [Member]	'	'
EQUITY	'	'
Ordinary shares	0	0
Nominal Value In Euros [Member]	'	'
EQUITY	'	'
Ordinary shares	$0	$0

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Dec. 31, 2013
	USD ($)	USD ($)	Nominal Value In Dollars [Member]	Nominal Value In Dollars [Member]	Nominal Value In Euros [Member]	Nominal Value In Euros [Member]
			USD ($)	USD ($)	EUR (€)	EUR (€)
Ordinary shares, nominal value	'	'	$0.00	$0.00	€ 1	€ 1
Ordinary shares, shares authorized	'	'	4,000,000,000	4,000,000,000	40,000	40,000
Ordinary shares, shares issued	'	'	179,249,064	178,861,250	40,000	40,000
Preference shares, nominal value	$0.00	$0.00	'	'	'	'
Preference shares, shares authorized	1,000,000,000	1,000,000,000	'	'	'	'
Preference shares, shares issued	0	0	'	'	'	'
Treasury shares, nominal value	'	'	$0.00	$0.00	€ 1	€ 1
Treasury stock, shares	'	'	46,408	46,408	40,000	40,000

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES	'	'
Net income	$250	$223
Adjustments to reconcile net income to total net cash provided by operating activities:	'	'
Net loss (gain) on disposal of operations and fixed and intangible assets	2	-1
Depreciation expense	23	26
Amortization of intangible assets	13	14
Amortization of cash retention awards	2	2
Net periodic income of defined benefit pension plans	-4	-1
Provision for doubtful debts	1	1
Provision for deferred income taxes	13	2
Excess tax benefits from share-based payment arrangements	-1	'
Share-based compensation	14	12
Gain on derivative instruments	-3	-4
Undistributed earnings of associates	-19	-13
Effect of exchange rate changes on net income	1	-5
Change in operating assets and liabilities, net of effects from purchase of subsidiaries:	'	'
Accounts receivable	-140	-128
Fiduciary assets	-871	-672
Fiduciary liabilities	871	672
Cash incentives paid	-315	-196
Funding of defined benefit pension plans	-28	-44
Other assets	'	-4
Other liabilities	192	142
Movement on provisions	4	13
Net cash provided by continuing operating activities	5	39
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Proceeds on disposal of fixed and intangible assets	1	4
Additions to fixed assets	-22	-23
Payments to Acquire Intangible Assets	-1	0
Acquisitions of subsidiaries, net of cash acquired	0	-1
Payments to acquire other investments	-4	-1
Proceeds on sale of operations, net of cash disposed	5	0
Net cash used in continuing investing activities	-21	-21
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Proceeds from draw down of revolving credit facilities	'	55
Debt issuance costs	-2	0
Repayments of debt	-4	-4
Repurchase of shares	-35	'
Proceeds from issue of shares	43	19
Excess tax benefits from share-based payment arrangements	1	'
Dividends paid	-50	-47
Acquisition of noncontrolling interests	0	-4
Dividends paid to noncontrolling interests	-2	-1
Net cash (used in) provided by continuing financing activities	-49	18
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	-65	36
Effect of exchange rate changes on cash and cash equivalents	3	-5
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	796	500
CASH AND CASH EQUIVALENTS, END OF PERIOD	$734	$531

NATURE_OF_OPERATIONS

NATURE OF OPERATIONS	3 Months Ended
	Mar. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
NATURE OF OPERATIONS	'
	NATURE OF OPERATIONS
	Willis provides a broad range of insurance and reinsurance broking and risk management consulting services to its clients worldwide, both directly and indirectly through its associates. The Company provides both specialized risk management advisory and consulting services on a global basis to clients engaged in specific industrial and commercial activities, and services to small, medium and large corporations through its retail operations.
	In its capacity as an advisor, insurance and reinsurance broker, the Company acts as an intermediary between clients and insurance carriers by advising clients on risk management requirements, helping clients determine the best means of managing risk, and negotiating and placing insurance risk with insurance carriers through the Company’s global distribution network.

BASIS_OF_PRESENTATION_AND_SIGN

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES	3 Months Ended
	Mar. 31, 2014
Accounting Policies [Abstract]	'
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES	'
	BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES
	The accompanying condensed consolidated financial statements (‘Interim Financial Statements’) have been prepared in accordance with accounting principles generally accepted in the United States of America (‘US GAAP’).
	The Interim Financial Statements are unaudited but include all adjustments (consisting of normal recurring adjustments) which the Company’s management considers necessary for a fair presentation of the financial position as of such dates and the operating results and cash flows for those periods. Certain information and footnote disclosures normally included in financial statements prepared in accordance with US GAAP have been condensed or omitted. However, the Company believes that the disclosures are adequate to make the information presented not misleading. The results of operations for the three months ended March 31, 2014 may not necessarily be indicative of the operating results for the entire fiscal year.
	These Interim Financial Statements should be read in conjunction with the Company’s consolidated balance sheets as of December 31, 2013 and 2012, and the related consolidated statements of operations, comprehensive income, cash flows and changes in equity for each of the three years in the period ended December 31, 2013 included in the Annual Report on Form 10-K filed with the Securities and Exchange Commission on February 27, 2014 (‘2013 10-K’).
	Effective from January 1, 2014, the Company has made changes to the presentation of certain items within the Consolidated Statements of Operations. Foreign exchange gains and losses, primarily from balance sheet revaluation, and gains and losses from the disposal of operations, previously reported within 'Total operating expenses', are reported in a new income statement line item, 'Other income (expense), net', which is reported below Operating income. Prior period amounts have been reclassified to conform to this presentation.
	In July 2013, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists - a consensus of the FASB Emerging Issues Task Force (ASU 2013-11) which provides guidance on financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward (NOL), or similar tax loss, or a tax credit carryforward exists. Such unrecognized tax benefits are required to be presented as a reduction of a deferred tax asset for a NOL or other tax credit carryforward whenever the NOL or tax credit carryforward would be available to reduce the additional taxable income or tax due if the tax position is disallowed.
	This standard is effective prospectively for annual and interim reporting periods beginning after December 15, 2013. The Company adopted the new guidance effective January 1, 2014. The Company has adopted this guidance prospectively from January 1, 2014 and has not applied the amendments to the prior reporting period. As a result of this adoption, as at March 31, 2014, other non-current liabilities and deferred tax assets have been reduced by $21 million.
	In April 2014, the FASB issued ASU No. 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity. This guidance changes the criteria for reporting discontinued operations and enhances the related disclosures around discontinued operations. The new guidance requires a disposal of a component of an entity or a group of components of an entity to be reported in discontinued operations if the disposal represents a strategic shift that has, or will have, a major effect on an entity’s operations and financial results. This guidance is effective for interim and annual periods beginning after December 15, 2014.

SALARIES_AND_BENEFITS_EXPENSE

SALARIES AND BENEFITS EXPENSE	3 Months Ended
	Mar. 31, 2014
Compensation Related Costs [Abstract]	'
SALARIES AND BENEFITS EXPENSE	'
	SALARIES AND BENEFITS EXPENSE
	Severance Costs
	Severance costs arise in the normal course of business and these charges amounted to $3 million in the three months ended March 31, 2014 (three months ended March 31, 2013: $nil).
	During the three months ended March 31, 2013, the Company incurred additional salaries and benefits costs of $29 million, of which $28 million related to severance costs, in relation to an Expense Reduction Initiative in the first quarter. These costs related to 207 positions that have been eliminated.

OTHER_INCOME_EXPENSE_NET_Notes

OTHER INCOME (EXPENSE), NET (Notes)	3 Months Ended
	Mar. 31, 2014
Other Income Expense [Abstract]	'
Other income expense [Text Block]	'
	OTHER INCOME (EXPENSE)
	Other income (expense) consists of the following:
		Three months ended March 31,
		2014			2013
		(millions)
	Loss on disposal of operations	$	(3	)	$	—
	Foreign exchange gain	3			6
	Other income (expense)	$	—		$	6

INCOME_TAXES

INCOME TAXES	3 Months Ended
	Mar. 31, 2014
Income Tax Disclosure [Abstract]	'
INCOME TAXES	'
	INCOME TAXES
	The tables below reflect the components of the three months ended March 31, 2014 and 2013 tax charge:
		Income			Tax			Effective tax
		before tax						rate
		(millions, except percentages)
	Three months ended March 31, 2014
	Non-US ordinary income taxed at estimated annual effective tax rate	$	232		$	(50	)	22	%
	US ordinary income and tax charge	65			(12		)	18	%
	Items where tax effect is treated discretely:
	Loss on disposal of operations	(3		)	1			33	%
	Net adjustment in respect of prior periods	—			(2		)	—	%
	As reported	$	294		$	(63	)	21	%
	Three months ended March 31, 2013
	Non-US ordinary income taxed at estimated annual effective tax rate	$	218		$	(45	)	21	%
	US ordinary income and tax charge	$	38		$	(3	)	8	%
	As reported	$	256		$	(48	)	19	%
	For interim income tax reporting purposes, the Company generally determines its best estimate of an annual effective tax rate and applies that rate to its year-to-date ordinary income. The Company's estimated annual effective tax rate excludes significant, unusual or infrequently occurring items and certain other items excluded pursuant to the US GAAP authoritative guidance where applicable. The income tax expense (or benefit) related to all other items is individually computed and recognized when the items occur.
	For the three months ended March 31, 2014, the reported tax rate was approximately 21 percent. The reported tax rate for the three months ended March 31, 2013 was 19 percent.
	The Company's tax rate differs from the US statutory income tax rate of 35 percent primarily due to income being subject to tax in numerous non-US jurisdictions with varying tax rates, as well as the valuation allowance maintained in the US due to losses incurred in recent years.

EARNINGS_PER_SHARE

EARNINGS PER SHARE	3 Months Ended
	Mar. 31, 2014
Earnings Per Share [Abstract]	'
EARNINGS PER SHARE	'
	EARNINGS PER SHARE
	Basic and diluted earnings per share are calculated by dividing net income attributable to Willis Group Holdings by the average number of shares outstanding during each period. The computation of diluted earnings per share reflects the potential dilution that could occur if dilutive securities and other contracts to issue shares were exercised or converted into shares or resulted in the issuance of shares that then shared in the net income of the Company.
	At March 31, 2014, time-based and performance-based options to purchase 7.0 million and 5.0 million shares (March 31, 2013: 9.6 million and 6.3 million), respectively, and 2.9 million restricted stock units (March 31, 2013: 2.4 million) were outstanding.
	Basic and diluted earnings per share are as follows:
		Three months ended March 31,
		2014			2013
		(millions, except per share data)
	Net income attributable to Willis Group Holdings	$	246		$	219
	Basic average number of shares outstanding	179			173
	Dilutive effect of potentially issuable shares	3			3
	Diluted average number of shares outstanding	182			176
	Basic earnings per share:
	Net income attributable to Willis Group Holdings shareholders	$	1.37		$	1.27
	Dilutive effect of potentially issuable shares	(0.02		)	(0.03		)
	Diluted earnings per share:
	Net income attributable to Willis Group Holdings shareholders	$	1.35		$	1.24
	Options to purchase 1.8 million shares were not included in the computation of the dilutive effect of stock options for the three months ended March 31, 2014 respectively because the effect was antidilutive (three months ended March 31, 2013: 7.8 million shares).

PENSION_PLANS

PENSION PLANS	3 Months Ended
	Mar. 31, 2014
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]	'
PENSION PLANS	'
	PENSION PLANS
	The components of the net periodic benefit (income) cost of the UK, US and other defined benefit plans are as follows:
		Three months ended March 31,
		UK Pension						US Pension						Other Pension Benefits
		Benefits						Benefits
		2014			2013			2014			2013			2014			2013
		(millions)
	Components of net periodic benefit (income) cost:
	Service cost	$	11		$	9		$	—		$	—		$	—		$	1
	Interest cost	30			27			10			10			2			1
	Expected return on plan assets	(54		)	(47		)	(13		)	(13		)	(1		)	(1		)
	Amortization of unrecognized prior service gain	(1		)	(1		)	—			—			—			—
	Amortization of unrecognized actuarial loss	11			11			1			2			—			—
	Net periodic benefit (income) cost	$	(3	)	$	(1	)	$	(2	)	$	(1	)	$	1		$	1
	During the three months ended March 31, 2014, the Company made cash contributions of $21 million (2013: $30 million) into the UK defined benefit pension plan. In addition to this, a further payment of $3 million (2013: $3 million) was made in respect of employees’ salary sacrifice contributions. Cash contributions of $2 million and $2 million (2013: $9 million and $2 million) were made to the US plan and other defined benefit pension plans, respectively.
	Contributions to the UK defined benefit pension plan in 2014 are expected to total $83 million, of which approximately $23 million relates to on-going contributions calculated as 15.9 percent of active plan members’ pensionable salaries and approximately $60 million relates to contributions towards funding the deficit.
	In addition, for full year 2014, the Company expects to contribute approximately $12 million to the UK defined benefit pension plan related to employees’ salary sacrifice contributions. The Company also expects to contribute approximately $30 million to the US plan and $9 million to the other defined benefit pension plans for the full year 2014 (inclusive of amounts contributed in the year to date).
	Further contributions will be payable into the UK pension plan based on a profit share calculation (equal to 20 percent of EBITDA in excess of $900 million per annum as defined by the revised schedule of contributions) and an exceptional return calculation (equal to 10 percent of any exceptional returns made to shareholders, for example, share buybacks and special dividends). In respect of 2014, any such contributions will be paid in 2015 on finalization of the calculations. Aggregate contributions under the deficit funding contribution and the profit share calculation are capped at £312 million ($520 million) over the six-year period ended December 31, 2017.
	The schedule of contributions is automatically renegotiated after three years and at any earlier time jointly agreed by the Company and the Trustee.

COMMITMENTS_AND_CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	3 Months Ended
	Mar. 31, 2014
Commitments and Contingencies Disclosure [Abstract]	'
COMMITMENTS AND CONTINGENCIES	'
	COMMITMENTS AND CONTINGENCIES
	Contractual Obligations
	Pensions
	The Company’s pension funding obligations are set out in Note 7 — ‘Pension Plans’.
	Other Contractual Obligations
	In July 2010, the Company made a capital commitment of $25 million to Trident V Parallel Fund, LP. As of March 31, 2014 there had been approximately $19 million of capital contributions.
	In May 2011, the Company made a capital commitment of $10 million to Dowling Capital Partners I, LP. As of March 31, 2014 there had been approximately $4 million of capital contributions.
	Claims, Lawsuits and Other Proceedings
	In the ordinary course of business, the Company is subject to various actual and potential claims, lawsuits, and other proceedings relating principally to alleged errors and omissions in connection with the placement of insurance and reinsurance. Similar to other corporations, the Company is also subject to a variety of other claims, including those relating to the Company’s employment practices. Some of the claims, lawsuits and other proceedings seek damages in amounts which could, if assessed, be significant.
	Errors and omissions claims, lawsuits, and other proceedings arising in the ordinary course of business are covered in part by professional indemnity or other appropriate insurance. The terms of this insurance vary by policy year and self-insured risks have increased significantly in recent years. Regarding self-insured risks, the Company has established provisions which are believed to be adequate in the light of current information and legal advice, and the Company adjusts such provisions from time to time according to developments.
	On the basis of current information, the Company does not expect that the actual claims, lawsuits and other proceedings to which the Company is subject, or potential claims, lawsuits, and other proceedings relating to matters of which it is aware, will ultimately have a material adverse effect on the Company’s financial condition, results of operations or liquidity. Nonetheless, given the large or indeterminate amounts sought in certain of these actions, and the inherent unpredictability of litigation and disputes with insurance companies, it is possible that an adverse outcome in certain matters could, from time to time, have a material adverse effect on the Company’s results of operations or cash flows in particular quarterly or annual periods.
	The material actual or potential claims, lawsuits, and other proceedings, of which the Company is currently aware, are:
	Stanford Financial Group Litigation
	The Company has been named as a defendant in 13 similar lawsuits relating to the collapse of The Stanford Financial Group (‘Stanford’), for which Willis of Colorado, Inc. acted as broker of record on certain lines of insurance. The complaints in these actions generally allege that the defendants actively and materially aided Stanford’s alleged fraud by providing Stanford with certain letters regarding coverage that they knew would be used to help retain or attract actual or prospective Stanford client investors. The complaints further allege that these letters, which contain statements about Stanford and the insurance policies that the defendants placed for Stanford, contained untruths and omitted material facts and were drafted in this manner to help Stanford promote and sell its allegedly fraudulent certificates of deposit.
	The 13 actions are as follows:
	•	Troice, et al. v. Willis of Colorado, Inc., et al., C.A. No. 3:09-CV-1274-N, was filed on July 2, 2009 in the U.S. District Court for the Northern District of Texas against Willis Group Holdings plc, Willis of Colorado, Inc. and a Willis associate, among others. On April 1, 2011, plaintiffs filed the operative Third Amended Class Action Complaint individually and on behalf of a putative, worldwide class of Stanford investors, adding Willis Limited as a defendant and alleging claims under Texas statutory and common law and seeking damages in excess of $1 billion, punitive damages and costs. On May 2, 2011, the defendants filed motions to dismiss the Third Amended Class Action Complaint, arguing, inter alia, that the plaintiffs’ claims are precluded by the Securities Litigation Uniform Standards Act of 1998 (‘SLUSA’).
	On May 10, 2011, the court presiding over the Stanford-related actions in the Northern District of Texas entered an order providing that it would consider the applicability of SLUSA to the Stanford-related actions based on the decision in a separate Stanford action not involving a Willis entity, Roland v. Green, Civil Action No. 3:10-CV-0224-N. On August 31, 2011, the court issued its decision in Roland, dismissing that action with prejudice under SLUSA.
	On October 27, 2011, the court in Troice entered an order (i) dismissing with prejudice those claims asserted in the Third Amended Class Action Complaint on a class basis on the grounds set forth in the Roland decision discussed above and (ii) dismissing without prejudice those claims asserted in the Third Amended Class Action Complaint on an individual basis. Also on October 27, 2011, the court entered a final judgment in the action.
	On October 28, 2011, the plaintiffs in Troice filed a notice of appeal to the U.S. Court of Appeals for the Fifth Circuit. Subsequently, Troice, Roland and a third action captioned Troice, et al. v. Proskauer Rose LLP, Civil Action No. 3:09-CV-01600-N, which also was dismissed on the grounds set forth in the Roland decision discussed above and on appeal to the U.S. Court of Appeals for the Fifth Circuit, were consolidated for purposes of briefing and oral argument. Following the completion of briefing and oral argument, on March 19, 2012, the Fifth Circuit reversed and remanded the actions. On April 2, 2012, the defendants-appellees filed petitions for rehearing en banc. On April 19, 2012, the petitions for rehearing en banc were denied. On July 18, 2012, defendants-appellees filed a petition for writ of certiorari with the United States Supreme Court regarding the Fifth Circuit's reversal in Troice. On January 18, 2013, the Supreme Court granted our petition. Opening briefs were filed on May 3, 2013 and the Supreme Court heard oral argument on October 7, 2013. On February 26, 2014, the Supreme Court affirmed the Fifth Circuit's decision.
	On March 19, 2014, the plaintiffs in Troice filed a Motion to Defer Resolution of Motions to Dismiss, to Compel Rule 26(f) Conference and For Entry of Scheduling Order. That motion has now been fully briefed by the parties and awaits disposition by the court.
	On March 25, 2014, the parties in Troice and the Janvey, et al. v. Willis of Colorado, Inc., et al. action discussed below stipulated to the consolidation of the two actions for pre-trial purposes under Rule 42(a) of the Federal Rules of Civil Procedure. On March 28, 2014, the Court “so ordered” that stipulation and, thus, consolidated Troice and Janvey for pre-trial purposes under Rule 42(a).
	•	Ranni v. Willis of Colorado, Inc., et al., C.A. No. 09-22085, was filed on July 17, 2009 against Willis Group Holdings plc and Willis of Colorado, Inc. in the U.S. District Court for the Southern District of Florida. The complaint was filed on behalf of a putative class of Venezuelan and other South American Stanford investors and alleges claims under Section 10(b) of the Securities Exchange Act of 1934 (and Rule 10b-5 thereunder) and Florida statutory and common law and seeks damages in an amount to be determined at trial. On October 6, 2009, Ranni was transferred, for consolidation or coordination with other Stanford-related actions (including Troice), to the Northern District of Texas by the U.S. Judicial Panel on Multidistrict Litigation (the ‘JPML’). The defendants have not yet responded to the complaint in Ranni.
	•	Canabal, et al. v. Willis of Colorado, Inc., et al., C.A. No. 3:09-CV-1474-D, was filed on August 6, 2009 against Willis Group Holdings plc, Willis of Colorado, Inc. and the same Willis associate named as a defendant in Troice, among others, also in the Northern District of Texas. The complaint was filed individually and on behalf of a putative class of Venezuelan Stanford investors, alleged claims under Texas statutory and common law and sought damages in excess of $1 billion, punitive damages, attorneys’ fees and costs. On December 18, 2009, the parties in Troice and Canabal stipulated to the consolidation of those actions (under the Troice civil action number), and, on December 31, 2009, the plaintiffs in Canabal filed a notice of dismissal, dismissing the action without prejudice.
	•	Rupert, et al. v. Winter, et al., Case No. 2009C115137, was filed on September 14, 2009 on behalf of 97 Stanford investors against Willis Group Holdings plc, Willis of Colorado, Inc. and the same Willis associate, among others, in Texas state court (Bexar County). The complaint alleges claims under the Securities Act of 1933, Texas and Colorado statutory law and Texas common law and seeks special, consequential and treble damages of more than $300 million, attorneys’ fees and costs. On October 20, 2009, certain defendants, including Willis of Colorado, Inc., (i) removed Rupert to the U.S. District Court for the Western District of Texas, (ii) notified the JPML of the pendency of this related action and (iii) moved to stay the action pending a determination by the JPML as to whether it should be transferred to the Northern District of Texas for consolidation or coordination with the other Stanford-related actions. On April 1, 2010, the JPML issued a final transfer order for the transfer of Rupert to the Northern District of Texas. On January 24, 2012, the court remanded Rupert to Texas state court (Bexar County), but stayed the action until further order of the court. The defendants have not yet responded to the complaint in Rupert.
	•	Casanova, et al. v. Willis of Colorado, Inc., et al., C.A. No. 3:10-CV-1862-O, was filed on September 16, 2010 on behalf of seven Stanford investors against Willis Group Holdings plc, Willis Limited, Willis of Colorado, Inc. and the same Willis associate, among others, also in the Northern District of Texas. The complaint alleges claims under Texas statutory and common law and seeks actual damages in excess of $5 million, punitive damages, attorneys’ fees and costs. The defendants have not yet responded to the complaint in Casanova.
	•	Rishmague, et ano. v. Winter, et al., Case No. 2011CI2585, was filed on March 11, 2011 on behalf of two Stanford investors, individually and as representatives of certain trusts, against Willis Group Holdings plc, Willis of Colorado, Inc., Willis of Texas, Inc. and the same Willis associate, among others, in Texas state court (Bexar County). The complaint alleges claims under Texas and Colorado statutory law and Texas common law and seeks special, consequential and treble damages of more than $37 million and attorneys’ fees and costs. On April 11, 2011, certain defendants, including Willis of Colorado, Inc., (i) removed Rishmague to the Western District of Texas, (ii) notified the JPML of the pendency of this related action and (iii) moved to stay the action pending a determination by the JPML as to whether it should be transferred to the Northern District of Texas for consolidation or coordination with the other Stanford-related actions. On August 8, 2011, the JPML issued a final transfer order for the transfer of Rishmague to the Northern District of Texas, where it is currently pending. The defendants have not yet responded to the complaint in Rishmague.
	•	MacArthur v. Winter, et al., Case No. 2013-07840, was filed on February 8, 2013 on behalf of two Stanford investors against Willis Group Holdings plc, Willis of Colorado, Inc., Willis of Texas, Inc. and the same Willis associate, among others, in Texas state court (Harris County). The complaint alleges claims under Texas and Colorado statutory law and Texas common law and seeks actual, special, consequential and treble damages of approximately $4 million and attorneys' fees and costs. On March 29, 2013, Willis of Colorado, Inc. and Willis of Texas, Inc. (i) removed MacArthur to the U.S. District Court for the Southern District of Texas and (ii) notified the JPML of the pendency of this related action. On April 2, 2013, Willis of Colorado, Inc. and Willis of Texas, Inc. filed a motion in the Southern District of Texas to stay the action pending a determination by the JPML as to whether it should be transferred to the Northern District of Texas for consolidation or coordination with the other Stanford-related actions. Also on April 2, 2013, the court presiding over MacArthur in the Southern District of Texas transferred the action to the Northern District of Texas for consolidation or coordination with the other Stanford-related actions. The defendants have not yet responded to the complaint in MacArthur.
	•	Florida suits: On February 14, 2013, five law suits were filed against Willis Group Holdings plc, Willis Limited and Willis of Colorado, Inc. in Florida state court (Miami-Dade County) alleging violations of Florida common law. The five suits are: (1) Barbar, et al. v. Willis Group Holdings Public Limited Company, et al., Case No. 13-05666CA27, filed on behalf of 35 Stanford investors seeking compensatory damages in excess of $30 million; (2) de Gadala-Maria, et al. v. Willis Group Holdings Public Limited Company, et al., Case No. 13-05669CA30, filed on behalf of 64 Stanford investors seeking compensatory damages in excess of $83.5 million; (3) Ranni, et ano. v. Willis Group Holdings Public Limited Company, et al., Case No. 13-05673CA06, filed on behalf of two Stanford investors seeking compensatory damages in excess of $3 million; (4) Tisminesky, et al. v. Willis Group Holdings Public Limited Company, et al., Case No. 13-05676CA09, filed on behalf of 11 Stanford investors seeking compensatory damages in excess of $6.5 million; and (5) Zacarias, et al. v. Willis Group Holdings Public Limited Company, et al., Case No. 13-05678CA11, filed on behalf of 10 Stanford investors seeking compensatory damages in excess of $12.5 million. On June 3, 2013, Willis of Colorado, Inc. removed all five cases to the Southern District of Florida and, on June 4, 2013, notified the JPML of the pendency of these related actions. On June 10, 2013, the court in Tisminesky issued an order sua sponte staying and administratively closing that action pending a determination by the JPML as to whether it should be transferred to the Northern District of Texas for consolidation and coordination with the other Stanford-related actions. On June 11, 2013, Willis of Colorado, Inc. moved to stay the other four actions pending the JPML's transfer decision. On June 20, 2013, the JPML issued a conditional transfer order for the transfer of the five actions to the Northern District of Texas, the transmittal of which was stayed for seven days to allow for any opposition to be filed. On June 28, 2013, with no opposition having been filed, the JPML lifted the stay, enabling the transfer to go forward. The defendants have not yet responded to the complaints in these actions.
	Janvey, et al. v. Willis of Colorado, Inc., et al., Case No. 3:13-CV-03980-D, was filed on October 1, 2013 also in for the Northern District of Texas against Willis Group Holdings plc, Willis Limited, Willis North America Inc., Willis of Colorado, Inc. and the same Willis associate. The complaint was filed (i) by Ralph S. Janvey, in his capacity as Court-Appointed Receiver for the Stanford Receivership Estate, and the Official Stanford Investors Committee (the ‘OSIC’) against all defendants and (ii) on behalf of a putative, worldwide class of Stanford investors against Willis North America Inc. Plaintiffs Janvey and the OSIC allege claims under Texas common law and the court’s Amended Order Appointing Receiver, and the putative class plaintiffs allege claims under Texas statutory and common law. Plaintiffs seek actual damages in excess of $1 billion, punitive damages and costs. On November 15, 2013, plaintiffs filed the operative First Amended Complaint, which added certain defendants unaffiliated with Willis. On February 28, 2014, the defendants filed motions to dismiss the First Amended Complaint, which motions are currently being briefed by the parties and await disposition by the court.
	•	As discussed above, on March 25, 2014, the parties in Troice and Janvey stipulated to the consolidation of the two actions for pre-trial purposes under Rule 42(a) of the Federal Rules of Civil Procedure. On March 28, 2014, the Court “so ordered” that stipulation and, thus, consolidated Troice and Janvey for pre-trial purposes under Rule 42(a).
	Additional actions could be brought in the future by other investors in certificates of deposit issued by Stanford and its affiliates. The Company disputes these allegations and intends to defend itself vigorously against these actions. The outcomes of these actions, however, including any losses or other payments that may occur as a result, cannot be predicted at this time.

DERIVATIVE_FINANCIAL_INSTRUMEN

DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES

3 Months Ended

Mar. 31, 2014

Derivative Instruments and Hedging Activities Disclosure [Abstract]

'

DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES

'

DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES

Fair Value of Derivative Financial Instruments

In addition to the note below, see Note 10 — ‘Fair Value Measurement’ for information about the fair value hierarchy of derivatives.

Primary Risks Managed by Derivative Financial Instruments

The main risks managed by derivative financial instruments are interest rate risk and foreign currency risk. The Company’s Board of Directors reviews and approves policies for managing each of these risks as summarized below.

The Company enters into derivative transactions (principally interest rate swaps and forward foreign currency contracts) in order to manage interest rate and foreign currency risks arising from the Company’s operations and its sources of finance. The Company does not hold financial or derivative instruments for trading purposes.

Interest Rate Risk — Investment Income

As a result of the Company’s operating activities, the Company receives cash for premiums and claims which it deposits in short-term investments denominated in US dollars and other currencies. The Company earns interest on these funds, which is included in the Company’s financial statements as investment income. These funds are regulated in terms of access and the instruments in which they may be invested, most of which are short-term in maturity.

In order to manage interest rate risk arising from these financial assets, the Company entered into interest rate swaps to receive a fixed rate of interest and pay a variable rate of interest denominated in the various currencies related to the short-term investments. The use of interest rate contracts essentially converted groups of short-term variable rate investments to fixed rate investments. The fair value of these contracts was recorded in other assets and other liabilities. For contracts that qualified as cash flow hedges for accounting purposes, the effective portions of changes in fair value were recorded as a component of other comprehensive income, to the extent that the hedge relationships were highly effective.

At March 31, 2014, the Company had no derivative financial instruments that were designated as cash flow hedges of interest rate risk on investments.

Interest Rate Risk — Interest Expense

The Company's operations are financed principally by $2,054 million fixed rate senior notes maturing through 2043 and $270 million under a 7-year term loan facility. The Company has access to $800 million under a revolving credit facility expiring July 23, 2018, $300 million under a revolving credit facility expiring March 3, 2015, which will be available for regulatory capital purposes related to securities underwriting only, and $22 million under two further revolving credit facilities.

The 7-year term loan facility bears interest at LIBOR plus 1.50%. As of March 31, 2014, $nil was drawn on the $800 million revolving credit facility. Drawings under that facility bear interest at LIBOR plus 1.50%. These margins apply while the Company’s debt rating remains BBB-/Baa3. Should the Company’s debt rating change, then the margin will change in accordance with the credit facilities agreements.

As of March 31, 2014, $nil was drawn on the $300 million revolving credit facility. Advances under that credit facility shall bear interest at a rate equal to (a) for Eurocurrency Loans, LIBOR plus 1.50% to 2.25%, and (b) for base rates Loans, the highest of (i) the Federal Funds rates plus 0.5%, (ii) the 'prime rate' as announced by SunTrust Bank, and (iii) LIBOR plus 1.00%, plus 0.5% to 1.25%, in each case, based upon the Company’s guaranteed senior-unsecured long term debt rating.

On April 28, 2014 the company entered in to an amendment to the $300 million revolving note and cash subordination agreement to increase the amount of financing and to extend both the end date of the original credit period and the original repayment date. As a result of this amendment, the revolving credit facility was increased from $300 million to $400 million. The end date of the credit period was extended to April 28, 2015 from March 3, 2015 and the repayment date was extended to April 28, 2016 from March 3, 2016.

The fixed rate senior notes bear interest at various rates as detailed in Note 15 — ‘Debt’.

During the three months ended March 31, 2010, the Company entered into a series of interest rate swaps for a total notional amount of $350 million to receive a fixed rate and pay a variable rate on a semi-annual basis, with a maturity date of July 15, 2015. The Company had previously designated these instruments as fair value hedges against its $350 million 5.625% senior notes due 2015 and accounted for them accordingly until the first quarter of 2013 at which point these swaps, although remaining as economic hedges, no longer qualified for hedge accounting. The Company closed out these interest rate swaps in 2013 and received a cash settlement of $13 million on termination.

Following the partial extinguishment of the 5.625% senior notes due 2015 on August 15, 2013, the Company recorded a credit of $7 million removing a corresponding partial amount of the fair value adjustment to the carrying values of the notes originally recognized in connection with the interest rate swaps. The remaining $5 million fair value adjustment at that date, will be amortized through interest expense over the period to maturity.

To hedge against the potential variability in benchmark interest rates in advance of the anticipated debt issuance, the Company entered into two short-term treasury locks during the three months ended June 30, 2013. These were closed out during the three months ended September 30, 2013 following the issue of the new senior notes described in Note 15 - 'Debt'. The fair value of these treasury locks at the close out date was $21 million, received as a cash settlement on termination.

The Company had designated the Treasury locks as effective hedges of the anticipated transaction and had recognized a gain of $19 million in other comprehensive income in relation to the effective element that qualified for hedge accounting. This amount will be reclassified into earnings consistent with the recognition of interest expense on the 4.625% senior notes due 2023 and the 6.125% senior notes due 2043. In addition, in 2013 the Company recognized a $2 million gain in interest expense for the portion of the treasury locks determined as ineffective.

Foreign Currency Risk

The Company’s primary foreign exchange risks arise:

•

from changes in the exchange rate between US dollars and Pounds sterling as its London market operations earn the majority of their revenues in US dollars and incur expenses predominantly in Pounds sterling, and may also hold a significant net sterling asset or liability position on the balance sheet. In addition, the London market operations earn significant revenues in Euros and Japanese yen; and

•

from the translation into US dollars of the net income and net assets of its foreign subsidiaries, excluding the London market operations which are US dollar denominated.

The foreign exchange risks in its London market operations are hedged as follows:

•

to the extent that forecast Pounds sterling expenses exceed Pounds sterling revenues, the Company limits its exposure to this exchange rate risk by the use of forward contracts matched to specific, clearly identified cash outflows arising in the ordinary course of business; and

•

to the extent the UK operations earn significant revenues in Euros and Japanese yen, the Company limits its exposure to changes in the exchange rate between the US dollar and these currencies by the use of forward contracts matched to a percentage of forecast cash inflows in specific currencies and periods. In addition, we are also exposed to foreign exchange risk on any net sterling asset or liability position in our London market operations.

The fair value of foreign currency contracts is recorded in other assets and other liabilities. For contracts that qualify as accounting hedges, changes in fair value resulting from movements in the spot exchange rate are recorded as a component of other comprehensive income while changes resulting from a movement in the time value are recorded in interest expense. For contracts that do not qualify for hedge accounting, the total change in fair value is recorded in interest expense. Amounts held in comprehensive income are reclassified into earnings when the hedged exposure affects earnings.

At March 31, 2014 and December 31, 2013, the Company’s foreign currency contracts were all designated as hedging instruments except those relating to short-term cash flows and hedges of certain intercompany loans.

The table below summarizes by major currency the contractual amounts of the Company’s forward contracts to exchange foreign currencies for Pounds sterling in the case of US dollars and US dollars for Euro and Japanese yen. Foreign currency notional amounts are reported in US dollars translated at contracted exchange rates.

Sell

Fair value

(millions)

US dollar

$

447

$

20

Euro

155

(2

)

Japanese yen

45

4

In addition to forward exchange contracts we undertake short-term foreign exchange swaps for liquidity purposes. These are not designated as hedges and do not qualify for hedge accounting. The fair values at March 31, 2014 and December 31, 2013 were immaterial.

During the three months ended March 31, 2014, the Company entered into a number of foreign currency transactions in order to hedge certain intercompany loans. These derivatives were not designated as hedging instruments and were for a total notional amount of $158 million (December 31, 2013: $228 million). In respect of these transactions, an immaterial amount has been recognized as an asset within other current assets and a nominal gain has been recognized in other operating expenses for the period.

Derivative Financial Instruments

The table below presents the fair value of the Company’s derivative financial instruments and their balance sheet classification at March 31, 2014 and December 31, 2013:

Fair value

Derivative financial instruments designated as hedging instruments:

Balance sheet

March 31, 2014

31-Dec-13

classification

(millions)

Assets:

Forward exchange contracts

Other assets

$

24

$

23

Total derivatives designated as hedging instruments

$

24

$

23

Liabilities:

Forward exchange contracts

Other liabilities

$

2

$

2

Total derivatives designated as hedging instruments

$

2

$

2

Cash Flow Hedges

The table below presents the effects of derivative financial instruments in cash flow hedging relationships on the consolidated statements of operations and the consolidated statements of equity for the three months ended March 31, 2014 and 2013:

Derivatives in cash flow

Amount of

Location of gain (loss)

Amount of

Location of gain (loss)

Amount of

hedging relationships

gain (loss)

reclassified from

gain (loss)

recognized in income on derivative

gain (loss)

recognized

accumulated OCI(i) into

reclassified

(ineffective hedges and ineffective

recognized

in OCI(i)on derivative (effective

income (effective element)

from

element of effective hedges)

in income on derivative

element)

accumulated

(ineffective

OCI(i) into

hedges

income

and

(effective

ineffective

element)

element of

effective

hedges)

(millions)

(millions)

(millions)

Three months ended March 31, 2014

Interest rate swaps

$

—

Investment income

$

(2

)

Other operating expenses

$

—

Forward exchange contracts

—

Other operating expenses

1

Interest expense

—

Total

$

—

$

(1

)

$

—

Three months ended March 31, 2013

Interest rate swaps

$

—

Investment income

$

(1

)

Other operating expenses

$

—

Forward exchange contracts

(13

)

Other operating expenses

(2

)

Interest expense

—

Total

$

(13

)

$

(3

)

$

—

____________________

Amounts above shown gross of tax.

(i) Other Comprehensive Income

For interest rate swaps, all components of each derivative’s gain or loss were included in the assessment of hedge effectiveness. For foreign exchange contracts, only the changes in fair value resulting from movements in the spot exchange rates are included in this assessment. In instances where the timing of expected cash flows can be matched exactly to the maturity of the foreign exchange contract, then changes in fair value attributable to movement in the forward points are also included.

At March 31, 2014, the Company estimates there will be $21 million of net derivative gains reclassified from accumulated comprehensive income into earnings within the next twelve months as the forecasted transactions affect earnings.

Fair Value Hedges

The Company had previously designated interest rate swaps as fair value hedges against its $350 million 5.625% senior notes due 2015 and accounted for them accordingly until the first quarter of 2013 at which point these swaps, although remaining as economic hedges, no longer qualified for hedge accounting.

All components of each derivative’s gain or loss were included in the assessment of hedge effectiveness.

The table below presents the effects of derivative financial instruments no longer in fair value hedging relationships on the consolidated statements of operations for the three months ended March 31, 2014 and 2013.

Derivative no longer in fair value hedging relationships

Hedged item no longer in fair value hedging relationship

(Loss) gain

Amortization of prior loss recognized on hedged item

Net gain recognized in interest expense

recognized

for

derivative

(millions)

Three months ended March 31, 2014

Interest rate swaps

5.625% senior notes due 2015

$

—

$

—

$

—

Three months ended March 31, 2013

Interest rate swaps

5.625% senior notes due 2015

$

—

$

(2

)

$

2

Credit Risk and Concentrations of Credit Risk

Credit risk represents the loss that would be recognized at the reporting date if counterparties failed to perform as contracted and from movements in interest rates and foreign exchange rates. The Company currently does not anticipate non-performance by its counterparties. The Company generally does not require collateral or other security to support financial instruments with credit risk.

Concentrations of credit risk that arise from financial instruments exist for groups of customers or counterparties when they have similar economic characteristics that would cause their ability to meet contractual obligations to be similarly affected by changes in economic or other conditions. Financial instruments on the balance sheet that potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents, accounts receivable and derivatives which are recorded at fair value.

The Company maintains a policy providing for the diversification of cash and cash equivalent investments and places such investments in an extensive number of financial institutions to limit the amount of credit risk exposure. These financial institutions are monitored on an ongoing basis for credit quality predominantly using information provided by credit agencies.

Concentrations of credit risk with respect to receivables are limited due to the large number of clients and markets in which the Company does business, as well as the dispersion across many geographic areas. Management does not believe significant risk exists in connection with the Company's concentrations of credit as of March 31, 2014.

FAIR_VALUE_MEASUREMENT

FAIR VALUE MEASUREMENT	3 Months Ended
	Mar. 31, 2014
Fair Value Disclosures [Abstract]	'
FAIR VALUE MEASUREMENT	'
	FAIR VALUE MEASUREMENT
	The Company has categorized its assets and liabilities that are measured at fair value on a recurring basis into a three-level fair value hierarchy, based on the reliability of the inputs used to determine fair value as follows:
	•	Level 1: refers to fair values determined based on quoted market prices in active markets for identical assets;
	•	Level 2: refers to fair values estimated using observable market based inputs or unobservable inputs that are corroborated by market data; and
	•	Level 3: includes fair values estimated using unobservable inputs that are not corroborated by market data.
	The following methods and assumptions were used by the Company in estimating its fair value disclosure for financial instruments:
	•	Long-term debt excluding the fair value hedge - Fair values are based on quoted market values and are therefore classified as Level 1 measurements.
	•	Derivative financial instruments - Market values have been used to determine the fair value of interest rate swaps and forward foreign exchange contracts based on estimated amounts the Company would receive or have to pay to terminate the agreements, taking into account the current interest rate environment or current foreign currency forward rates.
	Recurring basis
	The following table presents, for each of the fair value hierarchy levels, the Company's assets and liabilities that are measured at fair value on a recurring basis.
		31-Mar-14
		Quoted		Significant		Significant
		prices in		other		other
		active		observable		unobservable
		markets		inputs		inputs
		for
		identical
		assets
		Level 1		Level 2		Level 3		Total
		(millions)
	Assets at fair value:
	Cash and cash equivalents	$	734	$	—	$	—	$	734
	Fiduciary funds (included within Fiduciary assets)	1,953		—		—		1,953
	Derivative financial instruments	—		24		—		24
	Total assets	$	2,687	$	24	$	—	$	2,711
	Liabilities at fair value:
	Derivative financial instruments	—		2		—		2
	Total liabilities	$	—	$	2	$	—	$	2
		31-Dec-13
		Quoted		Significant		Significant
		prices in		other		other
		active		observable		unobservable
		markets		inputs		inputs
		for
		identical
		assets
		Level 1		Level 2		Level 3		Total
		(millions)
	Assets at fair value:
	Cash and cash equivalents	$	796	$	—	$	—	$	796
	Fiduciary funds (included within Fiduciary assets)	1,662		—		—		1,662
	Derivative financial instruments	—		23		—		23
	Total assets	$	2,458	$	23	$	—	$	2,481
	Liabilities at fair value:
	Derivative financial instruments	—		2		—		2
	Total liabilities	$	—	$	2	$	—	$	2
	The estimated fair value of the Company’s financial instruments held or issued to finance the Company’s operations is summarized below. Certain estimates and judgments were required to develop the fair value amounts. The fair value amounts shown below are not necessarily indicative of the amounts that the Company would realize upon disposition nor do they indicate the Company’s intent or ability to dispose of the financial instrument.
		31-Mar-14				31-Dec-13
		Carrying		Fair		Carrying		Fair
		amount		value		amount		value
		(millions)
	Assets:
	Derivative financial instruments	$	24	$	24	$	23	$	23
	Liabilities:
	Short-term debt	$	15	$	15	$	15	$	15
	Long-term debt	2,307		2,467		2,311		2,444
	Derivative financial instruments	2		2		2		2

GOODWILL

GOODWILL	3 Months Ended
	Mar. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
GOODWILL	'
	GOODWILL
	Goodwill represents the excess of the cost of businesses acquired over the fair market value of identifiable net assets at the dates of acquisition. Goodwill is not amortized but is subject to impairment testing annually and whenever facts or circumstances indicate that the carrying amounts may not be recoverable.
	The Company has determined that its reporting units are consistent with its operating segments: North America; International and Global. Goodwill is allocated to these reporting units based on the original purchase price allocation for acquisitions within the reporting units. When a business entity is sold, goodwill is allocated to the disposed entity based on the fair value of that entity compared with the fair value of the reporting unit in which it is included.
	The changes in the carrying amount of goodwill by segment for the three months ended March 31, 2014 and the year ended December 31, 2013 are as follows:
		Global		North			International			Total
				America
		(millions)
	Balance at January 1, 2013
	Goodwill, gross	$	1,127	$	1,792		$	400		$	3,319
	Accumulated impairment losses	—		(492		)	—			(492		)
	Goodwill, net	$	1,127	$	1,300		$	400		$	2,827
	Purchase price allocation adjustments	—		(1		)	—			(1		)
	Goodwill acquired during the year	15		—			1			16
	Goodwill disposed of during the year	—		(14		)	—			(14		)
	Other movements (i)	—		(1		)	—			(1		)
	Foreign exchange	3		—			8			11
	Balance at December 31, 2013
	Goodwill, gross	$	1,145	$	1,776		$	409		$	3,330
	Accumulated impairment losses	—		(492		)	—			(492		)
	Goodwill, net	$	1,145	$	1,284		$	409		$	2,838
	Goodwill disposed of during the period	—		(4		)	—			(4		)
	Other movements (i) (ii)	88		(45		)	(43		)	—
	Foreign exchange	1		—			—			1
	Balance at March 31, 2014
	Goodwill, gross	$	1,234	$	1,727		$	366		$	3,327
	Accumulated impairment losses	—		(492		)	—			(492		)
	Goodwill, net	$	1,234	$	1,235		$	366		$	2,835
	________________________________
	(i)	North America — $nil (2013: $1 million) tax benefit arising on the exercise of fully vested HRH stock options which were issued as part of the acquisition of HRH in 2008.
	(ii)	Effective January 1, 2014, the Company changed its internal reporting structure: UK retail, previously reported within the International segment, is now reported within the Global segment; Mexico Retail, which was previously reported within the North America segment, is now reported in the International segment; and the US captive consulting business and facultative reinsurance businesses, both previously reported within the North America segment, is now reported within the Global segment. Goodwill has been reallocated between segments using the relative fair value allocation approach.

OTHER_INTANGIBLE_ASSETS_NET

OTHER INTANGIBLE ASSETS, NET	3 Months Ended
	Mar. 31, 2014
Intangible Assets, Net (Excluding Goodwill) [Abstract]	'
OTHER INTANGIBLE ASSETS, NET	'
	OTHER INTANGIBLE ASSETS, NET
	Other intangible assets are classified into the following categories:
	•	‘Customer and Marketing Related’, including:
	•	client relationships;
	•	client lists;
	•	non-compete agreements;
	•	trade names; and
	•	‘Contract based, Technology and Other’ includes all other purchased intangible assets.
	The major classes of amortizable intangible assets are as follows:
		31-Mar-14							31-Dec-13
		Gross		Accumulated			Net		Gross		Accumulated			Net
		carrying		amortization			carrying		carrying		amortization			carrying
		amount					amount		amount					amount
		(millions)
	Customer and Marketing Related:
	Client Relationships	$	669	$	(335	)	$	334	$	671	$	(326	)	$	345
	Client Lists	3		(1		)	2		3		(1		)	2
	Non-compete Agreements	4		(1		)	3		4		(1		)	3
	Trade Names	—		—			—		2		(1		)	1
	Total Customer and Marketing Related	676		(337		)	339		680		(329		)	351
	Contract based, Technology and Other	—		—			—		5		(3		)	2
	Total amortizable intangible assets	$	676	$	(337	)	$	339	$	685	$	(332	)	$	353
	The aggregate amortization of intangible assets for the three months ended March 31, 2014 was $13 million (three months ended March 31, 2013: $14 million). The estimated aggregate amortization of intangible assets for each of the next five years ended December 31 is as follows:
		Remainder of 2014		2015			2016		2017		2018			Thereafter		Total
		(millions)
	Amortization of intangible assets	$	37	$	42		$	37	$	32	$	29		$	162	$	339

OTHER_ASSETS

OTHER ASSETS	3 Months Ended
	Mar. 31, 2014
Other Assets [Abstract]	'
OTHER ASSETS	'
	OTHER ASSETS
	An analysis of other assets is as follows:
		March 31,		31-Dec-13
		2014
		(millions)
	Other current assets
	Prepayments and accrued income	$	77	$	73
	Retention incentives	18		12
	Income tax receivable	29		32
	Deferred compensation plan assets	26		26
	Other receivables	54		54
	Total other current assets	$	204	$	197
	Other non-current assets
	Deferred compensation plan assets	$	88	$	88
	Income taxes receivable	22		21
	Accounts receivable, net	24		28
	Other investments	22		19
	Other receivables	53		50
	Total other non-current assets	$	209	$	206
	Total other assets	$	413	$	403

OTHER_LIABILITIES

OTHER LIABILITIES	3 Months Ended
	Mar. 31, 2014
Other Liabilities [Abstract]	'
OTHER LIABILITIES	'
	OTHER LIABILITIES
	An analysis of other liabilities is as follows:
		March 31,		31-Dec-13
		2014
		(millions)
	Other current liabilities
	Accounts payable	$	147	$	123
	Accrued dividends payable	55		51
	Other taxes payable	118		51
	Other payables	175		190
	Total other current liabilities	$	495	$	415
	Other non-current liabilities
	Incentives from lessors	$	184	$	183
	Deferred compensation plan liability	88		89
	Income taxes payable	22		40
	Other payables	60		62
	Total other non-current liabilities	$	354	$	374
	Total other liabilities	$	849	$	789

DEBT

DEBT	3 Months Ended
	Mar. 31, 2014
Debt Disclosure [Abstract]	'
DEBT	'
	DEBT
	Current portion of the long-term debt consists of the following:
		March 31,		31-Dec-13
		2014
		(millions)
	Current portion of 7-year term loan facility expires 2018	$	15	$	15
	Long-term debt consists of the following:
		March 31,		31-Dec-13
		2014
		(millions)
	7-year term loan facility expires 2018	$	255	$	259
	5.625% senior notes due 2015	148		148
	Fair value adjustment on 5.625% senior notes due 2015	4		4
	4.125% senior notes due 2016	299		299
	6.200% senior notes due 2017	394		394
	7.000% senior notes due 2019	187		187
	5.750% senior notes due 2021	496		496
	4.625% senior notes due 2023	249		249
	6.125% senior notes due 2043	274		274
	3-year term loan facility expires 2015	1		1
		$	2,307	$	2,311
	On July 23, 2013 we entered into an amendment to our existing credit facilities to extend both the amount of financing and the maturity date of the facilities. As a result of this amendment, our revolving credit facility was increased from $500 million to $800 million. The maturity date on the $300 million term loan was extended to July 23, 2018, from December 16, 2016. There was no increase to the amount outstanding on the term loan as a result of this amendment.
	The 7-year term loan facility expiring 2018 bears interest at LIBOR plus 1.50% and is repayable in quarterly installments and a final repayment of $186 million is due in the third quarter of 2018. Drawings under the $800 million revolving credit facility bear interest at LIBOR plus 1.50% and the facility expires on July 23, 2018. These margins apply while the Company’s debt rating remains BBB-/Baa3. As of March 31, 2014 $nil was outstanding under this revolving credit facility.
	On August 15, 2013 the Company issued $250 million of 4.625% senior notes due 2023 and $275 million of 6.125% senior notes due 2043. The effective interest rates of these senior notes are 4.696% and 6.154%, respectively, which include the impact of the discount upon issuance.
	On July 25, 2013 the Company commenced an offer to purchase for cash any and all of its 5.625% senior notes due 2015 and a portion of its 6.200% senior notes due 2017 and its 7.000% senior notes due 2019 for an aggregate purchase price of up to $525 million. On August 22, 2013 the proceeds from the issue of the senior notes due 2023 and 2043 were used to fund the purchase of $202 million of 5.625% senior notes due 2015, $206 million of 6.200% senior notes due 2017 and $113 million of 7.000% senior notes due 2019.
	On March 3, 2014 Willis Securities, Inc. a wholly-owned indirect subsidiary of Willis Group Holding Plc, entered into a $300 million revolving note and cash subordination agreement. The $300 million revolving note facility is available for drawing from March 3, 2014 through March 3, 2015; the aggregate unpaid principal amount of all advances must be repaid on or before March 4, 2016. As of March 31, 2014 $nil was outstanding under this revolving credit facility.
	On April 28, 2014 the company entered in to an amendment to the $300 million revolving note and Cash subordination agreement to increase the amount of financing and to extend both the end date of the original credit period and the original repayment date. As a result of this amendment, the revolving credit facility was increased from $300 million to $400 million.
	The end date of the credit period was extended to April 28, 2015 from March 3, 2015 and the repayment date was extended to April 28, 2016 from March 3, 2016.
	Proceeds under the credit facility will be used for regulatory capital purposes related to securities underwriting only, which will allow Willis Securities to meet or exceed capital requirements of regulatory agencies, self-regulatory agencies and their clearing houses, including the Financial Industry Regulatory Authority. Advances under the credit facility shall bear interest at a rate equal to (a) for Eurocurrency Loans, LIBOR plus 1.50% to 2.25%, and (b) for base rates Loans, the highest of (i) the Federal Funds rates plus 0.5%,(ii) the 'prime rate' as announced by SunTrust Bank, and (iii) LIBOR plus 1.00%, plus 0.5% to 1.25%, in each case, based upon the Company’s guaranteed senior-unsecured long term debt rating.

SUPPLEMENTAL_DISCLOSURES_OF_CA

SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION	3 Months Ended
	Mar. 31, 2014
Supplemental Cash Flow Information [Abstract]	'
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION	'
	SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
	Supplemental disclosures regarding cash flow information and non-cash investing and financing activities are as follows:
		Three months ended March 31,
		2014		2013
		(millions)
	Supplemental disclosures of cash flow information:
	Cash payments for income taxes, net	$	16	$	10
	Cash payments for interest	59		57
	Acquisitions:
	Fair value of assets acquired, net of cash acquired	$	—	$	3
	Less: Fair value of liabilities assumed	—		(3		)
	Net assets acquired, net of cash acquired	$	—	$	—

COMPREHENSIVE_INCOME

COMPREHENSIVE INCOME	3 Months Ended
	Mar. 31, 2014
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]	'
Comprehensive Income (Loss) Note	'
	COMPREHENSIVE INCOME (LOSS)
	The components of comprehensive income (loss) are as follows:
		Three months ended March 31,
		2014												2013
		Before tax amount				Tax				Net of tax amount				Before tax amount				Tax			Net of tax amount
		(millions)
	Other comprehensive income:
	Foreign currency translation adjustments	$	3			$	—			$	3			$	(74	)		$	—		$	(74	)
	Pension funding adjustments:
	Foreign currency translation on pension funding adjustments	(5		)		2				(3		)		53				(13		)	40
	Amortization of unrecognized actuarial loss	12				(2		)		10				13				(3		)	10
	Amortization of unrecognized prior service gain	(1		)		—				(1		)		(1		)		—			(1		)
		6				—				6				65				(16		)	49
	Derivative instruments:
	Interest rate swap reclassification adjustment	(2		)		—				(2		)		(1		)		—			(1		)
	Gain on forward exchange contracts (effective element)	—				—				—				(13		)		3			(10		)
	Forward exchange contracts reclassification adjustment	1				—				1				(2		)		1			(1		)
		(1		)		—				(1		)		(16		)		4			(12		)
	Other comprehensive income (loss)	8				—				8				(25		)		(12		)	(37		)
	Less: Other comprehensive income attributable to noncontrolling interests	—				—				—				1				—			1
	Other comprehensive income (loss) attributable to Willis Group Holdings	$	8			$	—			$	8			$	(24	)		$	(12	)	$	(36	)
	The components of accumulated other comprehensive loss, net of tax, are as follows:
			Net foreign currency translation adjustment				Pension funding adjustment				Net unrealized gain on derivative instruments				Total
			(millions)
	Balance at December 31, 2013		$	(14	)		$	(714	)		$	35			$	(693	)
	Other comprehensive income before reclassifications		3				(3		)		—				—
	Amounts reclassified from accumulated other comprehensive income		—				9				(1		)		8
	Net current-period other comprehensive income, net of tax and noncontrolling interests		3				6				(1		)		8
	Balance at March 31, 2014		$	(11	)		$	(708	)		$	34			$	(685	)
	Amounts reclassified out of accumulated other comprehensive income into the statement of operations are as follows:
	Details about accumulated other comprehensive income components		Amount reclassified from accumulated other comprehensive income								Affected line item in the statement of operations
			Three months ended March 31,
			2014				2013
			(millions)
	Gains and losses on cash flow hedges (Note 9)
	Interest rate swaps		$	(2	)		$	(1	)		Investment income
	Foreign exchange contracts		1				(2		)		Other operating expenses
			(1		)		(3		)		Total before tax
	Tax		—				1
			$	(1	)		$	(2	)		Net of tax
	Amortization of defined benefit pension items (Note 7)
	Prior service gain		$	(1	)		$	(1	)		Salaries and benefits
	Net actuarial loss		12				13				Salaries and benefits
			11				12				Total before tax
	Tax		(2		)		(3		)
			$	9			$	9			Net of tax
	Total reclassifications for the period		$	8			$	7

EQUITY_AND_NONCONTROLLING_INTE

EQUITY AND NONCONTROLLING INTERESTS	3 Months Ended
	Mar. 31, 2014
Stockholders' Equity Note [Abstract]	'
EQUITY AND NONCONTROLLING INTERESTS	'
	EQUITY AND NONCONTROLLING INTERESTS
	The components of stockholders’ equity and noncontrolling interests are as follows:
		31-Mar-14									31-Mar-13
		Willis			Noncontrolling			Total			Willis			Noncontrolling			Total
		Group			interests			equity			Group			interests			equity
		Holdings									Holdings
		stockholders									stockholders
		(millions)
	Balance at beginning of period	$	2,215		$	28		$	2,243		$	1,699		$	26		$	1,725
	Comprehensive income:
	Net income	246			4			250			219			4			223
	Other comprehensive income, net of tax	8			—			8			(36		)	(1		)	(37		)
	Comprehensive income	254			4			258			183			3			186
	Dividends	(54		)	(2		)	(56		)	(47		)	(1		)	(48		)
	Additional paid-in capital	62			—			62			33			—			33
	Repurchase of shares (i)	(35		)	—			(35		)	—			—			—
	Purchase of subsidiary shares from noncontrolling interests	—			—			—			(3		)	—			(3		)
	Balance at end of period	$	2,442		$	30		$	2,472		$	1,865		$	28		$	1,893
	_________________________________
	(i)	Based on settlement date we repurchased 825,000 shares at an average price of $42.4 in the three months ended March 31, 2014.
	The effects on equity of changes in Willis Group Holdings ownership interest in its subsidiaries are as follows:
		31-Mar-14			31-Mar-13
		(millions)
	Net income attributable to Willis Group Holdings	$	246		$	219
	Transfers from noncontrolling interest:
	Decrease in Willis Group Holdings paid-in capital for purchase of noncontrolling interests	—			(3		)
	Net transfers to noncontrolling interests	—			(3		)
	Change from net income attributable to Willis Group Holdings and transfers from noncontrolling interests	$	246		$	216

SEGMENT_INFORMATION

SEGMENT INFORMATION	3 Months Ended
	Mar. 31, 2014
Segment Reporting [Abstract]	'
SEGMENT INFORMATION	'
	SEGMENT INFORMATION
	During the periods presented, the Company operated through three segments: Global, North America and International. Global provides specialist brokerage and consulting services to clients worldwide for specific industrial and commercial activities and is organized by specialism. North America and International predominantly comprise our retail operations which provide services to small, medium and large corporations, accessing Global’s specialist expertise when required.
	Effective January 1, 2014, the Company has changed its internal reporting structure and the financial information used to evaluate performance and support decision making. As a result of these changes:
	•	the UK retail business, previously reported within the International reporting segment, has been combined with our Specialty businesses and is now reported within the Global reporting segment;
	•	the Mexican retail business, previously reported within the North America reporting segment, is now reported within the International reporting segment; and
	•	the US captive consulting business and facultative reinsurance businesses, both previously reported within the North America reporting segment, are now reported within the Global reporting segment.
	In addition to these structure changes, operating income used to evaluate performance and support decision making has changed to reflect the following: amortization of intangibles, which was previously excluded from segmental expenses, is now reported in operating expenses for each of the reporting segments; certain leadership, project and other costs relating to group functions which were previously allocated in full to the reporting segments are now retained in Corporate and other; and the non-servicing elements of the defined benefit pension schemes cost (income), which were previously included within operating expenses of the reporting segments are now retained within Corporate and other.
	The Company evaluates the performance of its segments based on organic commissions and fees growth and operating income. For internal reporting and segmental reporting, the following items for which segmental management are not held accountable are excluded from segmental expenses:
	(i)	costs of the holding company;
	(ii)	costs of group functions, leadership and projects;
	(iii)	significant legal and regulatory settlements which are managed centrally;
	(iv)	non-servicing elements of the defined benefit pension schemes cost (income);
	(v)	fees related to the extinguishment of debt; and
	(vi)	costs associated with the 2013 Expense Reduction Initiative.
	The accounting policies of the segments are consistent with those described in Note 2 — ‘Basis of Presentation and Significant Accounting Policies’ to the Company’s Annual Report on Form 10-K for the year ended December 31, 2013.
	There are no inter-segment revenues, with segments operating on a revenue-sharing basis equivalent to that used when sharing business with other third-party brokers.
	Selected information regarding the Company’s segments is as follows:
		Three months ended March 31, 2014
		Commissions			Investment			Other		Total		Depreciation		Operating
		and fees			income			income		revenues		and		income
												amortization
		(millions)
	Global	$	442		$	2		$	2	$	446	$	9	$	181
	North America	369			—			1		370		18		96
	International	279			2			—		281		5		84
	Total Segments	1,090			4			3		1,097		32		361
	Corporate and Other (i)	—			—			—		—		4		(35		)
	Total Consolidated	$	1,090		$	4		$	3	$	1,097	$	36	$	326
		Three months ended March 31, 2013
		Commissions			Investment			Other		Total		Depreciation		Operating
		and fees			income			income		revenues		and		income
												amortization
		(millions)
	Global	$	427		$	1		$	—	$	428	$	7	$	187
	North America	355			1			1		357		19		82
	International	264			2			—		266		6		78
	Total Segments	1,046			4			1		1,051		32		347
	Corporate and Other (i)	—			—			—		—		8		(66		)
	Total Consolidated	$	1,046		$	4		$	1	$	1,051	$	40	$	281
	_________________________________
	(i)	See the following table for an analysis of the ‘Corporate and Other’ line.
		Three months ended March 31,
		2014			2013
		(millions)
	Costs of the holding company	$	(2	)	$	(1	)
	Costs related to group functions, leadership and projects	(44		)	(26		)
	Significant legal and regulatory settlements managed centrally	(2		)	(3		)
	Non-servicing element of defined benefit pensions	13			10
	Expense reduction initiative (a)	—			(46		)
	Total Corporate and Other	$	(35	)	$	(66	)
	_________________________________
	(a)	Charge related to the assessment of the Company's organizational design.
	The following table reconciles total consolidated operating income, as disclosed in the segment tables above, to consolidated income before income taxes and interest in earnings of associates:
		Three months ended March 31,
		2014			2013
		(millions)
	Total consolidated operating income	$	326		$	281
	Other income (expense)	—			6
	Interest expense	(32		)	(31		)
	Income before income taxes and interest in earnings of associates	$	294		$	256

FINANCIAL_INFORMATION_FOR_PARE

FINANCIAL INFORMATION FOR PARENT GUARANTOR, OTHER GUARANTOR SUBSIDIARIES AND NON-GUARANTOR SUBSIDIARIES	3 Months Ended
	Mar. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]	'
FINANCIAL INFORMATION FOR PARENT GUARANTOR, OTHER GUARANTOR SUBSIDIARIES AND NON-GUARANTOR SUBSIDIARIES	'
	FINANCIAL INFORMATION FOR PARENT GUARANTOR, OTHER GUARANTOR SUBSIDIARIES AND NON-GUARANTOR SUBSIDIARIES
	Willis North America Inc. (‘Willis North America’) has $148 million senior notes outstanding that were issued on July 1, 2005, $394 million of senior notes issued on March 28, 2007 and $187 million of senior notes issued on September 29, 2009.
	All direct obligations under the senior notes were jointly and severally, irrevocably and fully and unconditionally guaranteed by Willis Netherlands Holdings B.V., Willis Investment UK Holdings Limited, TA I Limited, Trinity Acquisition plc and Willis Group Limited, collectively the ‘Other Guarantors’, and with Willis Group Holdings, the ‘Guarantor Companies’.
	The debt securities that were issued by Willis North America and guaranteed by the entities described above, and for which the disclosures set forth below relate and are required under applicable SEC rules, were issued under an effective registration statement.
	Presented below is condensed consolidating financial information for:
	(i)	Willis Group Holdings, which is a guarantor, on a parent company only basis;
	(ii)	the Other Guarantors, which are all 100 percent directly or indirectly owned subsidiaries of the parent and are all direct or indirect parents of the issuer;
	(iii)	the Issuer, Willis North America;
	(iv)	Other, which are the non-guarantor subsidiaries, on a combined basis;
	(v)	Consolidating adjustments; and
	(vi)	the Consolidated Company.
	The equity method has been used for investments in subsidiaries in the unaudited condensed consolidating balance sheets as of March 31, 2014 of Willis Group Holdings, the Other Guarantors and the Issuer.
	The entities included in the Other Guarantors column as of March 31, 2014 are Willis Netherlands Holdings B.V., Willis Investment UK Holdings Limited, TA I Limited, Trinity Acquisition plc and Willis Group Limited.
	Restatement to 2013 financial information
	Regulation S-X, Article 3, Rule 3-10, allows for the presentation of condensed consolidating financial information. In accordance with these rules, the condensed consolidating financial information should be presented in accordance with US GAAP, except that (i) the guarantor and non-guarantor information is presented on a combined rather than consolidated basis, which requires the elimination of intra-entity activity and (ii) investments in subsidiaries are required to be presented under the equity method of accounting. Subsequent to the issuance of our financial statements for the first quarter 2013, management determined that certain balances were not presented in accordance with the above principles and have therefore restated our condensed consolidating financial information to reflect (i) gross, rather than net, presentation of intercompany balance sheet positions, (ii) dividends received from subsidiaries as reductions to the equity method investment balances as opposed to component of investment income from group undertakings, and (iii) appropriate push down accounting for goodwill.
	The impacts of these changes on the previously reported 2013 financial statements are shown in the tables below.
		As previously reported			Reclassifications			As Reclassified
		(millions)
	Condensed consolidating statement of operations for the three months ended 31 March 2013
	Willis Group Holdings
	Operating loss	$	(4	)	$	3		$	(1	)
	Net income attributable to Willis Group Holdings	219			—			219
	The Other Guarantors
	Operating loss	$	(2	)	$	(4	)	$	(6	)
	Net income (loss) attributable to Willis Group Holdings	236			(1		)	235
	The Issuer
	Operating loss	$	(70	)	$	(1	)	$	(71	)
	Net income attributable to Willis Group Holdings	36			—			36
	Other
	Operating income	$	178		$	181		$	359
	Net income attributable to Willis Group Holdings	98			140			238
	Consolidating adjustments
	Operating income (loss)	$	185		$	(185	)	$	—
	Net loss attributable to Willis Group Holdings	(370		)	(139		)	(509		)
		As previously reported			Reclassifications			As Reclassified
		(millions)
	Condensed consolidating statement of comprehensive income for the three months ended 31 March 2013
	Willis Group Holdings
	Comprehensive income attributable to Willis Group Holdings	$	183		$	—		$	183
	The Other Guarantors
	Comprehensive income (loss) attributable to Willis Group Holdings	$	200		$	(1	)	$	199
	The Issuer
	Comprehensive income attributable to Willis Group Holdings	$	38		$	—		$	38
	Other
	Comprehensive income attributable to Willis Group Holdings	$	60		$	140		$	200
	Consolidating adjustments
	Comprehensive loss attributable to Willis Group Holdings	$	(298	)	$	(139	)	$	(437	)
		As previously reported			Reclassifications			As Reclassified
		(millions)
	Condensed consolidating statement of cash flows for the three months ended 31 March 2013
	Willis Group Holdings
	Net cash (used in) provided by operating activities	$	(25	)	$	2		$	(23	)
	Net cash provided by investing activities	—			51			51
	Net cash provided by (used in) financing activities	25			(53		)	(28		)
	The Other Guarantors
	Net cash provided by (used in) operating activities	$	27		$	(171	)	$	(144	)
	Net cash (used in) provided by investing activities	(1		)	148			147
	Net cash (used in) provided by financing activities	(24		)	23			(1		)
	The Issuer
	Net cash provided by (used in) operating activities	$	8		$	(110	)	$	(102	)
	Net cash provided by investing activities	2			10			12
	Net cash (used in) provided by financing activities	(10		)	100			90
	Other
Net cash provided by operating activities	$	29		$	279		$	308
Net cash used in investing activities	(22		)	(235		)	(257		)
Net cash provided by (used in) financing activities	27			(44		)	(17		)
Consolidating adjustments
Net cash provided by operating activities	$	—		$	—		$	—
Net cash provided by investing activities	—			26			26
Net cash used in financing activities	—			(26		)	(26		)
Condensed Consolidating Statement of Operations
	Three months ended March 31, 2014
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
REVENUES
Commissions and fees	$	—		$	—		$	2		$	1,088		$	—		$	1,090
Investment income	—			—			—			4			—			4
Other income	—			—			—			3			—			3
Total revenues	—			—			2			1,095			—			1,097
EXPENSES
Salaries and benefits	—			—			(19		)	(551		)	—			(570		)
Other operating expenses	(4		)	(24		)	(17		)	(120		)	—			(165		)
Depreciation expense	—			(1		)	(4		)	(18		)	—			(23		)
Amortization of intangible assets	—			—			—			(13		)	—			(13		)
Total expenses	(4		)	(25		)	(40		)	(702		)	—			(771		)
OPERATING (LOSS) INCOME	(4		)	(25		)	(38		)	393			—			326
Other income (expense)	—			1			—			(1		)	—			—
Income from group undertakings	—			59			43			27			(129		)	—
Expenses due to group undertakings	—			(8		)	(46		)	(75		)	129			—
Interest expense	(11		)	(9		)	(11		)	(1		)	—			(32		)
(LOSS) INCOME BEFORE INCOME TAXES AND INTEREST IN EARNINGS OF ASSOCIATES	(15		)	18			(52		)	343			—			294
Income taxes	—			5			19			(87		)	—			(63		)
(LOSS) INCOME BEFORE INTEREST IN EARNINGS OF ASSOCIATES	(15		)	23			(33		)	256			—			231
Interest in earnings of associates, net of tax	—			3			—			16			—			19
Equity account for subsidiaries	261			230			83			—			(574		)	—
NET INCOME	246			256			50			272			(574		)	250
Less: Net income attributable to noncontrolling interests	—			—			—			(4		)	—			(4		)
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	246		$	256		$	50		$	268		$	(574	)	$	246
Condensed Consolidating Statement of Comprehensive Income
	Three months ended March 31, 2014
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
Comprehensive income	$	254		$	264		$	51		$	281		$	(592	)	$	258
Less: comprehensive income attributable to noncontrolling interests	—			—			—			(4		)	—			(4		)
TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	254		$	264		$	51		$	277		$	(592	)	$	254
Condensed Consolidating Statement of Operations
	Three months ended March 31, 2013
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
REVENUES
Commissions and fees	$	—		$	—		$	—		$	1,046		$	—		$	1,046
Investment income	—			—			—			4			—			4
Other income	—			—			—			1			—			1
Total revenues	—			—			—			1,051			—			1,051
EXPENSES
Salaries and benefits	—			—			(23		)	(545		)	—			(568		)
Other operating expenses	(1		)	(6		)	(44		)	(111		)	—			(162		)
Depreciation expense	—			—			(4		)	(22		)	—			(26		)
Amortization of intangible assets	—			—			—			(14		)	—			(14		)
Total expenses	(1		)	(6		)	(71		)	(692		)	—			(770		)
OPERATING (LOSS) INCOME	(1		)	(6		)	(71		)	359			—			281
Other (expense) income	(3		)	1			—			8			—			6
Income from group undertakings	—			44			82			21			(147		)	—
Expenses due to group undertakings	—			(8		)	(31		)	(108		)	147			—
Interest expense	(11		)	(2		)	(17		)	(1		)	—			(31		)
(LOSS) INCOME BEFORE INCOME TAXES AND INTEREST IN EARNINGS OF ASSOCIATES	(15		)	29			(37		)	279			—			256
Income taxes	—			2			—			(50		)	—			(48		)
(LOSS) INCOME BEFORE INTEREST IN EARNINGS OF ASSOCIATES	(15		)	31			(37		)	229			—			208
Interest in earnings of associates, net of tax	—			2			—			13			—			15
Equity account for subsidiaries	234			202			73			—			(509		)	—
NET INCOME	219			235			36			242			(509		)	223
Less: Net income attributable to noncontrolling interests	—			—			—			(4		)	—			(4		)
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	219		$	235		$	36		$	238		$	(509	)	$	219
Condensed Consolidating Statement of Comprehensive Income
	Three months ended March 31, 2013
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
Comprehensive income	$	183		$	199		$	38		$	203		$	(437	)	$	186
Less: comprehensive income attributable to noncontrolling interests	—			—			—			(3		)	—			(3		)
TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	183		$	199		$	38		$	200		$	(437	)	$	183
Condensed Consolidating Balance Sheet
	As of March 31, 2014
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
ASSETS
CURRENT ASSETS
Cash and cash equivalents	$	3		$	3		$	—		$	728		$	—		$	734
Accounts receivable, net	1			—			4			1,180			—			1,185
Fiduciary assets	—			—			—			9,306			—			9,306
Deferred tax assets	—			—			—			16			—			16
Other current assets	1			25			28			183			(33		)	204
Amounts due from group undertakings	3,989			912			1,160			1,456			(7,517		)	—
Total current assets	3,994			940			1,192			12,869			(7,550		)	11,445
NON-CURRENT ASSETS
Investments in subsidiaries	—			3,090			1,124			—			(4,214		)	—
Fixed assets, net	—			16			48			418			—			482
Goodwill	—			—			—			2,835			—			2,835
Other intangible assets, net	—			—			—			339			—			339
Investments in associates	—			160			—			36			—			196
Deferred tax assets	—			—			—			6			—			6
Pension benefits asset	—			—			—			316			—			316
Other non-current assets	3			9			6			191			—			209
Non-current amounts due from group undertakings	—			518			703			—			(1,221		)	—
Total non-current assets	3			3,793			1,881			4,141			(5,435		)	4,383
TOTAL ASSETS	$	3,997		$	4,733		$	3,073		$	17,010		$	(12,985	)	$	15,828
LIABILITIES AND STOCKHOLDERS’ EQUITY
CURRENT LIABILITIES
Fiduciary liabilities	$	—		$	—		$	—		$	9,306		$	—		$	9,306
Deferred revenue and accrued expenses	2			—			14			355			—			371
Income taxes payable	—			—			—			86			(33		)	53
Short-term debt and current portion of long-term debt	—			15			—			—			—			15
Deferred tax liabilities	—			—			—			36			—			36
Other current liabilities	56			8			18			413			—			495
Amounts due to group undertakings	—			4,768			1,621			1,128			(7,517		)	—
Total current liabilities	58			4,791			1,653			11,324			(7,550		)	10,276
NON-CURRENT LIABILITIES
Investments in subsidiaries	702			—			—			—			(702		)	—
Long-term debt	795			778			733			1			—			2,307
Liabilities for pension benefits	—			—			—			130			—			130
Deferred tax liabilities	—			1			—			77			—			78
Provisions for liabilities	—			—			3			208			—			211
Other non-current liabilities	—			—			41			313			—			354
Non-current amounts due to group undertakings	—			—			518			703			(1,221		)	—
Total non-current liabilities	1,497			779			1,295			1,432			(1,923		)	3,080
TOTAL LIABILITIES	$	1,555		$	5,570		$	2,948		$	12,756		$	(9,473	)	$	13,356
Condensed Consolidating Balance Sheet (continued)
	As of March 31, 2014
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
EQUITY
Total Willis Group Holdings stockholders’ equity	2,442			(837		)	125			4,224			(3,512		)	2,442
Noncontrolling interests	—			—			—			30			—			30
Total equity	2,442			(837		)	125			4,254			(3,512		)	2,472
TOTAL LIABILITIES AND EQUITY	$	3,997		$	4,733		$	3,073		$	17,010		$	(12,985	)	$	15,828
Condensed Consolidating Balance Sheet
	As of December 31, 2013
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
ASSETS
CURRENT ASSETS
Cash and cash equivalents	$	3		$	3		$	—		$	790		$	—		$	796
Accounts receivable, net	—			—			4			1,037			—			1,041
Fiduciary assets	—			—			—			8,412			—			8,412
Deferred tax assets	—			—			—			16			(1		)	15
Other current assets	1			21			10			186			(21		)	197
Amounts due from group undertakings	4,051			903			1,317			1,484			(7,755		)	—
Total current assets	4,055			927			1,331			11,925			(7,777		)	10,461
NON-CURRENT ASSETS
Investments in subsidiaries	—			2,838			1,021			—			(3,859		)	—
Fixed assets, net	—			15			51			415			—			481
Goodwill	—			—			—			2,838			—			2,838
Other intangible assets, net	—			—			—			353			—			353
Investments in associates	—			156			—			20			—			176
Deferred tax assets	—			—			—			7			—			7
Pension benefits asset	—			—			—			278			—			278
Other non-current assets	4			9			5			188			—			206
Non-current amounts due from group undertakings	—			518			690			—			(1,208		)	—
Total non-current assets	4			3,536			1,767			4,099			(5,067		)	4,339
TOTAL ASSETS	$	4,059		$	4,463		$	3,098		$	16,024		$	(12,844	)	$	14,800
LIABILITIES AND STOCKHOLDERS’ EQUITY
CURRENT LIABILITIES
Fiduciary liabilities	$	—		$	—		$	—		$	8,412		$	—		$	8,412
Deferred revenue and accrued expenses	2			1			28			555			—			586
Income taxes payable	—			3			—			39			(21		)	21
Short-term debt and current portion of long-term debt	—			15			—			—			—			15
Deferred tax liabilities	—			—			—			25			—			25
Other current liabilities	62			15			38			300			—			415
Amounts due to Group undertakings	—			4,760			1,662			1,333			(7,755		)	—
Total current liabilities	64			4,794			1,728			10,664			(7,776		)	9,474
NON-CURRENT LIABILITIES
Investments in subsidiaries	985			—			—			—			(985		)	—
Long-term debt	795			782			733			1			—			2,311
Liabilities for pension benefits	—			—			—			136			—			136
Deferred tax liabilities	—			1			—			55			—			56
Provisions for liabilities	—			—			—			206			—			206
Other non-current liabilities	—			—			48			326			—			374
Non-current amounts due to Group undertakings	—			—			518			690			(1,208		)	—
Total non-current liabilities	1,780			783			1,299			1,414			(2,193		)	3,083
TOTAL LIABILITIES	$	1,844		$	5,577		$	3,027		$	12,078		$	(9,969	)	$	12,557
Condensed Consolidating Balance Sheet (continued)
	As of December 31, 2013
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
EQUITY
Total Willis Group Holdings stockholders’ equity	2,215			(1,114		)	71			3,918			(2,875		)	2,215
Noncontrolling interests	—			—			—			28			—			28
Total equity	2,215			(1,114		)	71			3,946			(2,875		)	2,243
TOTAL LIABILITIES AND EQUITY	$	4,059		$	4,463		$	3,098		$	16,024		$	(12,844	)	$	14,800
Condensed Consolidating Statement of Cash Flows
	Three months ended March 31, 2014
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	$	(23	)	$	25		$	(21	)	$	25		$	(1	)	$	5
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds on disposal of fixed and intangible assets	—			—			1			1			(1		)	1
Additions to fixed assets	—			(2		)	(2		)	(19		)	1			(22		)
Additions to intangible assets	—			—			—			(1		)	—			(1		)
Payments to acquire other investments	—			—			—			(4		)	—			(4		)
Proceeds from sales of operations, net of cash disposed	—			—			—			5			—			5
Proceeds from intercompany investing activities	65			12			120			115			(312		)	—
Repayments of intercompany investing activities	—			—			—			(16		)	16			—
Net cash provided by investing activities	65			10			119			81			(296		)	(21		)
CASH FLOWS FROM FINANCING ACTIVITIES
Debt issuance costs	—			—			—			(2		)	—			(2		)
Repayments of debt	—			(4		)	—			—			—			(4		)
Repurchase of shares	(35		)	—			—			—			—			(35		)
Proceeds from issue of shares	43			—			—			—			—			43
Excess tax benefits from share-based payment arrangements	—			—			—			1			—			1
Dividends paid	(50		)	—			—			(1		)	1			(50		)
Dividends paid to noncontrolling interests	—			—			—			(2		)	—			(2		)
Proceeds from intercompany financing activities	—			16			—			—			(16		)	—
Repayments of intercompany financing activities	—			(47		)	(98		)	(167		)	312			—
Net cash used in financing activities	(42		)	(35		)	(98		)	(171		)	297			(49		)
DECREASE IN CASH AND CASH EQUIVALENTS	—			—			—			(65		)	—			(65		)
Effect of exchange rate changes on cash and cash equivalents	—			—			—			3			—			3
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	3			3			—			790			—			796
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	3		$	3		$	—		$	728		$	—		$	734
Condensed Consolidating Statement of Cash Flows
	Three months ended March 31, 2013
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	$	(23	)	$	(144	)	$	(102	)	$	308		$	—		$	39
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds on disposal of fixed and intangible assets	—			—			2			2			—			4
Additions to fixed assets	—			(1		)	—			(22		)	—			(23		)
Acquisitions of subsidiaries, net of cash acquired	—			—			—			(1		)	—			(1		)
Payments to acquire other investments	—			—			—			(1		)	—			(1		)
Proceeds from intercompany investing activities	180			148			10			—			(338		)	—
Repayments of intercompany investing activities	(129		)	—			—			(235		)	364			—
Net cash provided by (used in) investing activities	51			147			12			(257		)	26			(21		)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from draw down of revolving credit facility	—			55			—			—			—			55
Repayments of debt	—			(4		)	—			—			—			(4		)
Proceeds from issue of shares	19			—			—			—			—			19
Dividends paid	(47		)	—			—			—			—			(47		)
Acquisition of noncontrolling interests	—			—			—			(4		)	—			(4		)
Dividends paid to noncontrolling interests	—			—			—			(1		)	—			(1		)
Proceeds from intercompany financing activities	—			128			107			129			(364		)	—
Repayments of intercompany financing activities	—			(180		)	(17		)	(141		)	338			—
Net cash (used in) provided by financing activities	(28		)	(1		)	90			(17		)	(26		)	18
INCREASE IN CASH AND CASH EQUIVALENTS	—			2			—			34			—			36
Effect of exchange rate changes on cash and cash equivalents	—			—			—			(5		)	—			(5		)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	1			—			—			499			—			500
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	1		$	2		$	—		$	528		$	—		$	531
FINANCIAL INFORMATION FOR ISSUER, PARENT GUARANTOR, OTHER GUARANTOR SUBSIDIARIES AND NON-GUARANTOR SUBSIDIARIES
Trinity Acquisition plc has $525 million senior notes outstanding that were issued on August 15, 2013.
All direct obligations under the senior notes were jointly and severally, irrevocably and fully and unconditionally guaranteed by Willis Netherlands Holdings B.V, Willis Investment UK Holdings Limited, TA I Limited, Willis Group Limited and Willis North America, Inc, collectively the 'Other Guarantors', and with Willis Group Holdings, the 'Guarantor Companies'.
The guarantor structure described above differs from the guarantor structure associated with the senior notes issued by the Company and Willis North America (the ‘Willis North America Debt Securities’) in that Trinity Acquisition plc is the issuer and not a subsidiary guarantor, and Willis North America, Inc. is a subsidiary guarantor.
Presented below is condensed consolidating financial information for:
(i)	Willis Group Holdings, which is a guarantor, on a parent company only basis;
(ii)	the Other Guarantors, which are all 100 percent directly or indirectly owned subsidiaries of the parent. Willis Netherlands B.V, Willis Investment UK Holdings Limited and TA 1 Limited are all direct or indirect parents of the issuer and Willis Group Limited and Willis North America, Inc, are 100 percent direct or indirectly owned subsidiaries or the issuer;
(iii)	Trinity Acquisition plc, which is the issuer and is a 100 percent indirectly owned subsidiary of the parent;
(iv)	Other, which are the non-guarantor subsidiaries, on a combined basis;
(v)	Consolidating adjustments; and
(vi)	the Consolidated Company.
The equity method has been used for investments in subsidiaries in the condensed consolidating balance sheets as of March 31, 2014 of Willis Group Holdings, the Other Guarantors and the Issuer.
The entities included in the Other Guarantors column as of March 31, 2014 are Willis Netherlands Holdings B.V., Willis Investment UK Holdings Limited, Willis North America, TA I Limited and Willis Group Limited.
Restatement to 2013 financial information
Regulation S-X, Article 3, Rule 3-10, allows for the presentation of condensed consolidating financial information. In accordance with these rules, the condensed consolidating financial information should be presented in accordance with US GAAP, except that (i) the guarantor and non-guarantor information is presented on a combined rather than consolidated basis, which requires the elimination of intra-entity activity and (ii) investments in subsidiaries are required to be presented under the equity method of accounting. Subsequent to the issuance of our financial statements for the first quarter 2013, management determined that certain balances were not presented in accordance with the above principles and have therefore restated our condensed consolidating financial information to reflect (i) gross, rather than net, presentation of intercompany balance sheet positions, (ii) dividends received from subsidiaries as reductions to the equity method investment balances as opposed to component of investment income from group undertakings, and (iii) appropriate push down accounting for goodwill.
The impacts of these changes on the previously reported 2013 financial statements are shown in the tables below.
	As previously reported			Reclassifications			As Reclassified
	(millions)
Condensed consolidating statement of operations for the three months ended 31 March 2013
Willis Group Holdings
Operating (loss) income	$	(4	)	$	3		$	(1	)
Net income attributable to Willis Group Holdings	219			—			219
The Other Guarantors
Operating loss	$	(72	)	$	(5	)	$	(77	)
Net income (loss) attributable to Willis Group Holdings	236			(1		)	235
The Issuer
Operating income	$	—		$	—		$	—
Net income (loss) attributable to Willis Group Holdings	223			(1		)	222
Other
Operating income	$	178		$	181		$	359
Net income attributable to Willis Group Holdings	98			140			238
Consolidating adjustments
Operating income (loss)	$	185		$	(185	)	$	—
Net loss attributable to Willis Group Holdings	(557		)	(138		)	(695		)
	As previously reported			Reclassifications			As Reclassified
	(millions)
Condensed consolidating statement of comprehensive income for the three months ended 31 March 2013
Willis Group Holdings
Comprehensive income attributable to Willis Group Holdings	$	183		$	—		$	183
The Other Guarantors
Comprehensive income (loss) attributable to Willis Group Holdings	$	200		$	(1	)	$	199
The Issuer
Comprehensive income (loss) attributable to Willis Group Holdings	$	192		$	(1	)	$	191
Other
Comprehensive income attributable to Willis Group Holdings	$	60		$	140		$	200
Consolidating adjustments
Comprehensive loss attributable to Willis Group Holdings	$	(452	)	$	(138	)	$	(590	)
	As previously reported			Reclassifications			As Reclassified
	(millions)
Condensed consolidating statement of cash flows for the three months ended 31 March 2013
Willis Group Holdings
Net cash (used in) provided by operating activities	$	(25	)	$	2		$	(23	)
Net cash provided by investing activities	—			51			51
Net cash provided by (used in) financing activities	25			(53		)	(28		)
The Other Guarantors
Net cash provided by (used in) operating activities	$	587		$	(120	)	$	467
Net cash provided by (used in) investing activities	1			(504		)	(503		)
Net cash (used in) provided by financing activities	(586		)	624			38
The Issuer
Net cash provided by (used in) operating activities	$	5		$	(161	)	$	(156	)
Net cash provided by investing activities	—			148			148
Net cash (used in) provided by financing activities	(5		)	13			8
Other
Net cash provided by (used in) operating activities	$	29		$	279		$	308
Net cash used in investing activities	(22		)	(235		)	(257		)
Net cash provided by (used in) financing activities	27			(44		)	(17		)
Consolidating adjustments
Net cash used in operating activities	$	(557	)	$	—		$	(557	)
Net cash provided by investing activities	—			540			540
Net cash provided by (used in) financing activities	557			(540		)	17
Condensed Consolidating Statement of Operations
	Three months ended March 31, 2014
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
REVENUES
Commissions and fees	$	—		$	2		$	—		$	1,088		$	—		$	1,090
Investment income	—			—			—			4			—			4
Other income	—			—			—			3			—			3
Total revenues	—			2			—			1,095			—			1,097
EXPENSES
Salaries and benefits	—			(19		)	—			(551		)	—			(570		)
Other operating expenses	(4		)	(41		)	—			(120		)	—			(165		)
Depreciation expense	—			(5		)	—			(18		)	—			(23		)
Amortization of intangible assets	—			—			—			(13		)	—			(13		)
Total expenses	(4		)	(65		)	—			(702		)	—			(771		)
OPERATING (LOSS) INCOME	(4		)	(63		)	—			393			—			326
Other income (expense)	—			1			—			(1		)	—			—
Income from group undertakings	—			82			22			27			(131		)	—
Expenses due to group undertakings	—			(49		)	(7		)	(75		)	131			—
Interest expense	(11		)	(11		)	(9		)	(1		)	—			(32		)
(LOSS) INCOME BEFORE INCOME TAXES AND INTEREST IN EARNINGS OF ASSOCIATES	(15		)	(40		)	6			343			—			294
Income taxes	—			25			(1		)	(87		)	—			(63		)
(LOSS) INCOME BEFORE INTEREST IN EARNINGS OF ASSOCIATES	(15		)	(15		)	5			256			—			231
Interest in earnings of associates, net of tax	—			3			—			16			—			19
Equity account for subsidiaries	261			268			215			—			(744		)	—
NET INCOME	246			256			220			272			(744		)	250
Less: Net income attributable to noncontrolling interests	—			—			—			(4		)	—			(4		)
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	246		$	256		$	220		$	268		$	(744	)	$	246
Condensed Consolidating Statement of Comprehensive Income
	Three months ended March 31, 2014
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
Comprehensive income	$	254		$	264		$	228		$	281		$	(769	)	$	258
Less: comprehensive income attributable to noncontrolling interests	—			—			—			(4		)	—			(4		)
TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	254		$	264		$	228		$	277		$	(769	)	$	254
Condensed Consolidating Statement of Operations
	Three months ended March 31, 2013
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
REVENUES
Commissions and fees	$	—		$	—		$	—		$	1,046		$	—		$	1,046
Investment income	—			—			—			4			—			4
Other income	—			—			—			1			—			1
Total revenues	—			—			—			1,051			—			1,051
EXPENSES
Salaries and benefits	—			(23		)	—			(545		)	—			(568		)
Other operating expenses	(1		)	(50		)	—			(111		)	—			(162		)
Depreciation expense	—			(4		)	—			(22		)	—			(26		)
Amortization of intangible assets	—			—			—			(14		)	—			(14		)
Total expenses	(1		)	(77		)	—			(692		)	—			(770		)
OPERATING (LOSS) INCOME	(1		)	(77		)	—			359			—			281
Other (expense) income	(3		)	1			—			8			—			6
Income from group undertakings	—			114			13			21			(148		)	—
Expenses due to group undertakings	—			(34		)	(6		)	(108		)	148			—
Interest expense	(11		)	(17		)	(2		)	(1		)	—			(31		)
(LOSS) INCOME BEFORE INCOME TAXES AND INTEREST IN EARNINGS OF ASSOCIATES	(15		)	(13		)	5			279			—			256
Income taxes	—			2			—			(50		)	—			(48		)
(LOSS) INCOME BEFORE INTEREST IN EARNINGS OF ASSOCIATES	(15		)	(11		)	5			229			—			208
Interest in earnings of associates, net of tax	—			2			—			13			—			15
Equity account for subsidiaries	234			244			217			—			(695		)	—
NET INCOME	219			235			222			242			(695		)	223
Less: Net income attributable to noncontrolling interests	—			—			—			(4		)	—			(4		)
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	219		$	235		$	222		$	238		$	(695	)	$	219
Condensed Consolidating Statement of Comprehensive Income
	Three months ended March 31, 2013
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
Comprehensive income	$	183		$	199		$	191		$	203		$	(590	)	$	186
Less: comprehensive income attributable to noncontrolling interests	—			—			—			(3		)	—			(3		)
TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	183		$	199		$	191		$	200		$	(590	)	$	183
Condensed Consolidating Balance Sheet
	As of March 31, 2014
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
ASSETS
CURRENT ASSETS
Cash and cash equivalents	$	3		$	3		$	—		$	728		$	—		$	734
Accounts receivable, net	1			4			—			1,180			—			1,185
Fiduciary assets	—			—			—			9,306			—			9,306
Deferred tax assets	—			—			—			16			—			16
Other current assets	1			59			1			183			(40		)	204
Amounts due from group undertakings	3,989			813			803			1,456			(7,061		)	—
Total current assets	3,994			879			804			12,869			(7,101		)	11,445
NON-CURRENT ASSETS
Investments in subsidiaries	—			4,024			2,940			—			(6,964		)	—
Fixed assets, net	—			64			—			418			—			482
Goodwill	—			—			—			2,835			—			2,835
Other intangible assets, net	—			—			—			339			—			339
Investments in associates	—			160			—			36			—			196
Deferred tax assets	—			—			—			6			—			6
Pension benefits asset	—			—			—			316			—			316
Other non-current assets	3			6			9			191			—			209
Non-current amounts due from group undertakings	—			1,132			518			—			(1,650		)	—
Total non-current assets	3			5,386			3,467			4,141			(8,614		)	4,383
TOTAL ASSETS	$	3,997		$	6,265		$	4,271		$	17,010		$	(15,715	)	$	15,828
LIABILITIES AND STOCKHOLDERS’ EQUITY
CURRENT LIABILITIES
Fiduciary liabilities	$	—		$	—		$	—		$	9,306		$	—		$	9,306
Deferred revenue and accrued expenses	2			14			—			355			—			371
Income taxes payable	—			—			7			86			(40		)	53
Short-term debt and current portion of long-term debt	—			—			15			—			—			15
Deferred tax liabilities	—			—			—			36			—			36
Other current liabilities	56			23			3			413			—			495
Amounts due to group undertakings	—			5,768			165			1,128			(7,061		)	—
Total current liabilities	58			5,805			190			11,324			(7,101		)	10,276
NON-CURRENT LIABILITIES
Investments in subsidiaries	702			—			—			—			(702		)	—
Long-term debt	795			733			778			1			—			2,307
Liabilities for pension benefits	—			—			—			130			—			130
Deferred tax liabilities	—			1			—			77			—			78
Provisions for liabilities	—			3			—			208			—			211
Other non-current liabilities	—			41			—			313			—			354
Non-current amounts due to group undertakings	—			519			428			703			(1,650		)	—
Total non-current liabilities	1,497			1,297			1,206			1,432			(2,352		)	3,080
TOTAL LIABILITIES	$	1,555		$	7,102		$	1,396		$	12,756		$	(9,453	)	$	13,356
Condensed Consolidating Balance Sheet (continued)
	As of March 31, 2014
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
EQUITY
Total Willis Group Holdings stockholders’ equity	2,442			(837		)	2,875			4,224			(6,262		)	2,442
Noncontrolling interests	—			—			—			30			—			30
Total equity	2,442			(837		)	2,875			4,254			(6,262		)	2,472
TOTAL LIABILITIES AND EQUITY	$	3,997		$	6,265		$	4,271		$	17,010		$	(15,715	)	$	15,828
Condensed Consolidating Balance Sheet
	As of December 31, 2013
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
ASSETS
CURRENT ASSETS
Cash and cash equivalents	$	3		$	3		$	—		$	790		$	—		$	796
Accounts receivable, net	—			4			—			1,037			—			1,041
Fiduciary assets	—			—			—			8,412			—			8,412
Deferred tax assets	—			—			—			16			(1		)	15
Other current assets	1			36			1			186			(27		)	197
Amounts due from group undertakings	4,051			975			793			1,484			(7,303		)	—
Total current assets	4,055			1,018			794			11,925			(7,331		)	10,461
NON-CURRENT ASSETS
Investments in subsidiaries	—			3,716			2,705			—			(6,421		)	—
Fixed assets, net	—			66			—			415			—			481
Goodwill	—			—			—			2,838			—			2,838
Other intangible assets, net	—			—			—			353			—			353
Investments in associates	—			156			—			20			—			176
Deferred tax assets	—			—			—			7			—			7
Pension benefits asset	—			—			—			278			—			278
Other non-current assets	4			5			9			188			—			206
Non-current amounts due from group undertakings	—			1,113			518			—			(1,631		)	—
Total non-current assets	4			5,056			3,232			4,099			(8,052		)	4,339
TOTAL ASSETS	$	4,059		$	6,074		$	4,026		$	16,024		$	(15,383	)	$	14,800
LIABILITIES AND STOCKHOLDERS’ EQUITY
CURRENT LIABILITIES
Fiduciary liabilities	$	—		$	—		$	—		$	8,412		$	—		$	8,412
Deferred revenue and accrued expenses	2			29			—			555			—			586
Income taxes payable	—			4			5			39			(27		)	21
Short-term debt and current portion of long-term debt	—			—			15			—			—			15
Deferred tax liabilities	—			—			—			25			—			25
Other current liabilities	62			42			11			300			—			415
Amounts due to group undertakings	—			5,813			157			1,333			(7,303		)	—
Total current liabilities	64			5,888			188			10,664			(7,330		)	9,474
NON-CURRENT LIABILITIES
Investments in subsidiaries	985			—			—			—			(985		)	—
Long-term debt	795			733			782			1			—			2,311
Liabilities for pension benefits	—			—			—			136			—			136
Deferred tax liabilities	—			1			—			55			—			56
Provisions for liabilities	—			—			—			206			—			206
Other non-current liabilities	—			48			—			326			—			374
Non-current amounts due to group undertakings	—			518			423			690			(1,631		)	—
Total non-current liabilities	1,780			1,300			1,205			1,414			(2,616		)	3,083
TOTAL LIABILITIES	$	1,844		$	7,188		$	1,393		$	12,078		$	(9,946	)	$	12,557
	As of December 31, 2013
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
EQUITY
Total Willis Group Holdings stockholders’ equity	2,215			(1,114		)	2,633			3,918			(5,437		)	2,215
Noncontrolling interests	—			—			—			28			—			28
Total equity	2,215			(1,114		)	2,633			3,946			(5,437		)	2,243
TOTAL LIABILITIES AND EQUITY	$	4,059		$	6,074		$	4,026		$	16,024		$	(15,383	)	$	14,800
Condensed Consolidating Statement of Cash Flows
	Three months ended March 31, 2014
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	$	(23	)	$	28		$	(24	)	$	25		$	(1	)	$	5
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds on disposal of fixed and intangible assets	—			1			—			1			(1		)	1
Additions to fixed assets	—			(4		)	—			(19		)	1			(22		)
Additions to intangible assets	—			—			—			(1		)	—			(1		)
Payments to acquire other investments	—			—			—			(4		)	—			(4		)
Proceeds from disposal of operations, net of cash disposed	—			—			—			5			—			5
Proceeds from intercompany investing activities	65			120			12			115			(312		)	—
Repayments of intercompany investing activities	—			—			—			(16		)	16			—
Net cash provided by investing activities	65			117			12			81			(296		)	(21		)
CASH FLOWS FROM FINANCING ACTIVITIES
Debt issuance costs	—			—			—			(2		)	—			(2		)
Repayments of debt	—			—			(4		)	—			—			(4		)
Repurchase of shares	(35		)	—			—			—			—			(35		)
Proceeds from issue of shares	43			—			—			—			—			43
Excess tax benefits from share-based payment arrangements	—			—			—			1			—			1
Dividends paid	(50		)	—			—			(1		)	1			(50		)
Dividends paid to noncontrolling interests	—			—			—			(2		)	—			(2		)
Proceeds from intercompany financing activities	—			—			16			—			(16		)	—
Repayments of intercompany financing activities	—			(145		)	—			(167		)	312			—
Net cash (used in) provided by financing activities	(42		)	(145		)	12			(171		)	297			(49		)
DECREASE IN CASH AND CASH EQUIVALENTS	—			—			—			(65		)	—			(65		)
Effect of exchange rate changes on cash and cash equivalents	—			—			—			3			—			3
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	3			3			—			790			—			796
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	3		$	3		$	—		$	728		$	—		$	734
Condensed Consolidating Statement of Cash Flows
	Three months ended March 31, 2013
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	$	(23	)	$	467		$	(156	)	$	308		$	(557	)	$	39
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds on disposal of fixed and intangible assets	—			2			—			2			—			4
Additions to fixed assets	—			(1		)	—			(22		)	—			(23		)
Acquisitions of subsidiaries, net of cash acquired	—			—			—			(1		)	—			(1		)
Payments to acquire other investments	—			—			—			(1		)	—			(1		)
Proceeds from intercompany investing activities	180			53			148			—			(381		)	—
Repayments of intercompany investing activities	(129		)	(557		)	—			(235		)	921			—
Net cash provided by (used in) investing activities	51			(503		)	148			(257		)	540			(21		)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from draw down of revolving credit facility	—			—			55			—			—			55
Repayments of debt	—			—			(4		)	—			—			(4		)
Proceeds from issue of shares	19			—			—			—			—			19
Dividends paid	(47		)	—			(557		)	—			557			(47		)
Acquisition of noncontrolling interests	—			—			—			(4		)	—			(4		)
Dividends paid to noncontrolling interests	—			—			—			(1		)	—			(1		)
Proceeds from intercompany financing activities	—			235			557			129			(921		)	—
Repayments of intercompany financing activities	—			(197		)	(43		)	(141		)	381			—
Net cash (used in) provided by financing activities	(28		)	38			8			(17		)	17			18
INCREASE IN CASH AND CASH EQUIVALENTS	—			2			—			34			—			36
Effect of exchange rate changes on cash and cash equivalents	—			—			—			(5		)	—			(5		)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	1			—			—			499			—			500
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	1		$	2		$	—		$	528		$	—		$	531

FINANCIAL_INFORMATION_FOR_PARE1

FINANCIAL INFORMATION FOR PARENT ISSUER, GUARANTOR SUBSIDIARIES AND NON-GUARANTOR SUBSIDIARIES	3 Months Ended
	Mar. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]	'
FINANCIAL INFORMATION FOR PARENT ISSUER, GUARANTOR SUBSIDIARIES AND NON-GUARANTOR SUBSIDIARIES	'
	21	FINANCIAL INFORMATION FOR PARENT ISSUER, GUARANTOR SUBSIDIARIES AND NON-GUARANTOR SUBSIDIARIES
	On March 17, 2011, the Company issued senior notes totaling $800 million in a registered public offering. These debt securities are issued by Willis Group Holdings (‘Holdings Debt Securities’) and are guaranteed by certain of the Company’s subsidiaries. Therefore, the Company is providing the unaudited condensed consolidating financial information below. The following 100 percent directly or indirectly owned subsidiaries fully and unconditionally guarantee the Holdings Debt Securities on a joint and several basis: Willis Netherlands Holdings B.V., Willis Investment UK Holdings Limited, TA I Limited, Trinity Acquisition plc, Willis Group Limited and Willis North America (the ‘Guarantors’).
	The guarantor structure described above differs from the guarantor structure associated with the senior notes issued by Willis North America (the ‘Willis North America Debt Securities’) (and for which unaudited condensed consolidating financial information is presented in Note 19) in that Willis Group Holdings is the Parent Issuer and Willis North America is a subsidiary guarantor.
	Presented below is condensed consolidating financial information for:
	(i)	Willis Group Holdings, which is the Parent Issuer;
	(ii)	the Guarantors, which are all 100 percent directly or indirectly owned subsidiaries of the parent;
	(iii)	Other, which are the non-guarantor subsidiaries, on a combined basis;
	(iv)	Consolidating adjustments; and
	(v)	the Consolidated Company.
	The equity method has been used for investments in subsidiaries in the unaudited condensed consolidating balance sheets as of March 31, 2014 of Willis Group Holdings and the Guarantors.
	The entities included in the Guarantors column as of March 31, 2014 are Willis Netherlands Holdings B.V., Willis Investment UK Holdings Limited, TA I Limited, Trinity Acquisition plc, Willis Group Limited and Willis North America.
	Restatement to 2013 financial information
	Regulation S-X, Article 3, Rule 3-10, allows for the presentation of condensed consolidating financial information. In accordance with these rules, the condensed consolidating financial information should be presented in accordance with US GAAP, except that (i) the guarantor and non-guarantor information is presented on a combined rather than consolidated basis, which requires the elimination of intra-entity activity and (ii) investments in subsidiaries are required to be presented under the equity method of accounting. Subsequent to the issuance of our financial statements for the first quarter 2013, management determined that certain balances were not presented in accordance with the above principles and have therefore restated our condensed consolidating financial information to reflect (i) gross, rather than net, presentation of intercompany balance sheet positions, (ii) dividends received from subsidiaries as reductions to the equity method investment balances as opposed to component of investment income from group undertakings, and (iii) appropriate push down accounting for goodwill.
	The impacts of these changes on the previously reported 2013 financial statements are shown in the tables below.
		As previously reported			Reclassifications			As Reclassified
		(millions)
	Condensed consolidating statement of operations for the three months ended 31 March 2013
	Willis Group Holdings - the Parent Issuer
	Operating (loss) income	$	(4	)	$	3		$	(1	)
	Net income attributable to Willis Group Holdings	219			—			219
	The Guarantors
	Operating loss	$	(72	)	$	(5	)	$	(77	)
	Net income (loss) attributable to Willis Group Holdings	236			(1		)	235
	Other
	Operating income	$	178		$	181		$	359
	Net income attributable to Willis Group Holdings	98			140			238
	Consolidating adjustments
	Operating income (loss)	$	185		$	(185	)	$	—
	Net loss attributable to Willis Group Holdings	(334		)	(139		)	(473		)
		As previously reported			Reclassifications			As Reclassified
		(millions)
	Condensed consolidating statement of comprehensive income for the three months ending 31 March 2013
	Willis Group Holdings - the Parent Issuer
	Comprehensive income attributable to Willis Group Holdings	$	183		$	—		$	183
	The Guarantors
	Comprehensive income (loss) attributable to Willis Group Holdings	$	200		$	(1	)	$	199
	Other
	Comprehensive income attributable to Willis Group Holdings	$	60		$	140		$	200
	Consolidating adjustments
	Comprehensive loss attributable to Willis Group Holdings	$	(260	)	$	(139	)	$	(399	)
		As previously reported			Reclassifications			As Reclassified
		(millions)
	Condensed consolidating statement of cash flows for the three months ending 31 March 2013
	Willis Group Holdings - the Parent Issuer
	Net cash (used in) provided by operating activities	$	(25	)	$	2		$	(23	)
	Net cash provided by investing activities	—			51			51
	Net cash provided by (used in) financing activities	25			(53		)	(28		)
	The Guarantors
	Net cash provided by (used in) operating activities	$	35		$	(281	)	$	(246	)
	Net cash provided by investing activities	1			141			142
	Net cash (used in) provided by financing activities	(34		)	140			106
	Other
	Net cash provided by operating activities	$	29		$	279		$	308
	Net cash used in investing activities	(22		)	(235		)	(257		)
	Net cash provided by (used in) financing activities	27			(44		)	(17		)
	Consolidating adjustments
	Net cash provided by operating activities	$	—		$	—		$	—
	Net cash provided by investing activities	—			43			43
	Net cash used in financing activities	—			(43		)	(43		)
	Condensed Consolidating Statement of Operations
		Three months ended March 31, 2014
		Willis			The			Other			Consolidating			Consolidated
		Group			Guarantors						adjustments
Holdings - the Parent Issuer
	(millions)
REVENUES
Commissions and fees	$	—		$	2		$	1,088		$	—		$	1,090
Investment income	—			—			4			—			4
Other income	—			—			3			—			3
Total revenues	—			2			1,095			—			1,097
EXPENSES
Salaries and benefits	—			(19		)	(551		)	—			(570		)
Other operating expenses	(4		)	(41		)	(120		)	—			(165		)
Depreciation expense	—			(5		)	(18		)	—			(23		)
Amortization of intangible assets	—			—			(13		)	—			(13		)
Total expenses	(4		)	(65		)	(702		)	—			(771		)
OPERATING (LOSS) INCOME	(4		)	(63		)	393			—			326
Other income (expense)	—			1			(1		)	—			—
Income from group undertakings	—			75			27			(102		)	—
Expenses due to group undertakings	—			(27		)	(75		)	102			—
Interest expense	(11		)	(20		)	(1		)	—			(32		)
(LOSS) INCOME BEFORE INCOME TAXES AND INTEREST IN EARNINGS OF ASSOCIATES	(15		)	(34		)	343			—			294
Income taxes	—			24			(87		)	—			(63		)
(LOSS) INCOME BEFORE INTEREST IN EARNINGS OF ASSOCIATES	(15		)	(10		)	256			—			231
Interest in earnings of associates, net of tax	—			3			16			—			19
Equity account for subsidiaries	261			263			—			(524		)	—
NET INCOME	246			256			272			(524		)	250
Less: Net income attributable to noncontrolling interests	—			—			(4		)	—			(4		)
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	246		$	256		$	268		$	(524	)	$	246
Condensed Consolidating Statement of Comprehensive Income
	Three months ended March 31, 2014
	Willis			The			Other			Consolidating			Consolidated
	Group			Guarantors						adjustments
	Holdings - the Parent Issuer
	(millions)
Comprehensive income	$	254		$	264		$	281		$	(541	)	$	258
Less: comprehensive income attributable to noncontrolling interests	—			—			(4		)	—			(4		)
TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	254		$	264		$	277		$	(541	)	$	254
Condensed Consolidating Statement of Operations
	Three months ended March 31, 2013
	Willis			The			Other			Consolidating			Consolidated
	Group			Guarantors						adjustments
	Holdings - the Parent Issuer
	(millions)
REVENUES
Commissions and fees	$	—		$	—		$	1,046		$	—		$	1,046
Investment income	—			—			4			—			4
Other income	—			—			1			—			1
Total revenues	—			—			1,051			—			1,051
EXPENSES
Salaries and benefits	—			(23		)	(545		)	—			(568		)
Other operating expenses	(1		)	(50		)	(111		)	—			(162		)
Depreciation expense	—			(4		)	(22		)	—			(26		)
Amortization of intangible assets	—			—			(14		)	—			(14		)
Total expenses	(1		)	(77		)	(692		)	—			(770		)
OPERATING (LOSS) INCOME	(1		)	(77		)	359			—			281
Other (expense) income	(3		)	1			8			—			6
Income from group undertakings	—			108			21			(129		)	—
Expenses due to group undertakings	—			(21		)	(108		)	129			—
Interest expense	(11		)	(19		)	(1		)	—			(31		)
(LOSS) INCOME BEFORE INCOME TAXES AND INTEREST IN EARNINGS OF ASSOCIATES	(15		)	(8		)	279			—			256
Income taxes	—			2			(50		)	—			(48		)
(LOSS) INCOME BEFORE INTEREST IN EARNINGS OF ASSOCIATES	(15		)	(6		)	229			—			208
Interest in earnings of associates, net of tax	—			2			13			—			15
Equity account for subsidiaries	234			239			—			(473		)	—
NET INCOME	219			235			242			(473		)	223
Less: Net income attributable to noncontrolling interests	—			—			(4		)	—			(4		)
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	219		$	235		$	238		$	(473	)	$	219
Condensed Consolidating Statement of Comprehensive Income
	Three months ended March 31, 2013
	Willis			The			Other			Consolidating			Consolidated
	Group			Guarantors						adjustments
	Holdings - the Parent Issuer
	(millions)
Comprehensive income	$	183		$	199		$	203		$	(399	)	$	186
Less: comprehensive income attributable to noncontrolling interests	—			—			(3		)	—			(3		)
TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	183		$	199		$	200		$	(399	)	$	183
Condensed Consolidating Balance Sheet
	As of March 31, 2014
	Willis			The Guarantors			Other			Consolidating			Consolidated
	Group									adjustments
	Holdings - the Parent Issuer
	(millions)
ASSETS
CURRENT ASSETS
Cash and cash equivalents	$	3		$	3		$	728		$	—		$	734
Accounts receivable, net	1			4			1,180			—			1,185
Fiduciary assets	—			—			9,306			—			9,306
Deferred tax assets	—			—			16			—			16
Other current assets	1			53			183			(33		)	204
Amounts due from group undertakings	3,989			813			1,456			(6,258		)	—
Total current assets	3,994			873			12,869			(6,291		)	11,445
NON-CURRENT ASSETS
Investments in subsidiaries	—			4,089			—			(4,089		)	—
Fixed assets, net	—			64			418			—			482
Goodwill	—			—			2,835			—			2,835
Other intangible assets, net	—			—			339			—			339
Investments in associates	—			160			36			—			196
Deferred tax assets	—			—			6			—			6
Pension benefits asset	—			—			316			—			316
Other non-current assets	3			15			191			—			209
Non-current amounts due from group undertakings	—			703			—			(703		)	—
Total non-current assets	3			5,031			4,141			(4,792		)	4,383
TOTAL ASSETS	$	3,997		$	5,904		$	17,010		$	(11,083	)	$	15,828
LIABILITIES AND STOCKHOLDERS’ EQUITY
CURRENT LIABILITIES
Fiduciary liabilities	$	—		$	—		$	9,306		$	—		$	9,306
Deferred revenue and accrued expenses	2			14			355			—			371
Income taxes payable	—			—			86			(33		)	53
Short-term debt and current portion of long-term debt	—			15			—			—			15
Deferred tax liabilities	—			—			36			—			36
Other current liabilities	56			26			413			—			495
Amounts due to group undertakings	—			5,130			1,128			(6,258		)	—
Total current liabilities	58			5,185			11,324			(6,291		)	10,276
NON-CURRENT LIABILITIES
Investments in subsidiaries	702			—			—			(702		)	—
Long-term debt	795			1,511			1			—			2,307
Liabilities for pension benefits	—			—			130			—			130
Deferred tax liabilities	—			1			77			—			78
Provisions for liabilities	—			3			208			—			211
Other non-current liabilities	—			41			313			—			354
Non-current amounts due to group undertakings	—			—			703			(703		)	—
Total non-current liabilities	1,497			1,556			1,432			(1,405		)	3,080
TOTAL LIABILITIES	$	1,555		$	6,741		$	12,756		$	(7,696	)	$	13,356
Condensed Consolidating Balance Sheet (continued)
	As of March 31, 2014
	Willis			The Guarantors			Other			Consolidating			Consolidated
	Group									adjustments
	Holdings - the Parent Issuer
	(millions)
EQUITY
Total Willis Group Holdings stockholders’ equity	2,442			(837		)	4,224			(3,387		)	2,442
Noncontrolling interests	—			—			30			—			30
Total equity	2,442			(837		)	4,254			(3,387		)	2,472
TOTAL LIABILITIES AND EQUITY	$	3,997		$	5,904		$	17,010		$	(11,083	)	$	15,828
Condensed Consolidating Balance Sheet
	As of December 31, 2013
	Willis			The Guarantors			Other			Consolidating			Consolidated
	Group									adjustments
	Holdings - the Parent Issuer
	(millions)
ASSETS
CURRENT ASSETS
Cash and cash equivalents	$	3		$	3		$	790		$	—		$	796
Accounts receivable, net	—			4			1,037			—			1,041
Fiduciary assets	—			—			8,412			—			8,412
Deferred tax assets	—			—			16			(1		)	15
Other current assets	1			31			186			(21		)	197
Amounts due to group undertakings	4,051			975			1,484			(6,510		)	—
Total current assets	4,055			1,013			11,925			(6,532		)	10,461
NON-CURRENT ASSETS
Investments in subsidiaries	—			3,788			—			(3,788		)	—
Fixed assets, net	—			66			415			—			481
Goodwill	—			—			2,838			—			2,838
Other intangible assets, net	—			—			353			—			353
Investments in associates	—			156			20			—			176
Deferred tax assets	—			—			7			—			7
Pension benefits asset	—			—			278			—			278
Other non-current assets	4			14			188			—			206
Non-current amounts due to group undertakings	—			690			—			(690		)	—
Total non-current assets	4			4,714			4,099			(4,478		)	4,339
TOTAL ASSETS	$	4,059		$	5,727		$	16,024		$	(11,010	)	$	14,800
LIABILITIES AND STOCKHOLDERS’ EQUITY
CURRENT LIABILITIES
Fiduciary liabilities	$	—		$	—		$	8,412		$	—		$	8,412
Deferred revenue and accrued expenses	2			29			555			—			586
Income taxes payable	—			3			39			(21		)	21
Short-term debt and current portion of long-term debt	—			15			—			—			15
Deferred tax liabilities	—			—			25			—			25
Other current liabilities	62			53			300			—			415
Amounts due to group undertakings	—			5,177			1,333			(6,510		)	—
Total current liabilities	64			5,277			10,664			(6,531		)	9,474
NON-CURRENT LIABILITIES
Investments in subsidiaries	985			—			—			(985		)	—
Long-term debt	795			1,515			1			—			2,311
Liabilities for pension benefits	—			—			136			—			136
Deferred tax liabilities	—			1			55			—			56
Provisions for liabilities	—			—			206			—			206
Other non-current liabilities	—			48			326			—			374
Non-current amounts due to group undertakings	—			—			690			(690		)	—
Total non-current liabilities	1,780			1,564			1,414			(1,675		)	3,083
TOTAL LIABILITIES	$	1,844		$	6,841		$	12,078		$	(8,206	)	$	12,557
Condensed Consolidating Balance Sheet (continued)
	As of December 31, 2013
	Willis			The Guarantors			Other			Consolidating			Consolidated
	Group									adjustments
	Holdings - the Parent Issuer
	(millions)
EQUITY
Total Willis Group Holdings stockholders’ equity	2,215			(1,114		)	3,918			(2,804		)	2,215
Noncontrolling interests	—			—			28			—			28
Total equity	2,215			(1,114		)	3,946			(2,804		)	2,243
TOTAL LIABILITIES AND EQUITY	$	4,059		$	5,727		$	16,024		$	(11,010	)	$	14,800
Condensed Consolidating Statement of Cash Flows
	Three months ended March 31, 2014
	Willis			The Guarantors			Other			Consolidating			Consolidated
	Group									adjustments
	Holdings - the Parent Issuer
	(millions)
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	$	(23	)	$	4		$	25		$	(1	)	$	5
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds on disposal of fixed and intangible assets	—			1			1			(1		)	1
Additions to fixed assets	—			(4		)	(19		)	1			(22		)
Additions to intangible assets	—			—			(1		)	—			(1		)
Payments to acquire other investments	—			—			(4		)	—			(4		)
Proceeds from disposal of operations, net of cash disposed	—			—			5			—			5
Proceeds from intercompany investing activities	65			120			115			(300		)	—
Repayments of intercompany investing activities	—			—			(16		)	16			—
Net cash provided by investing activities	65			117			81			(284		)	(21		)
CASH FLOWS FROM FINANCING ACTIVITIES
Debt issuance costs	—			—			(2		)	—			(2		)
Repayments of debt	—			(4		)	—			—			(4		)
Repurchase of shares	(35		)	—			—			—			(35		)
Proceeds from issue of shares	43			—			—			—			43
Excess tax benefits from share-based payment arrangement	—			—			1			—			1
Dividends paid	(50		)	—			(1		)	1			(50		)
Dividends paid to noncontrolling interests	—			—			(2		)	—			(2		)
Proceeds from intercompany financing activities	—			16			—			(16		)	—
Repayments of intercompany financing activities	—			(133		)	(167		)	300			—
Net cash used in financing activities	(42		)	(121		)	(171		)	285			(49		)
DECREASE IN CASH AND CASH EQUIVALENTS	—			—			(65		)	—			(65		)
Effect of exchange rate changes on cash and cash equivalents	—			—			3			—			3
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	3			3			790			—			796
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	3		$	3		$	728		$	—		$	734
Condensed Consolidating Statement of Cash Flows
	Three months ended March 31, 2013
	Willis			The Guarantors			Other			Consolidating			Consolidated
	Group									adjustments
	Holdings - the Parent Issuer
	(millions)
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	$	(23	)	$	(246	)	$	308		$	—		$	39
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds on disposal of fixed and intangible assets	—			2			2			—			4
Additions to fixed assets	—			(1		)	(22		)	—			(23		)
Acquisitions of subsidiaries, net of cash acquired	—			—			(1		)	—			(1		)
Payments to acquire other investments	—			—			(1		)	—			(1		)
Proceeds from intercompany investing activities	180			141			—			(321		)	—
Repayments of intercompany investing activities	(129		)	—			(235		)	364			—
Net cash provided by (used in) investing activities	51			142			(257		)	43			(21		)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from draw down of revolving credit facility	—			55			—			—			55
Repayments of debt	—			(4		)	—			—			(4		)
Proceeds from issue of shares	19			—			—			—			19
Dividends paid	(47		)	—			—			—			(47		)
Acquisition of noncontrolling interests	—			—			(4		)	—			(4		)
Dividends paid to noncontrolling interests	—			—			(1		)	—			(1		)
Proceeds from intercompany financing activities	—			235			129			(364		)	—
Repayments of intercompany financing activities	—			(180		)	(141		)	321			—
Net cash (used in) provided by financing activities	(28		)	106			(17		)	(43		)	18
INCREASE IN CASH AND CASH EQUIVALENTS	—			2			34			—			36
Effect of exchange rate changes on cash and cash equivalents	—			—			(5		)	—			(5		)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	1			—			499			—			500
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	1		$	2		$	528		$	—		$	531

FINANCIAL_INFORMATION_FOR_ISSU

FINANCIAL INFORMATION FOR ISSUER, PARENT GUARANTOR, OTHER GUARANTOR SUBSIDIARIES AND NON-GUARANTOR SUBSIDIARIES (Notes)	3 Months Ended
	Mar. 31, 2014
Condensed Financial Statements, Captions [Line Items]	'
Financial Information for issuer, Parent guarantor, guarantor subsidiaries and non-guarantor subsidiaries [Text Block]	'
	FINANCIAL INFORMATION FOR PARENT GUARANTOR, OTHER GUARANTOR SUBSIDIARIES AND NON-GUARANTOR SUBSIDIARIES
	Willis North America Inc. (‘Willis North America’) has $148 million senior notes outstanding that were issued on July 1, 2005, $394 million of senior notes issued on March 28, 2007 and $187 million of senior notes issued on September 29, 2009.
	All direct obligations under the senior notes were jointly and severally, irrevocably and fully and unconditionally guaranteed by Willis Netherlands Holdings B.V., Willis Investment UK Holdings Limited, TA I Limited, Trinity Acquisition plc and Willis Group Limited, collectively the ‘Other Guarantors’, and with Willis Group Holdings, the ‘Guarantor Companies’.
	The debt securities that were issued by Willis North America and guaranteed by the entities described above, and for which the disclosures set forth below relate and are required under applicable SEC rules, were issued under an effective registration statement.
	Presented below is condensed consolidating financial information for:
	(i)	Willis Group Holdings, which is a guarantor, on a parent company only basis;
	(ii)	the Other Guarantors, which are all 100 percent directly or indirectly owned subsidiaries of the parent and are all direct or indirect parents of the issuer;
	(iii)	the Issuer, Willis North America;
	(iv)	Other, which are the non-guarantor subsidiaries, on a combined basis;
	(v)	Consolidating adjustments; and
	(vi)	the Consolidated Company.
	The equity method has been used for investments in subsidiaries in the unaudited condensed consolidating balance sheets as of March 31, 2014 of Willis Group Holdings, the Other Guarantors and the Issuer.
	The entities included in the Other Guarantors column as of March 31, 2014 are Willis Netherlands Holdings B.V., Willis Investment UK Holdings Limited, TA I Limited, Trinity Acquisition plc and Willis Group Limited.
	Restatement to 2013 financial information
	Regulation S-X, Article 3, Rule 3-10, allows for the presentation of condensed consolidating financial information. In accordance with these rules, the condensed consolidating financial information should be presented in accordance with US GAAP, except that (i) the guarantor and non-guarantor information is presented on a combined rather than consolidated basis, which requires the elimination of intra-entity activity and (ii) investments in subsidiaries are required to be presented under the equity method of accounting. Subsequent to the issuance of our financial statements for the first quarter 2013, management determined that certain balances were not presented in accordance with the above principles and have therefore restated our condensed consolidating financial information to reflect (i) gross, rather than net, presentation of intercompany balance sheet positions, (ii) dividends received from subsidiaries as reductions to the equity method investment balances as opposed to component of investment income from group undertakings, and (iii) appropriate push down accounting for goodwill.
	The impacts of these changes on the previously reported 2013 financial statements are shown in the tables below.
		As previously reported			Reclassifications			As Reclassified
		(millions)
	Condensed consolidating statement of operations for the three months ended 31 March 2013
	Willis Group Holdings
	Operating loss	$	(4	)	$	3		$	(1	)
	Net income attributable to Willis Group Holdings	219			—			219
	The Other Guarantors
	Operating loss	$	(2	)	$	(4	)	$	(6	)
	Net income (loss) attributable to Willis Group Holdings	236			(1		)	235
	The Issuer
	Operating loss	$	(70	)	$	(1	)	$	(71	)
	Net income attributable to Willis Group Holdings	36			—			36
	Other
	Operating income	$	178		$	181		$	359
	Net income attributable to Willis Group Holdings	98			140			238
	Consolidating adjustments
	Operating income (loss)	$	185		$	(185	)	$	—
	Net loss attributable to Willis Group Holdings	(370		)	(139		)	(509		)
		As previously reported			Reclassifications			As Reclassified
		(millions)
	Condensed consolidating statement of comprehensive income for the three months ended 31 March 2013
	Willis Group Holdings
	Comprehensive income attributable to Willis Group Holdings	$	183		$	—		$	183
	The Other Guarantors
	Comprehensive income (loss) attributable to Willis Group Holdings	$	200		$	(1	)	$	199
	The Issuer
	Comprehensive income attributable to Willis Group Holdings	$	38		$	—		$	38
	Other
	Comprehensive income attributable to Willis Group Holdings	$	60		$	140		$	200
	Consolidating adjustments
	Comprehensive loss attributable to Willis Group Holdings	$	(298	)	$	(139	)	$	(437	)
		As previously reported			Reclassifications			As Reclassified
		(millions)
	Condensed consolidating statement of cash flows for the three months ended 31 March 2013
	Willis Group Holdings
	Net cash (used in) provided by operating activities	$	(25	)	$	2		$	(23	)
	Net cash provided by investing activities	—			51			51
	Net cash provided by (used in) financing activities	25			(53		)	(28		)
	The Other Guarantors
	Net cash provided by (used in) operating activities	$	27		$	(171	)	$	(144	)
	Net cash (used in) provided by investing activities	(1		)	148			147
	Net cash (used in) provided by financing activities	(24		)	23			(1		)
	The Issuer
	Net cash provided by (used in) operating activities	$	8		$	(110	)	$	(102	)
	Net cash provided by investing activities	2			10			12
	Net cash (used in) provided by financing activities	(10		)	100			90
	Other
Net cash provided by operating activities	$	29		$	279		$	308
Net cash used in investing activities	(22		)	(235		)	(257		)
Net cash provided by (used in) financing activities	27			(44		)	(17		)
Consolidating adjustments
Net cash provided by operating activities	$	—		$	—		$	—
Net cash provided by investing activities	—			26			26
Net cash used in financing activities	—			(26		)	(26		)
Condensed Consolidating Statement of Operations
	Three months ended March 31, 2014
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
REVENUES
Commissions and fees	$	—		$	—		$	2		$	1,088		$	—		$	1,090
Investment income	—			—			—			4			—			4
Other income	—			—			—			3			—			3
Total revenues	—			—			2			1,095			—			1,097
EXPENSES
Salaries and benefits	—			—			(19		)	(551		)	—			(570		)
Other operating expenses	(4		)	(24		)	(17		)	(120		)	—			(165		)
Depreciation expense	—			(1		)	(4		)	(18		)	—			(23		)
Amortization of intangible assets	—			—			—			(13		)	—			(13		)
Total expenses	(4		)	(25		)	(40		)	(702		)	—			(771		)
OPERATING (LOSS) INCOME	(4		)	(25		)	(38		)	393			—			326
Other income (expense)	—			1			—			(1		)	—			—
Income from group undertakings	—			59			43			27			(129		)	—
Expenses due to group undertakings	—			(8		)	(46		)	(75		)	129			—
Interest expense	(11		)	(9		)	(11		)	(1		)	—			(32		)
(LOSS) INCOME BEFORE INCOME TAXES AND INTEREST IN EARNINGS OF ASSOCIATES	(15		)	18			(52		)	343			—			294
Income taxes	—			5			19			(87		)	—			(63		)
(LOSS) INCOME BEFORE INTEREST IN EARNINGS OF ASSOCIATES	(15		)	23			(33		)	256			—			231
Interest in earnings of associates, net of tax	—			3			—			16			—			19
Equity account for subsidiaries	261			230			83			—			(574		)	—
NET INCOME	246			256			50			272			(574		)	250
Less: Net income attributable to noncontrolling interests	—			—			—			(4		)	—			(4		)
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	246		$	256		$	50		$	268		$	(574	)	$	246
Condensed Consolidating Statement of Comprehensive Income
	Three months ended March 31, 2014
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
Comprehensive income	$	254		$	264		$	51		$	281		$	(592	)	$	258
Less: comprehensive income attributable to noncontrolling interests	—			—			—			(4		)	—			(4		)
TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	254		$	264		$	51		$	277		$	(592	)	$	254
Condensed Consolidating Statement of Operations
	Three months ended March 31, 2013
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
REVENUES
Commissions and fees	$	—		$	—		$	—		$	1,046		$	—		$	1,046
Investment income	—			—			—			4			—			4
Other income	—			—			—			1			—			1
Total revenues	—			—			—			1,051			—			1,051
EXPENSES
Salaries and benefits	—			—			(23		)	(545		)	—			(568		)
Other operating expenses	(1		)	(6		)	(44		)	(111		)	—			(162		)
Depreciation expense	—			—			(4		)	(22		)	—			(26		)
Amortization of intangible assets	—			—			—			(14		)	—			(14		)
Total expenses	(1		)	(6		)	(71		)	(692		)	—			(770		)
OPERATING (LOSS) INCOME	(1		)	(6		)	(71		)	359			—			281
Other (expense) income	(3		)	1			—			8			—			6
Income from group undertakings	—			44			82			21			(147		)	—
Expenses due to group undertakings	—			(8		)	(31		)	(108		)	147			—
Interest expense	(11		)	(2		)	(17		)	(1		)	—			(31		)
(LOSS) INCOME BEFORE INCOME TAXES AND INTEREST IN EARNINGS OF ASSOCIATES	(15		)	29			(37		)	279			—			256
Income taxes	—			2			—			(50		)	—			(48		)
(LOSS) INCOME BEFORE INTEREST IN EARNINGS OF ASSOCIATES	(15		)	31			(37		)	229			—			208
Interest in earnings of associates, net of tax	—			2			—			13			—			15
Equity account for subsidiaries	234			202			73			—			(509		)	—
NET INCOME	219			235			36			242			(509		)	223
Less: Net income attributable to noncontrolling interests	—			—			—			(4		)	—			(4		)
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	219		$	235		$	36		$	238		$	(509	)	$	219
Condensed Consolidating Statement of Comprehensive Income
	Three months ended March 31, 2013
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
Comprehensive income	$	183		$	199		$	38		$	203		$	(437	)	$	186
Less: comprehensive income attributable to noncontrolling interests	—			—			—			(3		)	—			(3		)
TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	183		$	199		$	38		$	200		$	(437	)	$	183
Condensed Consolidating Balance Sheet
	As of March 31, 2014
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
ASSETS
CURRENT ASSETS
Cash and cash equivalents	$	3		$	3		$	—		$	728		$	—		$	734
Accounts receivable, net	1			—			4			1,180			—			1,185
Fiduciary assets	—			—			—			9,306			—			9,306
Deferred tax assets	—			—			—			16			—			16
Other current assets	1			25			28			183			(33		)	204
Amounts due from group undertakings	3,989			912			1,160			1,456			(7,517		)	—
Total current assets	3,994			940			1,192			12,869			(7,550		)	11,445
NON-CURRENT ASSETS
Investments in subsidiaries	—			3,090			1,124			—			(4,214		)	—
Fixed assets, net	—			16			48			418			—			482
Goodwill	—			—			—			2,835			—			2,835
Other intangible assets, net	—			—			—			339			—			339
Investments in associates	—			160			—			36			—			196
Deferred tax assets	—			—			—			6			—			6
Pension benefits asset	—			—			—			316			—			316
Other non-current assets	3			9			6			191			—			209
Non-current amounts due from group undertakings	—			518			703			—			(1,221		)	—
Total non-current assets	3			3,793			1,881			4,141			(5,435		)	4,383
TOTAL ASSETS	$	3,997		$	4,733		$	3,073		$	17,010		$	(12,985	)	$	15,828
LIABILITIES AND STOCKHOLDERS’ EQUITY
CURRENT LIABILITIES
Fiduciary liabilities	$	—		$	—		$	—		$	9,306		$	—		$	9,306
Deferred revenue and accrued expenses	2			—			14			355			—			371
Income taxes payable	—			—			—			86			(33		)	53
Short-term debt and current portion of long-term debt	—			15			—			—			—			15
Deferred tax liabilities	—			—			—			36			—			36
Other current liabilities	56			8			18			413			—			495
Amounts due to group undertakings	—			4,768			1,621			1,128			(7,517		)	—
Total current liabilities	58			4,791			1,653			11,324			(7,550		)	10,276
NON-CURRENT LIABILITIES
Investments in subsidiaries	702			—			—			—			(702		)	—
Long-term debt	795			778			733			1			—			2,307
Liabilities for pension benefits	—			—			—			130			—			130
Deferred tax liabilities	—			1			—			77			—			78
Provisions for liabilities	—			—			3			208			—			211
Other non-current liabilities	—			—			41			313			—			354
Non-current amounts due to group undertakings	—			—			518			703			(1,221		)	—
Total non-current liabilities	1,497			779			1,295			1,432			(1,923		)	3,080
TOTAL LIABILITIES	$	1,555		$	5,570		$	2,948		$	12,756		$	(9,473	)	$	13,356
Condensed Consolidating Balance Sheet (continued)
	As of March 31, 2014
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
EQUITY
Total Willis Group Holdings stockholders’ equity	2,442			(837		)	125			4,224			(3,512		)	2,442
Noncontrolling interests	—			—			—			30			—			30
Total equity	2,442			(837		)	125			4,254			(3,512		)	2,472
TOTAL LIABILITIES AND EQUITY	$	3,997		$	4,733		$	3,073		$	17,010		$	(12,985	)	$	15,828
Condensed Consolidating Balance Sheet
	As of December 31, 2013
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
ASSETS
CURRENT ASSETS
Cash and cash equivalents	$	3		$	3		$	—		$	790		$	—		$	796
Accounts receivable, net	—			—			4			1,037			—			1,041
Fiduciary assets	—			—			—			8,412			—			8,412
Deferred tax assets	—			—			—			16			(1		)	15
Other current assets	1			21			10			186			(21		)	197
Amounts due from group undertakings	4,051			903			1,317			1,484			(7,755		)	—
Total current assets	4,055			927			1,331			11,925			(7,777		)	10,461
NON-CURRENT ASSETS
Investments in subsidiaries	—			2,838			1,021			—			(3,859		)	—
Fixed assets, net	—			15			51			415			—			481
Goodwill	—			—			—			2,838			—			2,838
Other intangible assets, net	—			—			—			353			—			353
Investments in associates	—			156			—			20			—			176
Deferred tax assets	—			—			—			7			—			7
Pension benefits asset	—			—			—			278			—			278
Other non-current assets	4			9			5			188			—			206
Non-current amounts due from group undertakings	—			518			690			—			(1,208		)	—
Total non-current assets	4			3,536			1,767			4,099			(5,067		)	4,339
TOTAL ASSETS	$	4,059		$	4,463		$	3,098		$	16,024		$	(12,844	)	$	14,800
LIABILITIES AND STOCKHOLDERS’ EQUITY
CURRENT LIABILITIES
Fiduciary liabilities	$	—		$	—		$	—		$	8,412		$	—		$	8,412
Deferred revenue and accrued expenses	2			1			28			555			—			586
Income taxes payable	—			3			—			39			(21		)	21
Short-term debt and current portion of long-term debt	—			15			—			—			—			15
Deferred tax liabilities	—			—			—			25			—			25
Other current liabilities	62			15			38			300			—			415
Amounts due to Group undertakings	—			4,760			1,662			1,333			(7,755		)	—
Total current liabilities	64			4,794			1,728			10,664			(7,776		)	9,474
NON-CURRENT LIABILITIES
Investments in subsidiaries	985			—			—			—			(985		)	—
Long-term debt	795			782			733			1			—			2,311
Liabilities for pension benefits	—			—			—			136			—			136
Deferred tax liabilities	—			1			—			55			—			56
Provisions for liabilities	—			—			—			206			—			206
Other non-current liabilities	—			—			48			326			—			374
Non-current amounts due to Group undertakings	—			—			518			690			(1,208		)	—
Total non-current liabilities	1,780			783			1,299			1,414			(2,193		)	3,083
TOTAL LIABILITIES	$	1,844		$	5,577		$	3,027		$	12,078		$	(9,969	)	$	12,557
Condensed Consolidating Balance Sheet (continued)
	As of December 31, 2013
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
EQUITY
Total Willis Group Holdings stockholders’ equity	2,215			(1,114		)	71			3,918			(2,875		)	2,215
Noncontrolling interests	—			—			—			28			—			28
Total equity	2,215			(1,114		)	71			3,946			(2,875		)	2,243
TOTAL LIABILITIES AND EQUITY	$	4,059		$	4,463		$	3,098		$	16,024		$	(12,844	)	$	14,800
Condensed Consolidating Statement of Cash Flows
	Three months ended March 31, 2014
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	$	(23	)	$	25		$	(21	)	$	25		$	(1	)	$	5
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds on disposal of fixed and intangible assets	—			—			1			1			(1		)	1
Additions to fixed assets	—			(2		)	(2		)	(19		)	1			(22		)
Additions to intangible assets	—			—			—			(1		)	—			(1		)
Payments to acquire other investments	—			—			—			(4		)	—			(4		)
Proceeds from sales of operations, net of cash disposed	—			—			—			5			—			5
Proceeds from intercompany investing activities	65			12			120			115			(312		)	—
Repayments of intercompany investing activities	—			—			—			(16		)	16			—
Net cash provided by investing activities	65			10			119			81			(296		)	(21		)
CASH FLOWS FROM FINANCING ACTIVITIES
Debt issuance costs	—			—			—			(2		)	—			(2		)
Repayments of debt	—			(4		)	—			—			—			(4		)
Repurchase of shares	(35		)	—			—			—			—			(35		)
Proceeds from issue of shares	43			—			—			—			—			43
Excess tax benefits from share-based payment arrangements	—			—			—			1			—			1
Dividends paid	(50		)	—			—			(1		)	1			(50		)
Dividends paid to noncontrolling interests	—			—			—			(2		)	—			(2		)
Proceeds from intercompany financing activities	—			16			—			—			(16		)	—
Repayments of intercompany financing activities	—			(47		)	(98		)	(167		)	312			—
Net cash used in financing activities	(42		)	(35		)	(98		)	(171		)	297			(49		)
DECREASE IN CASH AND CASH EQUIVALENTS	—			—			—			(65		)	—			(65		)
Effect of exchange rate changes on cash and cash equivalents	—			—			—			3			—			3
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	3			3			—			790			—			796
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	3		$	3		$	—		$	728		$	—		$	734
Condensed Consolidating Statement of Cash Flows
	Three months ended March 31, 2013
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	$	(23	)	$	(144	)	$	(102	)	$	308		$	—		$	39
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds on disposal of fixed and intangible assets	—			—			2			2			—			4
Additions to fixed assets	—			(1		)	—			(22		)	—			(23		)
Acquisitions of subsidiaries, net of cash acquired	—			—			—			(1		)	—			(1		)
Payments to acquire other investments	—			—			—			(1		)	—			(1		)
Proceeds from intercompany investing activities	180			148			10			—			(338		)	—
Repayments of intercompany investing activities	(129		)	—			—			(235		)	364			—
Net cash provided by (used in) investing activities	51			147			12			(257		)	26			(21		)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from draw down of revolving credit facility	—			55			—			—			—			55
Repayments of debt	—			(4		)	—			—			—			(4		)
Proceeds from issue of shares	19			—			—			—			—			19
Dividends paid	(47		)	—			—			—			—			(47		)
Acquisition of noncontrolling interests	—			—			—			(4		)	—			(4		)
Dividends paid to noncontrolling interests	—			—			—			(1		)	—			(1		)
Proceeds from intercompany financing activities	—			128			107			129			(364		)	—
Repayments of intercompany financing activities	—			(180		)	(17		)	(141		)	338			—
Net cash (used in) provided by financing activities	(28		)	(1		)	90			(17		)	(26		)	18
INCREASE IN CASH AND CASH EQUIVALENTS	—			2			—			34			—			36
Effect of exchange rate changes on cash and cash equivalents	—			—			—			(5		)	—			(5		)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	1			—			—			499			—			500
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	1		$	2		$	—		$	528		$	—		$	531
FINANCIAL INFORMATION FOR ISSUER, PARENT GUARANTOR, OTHER GUARANTOR SUBSIDIARIES AND NON-GUARANTOR SUBSIDIARIES
Trinity Acquisition plc has $525 million senior notes outstanding that were issued on August 15, 2013.
All direct obligations under the senior notes were jointly and severally, irrevocably and fully and unconditionally guaranteed by Willis Netherlands Holdings B.V, Willis Investment UK Holdings Limited, TA I Limited, Willis Group Limited and Willis North America, Inc, collectively the 'Other Guarantors', and with Willis Group Holdings, the 'Guarantor Companies'.
The guarantor structure described above differs from the guarantor structure associated with the senior notes issued by the Company and Willis North America (the ‘Willis North America Debt Securities’) in that Trinity Acquisition plc is the issuer and not a subsidiary guarantor, and Willis North America, Inc. is a subsidiary guarantor.
Presented below is condensed consolidating financial information for:
(i)	Willis Group Holdings, which is a guarantor, on a parent company only basis;
(ii)	the Other Guarantors, which are all 100 percent directly or indirectly owned subsidiaries of the parent. Willis Netherlands B.V, Willis Investment UK Holdings Limited and TA 1 Limited are all direct or indirect parents of the issuer and Willis Group Limited and Willis North America, Inc, are 100 percent direct or indirectly owned subsidiaries or the issuer;
(iii)	Trinity Acquisition plc, which is the issuer and is a 100 percent indirectly owned subsidiary of the parent;
(iv)	Other, which are the non-guarantor subsidiaries, on a combined basis;
(v)	Consolidating adjustments; and
(vi)	the Consolidated Company.
The equity method has been used for investments in subsidiaries in the condensed consolidating balance sheets as of March 31, 2014 of Willis Group Holdings, the Other Guarantors and the Issuer.
The entities included in the Other Guarantors column as of March 31, 2014 are Willis Netherlands Holdings B.V., Willis Investment UK Holdings Limited, Willis North America, TA I Limited and Willis Group Limited.
Restatement to 2013 financial information
Regulation S-X, Article 3, Rule 3-10, allows for the presentation of condensed consolidating financial information. In accordance with these rules, the condensed consolidating financial information should be presented in accordance with US GAAP, except that (i) the guarantor and non-guarantor information is presented on a combined rather than consolidated basis, which requires the elimination of intra-entity activity and (ii) investments in subsidiaries are required to be presented under the equity method of accounting. Subsequent to the issuance of our financial statements for the first quarter 2013, management determined that certain balances were not presented in accordance with the above principles and have therefore restated our condensed consolidating financial information to reflect (i) gross, rather than net, presentation of intercompany balance sheet positions, (ii) dividends received from subsidiaries as reductions to the equity method investment balances as opposed to component of investment income from group undertakings, and (iii) appropriate push down accounting for goodwill.
The impacts of these changes on the previously reported 2013 financial statements are shown in the tables below.
	As previously reported			Reclassifications			As Reclassified
	(millions)
Condensed consolidating statement of operations for the three months ended 31 March 2013
Willis Group Holdings
Operating (loss) income	$	(4	)	$	3		$	(1	)
Net income attributable to Willis Group Holdings	219			—			219
The Other Guarantors
Operating loss	$	(72	)	$	(5	)	$	(77	)
Net income (loss) attributable to Willis Group Holdings	236			(1		)	235
The Issuer
Operating income	$	—		$	—		$	—
Net income (loss) attributable to Willis Group Holdings	223			(1		)	222
Other
Operating income	$	178		$	181		$	359
Net income attributable to Willis Group Holdings	98			140			238
Consolidating adjustments
Operating income (loss)	$	185		$	(185	)	$	—
Net loss attributable to Willis Group Holdings	(557		)	(138		)	(695		)
	As previously reported			Reclassifications			As Reclassified
	(millions)
Condensed consolidating statement of comprehensive income for the three months ended 31 March 2013
Willis Group Holdings
Comprehensive income attributable to Willis Group Holdings	$	183		$	—		$	183
The Other Guarantors
Comprehensive income (loss) attributable to Willis Group Holdings	$	200		$	(1	)	$	199
The Issuer
Comprehensive income (loss) attributable to Willis Group Holdings	$	192		$	(1	)	$	191
Other
Comprehensive income attributable to Willis Group Holdings	$	60		$	140		$	200
Consolidating adjustments
Comprehensive loss attributable to Willis Group Holdings	$	(452	)	$	(138	)	$	(590	)
	As previously reported			Reclassifications			As Reclassified
	(millions)
Condensed consolidating statement of cash flows for the three months ended 31 March 2013
Willis Group Holdings
Net cash (used in) provided by operating activities	$	(25	)	$	2		$	(23	)
Net cash provided by investing activities	—			51			51
Net cash provided by (used in) financing activities	25			(53		)	(28		)
The Other Guarantors
Net cash provided by (used in) operating activities	$	587		$	(120	)	$	467
Net cash provided by (used in) investing activities	1			(504		)	(503		)
Net cash (used in) provided by financing activities	(586		)	624			38
The Issuer
Net cash provided by (used in) operating activities	$	5		$	(161	)	$	(156	)
Net cash provided by investing activities	—			148			148
Net cash (used in) provided by financing activities	(5		)	13			8
Other
Net cash provided by (used in) operating activities	$	29		$	279		$	308
Net cash used in investing activities	(22		)	(235		)	(257		)
Net cash provided by (used in) financing activities	27			(44		)	(17		)
Consolidating adjustments
Net cash used in operating activities	$	(557	)	$	—		$	(557	)
Net cash provided by investing activities	—			540			540
Net cash provided by (used in) financing activities	557			(540		)	17
Condensed Consolidating Statement of Operations
	Three months ended March 31, 2014
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
REVENUES
Commissions and fees	$	—		$	2		$	—		$	1,088		$	—		$	1,090
Investment income	—			—			—			4			—			4
Other income	—			—			—			3			—			3
Total revenues	—			2			—			1,095			—			1,097
EXPENSES
Salaries and benefits	—			(19		)	—			(551		)	—			(570		)
Other operating expenses	(4		)	(41		)	—			(120		)	—			(165		)
Depreciation expense	—			(5		)	—			(18		)	—			(23		)
Amortization of intangible assets	—			—			—			(13		)	—			(13		)
Total expenses	(4		)	(65		)	—			(702		)	—			(771		)
OPERATING (LOSS) INCOME	(4		)	(63		)	—			393			—			326
Other income (expense)	—			1			—			(1		)	—			—
Income from group undertakings	—			82			22			27			(131		)	—
Expenses due to group undertakings	—			(49		)	(7		)	(75		)	131			—
Interest expense	(11		)	(11		)	(9		)	(1		)	—			(32		)
(LOSS) INCOME BEFORE INCOME TAXES AND INTEREST IN EARNINGS OF ASSOCIATES	(15		)	(40		)	6			343			—			294
Income taxes	—			25			(1		)	(87		)	—			(63		)
(LOSS) INCOME BEFORE INTEREST IN EARNINGS OF ASSOCIATES	(15		)	(15		)	5			256			—			231
Interest in earnings of associates, net of tax	—			3			—			16			—			19
Equity account for subsidiaries	261			268			215			—			(744		)	—
NET INCOME	246			256			220			272			(744		)	250
Less: Net income attributable to noncontrolling interests	—			—			—			(4		)	—			(4		)
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	246		$	256		$	220		$	268		$	(744	)	$	246
Condensed Consolidating Statement of Comprehensive Income
	Three months ended March 31, 2014
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
Comprehensive income	$	254		$	264		$	228		$	281		$	(769	)	$	258
Less: comprehensive income attributable to noncontrolling interests	—			—			—			(4		)	—			(4		)
TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	254		$	264		$	228		$	277		$	(769	)	$	254
Condensed Consolidating Statement of Operations
	Three months ended March 31, 2013
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
REVENUES
Commissions and fees	$	—		$	—		$	—		$	1,046		$	—		$	1,046
Investment income	—			—			—			4			—			4
Other income	—			—			—			1			—			1
Total revenues	—			—			—			1,051			—			1,051
EXPENSES
Salaries and benefits	—			(23		)	—			(545		)	—			(568		)
Other operating expenses	(1		)	(50		)	—			(111		)	—			(162		)
Depreciation expense	—			(4		)	—			(22		)	—			(26		)
Amortization of intangible assets	—			—			—			(14		)	—			(14		)
Total expenses	(1		)	(77		)	—			(692		)	—			(770		)
OPERATING (LOSS) INCOME	(1		)	(77		)	—			359			—			281
Other (expense) income	(3		)	1			—			8			—			6
Income from group undertakings	—			114			13			21			(148		)	—
Expenses due to group undertakings	—			(34		)	(6		)	(108		)	148			—
Interest expense	(11		)	(17		)	(2		)	(1		)	—			(31		)
(LOSS) INCOME BEFORE INCOME TAXES AND INTEREST IN EARNINGS OF ASSOCIATES	(15		)	(13		)	5			279			—			256
Income taxes	—			2			—			(50		)	—			(48		)
(LOSS) INCOME BEFORE INTEREST IN EARNINGS OF ASSOCIATES	(15		)	(11		)	5			229			—			208
Interest in earnings of associates, net of tax	—			2			—			13			—			15
Equity account for subsidiaries	234			244			217			—			(695		)	—
NET INCOME	219			235			222			242			(695		)	223
Less: Net income attributable to noncontrolling interests	—			—			—			(4		)	—			(4		)
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	219		$	235		$	222		$	238		$	(695	)	$	219
Condensed Consolidating Statement of Comprehensive Income
	Three months ended March 31, 2013
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
Comprehensive income	$	183		$	199		$	191		$	203		$	(590	)	$	186
Less: comprehensive income attributable to noncontrolling interests	—			—			—			(3		)	—			(3		)
TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	183		$	199		$	191		$	200		$	(590	)	$	183
Condensed Consolidating Balance Sheet
	As of March 31, 2014
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
ASSETS
CURRENT ASSETS
Cash and cash equivalents	$	3		$	3		$	—		$	728		$	—		$	734
Accounts receivable, net	1			4			—			1,180			—			1,185
Fiduciary assets	—			—			—			9,306			—			9,306
Deferred tax assets	—			—			—			16			—			16
Other current assets	1			59			1			183			(40		)	204
Amounts due from group undertakings	3,989			813			803			1,456			(7,061		)	—
Total current assets	3,994			879			804			12,869			(7,101		)	11,445
NON-CURRENT ASSETS
Investments in subsidiaries	—			4,024			2,940			—			(6,964		)	—
Fixed assets, net	—			64			—			418			—			482
Goodwill	—			—			—			2,835			—			2,835
Other intangible assets, net	—			—			—			339			—			339
Investments in associates	—			160			—			36			—			196
Deferred tax assets	—			—			—			6			—			6
Pension benefits asset	—			—			—			316			—			316
Other non-current assets	3			6			9			191			—			209
Non-current amounts due from group undertakings	—			1,132			518			—			(1,650		)	—
Total non-current assets	3			5,386			3,467			4,141			(8,614		)	4,383
TOTAL ASSETS	$	3,997		$	6,265		$	4,271		$	17,010		$	(15,715	)	$	15,828
LIABILITIES AND STOCKHOLDERS’ EQUITY
CURRENT LIABILITIES
Fiduciary liabilities	$	—		$	—		$	—		$	9,306		$	—		$	9,306
Deferred revenue and accrued expenses	2			14			—			355			—			371
Income taxes payable	—			—			7			86			(40		)	53
Short-term debt and current portion of long-term debt	—			—			15			—			—			15
Deferred tax liabilities	—			—			—			36			—			36
Other current liabilities	56			23			3			413			—			495
Amounts due to group undertakings	—			5,768			165			1,128			(7,061		)	—
Total current liabilities	58			5,805			190			11,324			(7,101		)	10,276
NON-CURRENT LIABILITIES
Investments in subsidiaries	702			—			—			—			(702		)	—
Long-term debt	795			733			778			1			—			2,307
Liabilities for pension benefits	—			—			—			130			—			130
Deferred tax liabilities	—			1			—			77			—			78
Provisions for liabilities	—			3			—			208			—			211
Other non-current liabilities	—			41			—			313			—			354
Non-current amounts due to group undertakings	—			519			428			703			(1,650		)	—
Total non-current liabilities	1,497			1,297			1,206			1,432			(2,352		)	3,080
TOTAL LIABILITIES	$	1,555		$	7,102		$	1,396		$	12,756		$	(9,453	)	$	13,356
Condensed Consolidating Balance Sheet (continued)
	As of March 31, 2014
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
EQUITY
Total Willis Group Holdings stockholders’ equity	2,442			(837		)	2,875			4,224			(6,262		)	2,442
Noncontrolling interests	—			—			—			30			—			30
Total equity	2,442			(837		)	2,875			4,254			(6,262		)	2,472
TOTAL LIABILITIES AND EQUITY	$	3,997		$	6,265		$	4,271		$	17,010		$	(15,715	)	$	15,828
Condensed Consolidating Balance Sheet
	As of December 31, 2013
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
ASSETS
CURRENT ASSETS
Cash and cash equivalents	$	3		$	3		$	—		$	790		$	—		$	796
Accounts receivable, net	—			4			—			1,037			—			1,041
Fiduciary assets	—			—			—			8,412			—			8,412
Deferred tax assets	—			—			—			16			(1		)	15
Other current assets	1			36			1			186			(27		)	197
Amounts due from group undertakings	4,051			975			793			1,484			(7,303		)	—
Total current assets	4,055			1,018			794			11,925			(7,331		)	10,461
NON-CURRENT ASSETS
Investments in subsidiaries	—			3,716			2,705			—			(6,421		)	—
Fixed assets, net	—			66			—			415			—			481
Goodwill	—			—			—			2,838			—			2,838
Other intangible assets, net	—			—			—			353			—			353
Investments in associates	—			156			—			20			—			176
Deferred tax assets	—			—			—			7			—			7
Pension benefits asset	—			—			—			278			—			278
Other non-current assets	4			5			9			188			—			206
Non-current amounts due from group undertakings	—			1,113			518			—			(1,631		)	—
Total non-current assets	4			5,056			3,232			4,099			(8,052		)	4,339
TOTAL ASSETS	$	4,059		$	6,074		$	4,026		$	16,024		$	(15,383	)	$	14,800
LIABILITIES AND STOCKHOLDERS’ EQUITY
CURRENT LIABILITIES
Fiduciary liabilities	$	—		$	—		$	—		$	8,412		$	—		$	8,412
Deferred revenue and accrued expenses	2			29			—			555			—			586
Income taxes payable	—			4			5			39			(27		)	21
Short-term debt and current portion of long-term debt	—			—			15			—			—			15
Deferred tax liabilities	—			—			—			25			—			25
Other current liabilities	62			42			11			300			—			415
Amounts due to group undertakings	—			5,813			157			1,333			(7,303		)	—
Total current liabilities	64			5,888			188			10,664			(7,330		)	9,474
NON-CURRENT LIABILITIES
Investments in subsidiaries	985			—			—			—			(985		)	—
Long-term debt	795			733			782			1			—			2,311
Liabilities for pension benefits	—			—			—			136			—			136
Deferred tax liabilities	—			1			—			55			—			56
Provisions for liabilities	—			—			—			206			—			206
Other non-current liabilities	—			48			—			326			—			374
Non-current amounts due to group undertakings	—			518			423			690			(1,631		)	—
Total non-current liabilities	1,780			1,300			1,205			1,414			(2,616		)	3,083
TOTAL LIABILITIES	$	1,844		$	7,188		$	1,393		$	12,078		$	(9,946	)	$	12,557
	As of December 31, 2013
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
EQUITY
Total Willis Group Holdings stockholders’ equity	2,215			(1,114		)	2,633			3,918			(5,437		)	2,215
Noncontrolling interests	—			—			—			28			—			28
Total equity	2,215			(1,114		)	2,633			3,946			(5,437		)	2,243
TOTAL LIABILITIES AND EQUITY	$	4,059		$	6,074		$	4,026		$	16,024		$	(15,383	)	$	14,800
Condensed Consolidating Statement of Cash Flows
	Three months ended March 31, 2014
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	$	(23	)	$	28		$	(24	)	$	25		$	(1	)	$	5
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds on disposal of fixed and intangible assets	—			1			—			1			(1		)	1
Additions to fixed assets	—			(4		)	—			(19		)	1			(22		)
Additions to intangible assets	—			—			—			(1		)	—			(1		)
Payments to acquire other investments	—			—			—			(4		)	—			(4		)
Proceeds from disposal of operations, net of cash disposed	—			—			—			5			—			5
Proceeds from intercompany investing activities	65			120			12			115			(312		)	—
Repayments of intercompany investing activities	—			—			—			(16		)	16			—
Net cash provided by investing activities	65			117			12			81			(296		)	(21		)
CASH FLOWS FROM FINANCING ACTIVITIES
Debt issuance costs	—			—			—			(2		)	—			(2		)
Repayments of debt	—			—			(4		)	—			—			(4		)
Repurchase of shares	(35		)	—			—			—			—			(35		)
Proceeds from issue of shares	43			—			—			—			—			43
Excess tax benefits from share-based payment arrangements	—			—			—			1			—			1
Dividends paid	(50		)	—			—			(1		)	1			(50		)
Dividends paid to noncontrolling interests	—			—			—			(2		)	—			(2		)
Proceeds from intercompany financing activities	—			—			16			—			(16		)	—
Repayments of intercompany financing activities	—			(145		)	—			(167		)	312			—
Net cash (used in) provided by financing activities	(42		)	(145		)	12			(171		)	297			(49		)
DECREASE IN CASH AND CASH EQUIVALENTS	—			—			—			(65		)	—			(65		)
Effect of exchange rate changes on cash and cash equivalents	—			—			—			3			—			3
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	3			3			—			790			—			796
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	3		$	3		$	—		$	728		$	—		$	734
Condensed Consolidating Statement of Cash Flows
	Three months ended March 31, 2013
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	$	(23	)	$	467		$	(156	)	$	308		$	(557	)	$	39
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds on disposal of fixed and intangible assets	—			2			—			2			—			4
Additions to fixed assets	—			(1		)	—			(22		)	—			(23		)
Acquisitions of subsidiaries, net of cash acquired	—			—			—			(1		)	—			(1		)
Payments to acquire other investments	—			—			—			(1		)	—			(1		)
Proceeds from intercompany investing activities	180			53			148			—			(381		)	—
Repayments of intercompany investing activities	(129		)	(557		)	—			(235		)	921			—
Net cash provided by (used in) investing activities	51			(503		)	148			(257		)	540			(21		)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from draw down of revolving credit facility	—			—			55			—			—			55
Repayments of debt	—			—			(4		)	—			—			(4		)
Proceeds from issue of shares	19			—			—			—			—			19
Dividends paid	(47		)	—			(557		)	—			557			(47		)
Acquisition of noncontrolling interests	—			—			—			(4		)	—			(4		)
Dividends paid to noncontrolling interests	—			—			—			(1		)	—			(1		)
Proceeds from intercompany financing activities	—			235			557			129			(921		)	—
Repayments of intercompany financing activities	—			(197		)	(43		)	(141		)	381			—
Net cash (used in) provided by financing activities	(28		)	38			8			(17		)	17			18
INCREASE IN CASH AND CASH EQUIVALENTS	—			2			—			34			—			36
Effect of exchange rate changes on cash and cash equivalents	—			—			—			(5		)	—			(5		)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	1			—			—			499			—			500
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	1		$	2		$	—		$	528		$	—		$	531

OTHER_INCOME_EXPENSE_NET_Table

OTHER INCOME (EXPENSE), NET (Tables)	3 Months Ended
	Mar. 31, 2014
Other Income Expense [Abstract]	'
Other income expense [Table Text Block]	'
	Other income (expense) consists of the following:
		Three months ended March 31,
		2014			2013
		(millions)
	Loss on disposal of operations	$	(3	)	$	—
	Foreign exchange gain	3			6
	Other income (expense)	$	—		$	6

INCOME_TAXES_Tables

INCOME TAXES (Tables)	3 Months Ended
	Mar. 31, 2014
Income Tax Disclosure [Abstract]	'
Components of Tax Charge	'
	The tables below reflect the components of the three months ended March 31, 2014 and 2013 tax charge:
		Income			Tax			Effective tax
		before tax						rate
		(millions, except percentages)
	Three months ended March 31, 2014
	Non-US ordinary income taxed at estimated annual effective tax rate	$	232		$	(50	)	22	%
	US ordinary income and tax charge	65			(12		)	18	%
	Items where tax effect is treated discretely:
	Loss on disposal of operations	(3		)	1			33	%
	Net adjustment in respect of prior periods	—			(2		)	—	%
	As reported	$	294		$	(63	)	21	%
	Three months ended March 31, 2013
	Non-US ordinary income taxed at estimated annual effective tax rate	$	218		$	(45	)	21	%
	US ordinary income and tax charge	$	38		$	(3	)	8	%
	As reported	$	256		$	(48	)	19	%

EARNINGS_PER_SHARE_Tables

EARNINGS PER SHARE (Tables)	3 Months Ended
	Mar. 31, 2014
Earnings Per Share [Abstract]	'
Basic and Diluted Earnings Per Share	'
	Basic and diluted earnings per share are as follows:
		Three months ended March 31,
		2014			2013
		(millions, except per share data)
	Net income attributable to Willis Group Holdings	$	246		$	219
	Basic average number of shares outstanding	179			173
	Dilutive effect of potentially issuable shares	3			3
	Diluted average number of shares outstanding	182			176
	Basic earnings per share:
	Net income attributable to Willis Group Holdings shareholders	$	1.37		$	1.27
	Dilutive effect of potentially issuable shares	(0.02		)	(0.03		)
	Diluted earnings per share:
	Net income attributable to Willis Group Holdings shareholders	$	1.35		$	1.24

PENSION_PLANS_Tables

PENSION PLANS (Tables)	3 Months Ended
	Mar. 31, 2014
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]	'
Components of Net Periodic Benefit (Income) Cost	'
	The components of the net periodic benefit (income) cost of the UK, US and other defined benefit plans are as follows:
		Three months ended March 31,
		UK Pension						US Pension						Other Pension Benefits
		Benefits						Benefits
		2014			2013			2014			2013			2014			2013
		(millions)
	Components of net periodic benefit (income) cost:
	Service cost	$	11		$	9		$	—		$	—		$	—		$	1
	Interest cost	30			27			10			10			2			1
	Expected return on plan assets	(54		)	(47		)	(13		)	(13		)	(1		)	(1		)
	Amortization of unrecognized prior service gain	(1		)	(1		)	—			—			—			—
	Amortization of unrecognized actuarial loss	11			11			1			2			—			—
	Net periodic benefit (income) cost	$	(3	)	$	(1	)	$	(2	)	$	(1	)	$	1		$	1

DERIVATIVE_FINANCIAL_INSTRUMEN1

DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Tables)	3 Months Ended
	Mar. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Summary of Contractual Amounts of Company's Forward Contracts by Major Currency	'
	The table below summarizes by major currency the contractual amounts of the Company’s forward contracts to exchange foreign currencies for Pounds sterling in the case of US dollars and US dollars for Euro and Japanese yen. Foreign currency notional amounts are reported in US dollars translated at contracted exchange rates.
		Sell				Fair value
		(millions)
	US dollar	$	447			$	20
	Euro	155				(2		)
	Japanese yen	45				4
Fair Value of Company's Derivative Financial Instruments and their Balance Sheet Classification	'
	The table below presents the fair value of the Company’s derivative financial instruments and their balance sheet classification at March 31, 2014 and December 31, 2013:
					Fair value
	Derivative financial instruments designated as hedging instruments:		Balance sheet		March 31, 2014				31-Dec-13
			classification
					(millions)
	Assets:
	Forward exchange contracts		Other assets		$	24			$	23
	Total derivatives designated as hedging instruments				$	24			$	23
	Liabilities:
	Forward exchange contracts		Other liabilities		$	2			$	2
	Total derivatives designated as hedging instruments				$	2			$	2
Effects of Gains/(Losses) on Derivative Financial Instruments in Cash Flow Hedging Relationships on Consolidated Statements of Comprehensive Income and Consolidated Statements of Equity	'
	The table below presents the effects of derivative financial instruments in cash flow hedging relationships on the consolidated statements of operations and the consolidated statements of equity for the three months ended March 31, 2014 and 2013:
	Derivatives in cash flow		Amount of				Location of gain (loss)		Amount of			Location of gain (loss)		Amount of
	hedging relationships		gain (loss)				reclassified from		gain (loss)			recognized in income on derivative		gain (loss)
			recognized				accumulated OCI(i) into		reclassified			(ineffective hedges and ineffective		recognized
			in OCI(i)on derivative (effective				income (effective element)		from			element of effective hedges)		in income on derivative
			element)						accumulated					(ineffective
									OCI(i) into					hedges
									income					and
									(effective					ineffective
									element)					element of
														effective
														hedges)
			(millions)						(millions)					(millions)
	Three months ended March 31, 2014
	Interest rate swaps		$	—			Investment income		$	(2	)	Other operating expenses		$	—
	Forward exchange contracts		—				Other operating expenses		1			Interest expense		—
	Total		$	—					$	(1	)			$	—
	Three months ended March 31, 2013
	Interest rate swaps		$	—			Investment income		$	(1	)	Other operating expenses		$	—
	Forward exchange contracts		(13		)		Other operating expenses		(2		)	Interest expense		—
	Total		$	(13	)				$	(3	)			$	—
	____________________
	Amounts above shown gross of tax.
	(i) Other Comprehensive Income
Effects of Derivative Financial Instruments in Fair Value Hedging Relationships on Consolidated Statements of Comprehensive Income	'
	All components of each derivative’s gain or loss were included in the assessment of hedge effectiveness.
	The table below presents the effects of derivative financial instruments no longer in fair value hedging relationships on the consolidated statements of operations for the three months ended March 31, 2014 and 2013.
	Derivative no longer in fair value hedging relationships		Hedged item no longer in fair value hedging relationship		(Loss) gain				Amortization of prior loss recognized on hedged item			Net gain recognized in interest expense
					recognized
					for
					derivative
					(millions)
	Three months ended March 31, 2014
	Interest rate swaps		5.625% senior notes due 2015		$	—			$	—		$	—
	Three months ended March 31, 2013
	Interest rate swaps		5.625% senior notes due 2015		$	—			$	(2	)	$	2

FAIR_VALUE_MEASUREMENT_Tables

FAIR VALUE MEASUREMENT (Tables)	3 Months Ended
	Mar. 31, 2014
Fair Value Disclosures [Abstract]	'
Assets and Liabilities Measured at Fair Value on Recurring Basis	'
		31-Mar-14
		Quoted		Significant		Significant
		prices in		other		other
		active		observable		unobservable
		markets		inputs		inputs
		for
		identical
		assets
		Level 1		Level 2		Level 3		Total
		(millions)
	Assets at fair value:
	Cash and cash equivalents	$	734	$	—	$	—	$	734
	Fiduciary funds (included within Fiduciary assets)	1,953		—		—		1,953
	Derivative financial instruments	—		24		—		24
	Total assets	$	2,687	$	24	$	—	$	2,711
	Liabilities at fair value:
	Derivative financial instruments	—		2		—		2
	Total liabilities	$	—	$	2	$	—	$	2
		31-Dec-13
		Quoted		Significant		Significant
		prices in		other		other
		active		observable		unobservable
		markets		inputs		inputs
		for
		identical
		assets
		Level 1		Level 2		Level 3		Total
		(millions)
	Assets at fair value:
	Cash and cash equivalents	$	796	$	—	$	—	$	796
	Fiduciary funds (included within Fiduciary assets)	1,662		—		—		1,662
	Derivative financial instruments	—		23		—		23
	Total assets	$	2,458	$	23	$	—	$	2,481
	Liabilities at fair value:
	Derivative financial instruments	—		2		—		2
	Total liabilities	$	—	$	2	$	—	$	2
Summary of Estimated Fair Value of Company's Financial Instruments Held or Issued to Finance Company's Operations	'
	The estimated fair value of the Company’s financial instruments held or issued to finance the Company’s operations is summarized below. Certain estimates and judgments were required to develop the fair value amounts. The fair value amounts shown below are not necessarily indicative of the amounts that the Company would realize upon disposition nor do they indicate the Company’s intent or ability to dispose of the financial instrument.
		31-Mar-14				31-Dec-13
		Carrying		Fair		Carrying		Fair
		amount		value		amount		value
		(millions)
	Assets:
	Derivative financial instruments	$	24	$	24	$	23	$	23
	Liabilities:
	Short-term debt	$	15	$	15	$	15	$	15
	Long-term debt	2,307		2,467		2,311		2,444
	Derivative financial instruments	2		2		2		2

GOODWILL_Tables

GOODWILL (Tables)	3 Months Ended
	Mar. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Changes in Carrying Amount of Goodwill by Segment	'
	The changes in the carrying amount of goodwill by segment for the three months ended March 31, 2014 and the year ended December 31, 2013 are as follows:
		Global		North			International			Total
				America
		(millions)
	Balance at January 1, 2013
	Goodwill, gross	$	1,127	$	1,792		$	400		$	3,319
	Accumulated impairment losses	—		(492		)	—			(492		)
	Goodwill, net	$	1,127	$	1,300		$	400		$	2,827
	Purchase price allocation adjustments	—		(1		)	—			(1		)
	Goodwill acquired during the year	15		—			1			16
	Goodwill disposed of during the year	—		(14		)	—			(14		)
	Other movements (i)	—		(1		)	—			(1		)
	Foreign exchange	3		—			8			11
	Balance at December 31, 2013
	Goodwill, gross	$	1,145	$	1,776		$	409		$	3,330
	Accumulated impairment losses	—		(492		)	—			(492		)
	Goodwill, net	$	1,145	$	1,284		$	409		$	2,838
	Goodwill disposed of during the period	—		(4		)	—			(4		)
	Other movements (i) (ii)	88		(45		)	(43		)	—
	Foreign exchange	1		—			—			1
	Balance at March 31, 2014
	Goodwill, gross	$	1,234	$	1,727		$	366		$	3,327
	Accumulated impairment losses	—		(492		)	—			(492		)
	Goodwill, net	$	1,234	$	1,235		$	366		$	2,835
	________________________________
	(i)	North America — $nil (2013: $1 million) tax benefit arising on the exercise of fully vested HRH stock options which were issued as part of the acquisition of HRH in 2008.

OTHER_INTANGIBLE_ASSETS_NET_Ta

OTHER INTANGIBLE ASSETS, NET (Tables)	3 Months Ended
	Mar. 31, 2014
Intangible Assets, Net (Excluding Goodwill) [Abstract]	'
Major Classes of Amortizable Intangible Assets	'
	The major classes of amortizable intangible assets are as follows:
		31-Mar-14							31-Dec-13
		Gross		Accumulated			Net		Gross		Accumulated			Net
		carrying		amortization			carrying		carrying		amortization			carrying
		amount					amount		amount					amount
		(millions)
	Customer and Marketing Related:
	Client Relationships	$	669	$	(335	)	$	334	$	671	$	(326	)	$	345
	Client Lists	3		(1		)	2		3		(1		)	2
	Non-compete Agreements	4		(1		)	3		4		(1		)	3
	Trade Names	—		—			—		2		(1		)	1
	Total Customer and Marketing Related	676		(337		)	339		680		(329		)	351
	Contract based, Technology and Other	—		—			—		5		(3		)	2
	Total amortizable intangible assets	$	676	$	(337	)	$	339	$	685	$	(332	)	$	353
Estimated Aggregate Amortization of Intangible Assets for Each of Next Five Years	'
	The estimated aggregate amortization of intangible assets for each of the next five years ended December 31 is as follows:
		Remainder of 2014		2015			2016		2017		2018			Thereafter		Total
		(millions)
	Amortization of intangible assets	$	37	$	42		$	37	$	32	$	29		$	162	$	339

OTHER_ASSETS_Tables

OTHER ASSETS (Tables)	3 Months Ended
	Mar. 31, 2014
Other Assets [Abstract]	'
Analysis of Other Assets	'
	An analysis of other assets is as follows:
		March 31,		31-Dec-13
		2014
		(millions)
	Other current assets
	Prepayments and accrued income	$	77	$	73
	Retention incentives	18		12
	Income tax receivable	29		32
	Deferred compensation plan assets	26		26
	Other receivables	54		54
	Total other current assets	$	204	$	197
	Other non-current assets
	Deferred compensation plan assets	$	88	$	88
	Income taxes receivable	22		21
	Accounts receivable, net	24		28
	Other investments	22		19
	Other receivables	53		50
	Total other non-current assets	$	209	$	206
	Total other assets	$	413	$	403

OTHER_LIABILITIES_Tables

OTHER LIABILITIES (Tables)	3 Months Ended
	Mar. 31, 2014
Other Liabilities [Abstract]	'
Analysis of Other Liabilities	'
	An analysis of other liabilities is as follows:
		March 31,		31-Dec-13
		2014
		(millions)
	Other current liabilities
	Accounts payable	$	147	$	123
	Accrued dividends payable	55		51
	Other taxes payable	118		51
	Other payables	175		190
	Total other current liabilities	$	495	$	415
	Other non-current liabilities
	Incentives from lessors	$	184	$	183
	Deferred compensation plan liability	88		89
	Income taxes payable	22		40
	Other payables	60		62
	Total other non-current liabilities	$	354	$	374
	Total other liabilities	$	849	$	789

DEBT_Tables

DEBT (Tables)	3 Months Ended
	Mar. 31, 2014
Debt Disclosure [Abstract]	'
Short-Term Debt and Current Portion of Long-Term Debt	'
	Current portion of the long-term debt consists of the following:
		March 31,		31-Dec-13
		2014
		(millions)
	Current portion of 7-year term loan facility expires 2018	$	15	$	15
Long-Term Debt	'
	Long-term debt consists of the following:
		March 31,		31-Dec-13
		2014
		(millions)
	7-year term loan facility expires 2018	$	255	$	259
	5.625% senior notes due 2015	148		148
	Fair value adjustment on 5.625% senior notes due 2015	4		4
	4.125% senior notes due 2016	299		299
	6.200% senior notes due 2017	394		394
	7.000% senior notes due 2019	187		187
	5.750% senior notes due 2021	496		496
	4.625% senior notes due 2023	249		249
	6.125% senior notes due 2043	274		274
	3-year term loan facility expires 2015	1		1
		$	2,307	$	2,311

SUPPLEMENTAL_DISCLOSURES_OF_CA1

SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION (Tables)	3 Months Ended
	Mar. 31, 2014
Supplemental Cash Flow Information [Abstract]	'
Supplemental Disclosures Regarding Cash Flow Information and Non-Cash Flow Investing And Financing Activities	'
	Supplemental disclosures regarding cash flow information and non-cash investing and financing activities are as follows:
		Three months ended March 31,
		2014		2013
		(millions)
	Supplemental disclosures of cash flow information:
	Cash payments for income taxes, net	$	16	$	10
	Cash payments for interest	59		57
	Acquisitions:
	Fair value of assets acquired, net of cash acquired	$	—	$	3
	Less: Fair value of liabilities assumed	—		(3		)
	Net assets acquired, net of cash acquired	$	—	$	—

COMPREHENSIVE_INCOME_LOSS_Tabl

COMPREHENSIVE INCOME (LOSS) (Tables)	3 Months Ended
	Mar. 31, 2014
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]	'
Components of Comprehensive Income	'
	The components of comprehensive income (loss) are as follows:
		Three months ended March 31,
		2014												2013
		Before tax amount				Tax				Net of tax amount				Before tax amount				Tax			Net of tax amount
		(millions)
	Other comprehensive income:
	Foreign currency translation adjustments	$	3			$	—			$	3			$	(74	)		$	—		$	(74	)
	Pension funding adjustments:
	Foreign currency translation on pension funding adjustments	(5		)		2				(3		)		53				(13		)	40
	Amortization of unrecognized actuarial loss	12				(2		)		10				13				(3		)	10
	Amortization of unrecognized prior service gain	(1		)		—				(1		)		(1		)		—			(1		)
		6				—				6				65				(16		)	49
	Derivative instruments:
	Interest rate swap reclassification adjustment	(2		)		—				(2		)		(1		)		—			(1		)
	Gain on forward exchange contracts (effective element)	—				—				—				(13		)		3			(10		)
	Forward exchange contracts reclassification adjustment	1				—				1				(2		)		1			(1		)
		(1		)		—				(1		)		(16		)		4			(12		)
	Other comprehensive income (loss)	8				—				8				(25		)		(12		)	(37		)
	Less: Other comprehensive income attributable to noncontrolling interests	—				—				—				1				—			1
	Other comprehensive income (loss) attributable to Willis Group Holdings	$	8			$	—			$	8			$	(24	)		$	(12	)	$	(36	)
Components of Accumulated Other Comprehensive Loss, Net of Tax	'
	The components of accumulated other comprehensive loss, net of tax, are as follows:
			Net foreign currency translation adjustment				Pension funding adjustment				Net unrealized gain on derivative instruments				Total
			(millions)
	Balance at December 31, 2013		$	(14	)		$	(714	)		$	35			$	(693	)
	Other comprehensive income before reclassifications		3				(3		)		—				—
	Amounts reclassified from accumulated other comprehensive income		—				9				(1		)		8
	Net current-period other comprehensive income, net of tax and noncontrolling interests		3				6				(1		)		8
	Balance at March 31, 2014		$	(11	)		$	(708	)		$	34			$	(685	)
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]	'
	Amounts reclassified out of accumulated other comprehensive income into the statement of operations are as follows:
	Details about accumulated other comprehensive income components		Amount reclassified from accumulated other comprehensive income								Affected line item in the statement of operations
			Three months ended March 31,
			2014				2013
			(millions)
	Gains and losses on cash flow hedges (Note 9)
	Interest rate swaps		$	(2	)		$	(1	)		Investment income
	Foreign exchange contracts		1				(2		)		Other operating expenses
			(1		)		(3		)		Total before tax
	Tax		—				1
			$	(1	)		$	(2	)		Net of tax
	Amortization of defined benefit pension items (Note 7)
	Prior service gain		$	(1	)		$	(1	)		Salaries and benefits
	Net actuarial loss		12				13				Salaries and benefits
			11				12				Total before tax
	Tax		(2		)		(3		)
			$	9			$	9			Net of tax
	Total reclassifications for the period		$	8			$	7

EQUITY_AND_NONCONTROLLING_INTE1

EQUITY AND NONCONTROLLING INTERESTS (Tables)	3 Months Ended
	Mar. 31, 2014
Stockholders' Equity Note [Abstract]	'
Equity and Noncontrolling Interests	'
	The components of stockholders’ equity and noncontrolling interests are as follows:
		31-Mar-14									31-Mar-13
		Willis			Noncontrolling			Total			Willis			Noncontrolling			Total
		Group			interests			equity			Group			interests			equity
		Holdings									Holdings
		stockholders									stockholders
		(millions)
	Balance at beginning of period	$	2,215		$	28		$	2,243		$	1,699		$	26		$	1,725
	Comprehensive income:
	Net income	246			4			250			219			4			223
	Other comprehensive income, net of tax	8			—			8			(36		)	(1		)	(37		)
	Comprehensive income	254			4			258			183			3			186
	Dividends	(54		)	(2		)	(56		)	(47		)	(1		)	(48		)
	Additional paid-in capital	62			—			62			33			—			33
	Repurchase of shares (i)	(35		)	—			(35		)	—			—			—
	Purchase of subsidiary shares from noncontrolling interests	—			—			—			(3		)	—			(3		)
	Balance at end of period	$	2,442		$	30		$	2,472		$	1,865		$	28		$	1,893
	_________________________________
	(i)	Based on settlement date we repurchased 825,000 shares at an average price of $42.4 in the three months ended March 31, 2014
Effects of Changes in Ownership Interest in Subsidiaries	'
	The effects on equity of changes in Willis Group Holdings ownership interest in its subsidiaries are as follows:
		31-Mar-14			31-Mar-13
		(millions)
	Net income attributable to Willis Group Holdings	$	246		$	219
	Transfers from noncontrolling interest:
	Decrease in Willis Group Holdings paid-in capital for purchase of noncontrolling interests	—			(3		)
	Net transfers to noncontrolling interests	—			(3		)
	Change from net income attributable to Willis Group Holdings and transfers from noncontrolling interests	$	246		$	216

SEGMENT_INFORMATION_Tables

SEGMENT INFORMATION (Tables)	3 Months Ended
	Mar. 31, 2014
Segment Reporting [Abstract]	'
Information Regarding Company's Segments	'
	Selected information regarding the Company’s segments is as follows:
		Three months ended March 31, 2014
		Commissions			Investment			Other		Total		Depreciation		Operating
		and fees			income			income		revenues		and		income
												amortization
		(millions)
	Global	$	442		$	2		$	2	$	446	$	9	$	181
	North America	369			—			1		370		18		96
	International	279			2			—		281		5		84
	Total Segments	1,090			4			3		1,097		32		361
	Corporate and Other (i)	—			—			—		—		4		(35		)
	Total Consolidated	$	1,090		$	4		$	3	$	1,097	$	36	$	326
		Three months ended March 31, 2013
		Commissions			Investment			Other		Total		Depreciation		Operating
		and fees			income			income		revenues		and		income
												amortization
		(millions)
	Global	$	427		$	1		$	—	$	428	$	7	$	187
	North America	355			1			1		357		19		82
	International	264			2			—		266		6		78
	Total Segments	1,046			4			1		1,051		32		347
	Corporate and Other (i)	—			—			—		—		8		(66		)
	Total Consolidated	$	1,046		$	4		$	1	$	1,051	$	40	$	281
	_________________________________
	(i)	See the following table for an analysis of the ‘Corporate and Other’ line.
		Three months ended March 31,
		2014			2013
		(millions)
	Costs of the holding company	$	(2	)	$	(1	)
	Costs related to group functions, leadership and projects	(44		)	(26		)
	Significant legal and regulatory settlements managed centrally	(2		)	(3		)
	Non-servicing element of defined benefit pensions	13			10
	Expense reduction initiative (a)	—			(46		)
	Total Corporate and Other	$	(35	)	$	(66	)
	_________________________________
	(a)	Charge related to the assessment of the Company's organizational design.
Total Consolidated Operating Income	'
	The following table reconciles total consolidated operating income, as disclosed in the segment tables above, to consolidated income before income taxes and interest in earnings of associates:
		Three months ended March 31,
		2014			2013
		(millions)
	Total consolidated operating income	$	326		$	281
	Other income (expense)	—			6
	Interest expense	(32		)	(31		)
	Income before income taxes and interest in earnings of associates	$	294		$	256

FINANCIAL_INFORMATION_FOR_PARE2

FINANCIAL INFORMATION FOR PARENT GUARANTOR, OTHER GUARANTOR SUBSIDIARIES AND NON-GUARANTOR SUBSIDIARIES (Tables)	3 Months Ended
	Mar. 31, 2014																			Mar. 31, 2013
Condensed Financial Information of Parent Company Only Disclosure [Abstract]	'																			'
Condensed Consolidating Statement of Operations	'																			'
	Condensed Consolidating Statement of Operations																			Condensed Consolidating Statement of Operations
		Three months ended March 31, 2014																			Three months ended March 31, 2013
		Willis			The Other			The Issuer			Other			Consolidating			Consolidated				Willis			The Other			The Issuer			Other			Consolidating			Consolidated
		Group			Guarantors									adjustments							Group			Guarantors									adjustments
		Holdings																			Holdings
		(millions)																			(millions)
	REVENUES																			REVENUES
	Commissions and fees	$	—		$	—		$	2		$	1,088		$	—		$	1,090		Commissions and fees	$	—		$	—		$	—		$	1,046		$	—		$	1,046
	Investment income	—			—			—			4			—			4			Investment income	—			—			—			4			—			4
	Other income	—			—			—			3			—			3			Other income	—			—			—			1			—			1
	Total revenues	—			—			2			1,095			—			1,097			Total revenues	—			—			—			1,051			—			1,051
	EXPENSES																			EXPENSES
	Salaries and benefits	—			—			(19		)	(551		)	—			(570		)	Salaries and benefits	—			—			(23		)	(545		)	—			(568		)
	Other operating expenses	(4		)	(24		)	(17		)	(120		)	—			(165		)	Other operating expenses	(1		)	(6		)	(44		)	(111		)	—			(162		)
	Depreciation expense	—			(1		)	(4		)	(18		)	—			(23		)	Depreciation expense	—			—			(4		)	(22		)	—			(26		)
	Amortization of intangible assets	—			—			—			(13		)	—			(13		)	Amortization of intangible assets	—			—			—			(14		)	—			(14		)
	Total expenses	(4		)	(25		)	(40		)	(702		)	—			(771		)	Total expenses	(1		)	(6		)	(71		)	(692		)	—			(770		)
	OPERATING (LOSS) INCOME	(4		)	(25		)	(38		)	393			—			326			OPERATING (LOSS) INCOME	(1		)	(6		)	(71		)	359			—			281
	Other income (expense)	—			1			—			(1		)	—			—			Other (expense) income	(3		)	1			—			8			—			6
	Income from group undertakings	—			59			43			27			(129		)	—			Income from group undertakings	—			44			82			21			(147		)	—
	Expenses due to group undertakings	—			(8		)	(46		)	(75		)	129			—			Expenses due to group undertakings	—			(8		)	(31		)	(108		)	147			—
	Interest expense	(11		)	(9		)	(11		)	(1		)	—			(32		)	Interest expense	(11		)	(2		)	(17		)	(1		)	—			(31		)
	(LOSS) INCOME BEFORE INCOME TAXES AND INTEREST IN EARNINGS OF ASSOCIATES	(15		)	18			(52		)	343			—			294			(LOSS) INCOME BEFORE INCOME TAXES AND INTEREST IN EARNINGS OF ASSOCIATES	(15		)	29			(37		)	279			—			256
	Income taxes	—			5			19			(87		)	—			(63		)	Income taxes	—			2			—			(50		)	—			(48		)
	(LOSS) INCOME BEFORE INTEREST IN EARNINGS OF ASSOCIATES	(15		)	23			(33		)	256			—			231			(LOSS) INCOME BEFORE INTEREST IN EARNINGS OF ASSOCIATES	(15		)	31			(37		)	229			—			208
	Interest in earnings of associates, net of tax	—			3			—			16			—			19			Interest in earnings of associates, net of tax	—			2			—			13			—			15
	Equity account for subsidiaries	261			230			83			—			(574		)	—			Equity account for subsidiaries	234			202			73			—			(509		)	—
	NET INCOME	246			256			50			272			(574		)	250			NET INCOME	219			235			36			242			(509		)	223
	Less: Net income attributable to noncontrolling interests	—			—			—			(4		)	—			(4		)	Less: Net income attributable to noncontrolling interests	—			—			—			(4		)	—			(4		)
	NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	246		$	256		$	50		$	268		$	(574	)	$	246		NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	219		$	235		$	36		$	238		$	(509	)	$	219
Condensed Consolidating Statement of Comprehensive Income	'																			'
	Condensed Consolidating Statement of Comprehensive Income																			Condensed Consolidating Statement of Comprehensive Income
		Three months ended March 31, 2014																			Three months ended March 31, 2013
		Willis			The Other			The Issuer			Other			Consolidating			Consolidated				Willis			The Other			The Issuer			Other			Consolidating			Consolidated
		Group			Guarantors									adjustments							Group			Guarantors									adjustments
		Holdings																			Holdings
		(millions)																			(millions)
	Comprehensive income	$	254		$	264		$	51		$	281		$	(592	)	$	258		Comprehensive income	$	183		$	199		$	38		$	203		$	(437	)	$	186
	Less: comprehensive income attributable to noncontrolling interests	—			—			—			(4		)	—			(4		)	Less: comprehensive income attributable to noncontrolling interests	—			—			—			(3		)	—			(3		)
	TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	254		$	264		$	51		$	277		$	(592	)	$	254		TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	183		$	199		$	38		$	200		$	(437	)	$	183
Condensed Consolidating Balance Sheet	'																			'
	Condensed Consolidating Balance Sheet
		As of March 31, 2014
		Willis			The Other			The Issuer			Other			Consolidating			Consolidated
		Group			Guarantors									adjustments
		Holdings
		(millions)
	ASSETS
	CURRENT ASSETS
	Cash and cash equivalents	$	3		$	3		$	—		$	728		$	—		$	734
	Accounts receivable, net	1			—			4			1,180			—			1,185
	Fiduciary assets	—			—			—			9,306			—			9,306
	Deferred tax assets	—			—			—			16			—			16
	Other current assets	1			25			28			183			(33		)	204
	Amounts due from group undertakings	3,989			912			1,160			1,456			(7,517		)	—
	Total current assets	3,994			940			1,192			12,869			(7,550		)	11,445
	NON-CURRENT ASSETS
	Investments in subsidiaries	—			3,090			1,124			—			(4,214		)	—
	Fixed assets, net	—			16			48			418			—			482
	Goodwill	—			—			—			2,835			—			2,835
	Other intangible assets, net	—			—			—			339			—			339
	Investments in associates	—			160			—			36			—			196
	Deferred tax assets	—			—			—			6			—			6
	Pension benefits asset	—			—			—			316			—			316
	Other non-current assets	3			9			6			191			—			209
	Non-current amounts due from group undertakings	—			518			703			—			(1,221		)	—
	Total non-current assets	3			3,793			1,881			4,141			(5,435		)	4,383
	TOTAL ASSETS	$	3,997		$	4,733		$	3,073		$	17,010		$	(12,985	)	$	15,828
	LIABILITIES AND STOCKHOLDERS’ EQUITY
	CURRENT LIABILITIES
	Fiduciary liabilities	$	—		$	—		$	—		$	9,306		$	—		$	9,306
	Deferred revenue and accrued expenses	2			—			14			355			—			371
	Income taxes payable	—			—			—			86			(33		)	53
	Short-term debt and current portion of long-term debt	—			15			—			—			—			15
	Deferred tax liabilities	—			—			—			36			—			36
	Other current liabilities	56			8			18			413			—			495
	Amounts due to group undertakings	—			4,768			1,621			1,128			(7,517		)	—
	Total current liabilities	58			4,791			1,653			11,324			(7,550		)	10,276
	NON-CURRENT LIABILITIES
	Investments in subsidiaries	702			—			—			—			(702		)	—
	Long-term debt	795			778			733			1			—			2,307
	Liabilities for pension benefits	—			—			—			130			—			130
	Deferred tax liabilities	—			1			—			77			—			78
	Provisions for liabilities	—			—			3			208			—			211
	Other non-current liabilities	—			—			41			313			—			354
	Non-current amounts due to group undertakings	—			—			518			703			(1,221		)	—
	Total non-current liabilities	1,497			779			1,295			1,432			(1,923		)	3,080
	TOTAL LIABILITIES	$	1,555		$	5,570		$	2,948		$	12,756		$	(9,473	)	$	13,356
	Condensed Consolidating Balance Sheet (continued)
		As of March 31, 2014
		Willis			The Other			The Issuer			Other			Consolidating			Consolidated
		Group			Guarantors									adjustments
		Holdings
		(millions)
	EQUITY
	Total Willis Group Holdings stockholders’ equity	2,442			(837		)	125			4,224			(3,512		)	2,442
	Noncontrolling interests	—			—			—			30			—			30
	Total equity	2,442			(837		)	125			4,254			(3,512		)	2,472
	TOTAL LIABILITIES AND EQUITY	$	3,997		$	4,733		$	3,073		$	17,010		$	(12,985	)	$	15,828
	Condensed Consolidating Balance Sheet
		As of December 31, 2013
		Willis			The Other			The Issuer			Other			Consolidating			Consolidated
		Group			Guarantors									adjustments
		Holdings
	(millions)
ASSETS
CURRENT ASSETS
Cash and cash equivalents	$	3		$	3		$	—		$	790		$	—		$	796
Accounts receivable, net	—			—			4			1,037			—			1,041
Fiduciary assets	—			—			—			8,412			—			8,412
Deferred tax assets	—			—			—			16			(1		)	15
Other current assets	1			21			10			186			(21		)	197
Amounts due from group undertakings	4,051			903			1,317			1,484			(7,755		)	—
Total current assets	4,055			927			1,331			11,925			(7,777		)	10,461
NON-CURRENT ASSETS
Investments in subsidiaries	—			2,838			1,021			—			(3,859		)	—
Fixed assets, net	—			15			51			415			—			481
Goodwill	—			—			—			2,838			—			2,838
Other intangible assets, net	—			—			—			353			—			353
Investments in associates	—			156			—			20			—			176
Deferred tax assets	—			—			—			7			—			7
Pension benefits asset	—			—			—			278			—			278
Other non-current assets	4			9			5			188			—			206
Non-current amounts due from group undertakings	—			518			690			—			(1,208		)	—
Total non-current assets	4			3,536			1,767			4,099			(5,067		)	4,339
TOTAL ASSETS	$	4,059		$	4,463		$	3,098		$	16,024		$	(12,844	)	$	14,800
LIABILITIES AND STOCKHOLDERS’ EQUITY
CURRENT LIABILITIES
Fiduciary liabilities	$	—		$	—		$	—		$	8,412		$	—		$	8,412
Deferred revenue and accrued expenses	2			1			28			555			—			586
Income taxes payable	—			3			—			39			(21		)	21
Short-term debt and current portion of long-term debt	—			15			—			—			—			15
Deferred tax liabilities	—			—			—			25			—			25
Other current liabilities	62			15			38			300			—			415
Amounts due to Group undertakings	—			4,760			1,662			1,333			(7,755		)	—
Total current liabilities	64			4,794			1,728			10,664			(7,776		)	9,474
NON-CURRENT LIABILITIES
Investments in subsidiaries	985			—			—			—			(985		)	—
Long-term debt	795			782			733			1			—			2,311
Liabilities for pension benefits	—			—			—			136			—			136
Deferred tax liabilities	—			1			—			55			—			56
Provisions for liabilities	—			—			—			206			—			206
Other non-current liabilities	—			—			48			326			—			374
Non-current amounts due to Group undertakings	—			—			518			690			(1,208		)	—
Total non-current liabilities	1,780			783			1,299			1,414			(2,193		)	3,083
TOTAL LIABILITIES	$	1,844		$	5,577		$	3,027		$	12,078		$	(9,969	)	$	12,557
Condensed Consolidating Balance Sheet (continued)
	As of December 31, 2013
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
EQUITY
Total Willis Group Holdings stockholders’ equity	2,215			(1,114		)	71			3,918			(2,875		)	2,215
Noncontrolling interests	—			—			—			28			—			28
Total equity	2,215			(1,114		)	71			3,946			(2,875		)	2,243
TOTAL LIABILITIES AND EQUITY	$	4,059		$	4,463		$	3,098		$	16,024		$	(12,844	)	$	14,800
Condensed Consolidating Statement of Cash Flows	'																			'
	Condensed Consolidating Statement of Cash Flows
		Three months ended March 31, 2014
		Willis			The Other			The Issuer			Other			Consolidating			Consolidated
		Group			Guarantors									adjustments
		Holdings
		(millions)
	NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	$	(23	)	$	25		$	(21	)	$	25		$	(1	)	$	5
	CASH FLOWS FROM INVESTING ACTIVITIES
	Proceeds on disposal of fixed and intangible assets	—			—			1			1			(1		)	1
	Additions to fixed assets	—			(2		)	(2		)	(19		)	1			(22		)
	Additions to intangible assets	—			—			—			(1		)	—			(1		)
	Payments to acquire other investments	—			—			—			(4		)	—			(4		)
	Proceeds from sales of operations, net of cash disposed	—			—			—			5			—			5
	Proceeds from intercompany investing activities	65			12			120			115			(312		)	—
	Repayments of intercompany investing activities	—			—			—			(16		)	16			—
	Net cash provided by investing activities	65			10			119			81			(296		)	(21		)
	CASH FLOWS FROM FINANCING ACTIVITIES
	Debt issuance costs	—			—			—			(2		)	—			(2		)
	Repayments of debt	—			(4		)	—			—			—			(4		)
	Repurchase of shares	(35		)	—			—			—			—			(35		)
	Proceeds from issue of shares	43			—			—			—			—			43
	Excess tax benefits from share-based payment arrangements	—			—			—			1			—			1
	Dividends paid	(50		)	—			—			(1		)	1			(50		)
	Dividends paid to noncontrolling interests	—			—			—			(2		)	—			(2		)
	Proceeds from intercompany financing activities	—			16			—			—			(16		)	—
	Repayments of intercompany financing activities	—			(47		)	(98		)	(167		)	312			—
	Net cash used in financing activities	(42		)	(35		)	(98		)	(171		)	297			(49		)
	DECREASE IN CASH AND CASH EQUIVALENTS	—			—			—			(65		)	—			(65		)
	Effect of exchange rate changes on cash and cash equivalents	—			—			—			3			—			3
	CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	3			3			—			790			—			796
	CASH AND CASH EQUIVALENTS, END OF PERIOD	$	3		$	3		$	—		$	728		$	—		$	734
	Condensed Consolidating Statement of Cash Flows
		Three months ended March 31, 2013
		Willis			The Other			The Issuer			Other			Consolidating			Consolidated
		Group			Guarantors									adjustments
		Holdings
		(millions)
	NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	$	(23	)	$	(144	)	$	(102	)	$	308		$	—		$	39
	CASH FLOWS FROM INVESTING ACTIVITIES
	Proceeds on disposal of fixed and intangible assets	—			—			2			2			—			4
	Additions to fixed assets	—			(1		)	—			(22		)	—			(23		)
	Acquisitions of subsidiaries, net of cash acquired	—			—			—			(1		)	—			(1		)
	Payments to acquire other investments	—			—			—			(1		)	—			(1		)
	Proceeds from intercompany investing activities	180			148			10			—			(338		)	—
	Repayments of intercompany investing activities	(129		)	—			—			(235		)	364			—
	Net cash provided by (used in) investing activities	51			147			12			(257		)	26			(21		)
	CASH FLOWS FROM FINANCING ACTIVITIES
	Proceeds from draw down of revolving credit facility	—			55			—			—			—			55
	Repayments of debt	—			(4		)	—			—			—			(4		)
	Proceeds from issue of shares	19			—			—			—			—			19
	Dividends paid	(47		)	—			—			—			—			(47		)
	Acquisition of noncontrolling interests	—			—			—			(4		)	—			(4		)
	Dividends paid to noncontrolling interests	—			—			—			(1		)	—			(1		)
	Proceeds from intercompany financing activities	—			128			107			129			(364		)	—
	Repayments of intercompany financing activities	—			(180		)	(17		)	(141		)	338			—
	Net cash (used in) provided by financing activities	(28		)	(1		)	90			(17		)	(26		)	18
	INCREASE IN CASH AND CASH EQUIVALENTS	—			2			—			34			—			36
	Effect of exchange rate changes on cash and cash equivalents	—			—			—			(5		)	—			(5		)
	CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	1			—			—			499			—			500
	CASH AND CASH EQUIVALENTS, END OF PERIOD	$	1		$	2		$	—		$	528		$	—		$	531

FINANCIAL_INFORMATION_FOR_PARE3

FINANCIAL INFORMATION FOR PARENT ISSUER, GUARANTOR SUBSIDIARIES AND NON-GUARANTOR SUBSIDIARIES (Tables)	3 Months Ended
	Mar. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]	'
Condensed Consolidated Statement of Comprehensive Income	'
	Condensed Consolidating Statement of Operations
		Three months ended March 31, 2014
		Willis			The			Other			Consolidating			Consolidated
		Group			Guarantors						adjustments
		Holdings - the Parent Issuer
		(millions)
	REVENUES
	Commissions and fees	$	—		$	2		$	1,088		$	—		$	1,090
	Investment income	—			—			4			—			4
	Other income	—			—			3			—			3
	Total revenues	—			2			1,095			—			1,097
	EXPENSES
	Salaries and benefits	—			(19		)	(551		)	—			(570		)
	Other operating expenses	(4		)	(41		)	(120		)	—			(165		)
	Depreciation expense	—			(5		)	(18		)	—			(23		)
	Amortization of intangible assets	—			—			(13		)	—			(13		)
	Total expenses	(4		)	(65		)	(702		)	—			(771		)
	OPERATING (LOSS) INCOME	(4		)	(63		)	393			—			326
	Other income (expense)	—			1			(1		)	—			—
	Income from group undertakings	—			75			27			(102		)	—
	Expenses due to group undertakings	—			(27		)	(75		)	102			—
	Interest expense	(11		)	(20		)	(1		)	—			(32		)
	(LOSS) INCOME BEFORE INCOME TAXES AND INTEREST IN EARNINGS OF ASSOCIATES	(15		)	(34		)	343			—			294
	Income taxes	—			24			(87		)	—			(63		)
	(LOSS) INCOME BEFORE INTEREST IN EARNINGS OF ASSOCIATES	(15		)	(10		)	256			—			231
	Interest in earnings of associates, net of tax	—			3			16			—			19
	Equity account for subsidiaries	261			263			—			(524		)	—
	NET INCOME	246			256			272			(524		)	250
	Less: Net income attributable to noncontrolling interests	—			—			(4		)	—			(4		)
	NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	246		$	256		$	268		$	(524	)	$	246
	Condensed Consolidating Statement of Comprehensive Income
		Three months ended March 31, 2014
		Willis			The			Other			Consolidating			Consolidated
		Group			Guarantors						adjustments
		Holdings - the Parent Issuer
		(millions)
	Comprehensive income	$	254		$	264		$	281		$	(541	)	$	258
	Less: comprehensive income attributable to noncontrolling interests	—			—			(4		)	—			(4		)
	TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	254		$	264		$	277		$	(541	)	$	254
	Condensed Consolidating Statement of Operations
		Three months ended March 31, 2013
		Willis			The			Other			Consolidating			Consolidated
		Group			Guarantors						adjustments
		Holdings - the Parent Issuer
		(millions)
	REVENUES
	Commissions and fees	$	—		$	—		$	1,046		$	—		$	1,046
	Investment income	—			—			4			—			4
	Other income	—			—			1			—			1
	Total revenues	—			—			1,051			—			1,051
	EXPENSES
	Salaries and benefits	—			(23		)	(545		)	—			(568		)
	Other operating expenses	(1		)	(50		)	(111		)	—			(162		)
	Depreciation expense	—			(4		)	(22		)	—			(26		)
	Amortization of intangible assets	—			—			(14		)	—			(14		)
	Total expenses	(1		)	(77		)	(692		)	—			(770		)
	OPERATING (LOSS) INCOME	(1		)	(77		)	359			—			281
	Other (expense) income	(3		)	1			8			—			6
	Income from group undertakings	—			108			21			(129		)	—
	Expenses due to group undertakings	—			(21		)	(108		)	129			—
	Interest expense	(11		)	(19		)	(1		)	—			(31		)
	(LOSS) INCOME BEFORE INCOME TAXES AND INTEREST IN EARNINGS OF ASSOCIATES	(15		)	(8		)	279			—			256
	Income taxes	—			2			(50		)	—			(48		)
(LOSS) INCOME BEFORE INTEREST IN EARNINGS OF ASSOCIATES	(15		)	(6		)	229			—			208
Interest in earnings of associates, net of tax	—			2			13			—			15
Equity account for subsidiaries	234			239			—			(473		)	—
NET INCOME	219			235			242			(473		)	223
Less: Net income attributable to noncontrolling interests	—			—			(4		)	—			(4		)
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	219		$	235		$	238		$	(473	)	$	219
Condensed Consolidating Statement of Comprehensive Income
	Three months ended March 31, 2013
	Willis			The			Other			Consolidating			Consolidated
	Group			Guarantors						adjustments
	Holdings - the Parent Issuer
	(millions)
Comprehensive income	$	183		$	199		$	203		$	(399	)	$	186
Less: comprehensive income attributable to noncontrolling interests	—			—			(3		)	—			(3		)
TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	183		$	199		$	200		$	(399	)	$	183
Condensed Consolidated Balance Sheet	'
	Condensed Consolidating Balance Sheet
		As of March 31, 2014
		Willis			The Guarantors			Other			Consolidating			Consolidated
		Group									adjustments
		Holdings - the Parent Issuer
		(millions)
	ASSETS
	CURRENT ASSETS
	Cash and cash equivalents	$	3		$	3		$	728		$	—		$	734
	Accounts receivable, net	1			4			1,180			—			1,185
	Fiduciary assets	—			—			9,306			—			9,306
	Deferred tax assets	—			—			16			—			16
	Other current assets	1			53			183			(33		)	204
	Amounts due from group undertakings	3,989			813			1,456			(6,258		)	—
	Total current assets	3,994			873			12,869			(6,291		)	11,445
	NON-CURRENT ASSETS
	Investments in subsidiaries	—			4,089			—			(4,089		)	—
	Fixed assets, net	—			64			418			—			482
	Goodwill	—			—			2,835			—			2,835
	Other intangible assets, net	—			—			339			—			339
	Investments in associates	—			160			36			—			196
	Deferred tax assets	—			—			6			—			6
	Pension benefits asset	—			—			316			—			316
	Other non-current assets	3			15			191			—			209
	Non-current amounts due from group undertakings	—			703			—			(703		)	—
	Total non-current assets	3			5,031			4,141			(4,792		)	4,383
	TOTAL ASSETS	$	3,997		$	5,904		$	17,010		$	(11,083	)	$	15,828
	LIABILITIES AND STOCKHOLDERS’ EQUITY
	CURRENT LIABILITIES
	Fiduciary liabilities	$	—		$	—		$	9,306		$	—		$	9,306
	Deferred revenue and accrued expenses	2			14			355			—			371
	Income taxes payable	—			—			86			(33		)	53
	Short-term debt and current portion of long-term debt	—			15			—			—			15
	Deferred tax liabilities	—			—			36			—			36
	Other current liabilities	56			26			413			—			495
	Amounts due to group undertakings	—			5,130			1,128			(6,258		)	—
	Total current liabilities	58			5,185			11,324			(6,291		)	10,276
	NON-CURRENT LIABILITIES
	Investments in subsidiaries	702			—			—			(702		)	—
	Long-term debt	795			1,511			1			—			2,307
	Liabilities for pension benefits	—			—			130			—			130
	Deferred tax liabilities	—			1			77			—			78
	Provisions for liabilities	—			3			208			—			211
	Other non-current liabilities	—			41			313			—			354
	Non-current amounts due to group undertakings	—			—			703			(703		)	—
	Total non-current liabilities	1,497			1,556			1,432			(1,405		)	3,080
	TOTAL LIABILITIES	$	1,555		$	6,741		$	12,756		$	(7,696	)	$	13,356
	Condensed Consolidating Balance Sheet (continued)
		As of March 31, 2014
		Willis			The Guarantors			Other			Consolidating			Consolidated
		Group									adjustments
		Holdings - the Parent Issuer
		(millions)
	EQUITY
	Total Willis Group Holdings stockholders’ equity	2,442			(837		)	4,224			(3,387		)	2,442
	Noncontrolling interests	—			—			30			—			30
	Total equity	2,442			(837		)	4,254			(3,387		)	2,472
	TOTAL LIABILITIES AND EQUITY	$	3,997		$	5,904		$	17,010		$	(11,083	)	$	15,828
	Condensed Consolidating Balance Sheet
		As of December 31, 2013
		Willis			The Guarantors			Other			Consolidating			Consolidated
		Group									adjustments
		Holdings - the Parent Issuer
	(millions)
ASSETS
CURRENT ASSETS
Cash and cash equivalents	$	3		$	3		$	790		$	—		$	796
Accounts receivable, net	—			4			1,037			—			1,041
Fiduciary assets	—			—			8,412			—			8,412
Deferred tax assets	—			—			16			(1		)	15
Other current assets	1			31			186			(21		)	197
Amounts due to group undertakings	4,051			975			1,484			(6,510		)	—
Total current assets	4,055			1,013			11,925			(6,532		)	10,461
NON-CURRENT ASSETS
Investments in subsidiaries	—			3,788			—			(3,788		)	—
Fixed assets, net	—			66			415			—			481
Goodwill	—			—			2,838			—			2,838
Other intangible assets, net	—			—			353			—			353
Investments in associates	—			156			20			—			176
Deferred tax assets	—			—			7			—			7
Pension benefits asset	—			—			278			—			278
Other non-current assets	4			14			188			—			206
Non-current amounts due to group undertakings	—			690			—			(690		)	—
Total non-current assets	4			4,714			4,099			(4,478		)	4,339
TOTAL ASSETS	$	4,059		$	5,727		$	16,024		$	(11,010	)	$	14,800
LIABILITIES AND STOCKHOLDERS’ EQUITY
CURRENT LIABILITIES
Fiduciary liabilities	$	—		$	—		$	8,412		$	—		$	8,412
Deferred revenue and accrued expenses	2			29			555			—			586
Income taxes payable	—			3			39			(21		)	21
Short-term debt and current portion of long-term debt	—			15			—			—			15
Deferred tax liabilities	—			—			25			—			25
Other current liabilities	62			53			300			—			415
Amounts due to group undertakings	—			5,177			1,333			(6,510		)	—
Total current liabilities	64			5,277			10,664			(6,531		)	9,474
NON-CURRENT LIABILITIES
Investments in subsidiaries	985			—			—			(985		)	—
Long-term debt	795			1,515			1			—			2,311
Liabilities for pension benefits	—			—			136			—			136
Deferred tax liabilities	—			1			55			—			56
Provisions for liabilities	—			—			206			—			206
Other non-current liabilities	—			48			326			—			374
Non-current amounts due to group undertakings	—			—			690			(690		)	—
Total non-current liabilities	1,780			1,564			1,414			(1,675		)	3,083
TOTAL LIABILITIES	$	1,844		$	6,841		$	12,078		$	(8,206	)	$	12,557
Condensed Consolidating Balance Sheet (continued)
	As of December 31, 2013
	Willis			The Guarantors			Other			Consolidating			Consolidated
	Group									adjustments
	Holdings - the Parent Issuer
	(millions)
EQUITY
Total Willis Group Holdings stockholders’ equity	2,215			(1,114		)	3,918			(2,804		)	2,215
Noncontrolling interests	—			—			28			—			28
Total equity	2,215			(1,114		)	3,946			(2,804		)	2,243
TOTAL LIABILITIES AND EQUITY	$	4,059		$	5,727		$	16,024		$	(11,010	)	$	14,800
Condensed Consolidated Statement of Cash Flows	'
	Condensed Consolidating Statement of Cash Flows
		Three months ended March 31, 2014
		Willis			The Guarantors			Other			Consolidating			Consolidated
		Group									adjustments
		Holdings - the Parent Issuer
		(millions)
	NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	$	(23	)	$	4		$	25		$	(1	)	$	5
	CASH FLOWS FROM INVESTING ACTIVITIES
	Proceeds on disposal of fixed and intangible assets	—			1			1			(1		)	1
	Additions to fixed assets	—			(4		)	(19		)	1			(22		)
	Additions to intangible assets	—			—			(1		)	—			(1		)
	Payments to acquire other investments	—			—			(4		)	—			(4		)
	Proceeds from disposal of operations, net of cash disposed	—			—			5			—			5
	Proceeds from intercompany investing activities	65			120			115			(300		)	—
	Repayments of intercompany investing activities	—			—			(16		)	16			—
	Net cash provided by investing activities	65			117			81			(284		)	(21		)
	CASH FLOWS FROM FINANCING ACTIVITIES
	Debt issuance costs	—			—			(2		)	—			(2		)
	Repayments of debt	—			(4		)	—			—			(4		)
	Repurchase of shares	(35		)	—			—			—			(35		)
	Proceeds from issue of shares	43			—			—			—			43
	Excess tax benefits from share-based payment arrangement	—			—			1			—			1
	Dividends paid	(50		)	—			(1		)	1			(50		)
	Dividends paid to noncontrolling interests	—			—			(2		)	—			(2		)
	Proceeds from intercompany financing activities	—			16			—			(16		)	—
	Repayments of intercompany financing activities	—			(133		)	(167		)	300			—
	Net cash used in financing activities	(42		)	(121		)	(171		)	285			(49		)
	DECREASE IN CASH AND CASH EQUIVALENTS	—			—			(65		)	—			(65		)
	Effect of exchange rate changes on cash and cash equivalents	—			—			3			—			3
	CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	3			3			790			—			796
	CASH AND CASH EQUIVALENTS, END OF PERIOD	$	3		$	3		$	728		$	—		$	734
	Condensed Consolidating Statement of Cash Flows
		Three months ended March 31, 2013
		Willis			The Guarantors			Other			Consolidating			Consolidated
		Group									adjustments
		Holdings - the Parent Issuer
		(millions)
	NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	$	(23	)	$	(246	)	$	308		$	—		$	39
	CASH FLOWS FROM INVESTING ACTIVITIES
	Proceeds on disposal of fixed and intangible assets	—			2			2			—			4
	Additions to fixed assets	—			(1		)	(22		)	—			(23		)
	Acquisitions of subsidiaries, net of cash acquired	—			—			(1		)	—			(1		)
	Payments to acquire other investments	—			—			(1		)	—			(1		)
	Proceeds from intercompany investing activities	180			141			—			(321		)	—
	Repayments of intercompany investing activities	(129		)	—			(235		)	364			—
	Net cash provided by (used in) investing activities	51			142			(257		)	43			(21		)
	CASH FLOWS FROM FINANCING ACTIVITIES
	Proceeds from draw down of revolving credit facility	—			55			—			—			55
	Repayments of debt	—			(4		)	—			—			(4		)
	Proceeds from issue of shares	19			—			—			—			19
	Dividends paid	(47		)	—			—			—			(47		)
	Acquisition of noncontrolling interests	—			—			(4		)	—			(4		)
	Dividends paid to noncontrolling interests	—			—			(1		)	—			(1		)
	Proceeds from intercompany financing activities	—			235			129			(364		)	—
	Repayments of intercompany financing activities	—			(180		)	(141		)	321			—
	Net cash (used in) provided by financing activities	(28		)	106			(17		)	(43		)	18
	INCREASE IN CASH AND CASH EQUIVALENTS	—			2			34			—			36
	Effect of exchange rate changes on cash and cash equivalents	—			—			(5		)	—			(5		)
	CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	1			—			499			—			500
	CASH AND CASH EQUIVALENTS, END OF PERIOD	$	1		$	2		$	528		$	—		$	531

FINANCIAL_INFORMATION_FOR_ISSU1

FINANCIAL INFORMATION FOR ISSUER, PARENT GUARANTOR, OTHER GUARANTOR SUBSIDIARIES AND NON-GUARANTOR SUBSIDIARIES (Tables)	3 Months Ended
	Mar. 31, 2014
Condensed Financial Statements, Captions [Line Items]	'
Condensed Financial Statements [Text Block]	'
	Condensed Consolidating Statement of Operations
		Three months ended March 31, 2014
		Willis			The Other			The Issuer			Other			Consolidating			Consolidated
		Group			Guarantors									adjustments
		Holdings
		(millions)
	REVENUES
	Commissions and fees	$	—		$	2		$	—		$	1,088		$	—		$	1,090
	Investment income	—			—			—			4			—			4
	Other income	—			—			—			3			—			3
	Total revenues	—			2			—			1,095			—			1,097
	EXPENSES
	Salaries and benefits	—			(19		)	—			(551		)	—			(570		)
	Other operating expenses	(4		)	(41		)	—			(120		)	—			(165		)
	Depreciation expense	—			(5		)	—			(18		)	—			(23		)
	Amortization of intangible assets	—			—			—			(13		)	—			(13		)
	Total expenses	(4		)	(65		)	—			(702		)	—			(771		)
	OPERATING (LOSS) INCOME	(4		)	(63		)	—			393			—			326
	Other income (expense)	—			1			—			(1		)	—			—
	Income from group undertakings	—			82			22			27			(131		)	—
	Expenses due to group undertakings	—			(49		)	(7		)	(75		)	131			—
	Interest expense	(11		)	(11		)	(9		)	(1		)	—			(32		)
	(LOSS) INCOME BEFORE INCOME TAXES AND INTEREST IN EARNINGS OF ASSOCIATES	(15		)	(40		)	6			343			—			294
	Income taxes	—			25			(1		)	(87		)	—			(63		)
	(LOSS) INCOME BEFORE INTEREST IN EARNINGS OF ASSOCIATES	(15		)	(15		)	5			256			—			231
	Interest in earnings of associates, net of tax	—			3			—			16			—			19
	Equity account for subsidiaries	261			268			215			—			(744		)	—
	NET INCOME	246			256			220			272			(744		)	250
	Less: Net income attributable to noncontrolling interests	—			—			—			(4		)	—			(4		)
	NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	246		$	256		$	220		$	268		$	(744	)	$	246
	Condensed Consolidating Statement of Comprehensive Income
		Three months ended March 31, 2014
		Willis			The Other			The Issuer			Other			Consolidating			Consolidated
		Group			Guarantors									adjustments
		Holdings
		(millions)
	Comprehensive income	$	254		$	264		$	228		$	281		$	(769	)	$	258
	Less: comprehensive income attributable to noncontrolling interests	—			—			—			(4		)	—			(4		)
	TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	254		$	264		$	228		$	277		$	(769	)	$	254
	Condensed Consolidating Statement of Operations
		Three months ended March 31, 2013
		Willis			The Other			The Issuer			Other			Consolidating			Consolidated
		Group			Guarantors									adjustments
		Holdings
		(millions)
	REVENUES
	Commissions and fees	$	—		$	—		$	—		$	1,046		$	—		$	1,046
	Investment income	—			—			—			4			—			4
	Other income	—			—			—			1			—			1
	Total revenues	—			—			—			1,051			—			1,051
	EXPENSES
	Salaries and benefits	—			(23		)	—			(545		)	—			(568		)
	Other operating expenses	(1		)	(50		)	—			(111		)	—			(162		)
	Depreciation expense	—			(4		)	—			(22		)	—			(26		)
	Amortization of intangible assets	—			—			—			(14		)	—			(14		)
	Total expenses	(1		)	(77		)	—			(692		)	—			(770		)
	OPERATING (LOSS) INCOME	(1		)	(77		)	—			359			—			281
	Other (expense) income	(3		)	1			—			8			—			6
	Income from group undertakings	—			114			13			21			(148		)	—
	Expenses due to group undertakings	—			(34		)	(6		)	(108		)	148			—
	Interest expense	(11		)	(17		)	(2		)	(1		)	—			(31		)
	(LOSS) INCOME BEFORE INCOME TAXES AND INTEREST IN EARNINGS OF ASSOCIATES	(15		)	(13		)	5			279			—			256
	Income taxes	—			2			—			(50		)	—			(48		)
(LOSS) INCOME BEFORE INTEREST IN EARNINGS OF ASSOCIATES	(15		)	(11		)	5			229			—			208
Interest in earnings of associates, net of tax	—			2			—			13			—			15
Equity account for subsidiaries	234			244			217			—			(695		)	—
NET INCOME	219			235			222			242			(695		)	223
Less: Net income attributable to noncontrolling interests	—			—			—			(4		)	—			(4		)
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	219		$	235		$	222		$	238		$	(695	)	$	219
Condensed Consolidating Statement of Comprehensive Income
	Three months ended March 31, 2013
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
Comprehensive income	$	183		$	199		$	191		$	203		$	(590	)	$	186
Less: comprehensive income attributable to noncontrolling interests	—			—			—			(3		)	—			(3		)
TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$	183		$	199		$	191		$	200		$	(590	)	$	183
Condensed Consolidating Balance Sheet
	As of March 31, 2014
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
ASSETS
CURRENT ASSETS
Cash and cash equivalents	$	3		$	3		$	—		$	728		$	—		$	734
Accounts receivable, net	1			4			—			1,180			—			1,185
Fiduciary assets	—			—			—			9,306			—			9,306
Deferred tax assets	—			—			—			16			—			16
Other current assets	1			59			1			183			(40		)	204
Amounts due from group undertakings	3,989			813			803			1,456			(7,061		)	—
Total current assets	3,994			879			804			12,869			(7,101		)	11,445
NON-CURRENT ASSETS
Investments in subsidiaries	—			4,024			2,940			—			(6,964		)	—
Fixed assets, net	—			64			—			418			—			482
Goodwill	—			—			—			2,835			—			2,835
Other intangible assets, net	—			—			—			339			—			339
Investments in associates	—			160			—			36			—			196
Deferred tax assets	—			—			—			6			—			6
Pension benefits asset	—			—			—			316			—			316
Other non-current assets	3			6			9			191			—			209
Non-current amounts due from group undertakings	—			1,132			518			—			(1,650		)	—
Total non-current assets	3			5,386			3,467			4,141			(8,614		)	4,383
TOTAL ASSETS	$	3,997		$	6,265		$	4,271		$	17,010		$	(15,715	)	$	15,828
LIABILITIES AND STOCKHOLDERS’ EQUITY
CURRENT LIABILITIES
Fiduciary liabilities	$	—		$	—		$	—		$	9,306		$	—		$	9,306
Deferred revenue and accrued expenses	2			14			—			355			—			371
Income taxes payable	—			—			7			86			(40		)	53
Short-term debt and current portion of long-term debt	—			—			15			—			—			15
Deferred tax liabilities	—			—			—			36			—			36
Other current liabilities	56			23			3			413			—			495
Amounts due to group undertakings	—			5,768			165			1,128			(7,061		)	—
Total current liabilities	58			5,805			190			11,324			(7,101		)	10,276
NON-CURRENT LIABILITIES
Investments in subsidiaries	702			—			—			—			(702		)	—
Long-term debt	795			733			778			1			—			2,307
Liabilities for pension benefits	—			—			—			130			—			130
Deferred tax liabilities	—			1			—			77			—			78
Provisions for liabilities	—			3			—			208			—			211
Other non-current liabilities	—			41			—			313			—			354
Non-current amounts due to group undertakings	—			519			428			703			(1,650		)	—
Total non-current liabilities	1,497			1,297			1,206			1,432			(2,352		)	3,080
TOTAL LIABILITIES	$	1,555		$	7,102		$	1,396		$	12,756		$	(9,453	)	$	13,356
Condensed Consolidating Balance Sheet (continued)
	As of March 31, 2014
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
EQUITY
Total Willis Group Holdings stockholders’ equity	2,442			(837		)	2,875			4,224			(6,262		)	2,442
Noncontrolling interests	—			—			—			30			—			30
Total equity	2,442			(837		)	2,875			4,254			(6,262		)	2,472
TOTAL LIABILITIES AND EQUITY	$	3,997		$	6,265		$	4,271		$	17,010		$	(15,715	)	$	15,828
Condensed Consolidating Balance Sheet
	As of December 31, 2013
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
ASSETS
CURRENT ASSETS
Cash and cash equivalents	$	3		$	3		$	—		$	790		$	—		$	796
Accounts receivable, net	—			4			—			1,037			—			1,041
Fiduciary assets	—			—			—			8,412			—			8,412
Deferred tax assets	—			—			—			16			(1		)	15
Other current assets	1			36			1			186			(27		)	197
Amounts due from group undertakings	4,051			975			793			1,484			(7,303		)	—
Total current assets	4,055			1,018			794			11,925			(7,331		)	10,461
NON-CURRENT ASSETS
Investments in subsidiaries	—			3,716			2,705			—			(6,421		)	—
Fixed assets, net	—			66			—			415			—			481
Goodwill	—			—			—			2,838			—			2,838
Other intangible assets, net	—			—			—			353			—			353
Investments in associates	—			156			—			20			—			176
Deferred tax assets	—			—			—			7			—			7
Pension benefits asset	—			—			—			278			—			278
Other non-current assets	4			5			9			188			—			206
Non-current amounts due from group undertakings	—			1,113			518			—			(1,631		)	—
Total non-current assets	4			5,056			3,232			4,099			(8,052		)	4,339
TOTAL ASSETS	$	4,059		$	6,074		$	4,026		$	16,024		$	(15,383	)	$	14,800
LIABILITIES AND STOCKHOLDERS’ EQUITY
CURRENT LIABILITIES
Fiduciary liabilities	$	—		$	—		$	—		$	8,412		$	—		$	8,412
Deferred revenue and accrued expenses	2			29			—			555			—			586
Income taxes payable	—			4			5			39			(27		)	21
Short-term debt and current portion of long-term debt	—			—			15			—			—			15
Deferred tax liabilities	—			—			—			25			—			25
Other current liabilities	62			42			11			300			—			415
Amounts due to group undertakings	—			5,813			157			1,333			(7,303		)	—
Total current liabilities	64			5,888			188			10,664			(7,330		)	9,474
NON-CURRENT LIABILITIES
Investments in subsidiaries	985			—			—			—			(985		)	—
Long-term debt	795			733			782			1			—			2,311
Liabilities for pension benefits	—			—			—			136			—			136
Deferred tax liabilities	—			1			—			55			—			56
Provisions for liabilities	—			—			—			206			—			206
Other non-current liabilities	—			48			—			326			—			374
Non-current amounts due to group undertakings	—			518			423			690			(1,631		)	—
Total non-current liabilities	1,780			1,300			1,205			1,414			(2,616		)	3,083
TOTAL LIABILITIES	$	1,844		$	7,188		$	1,393		$	12,078		$	(9,946	)	$	12,557
	As of December 31, 2013
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
EQUITY
Total Willis Group Holdings stockholders’ equity	2,215			(1,114		)	2,633			3,918			(5,437		)	2,215
Noncontrolling interests	—			—			—			28			—			28
Total equity	2,215			(1,114		)	2,633			3,946			(5,437		)	2,243
TOTAL LIABILITIES AND EQUITY	$	4,059		$	6,074		$	4,026		$	16,024		$	(15,383	)	$	14,800
Condensed Consolidating Statement of Cash Flows
	Three months ended March 31, 2014
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	$	(23	)	$	28		$	(24	)	$	25		$	(1	)	$	5
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds on disposal of fixed and intangible assets	—			1			—			1			(1		)	1
Additions to fixed assets	—			(4		)	—			(19		)	1			(22		)
Additions to intangible assets	—			—			—			(1		)	—			(1		)
Payments to acquire other investments	—			—			—			(4		)	—			(4		)
Proceeds from disposal of operations, net of cash disposed	—			—			—			5			—			5
Proceeds from intercompany investing activities	65			120			12			115			(312		)	—
Repayments of intercompany investing activities	—			—			—			(16		)	16			—
Net cash provided by investing activities	65			117			12			81			(296		)	(21		)
CASH FLOWS FROM FINANCING ACTIVITIES
Debt issuance costs	—			—			—			(2		)	—			(2		)
Repayments of debt	—			—			(4		)	—			—			(4		)
Repurchase of shares	(35		)	—			—			—			—			(35		)
Proceeds from issue of shares	43			—			—			—			—			43
Excess tax benefits from share-based payment arrangements	—			—			—			1			—			1
Dividends paid	(50		)	—			—			(1		)	1			(50		)
Dividends paid to noncontrolling interests	—			—			—			(2		)	—			(2		)
Proceeds from intercompany financing activities	—			—			16			—			(16		)	—
Repayments of intercompany financing activities	—			(145		)	—			(167		)	312			—
Net cash (used in) provided by financing activities	(42		)	(145		)	12			(171		)	297			(49		)
DECREASE IN CASH AND CASH EQUIVALENTS	—			—			—			(65		)	—			(65		)
Effect of exchange rate changes on cash and cash equivalents	—			—			—			3			—			3
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	3			3			—			790			—			796
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	3		$	3		$	—		$	728		$	—		$	734
Condensed Consolidating Statement of Cash Flows
	Three months ended March 31, 2013
	Willis			The Other			The Issuer			Other			Consolidating			Consolidated
	Group			Guarantors									adjustments
	Holdings
	(millions)
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	$	(23	)	$	467		$	(156	)	$	308		$	(557	)	$	39
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds on disposal of fixed and intangible assets	—			2			—			2			—			4
Additions to fixed assets	—			(1		)	—			(22		)	—			(23		)
Acquisitions of subsidiaries, net of cash acquired	—			—			—			(1		)	—			(1		)
Payments to acquire other investments	—			—			—			(1		)	—			(1		)
Proceeds from intercompany investing activities	180			53			148			—			(381		)	—
Repayments of intercompany investing activities	(129		)	(557		)	—			(235		)	921			—
Net cash provided by (used in) investing activities	51			(503		)	148			(257		)	540			(21		)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from draw down of revolving credit facility	—			—			55			—			—			55
Repayments of debt	—			—			(4		)	—			—			(4		)
Proceeds from issue of shares	19			—			—			—			—			19
Dividends paid	(47		)	—			(557		)	—			557			(47		)
Acquisition of noncontrolling interests	—			—			—			(4		)	—			(4		)
Dividends paid to noncontrolling interests	—			—			—			(1		)	—			(1		)
Proceeds from intercompany financing activities	—			235			557			129			(921		)	—
Repayments of intercompany financing activities	—			(197		)	(43		)	(141		)	381			—
Net cash (used in) provided by financing activities	(28		)	38			8			(17		)	17			18
INCREASE IN CASH AND CASH EQUIVALENTS	—			2			—			34			—			36
Effect of exchange rate changes on cash and cash equivalents	—			—			—			(5		)	—			(5		)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	1			—			—			499			—			500
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	1		$	2		$	—		$	528		$	—		$	531

BASIS_OF_PRESENTATION_AND_SIGN1

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES Unrecognized tax benefit when a net operating loss carryforward exists (Details) (USD $)	Mar. 31, 2014
In Millions, unless otherwise specified
Unrecognized tax benefit when a net operating loss carryforward exists [Abstract]	'
Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward	$21

SALARIES_AND_BENEFITS_EXPENSE_

SALARIES AND BENEFITS EXPENSE (Additional Information) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
		Positions
Restructuring Cost and Reserve [Line Items]	'	'
Restructuring and Related Cost, Number of Positions Eliminated	'	207
Labor and Related Expense	$570	$568
Employee Severance [Member]	'	'
Restructuring Cost and Reserve [Line Items]	'	'
Severance costs	3	0
Expense Reduction Initiative [Member]	'	'
Restructuring Cost and Reserve [Line Items]	'	'
Severance costs	'	28
Labor and Related Expense	'	$29

OTHER_INCOME_EXPENSE_NET_Detai

OTHER INCOME (EXPENSE), NET (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Other Income Expense [Abstract]	'	'
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	($3)	$0
Foreign Currency Transaction Gain (Loss), Realized	3	6
Other Nonoperating Income (Expense)	$0	$6

INCOME_TAXES_Components_of_Tax

INCOME TAXES (Components of Tax Charge) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Income Tax Examination [Line Items]	'	'
INCOME BEFORE INCOME TAXES AND INTEREST IN EARNINGS OF ASSOCIATES	$294	$256
Tax amount as reported	-63	-48
Effective tax rate as reported	21.00%	19.00%
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	-3	0
Effective tax rate reconciliation amount from disposal of operation loss	1	'
Effective tax rate reconciliation percent from disposal of operation loss	33.00%	'
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount	-2	'
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Percent	0.00%	'
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%	'
Non-US income tax authorities [Member]	'	'
Income Tax Examination [Line Items]	'	'
Ordinary income taxed at estimated annual effective tax rate, Income before tax	232	218
Ordinary income taxed at estimated annual effective tax rate, Tax amount	-50	-45
Effective tax rate as reported	22.00%	21.00%
UNITED STATES	'	'
Income Tax Examination [Line Items]	'	'
Ordinary income taxed at estimated annual effective tax rate, Income before tax	65	38
Ordinary income taxed at estimated annual effective tax rate, Tax amount	($12)	($3)
Effective tax rate as reported	18.00%	8.00%

EARNINGS_PER_SHARE_Additional_

EARNINGS PER SHARE (Additional Information) (Details)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]	'	'
Outstanding Time Based Stock Options	7	9.6
Outstanding performance-based stock options	5	6.3
Restricted stock units outstanding	2.9	2.4
Antidilutive stock options	1.8	7.8

EARNINGS_PER_SHARE_Basic_and_D

EARNINGS PER SHARE (Basic and Diluted Earnings Per Share) (Details) (USD $)	3 Months Ended
Share data in Millions, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]	'	'
Net income attributable to Willis Group Holdings	$246,000,000	$219,000,000
Basic average number of shares outstanding	179	173
Dilutive effect of potentially issuable shares	3	3
Diluted average number of shares outstanding	182	176
Income (Loss) from Continuing Operations, Per Basic Share	$1.37	$1.27
Net income attributable to Willis Group Holdings shareholders	$1.37	$1.27
Dilutive Securities, Effect on Basic Earnings Per Share	($0.02)	($0.03)
Income (Loss) from Continuing Operations, Per Diluted Share	$1.35	$1.24
Net income attributable to Willis Group Holdings shareholders	$1.35	$1.24

PENSION_PLANS_Components_of_Ne

PENSION PLANS (Components of Net Periodic Benefit (Income) Cost) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Defined Benefit Plan Disclosure [Line Items]	'	'
Net periodic benefit (income) cost	($4)	($1)
UK Defined Benefit Pension Plan [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Service cost	11	9
Interest cost	30	27
Expected return on plan assets	-54	-47
Amortization of unrecognized prior service gain	-1	-1
Amortization of unrecognized actuarial loss	11	11
Net periodic benefit (income) cost	-3	-1
US Defined Benefit Pension Plans [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Service cost	0	0
Interest cost	10	10
Expected return on plan assets	-13	-13
Amortization of unrecognized prior service gain	0	0
Amortization of unrecognized actuarial loss	1	2
Net periodic benefit (income) cost	-2	-1
International and US non-qualified Defined Benefit Pension Plans [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Service cost	0	1
Interest cost	2	1
Expected return on plan assets	-1	-1
Amortization of unrecognized prior service gain	0	0
Amortization of unrecognized actuarial loss	0	0
Net periodic benefit (income) cost	$1	$1

PENSION_PLANS_Additional_Infor

PENSION PLANS (Additional Information) (Details)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
	USD ($)	GBP (£)	UK Defined Benefit Pension Plan [Member]	UK Defined Benefit Pension Plan [Member]	US Defined Benefit Pension Plans [Member]	US Defined Benefit Pension Plans [Member]	International and US non-qualified Defined Benefit Pension Plans [Member]	International and US non-qualified Defined Benefit Pension Plans [Member]
			USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'	'	'	'	'
Cash contributions made to defined benefit pension plans	'	'	$21	$30	$2	$9	$2	$2
Employee cash contributions made to defined benefit pension plans	'	'	3	3	'	'	'	'
Estimated contributions made to defined benefit pension plans	'	'	83	'	'	'	'	'
Contribution related to on going calculations	'	'	23	'	'	'	'	'
Contribution rate for normal on-going contributions	'	'	15.90%	'	'	'	'	'
Contributions towards funding the deficit	'	'	60	'	'	'	'	'
Percentage of contribution based on profit share calculation expected for the current fiscal year	20.00%	20.00%	'	'	'	'	'	'
EBITDA required to trigger additional profit share contributions	900	'	'	'	'	'	'	'
Percentage of exceptional return calculations made to shareholders	10.00%	10.00%	'	'	'	'	'	'
Maximum contributions payable from deficit funding contributions and profit share contributions over the six years ended December 31, 2017	520	312	'	'	'	'	'	'
Estimated full year employee contributions	'	'	12	'	30	'	'	'
Contributions made to defined benefit pension plans	'	'	'	'	'	'	$9	'

COMMITMENTS_AND_CONTINGENCIES_

COMMITMENTS AND CONTINGENCIES (Additional Information) (Details) (USD $)

3 Months Ended

1 Months Ended

3 Months Ended

1 Months Ended

3 Months Ended

In Millions, unless otherwise specified

Mar. 31, 2014

Mar. 31, 2013

Jul. 02, 2009

Aug. 06, 2009

Sep. 14, 2009

Sep. 16, 2010

Mar. 11, 2011

Jul. 31, 2010

Mar. 31, 2014

31-May-11

Mar. 31, 2014

Feb. 08, 2013

Feb. 14, 2013

Feb. 14, 2013

Feb. 14, 2013

Feb. 14, 2013

Feb. 14, 2013

Oct. 01, 2013

Troice [Member]

Canabal [Member]

Rupert [Member]

Casanova [Member]

Rishmague [Member]

Trident V Parallel Fund [Member]

Trident V Parallel Fund [Member]

Dowling Capital Partners I [Member]

Dowling Capital Partners I [Member]

MacArthur [Member]

Barbar [Member]

de Gadala-Maria [Member]

Ranni et ano [Member]

Tisminesky [Member]

Zacarias [Member]

Janvey [Member]

Loss Contingencies [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Capital commitments

'

'

'

'

'

'

'

$25

'

$10

'

'

'

'

'

'

'

'

Capital contributions

4

1

'

'

'

'

'

'

19

'

4

'

'

'

'

'

'

'

Minimum damage sought

'

'

$1,000

$1,000

$300

$5

$37

'

'

'

'

$4

$30

$83.50

$3

$6.50

$12.50

$1,000

DERIVATIVE_FINANCIAL_INSTRUMEN2

DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Additional Information) (Details) (USD $)

3 Months Ended

0 Months Ended

3 Months Ended

3 Months Ended

3 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

3 Months Ended

In Millions, unless otherwise specified

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Jul. 22, 2013

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Jul. 22, 2013

Mar. 31, 2014

Apr. 28, 2014

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2010

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Sep. 30, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Dec. 31, 2013

Aug. 15, 2013

Sep. 30, 2013

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Mar. 31, 2014

Senior Notes [Member]

Seven Year Term Loan Facility [Member]

Seven Year Term Loan Facility [Member]

Revolving Credit Facility Three [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility Four [Member]

Revolving Credit Facility Four [Member]

Senior Notes Due Two Thousand Fifteen [Member]

Senior Notes Due Two Thousand Fifteen [Member]

Senior Notes Due Two Thousand Fifteen [Member]

Interest Rate Swaps [Member]

Interest Rate Swaps [Member]

Treasury Lock [Member]

Treasury Lock [Member]

Treasury Lock [Member]

Currency Swap [Member]

Currency Swap [Member]

Term Loan Facility [Member]

Fair Value Adjustment On Five Point Six Two Five Percentage Senior Notes Due Two Thousand Fifteen [Member]

Fair Value Adjustment On Five Point Six Two Five Percentage Senior Notes Due Two Thousand Fifteen [Member]

Fair Value Adjustment On Five Point Six Two Five Percentage Senior Notes Due Two Thousand Fifteen [Member]

Fair Value Hedging [Member]

Eurocurrency Rate Loans [Member]

Federal Funds Purchased [Member]

Variable based on LIBOR [Member]

Prime Rate [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Inputs, Level 2 [Member]

Other Assets [Member]

Other Assets [Member]

CreditFacility

Subsequent Event [Member]

Interest Rate Swaps [Member]

Revolving Credit Facility Four [Member]

Revolving Credit Facility Four [Member]

Revolving Credit Facility Four [Member]

Revolving Credit Facility Four [Member]

Fair Value, Measurements, Recurring [Member]

Forward Contracts [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Measurements, Recurring [Member]

Estimate of Fair Value Measurement [Member]

Forward Contracts [Member]

Derivative Instruments, Gain (Loss) [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative Asset

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$24

$23

$23

'

$24

Derivative Asset, Fair Value, Gross Asset

24

23

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

23

'

Amortization of prior loss recognized on item no longer in hedging relationship

'

'

'

'

'

'

'

'

'

'

'

'

'

0

-2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative, Notional Amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

158

228

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value of swaps at close out date

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

21

'

'

'

'

'

'

13

'

'

'

'

'

'

'

'

'

Gain in Other comprehensive income in connection with the terminated derivative instruments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

19

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Face Amount

'

'

2,054

'

'

'

'

'

'

'

'

'

350

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5-year term loan facility balance

'

'

'

'

270

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maturity Period Of Term Loan

'

'

'

'

'7 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Interest Rate Description

'

'

'

'

'

'

'LIBOR plus 1.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'LIBOR plus 1.50%

'

'

'

'

'LIBOR plus 1.50% to 2.25%

'Federal Funds rates plus 0.5%

'LIBOR plus 1.00%, plus 0.5% to 1.25%

' 'prime rate'

'

'

'

'

'

Revolving credit facilities available

'

'

'

'

'

22

800

500

300

400

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Maturity Date

'

'

'

16-Dec-16

23-Jul-18

'

23-Jul-18

'

3-Mar-15

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of Revolving Facilities

'

'

'

'

'

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revolving credit facility

'

'

'

'

'

'

0

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maturity date of interest rate swaps

15-Jul-15

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of loan notes

'

'

'

'

'

'

'

'

'

'

5.63%

5.63%

5.63%

'

'

'

'

'

'

'

'

5.63%

5.63%

'

'

'

'

'

'

'

'

'

'

'

Write down of the fair value adjustment to the carrying value of senior notes in connection with interest rate swap

'

'

'

'

'

'

'

'

'

'

'

'

'

7

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Senior Notes, Noncurrent

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4

4

5

'

'

'

'

'

'

'

'

'

'

Net derivative (gains) reclassified from accumulated comprehensive income into earnings within the next twelve months

21

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

DERIVATIVE_FINANCIAL_INSTRUMEN3

DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Forward Contracts by Major Currency) (Details) (USD $)	Mar. 31, 2014
In Millions, unless otherwise specified
US Dollar [Member]	'
Derivative [Line Items]	'
Derivative, Notional Amount	$447
Foreign Currency Fair Value Hedge Derivative at Fair Value	20
Euro [Member]	'
Derivative [Line Items]	'
Derivative, Notional Amount	155
Foreign Currency Fair Value Hedge Derivative at Fair Value	-2
Japanese Yen [Member]	'
Derivative [Line Items]	'
Derivative, Notional Amount	45
Foreign Currency Fair Value Hedge Derivative at Fair Value	$4

DERIVATIVE_FINANCIAL_INSTRUMEN4

DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Balance Sheet Disclosures) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Assets:	'	'
Derivative assets financial and hedging instruments, fair value	$24	$23
Liabilities:	'	'
Derivative liabilities financial and hedging instruments, fair value	2	2
Other Assets [Member] | Forward Exchange Contracts [Member]	'	'
Assets:	'	'
Derivative assets financial and hedging instruments, fair value	'	23
Other Liabilities [Member] | Forward Exchange Contracts [Member]	'	'
Liabilities:	'	'
Derivative liabilities financial and hedging instruments, fair value	'	$2

DERIVATIVE_FINANCIAL_INSTRUMEN5

DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Effects of Gains/(Losses) on Derivative Financial Instruments) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]	'		'
Amount of gain (loss) recognized in OCI(i) (effective element)	$0	[1]	($13)	[1]
Amount of gain (loss) reclassified from accumulated OCI(i) into income (effective element)	-1	[1]	-3	[1]
Amount of gain (loss) recognized in income (ineffective hedges and ineffective element of effective hedges)	0		0
Interest Rate Swaps [Member]	'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'
Amount of gain (loss) recognized in OCI(i) (effective element)	0		0	[1]
Interest Rate Swaps [Member] | Investment Income [Member]	'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'
Amount of gain (loss) reclassified from accumulated OCI(i) into income (effective element)	-2	[1]	-1	[1]
Interest Rate Swaps [Member] | Operating Expense [Member]	'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'
Amount of gain (loss) recognized in income (ineffective hedges and ineffective element of effective hedges)	0		0
Forward Exchange Contracts [Member]	'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'
Amount of gain (loss) recognized in OCI(i) (effective element)	0		-13	[1]
Forward Exchange Contracts [Member] | Interest Expense [Member]	'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'
Amount of gain (loss) recognized in income (ineffective hedges and ineffective element of effective hedges)	0		0
Forward Exchange Contracts [Member] | Operating Expense [Member]	'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'
Amount of gain (loss) reclassified from accumulated OCI(i) into income (effective element)	$1		($2)	[1]
[1]	Other Comprehensive Income

DERIVATIVE_FINANCIAL_INSTRUMEN6

DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Fair Value Hedging Relationships) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2010
In Millions, unless otherwise specified	Five Point Six Two Five Percent Senior Notes Due Two Thousand Fifteen [Member]	Five Point Six Two Five Percent Senior Notes Due Two Thousand Fifteen [Member]	Interest Rate Swaps [Member]	Interest Rate Swaps [Member]	Senior Notes Due Two Thousand Fifteen [Member]	Senior Notes Due Two Thousand Fifteen [Member]	Senior Notes Due Two Thousand Fifteen [Member]
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'	'	'	'
Debt Instrument, Interest Rate, Stated Percentage	5.63%	5.63%	'	'	5.63%	5.63%	5.63%
Hedged item in fair value hedging relationship	'	'	'5.625% senior notes due 2015	'5.625% senior notes due 2015	'	'	'
Change in unrecognized gain (loss) from derivatives no longer in fair value hedging relationships	'	'	'	$0	'	'	'
Amortization of prior loss recognized on item no longer in hedging relationship	'	'	0	2	'	'	'
Ineffectiveness recognized in interest expense	'	'	$0	$2	'	'	'

FAIR_VALUE_MEASUREMENT_Assets_

FAIR VALUE MEASUREMENT (Assets and Liabilities Measured on Recurring Basis) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Assets at fair value:	'	'
Cash and cash equivalents	$734	'
Liabilities at fair value:	'	'
Derivative Liability, Fair Value, Gross Liability	2	2
Fair Value, Measurements, Recurring [Member]	'	'
Assets at fair value:	'	'
Cash and cash equivalents	734	796
Fiduciary funds (included within Fiduciary assets)	1,953	1,662
Derivative financial instruments	24	23
Total assets	2,711	2,481
Liabilities at fair value:	'	'
Derivative financial instruments	2	2
Total liabilities	2	2
Quoted Prices In Active Markets For Identical Assets Level 1 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Assets at fair value:	'	'
Cash and cash equivalents	'	796
Fiduciary funds (included within Fiduciary assets)	1,953	1,662
Derivative financial instruments	'	0
Total assets	2,687	2,458
Liabilities at fair value:	'	'
Derivative financial instruments	'	0
Total liabilities	'	0
Significant Other Observable Inputs Level 2 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Assets at fair value:	'	'
Cash and cash equivalents	0	0
Fiduciary funds (included within Fiduciary assets)	0	0
Derivative financial instruments	'	23
Total assets	24	23
Liabilities at fair value:	'	'
Derivative financial instruments	'	2
Total liabilities	2	2
Significant Other Unobservable Inputs Level 3 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Assets at fair value:	'	'
Cash and cash equivalents	0	0
Fiduciary funds (included within Fiduciary assets)	0	0
Derivative financial instruments	0	0
Total assets	0	0
Liabilities at fair value:	'	'
Derivative financial instruments	0	0
Total liabilities	0	0
Estimate of Fair Value Measurement [Member]	'	'
Liabilities at fair value:	'	'
Derivative financial instruments	'	2
Forward Contracts [Member] | Other Assets [Member] | Estimate of Fair Value Measurement [Member] | Significant Other Observable Inputs Level 2 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Assets at fair value:	'	'
Derivative financial instruments	$24	'

FAIR_VALUE_MEASUREMENT_Estimat

FAIR VALUE MEASUREMENT (Estimated Fair Values) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Liabilities:	'	'
Long-term debt	$2,307	$2,311
Derivative Liability, Fair Value, Gross Liability	2	2
Fair Value [Member]	'	'
Assets:	'	'
Derivative financial instruments	'	23
Liabilities:	'	'
Current portion of long-term debt	15	15
Long-term debt	2,467	2,444
Derivative financial instruments	'	2
Carrying Amount [Member]	'	'
Assets:	'	'
Derivative financial instruments	'	23
Liabilities:	'	'
Current portion of long-term debt	15	15
Long-term debt	2,307	2,311
Derivative financial instruments	'	2
Forward Exchange Contracts [Member] | Other Liabilities [Member]	'	'
Liabilities:	'	'
Derivative Liability, Fair Value, Gross Liability	'	2
Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative Asset	24	23
Liabilities:	'	'
Derivative financial instruments	2	2
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative Asset	'	23
Liabilities:	'	'
Derivative financial instruments	'	2
Fair Value, Measurements, Recurring [Member] | Forward Exchange Contracts [Member] | Other Assets [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Derivative Asset	24	'
Fair Value, Measurements, Recurring [Member] | Forward Exchange Contracts [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value [Member]	'	'
Liabilities:	'	'
Derivative Liability, Fair Value, Gross Liability	$2	'

GOODWILL_Goodwill_by_Segment_D

GOODWILL (Goodwill by Segment) (Details) (USD $)	3 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]	'	'
Tax Benefit Arising On Exercise Of Fully Vested Stock Options	$0	($1)
Goodwill, Gross	3,330	3,319
Goodwill, Impaired, Accumulated Impairment Loss	-492	-492
Goodwill, Net	2,838	2,827
Purchase price allocation adjustments	'	-1
Goodwill acquired during the period	'	16
Goodwill disposed of during the year	-4	-14
Goodwill, Other Changes	0	-1
Foreign exchange	1	11
Goodwill, Gross	3,327	3,330
Goodwill, Impaired, Accumulated Impairment Loss	-492	-492
Goodwill, Ending Balance	2,835	2,838
Global	'	'
Goodwill [Line Items]	'	'
Goodwill, Gross	1,145	1,127
Goodwill, Impaired, Accumulated Impairment Loss	0	0
Goodwill, Net	1,145	1,127
Purchase price allocation adjustments	'	0
Goodwill acquired during the period	'	15
Goodwill disposed of during the year	0	0
Goodwill, Other Changes	88	0
Foreign exchange	1	3
Goodwill, Gross	1,234	1,145
Goodwill, Impaired, Accumulated Impairment Loss	0	0
Goodwill, Ending Balance	1,234	1,145
North America	'	'
Goodwill [Line Items]	'	'
Goodwill, Gross	1,776	1,792
Goodwill, Impaired, Accumulated Impairment Loss	-492	-492
Goodwill, Net	1,284	1,300
Purchase price allocation adjustments	'	-1
Goodwill acquired during the period	'	0
Goodwill disposed of during the year	-4	-14
Goodwill, Other Changes	-45	-1
Foreign exchange	0	0
Goodwill, Gross	1,727	1,776
Goodwill, Impaired, Accumulated Impairment Loss	-492	-492
Goodwill, Ending Balance	1,235	1,284
International	'	'
Goodwill [Line Items]	'	'
Goodwill, Gross	409	400
Goodwill, Impaired, Accumulated Impairment Loss	0	0
Goodwill, Net	409	400
Purchase price allocation adjustments	'	0
Goodwill acquired during the period	'	1
Goodwill disposed of during the year	0	0
Goodwill, Other Changes	-43	0
Foreign exchange	0	8
Goodwill, Gross	366	409
Goodwill, Impaired, Accumulated Impairment Loss	0	0
Goodwill, Ending Balance	$366	$409

OTHER_INTANGIBLE_ASSETS_NET_Ma

OTHER INTANGIBLE ASSETS, NET (Major Classes of Amortizable Intangible Assets) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]	'	'	'
Amortization of intangible assets	$13	$14	'
Gross carrying amount	676	'	685
Accumulated amortization	-337	'	-332
Net carrying amount	339	'	353
Client Relationships [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Gross carrying amount	669	'	671
Accumulated amortization	-335	'	-326
Net carrying amount	334	'	345
Client Lists [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Gross carrying amount	3	'	3
Accumulated amortization	-1	'	-1
Net carrying amount	2	'	2
Non-compete Agreements [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Gross carrying amount	4	'	4
Accumulated amortization	-1	'	-1
Net carrying amount	3	'	3
Trade Names [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Gross carrying amount	0	'	2
Accumulated amortization	0	'	-1
Net carrying amount	0	'	1
Total Customer and Marketing Related [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Gross carrying amount	676	'	680
Accumulated amortization	-337	'	-329
Net carrying amount	339	'	351
Contract based, Technology and Other [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Gross carrying amount	0	'	5
Accumulated amortization	0	'	-3
Net carrying amount	$0	'	$2

OTHER_INTANGIBLE_ASSETS_NET_Ad

OTHER INTANGIBLE ASSETS, NET (Additional Information) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Intangible Assets, Net (Excluding Goodwill) [Abstract]	'	'
Amortization of intangible assets	$13	$14

OTHER_INTANGIBLE_ASSETS_NET_Es

OTHER INTANGIBLE ASSETS, NET (Estimated Aggregate Amortization) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Intangible Assets, Net (Excluding Goodwill) [Abstract]	'	'
Remainder of 2013	$37	'
2014	42	'
2015	37	'
2016	32	'
2017	29	'
Thereafter	162	'
Net carrying amount	$339	$353

OTHER_ASSETS_Details

OTHER ASSETS (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Other current assets	'	'
Prepayments and accrued income	$77	$73
Unamortized Cash Retention Awards	18	12
Income tax receivable	29	32
Deferred compensation plan asset current	26	26
Other Receivables, Net, Current	54	54
Total other current assets	204	197
Other non-current assets	'	'
Deferred compensation plan assets	88	88
Income Taxes Receivable, Noncurrent	22	21
Accounts Receivable, Net, Noncurrent	24	28
Other Investments	22	19
Other receivables	53	50
Total other non-current assets	209	206
Total other assets	$413	$403

OTHER_LIABILITIES_Details

OTHER LIABILITIES (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Other current liabilities	'	'
Accounts payable	$147	$123
Accrued dividends payable	55	51
Other taxes payable	118	51
Other payables	175	190
Total other current liabilities	495	415
Other non-current liabilities	'	'
Incentives from lessors	184	183
Deferred compensation plan liability	88	89
Income taxes payable	22	40
Other payables	60	62
Total other non-current liabilities	354	374
Total other liabilities	$849	$789

DEBT_Short_term_debt_and_curre

DEBT (Short term debt and current portion of long-term debt) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014
In Millions, unless otherwise specified			Seven Year Term Loan Facility [Member]	Term Loan Facility Expires 2016 [Member]	Revolving Credit Facility [Member]
Short-term Debt [Line Items]	'	'	'	'	'
Current portion of 7-year term loan facility expires 2016	'	'	$15	$15	'
Revolving credit facility outstanding balance at balance sheet date	'	'	'	'	0
Short-term debt and current portion of long-term debt	$15	$15	'	'	'
Maturity Period Of Term Loan	'	'	'7 years	'	'

DEBT_Longterm_debt_Details

DEBT (Long-term debt) (Details) (USD $)

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Aug. 15, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Aug. 15, 2013

Mar. 31, 2014

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Aug. 15, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Jul. 22, 2013

In Millions, unless otherwise specified

Term Loan Facility Expires Twenty Fifteen [Member]

Term Loan Facility Expires Twenty Fifteen [Member]

Four Point Six Two Five Senior Notes Due Two Thousand Twenty Three [Member]

Four Point Six Two Five Senior Notes Due Two Thousand Twenty Three [Member]

Four Point Six Two Five Senior Notes Due Two Thousand Twenty Three [Member]

Seven Year Term Loan Facility [Member]

Seven Year Term Loan Facility [Member]

Six Point One Two Five Senior Notes Due Two Thousand Forty Three [Member]

Six Point One Two Five Senior Notes Due Two Thousand Forty Three [Member]

Six Point One Two Five Senior Notes Due Two Thousand Forty Three [Member]

Five Point Six Two Five Senior Notes Due Two Thousand Fifteen [Member]

Five Point Seven Five Zero Senior Notes Due Two Thousand Twenty One [Member]

Five Point Seven Five Zero Senior Notes Due Two Thousand Twenty One [Member]

Seven Percentage Senior Notes Due Two Thousand Nineteen [Member]

Seven Percentage Senior Notes Due Two Thousand Nineteen [Member]

Six Point Two Percentage Senior Notes Due Two Thousand Seventeen [Member]

Six Point Two Percentage Senior Notes Due Two Thousand Seventeen [Member]

Four Point One Two Five Percent Senior Notes Due Two Thousand Sixteen [Member]

Four Point One Two Five Percent Senior Notes Due Two Thousand Sixteen [Member]

Fair Value Adjustment On Five Point Six Two Five Percentage Senior Notes Due Two Thousand Fifteen [Member]

Fair Value Adjustment On Five Point Six Two Five Percentage Senior Notes Due Two Thousand Fifteen [Member]

Fair Value Adjustment On Five Point Six Two Five Percentage Senior Notes Due Two Thousand Fifteen [Member]

Five Point Six Two Five Percent Senior Notes Due Two Thousand Fifteen [Member]

Five Point Six Two Five Percent Senior Notes Due Two Thousand Fifteen [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long term debt

'

'

$1

$1

'

'

'

$255

$259

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revolving credit facility

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

'

Senior Notes, Noncurrent

'

'

'

'

249

249

250

'

'

274

274

275

'

496

496

187

187

394

394

299

299

4

4

5

148

148

'

'

Revolving credit facilities available

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

800

500

Long-term debt, Total

$2,307

$2,311

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of loan notes

'

'

'

'

4.63%

'

'

'

'

6.13%

'

6.13%

4.63%

5.75%

5.75%

7.00%

7.00%

6.20%

6.20%

4.13%

4.13%

5.63%

5.63%

'

5.63%

5.63%

'

'

Debt Instrument, Maturity Date

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

23-Jul-18

'

Debt Instrument, Interest Rate, Effective Percentage

'

'

'

'

4.70%

'

'

'

'

6.15%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

DEBT_Additional_Information_De

DEBT (Additional Information) (Details) (USD $)

Mar. 31, 2014

Mar. 31, 2014

Apr. 28, 2014

Jul. 22, 2013

Mar. 31, 2014

Mar. 31, 2014

Jul. 22, 2013

Mar. 31, 2014

Dec. 31, 2013

Aug. 15, 2013

Mar. 31, 2014

Dec. 31, 2013

Aug. 15, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

In Millions, unless otherwise specified

Revolving Credit Facility Four [Member]

Revolving Credit Facility Four [Member]

Seven Year Term Loan Facility [Member]

Seven Year Term Loan Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Four Point Six Two Five Senior Notes Due Two Thousand Twenty Three [Member]

Four Point Six Two Five Senior Notes Due Two Thousand Twenty Three [Member]

Four Point Six Two Five Senior Notes Due Two Thousand Twenty Three [Member]

Six Point One Two Five Senior Notes Due Two Thousand Forty Three [Member]

Six Point One Two Five Senior Notes Due Two Thousand Forty Three [Member]

Six Point One Two Five Senior Notes Due Two Thousand Forty Three [Member]

Seven Year Term Loan Facility [Member]

Seven Year Term Loan Facility [Member]

Five Point Six Two Five Percent Senior Notes Due Two Thousand Fifteen [Member]

Five Point Six Two Five Percent Senior Notes Due Two Thousand Fifteen [Member]

Six Point Two Percentage Senior Notes Due Two Thousand Seventeen [Member]

Six Point Two Percentage Senior Notes Due Two Thousand Seventeen [Member]

Seven Percent Senior Notes Due Two Thousand Nineteen [Member]

Seven Percentage Senior Notes Due Two Thousand Nineteen [Member]

Seven Percentage Senior Notes Due Two Thousand Nineteen [Member]

Eurocurrency Rate Loans [Member]

Seven Year Term Loan Facility [Member]

Interest Rate Swaps [Member]

Variable based on LIBOR [Member]

Prime Rate [Member]

Federal Funds Purchased [Member]

Subsequent Event [Member]

Revolving Credit Facility Four [Member]

Revolving Credit Facility Four [Member]

Revolving Credit Facility Four [Member]

Revolving Credit Facility Four [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt 5-year term loan

'

'

'

'

'

'

'

'

'

'

'

'

'

$255

$259

'

'

'

'

'

'

'

'

'

'

'

'

'

Revolving credit facilities available

'

300

400

'

'

800

500

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Principal amount of specific notes tendered and accepted for purchase

525

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Early Repayment of Senior Debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

202

'

206

'

113

'

'

'

'

'

'

'

'

Final repayment for credit facility

'

'

'

'

186

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Interest Rate Description

'

'

'

'

'

'LIBOR plus 1.50%

'

'

'

'

'

'

'

'LIBOR plus 1.50%

'

'

'

'

'

'

'

'

'LIBOR plus 1.50% to 2.25%

'

'

'LIBOR plus 1.00%, plus 0.5% to 1.25%

' 'prime rate'

'Federal Funds rates plus 0.5%

Facility expiration date

'

3-Mar-15

'

16-Dec-16

23-Jul-18

23-Jul-18

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revolving credit facility outstanding balance at balance sheet date

'

0

'

'

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Outstanding Term Loan Facility Balance

'

'

'

'

270

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

300

'

'

'

'

Senior Notes, Noncurrent

'

'

'

'

'

'

'

249

249

250

274

274

275

'

'

148

148

394

394

'

187

187

'

'

'

'

'

'

Debt Instrument, Interest Rate, Stated Percentage

'

'

'

'

'

'

'

4.63%

'

'

6.13%

'

6.13%

'

'

5.63%

5.63%

6.20%

6.20%

'

7.00%

7.00%

'

'

'

'

'

'

Debt Instrument, Interest Rate, Effective Percentage

'

'

'

'

'

'

'

4.70%

'

'

6.15%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Write down of the fair value adjustment to the carrying value of senior notes in connection with interest rate swap

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$7

'

'

'

SUPPLEMENTAL_DISCLOSURES_OF_CA2

SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Supplemental Cash Flow Information [Abstract]	'	'
Cash payments for income taxes, net	$16	$10
Cash payments for interest	59	57
Fair value of assets acquired, net of cash acquired	0	3
Less: Fair value of liabilities assumed	0	-3
Net assets acquired, net of cash acquired	0	0
Interest Rate Swaps [Member]	'	'
Supplemental Cash Flow Information [Abstract]	'	'
Write down of the fair value adjustment to the carrying value of senior notes in connection with interest rate swap	$7	'

COMPREHENSIVE_INCOME_LOSS_Comp

COMPREHENSIVE INCOME (LOSS) (Components of OCI) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	$3	($74)
Tax on Foreign Currency Translation Adjustment	0	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	3	-74
Foreign Currency Translation on Pension Funding Adjustments, Before Tax	-5	53
Tax on Foreign Currency Translation on Pension Funding Adjustments	2	-13
Foreign Currency Translation on Pension Funding Adjustments, Net of Tax	-3	40
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	12	13
Tax on amortization of unrecognized actuarial loss	-2	-3
Amortization of unrecognized actuarial loss, Net of tax	10	10
Amortization of unrecognized prior service gain, before Tax	-1	-1
Tax on Amortization of unrecognized prior service gain	0	0
Amortization of unrecognized prior service gain, Net of Tax	-1	-1
Total Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	6	65
Pension and Other Postretirement Benefit Plans, Tax	0	-16
Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	6	49
Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	-1	'
Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	0	'
Derivatives Qualifying as Hedges, before Tax	-1	-16
Derivatives Qualifying as Hedges, Tax	0	4
Derivatives Qualifying as Hedges, Net of Tax	-1	-12
Other Comprehensive Income (Loss), before Tax	8	-25
Other comprehensive income, Tax	0	-12
Other Comprehensive Income (Loss), Net of Tax	8	-37
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Noncontrolling Interest	0	1
Other Comprehensive Income (Loss), Tax, Portion Attributable to Noncontrolling Interest	0	0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	0	1
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	8	-24
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	0	-12
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	8	-36
Interest Rate Swaps [Member]	'	'
Reclassification Adjustment on Derivatives Included in Net Income, before Tax	-2	-1
Reclassification Adjustment on Derivatives Included in Net Income, Tax	0	0
Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	-2	-1
Foreign Exchange Forward [Member]	'	'
Reclassification Adjustment on Derivatives Included in Net Income, before Tax	1	-2
Reclassification Adjustment on Derivatives Included in Net Income, Tax	0	1
Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	1	-1
Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	0	-13
Net gain (loss) on derivative instruments, tax	0	3
Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	$0	($10)

COMPREHENSIVE_INCOME_LOSS_Comp1

COMPREHENSIVE INCOME (LOSS) (Components of AOCI) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]	'	'	'
Foreign Currency Translation Adjustment in AOCI, Net of Tax	($11)	'	($14)
Pension and Other Postretirement Benefit Plans in AOCI, Net of Tax	-708	'	-714
Net unrealized gain on derivative instruments	34	'	35
Accumulated Other Comprehensive Income (Loss), Net of Tax	-685	'	-693
Foreign Currency Transaction and Translation Gain (Loss) IN AOCI Arising During Period, Net of Tax	3	'	'
Pension and Other Postretirement Benefit Plans, Adjustment in AOCI, before Reclassification Adjustments, Net of Tax	-3	'	'
Unrealized Gain (Loss) on Derivatives in AOCI Arising During Period, Net of Tax	0	'	'
Other Comprehensive Income (Loss), Before Reclassification Adjustments, Net of Tax	0	'	'
Reclassification Adjustment on Foreign Currency Transaction and Translation Gain Loss Included in Net Income, Net of Tax	0	'	'
Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Net of Tax	9	'	'
Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	-1	'	'
Other Comprehensive Income (Loss), Total Reclassification Adjustment on in Net Income, Net of Tax	8	7	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	3	-74	'
Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	6	49	'
Derivatives Qualifying as Hedges, Net of Tax	-1	-12	'
Other Comprehensive Income (Loss), Net of Tax	$8	($37)	'

COMPREHENSIVE_INCOME_LOSS_Recl

COMPREHENSIVE INCOME (LOSS) (Reclassifications from OCI) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	($1)	[1]	($3)	[1]
Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	-1		'
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	12		13
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Tax	-2		-3
Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Net of Tax	9		'
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	8		7
Interest Rate Swaps [Member]	'		'
Reclassification Adjustment on Derivatives Included in Net Income, before Tax	-2		-1
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	0		0
Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	-2		-1
Investment Income [Member] | Interest Rate Swaps [Member]	'		'
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	-2	[1]	-1	[1]
Operating Expense [Member] | Forward Exchange Contracts [Member]	'		'
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	1		-2	[1]
Cash Flow Hedges [Member]	'		'
Reclassification Adjustment on Derivatives Included in Net Income, before Tax	-1		-3
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	0		1
Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	-1		-2
Cash Flow Hedges [Member] | Investment Income [Member] | Interest Rate Swaps [Member]	'		'
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	-2		-1
Cash Flow Hedges [Member] | Operating Expense [Member] | Forward Exchange Contracts [Member]	'		'
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	1		-2
Pensions [Member]	'		'
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax	-1		-1
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	12		13
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax	11		12
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Tax	-2		-3
Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Net of Tax	$9		$9
[1]	Other Comprehensive Income

EQUITY_AND_NONCONTROLLING_INTE2

EQUITY AND NONCONTROLLING INTERESTS (Components of Equity) (Details) (USD $)	3 Months Ended
In Millions, except Share data, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013
Balance, beginning of period	$2,215		'
Net income attributable to Willis Group Holdings	246		219
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	8		-36
Comprehensive income	254		183
Dividends	-56		-48
Additional paid-in capital	62		33
Repurchase of shares	-35	[1]	0	[1]
Purchase of subsidiary shares from noncontrolling interests	0		-3
Balance, end of period	2,442		'
Balance, beginning of period, noncontrolling interest	28		'
Net Income (Loss) Attributable to Noncontrolling Interest	4		4
Other comprehensive income, net of tax, portion attributable to noncontrolling interest	0		-1
Comprehensive income attributable noncontrolling interest	4		3
Comprehensive income	258		186
Balance, end of period, noncontrolling interest	30		'
Balance, beginning of period, total	2,243		1,725
Net income	250		223
Other Comprehensive Income (Loss), Net of Tax	8		-37
Balance, end of period, total	2,472		1,893
Shares repurchased	825,000		'
Shares repurchased, average price	$42.40		'
Noncontrolling interests	'		'
Dividends	-2		-1
Additional paid-in capital	0		0
Repurchase of shares	0	[1]	0	[1]
Purchase of subsidiary shares from noncontrolling interests	0		0
Balance, beginning of period, noncontrolling interest	28		26
Net Income (Loss) Attributable to Noncontrolling Interest	4		4
Other comprehensive income, net of tax, portion attributable to noncontrolling interest	0		-1
Comprehensive income attributable noncontrolling interest	4		3
Balance, end of period, noncontrolling interest	30		28
Willis Group Holdings stockholders	'		'
Balance, beginning of period	2,215		1,699
Net income attributable to Willis Group Holdings	246		219
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	8		-36
Comprehensive income	254		183
Dividends	-54		-47
Additional paid-in capital	62		33
Repurchase of shares	-35	[1]	0	[1]
Purchase of subsidiary shares from noncontrolling interests	0		-3
Balance, end of period	$2,442		$1,865
[1]	Based on settlement date we repurchased 825,000 shares at an average price of $42.4 in the three months ended March 31, 2014.

EQUITY_AND_NONCONTROLLING_INTE3

EQUITY AND NONCONTROLLING INTERESTS (Effects of Changes in Ownership Interest in Subsidiaries) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Stockholders' Equity Note [Abstract]	'	'
Net income attributable to Willis Group Holdings	$246	$219
Decrease in Willis Group Holdings paid-in capital for purchase of noncontrolling interests	0	-3
Net transfers to noncontrolling interests	0	-3
Change from net income attributable to Willis Group Holdings and transfers from noncontrolling interests	$246	$216

SEGMENT_INFORMATION_Informatio

SEGMENT INFORMATION (Information Regarding Company's Segments) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013
Segment Reporting Information [Line Items]	'		'
Commissions and fees	$1,090		$1,046
Investment income	4		4
Other income	3		1
Total revenues	1,097		1,051
Depreciation and amortization	36		40
Operating income	326		281
Global	'		'
Segment Reporting Information [Line Items]	'		'
Commissions and fees	442		427
Investment income	2		1
Other income	2		0
Total revenues	446		428
Depreciation and amortization	9		7
Operating income	181		187
North America	'		'
Segment Reporting Information [Line Items]	'		'
Commissions and fees	369		355
Investment income	0		1
Other income	1		1
Total revenues	370		357
Depreciation and amortization	18		19
Operating income	96		82
International	'		'
Segment Reporting Information [Line Items]	'		'
Commissions and fees	279		264
Investment income	2		2
Other income	0		0
Total revenues	281		266
Depreciation and amortization	5		6
Operating income	84		78
Total Segments	'		'
Segment Reporting Information [Line Items]	'		'
Commissions and fees	1,090		1,046
Investment income	4		4
Other income	3		1
Total revenues	1,097		1,051
Depreciation and amortization	32		32
Operating income	361		347
Corporate	'		'
Segment Reporting Information [Line Items]	'		'
Commissions and fees	'		'
Investment income	'		'
Other income	'		'
Total revenues	'		'
Depreciation and amortization	4		8
Operating income	($35)	[1]	($66)	[1]
[1]	See the following table for an analysis of the ‘Corporate and Other’ line.

SEGMENT_INFORMATION_Corporate_

SEGMENT INFORMATION (Corporate and Other Information) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013
Segment Reporting Information [Line Items]	'		'
Costs Related to Group Functions	($44)		($26)
Litigation Settlement, Amount	-2		-3
Non-servicing Element of Defined Benefit Plan	13		10
Expense reduction initiative	0		-46
Operating income	326		281
Corporate	'		'
Segment Reporting Information [Line Items]	'		'
Operating income	-35	[1]	-66	[1]
Parent Company [Member]	'		'
Segment Reporting Information [Line Items]	'		'
Operating Expenses	-2		-1
Operating income	($4)		($1)
[1]	See the following table for an analysis of the ‘Corporate and Other’ line.

SEGMENT_INFORMATION_Consolidat

SEGMENT INFORMATION (Consolidated Operating Income) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting [Abstract]	'	'
Total consolidated operating income	$326	$281
Other income (expense), net	0	6
Interest expense	-32	-31
Income before income taxes and interest in earnings of associates	$294	$256

FINANCIAL_INFORMATION_FOR_PARE4

FINANCIAL INFORMATION FOR PARENT GUARANTOR, OTHER GUARANTOR SUBSIDIARIES AND NON-GUARANTOR SUBSIDIARIES (Details) (USD $)	Aug. 15, 2013	Sep. 29, 2009	Mar. 28, 2007	Jul. 01, 2005
In Millions, unless otherwise specified		Willis North America, Inc. [Member]	Willis North America, Inc. [Member]	Willis North America, Inc. [Member]
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Senior Notes	$525	'	'	'
Senior notes, outstanding balance	'	$187	$394	$148

FINANCIAL_INFORMATION_FOR_PARE5

FINANCIAL INFORMATION FOR PARENT GUARANTOR, OTHER GUARANTOR SUBSIDIARIES AND NON-GUARANTOR SUBSIDIARIES (Statement of Operations) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
REVENUES	'	'
Commissions and fees	$1,090	$1,046
Investment income	4	4
Other income	3	1
Total revenues	1,097	1,051
EXPENSES	'	'
Salaries and benefits	-570	-568
Other operating expenses	-165	-162
Depreciation expense	-23	-26
Amortization of intangible assets	-13	-14
Total expenses	-771	-770
Operating income	326	281
Other income (expense), net	0	6
Income from group undertakings	0	0
Investment income from Group undertakings	0	0
Interest expense	-32	-31
INCOME BEFORE INCOME TAXES AND INTEREST IN EARNINGS OF ASSOCIATES	294	256
Income taxes	-63	-48
Income Loss From Continuing Operations Before Interest In Earnings Of Associates	231	208
Interest in earnings of associates, net of tax	19	15
NET (LOSS) INCOME	250	223
Net Income (Loss) Attributable to Noncontrolling Interest	-4	-4
Equity account for subsidiaries	0	0
INCOME FROM CONTINUING OPERATIONS	250	'
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	246	219
Willis Group Holdings	'	'
REVENUES	'	'
Commissions and fees	0	0
Investment income	0	0
Other income	0	0
Total revenues	0	0
EXPENSES	'	'
Salaries and benefits	0	0
Other operating expenses	-4	-1
Depreciation expense	0	0
Amortization of intangible assets	0	0
Total expenses	-4	-1
Operating income	-4	-1
Other income (expense), net	0	-3
Income from group undertakings	0	0
Investment income from Group undertakings	0	0
Interest expense	-11	-11
INCOME BEFORE INCOME TAXES AND INTEREST IN EARNINGS OF ASSOCIATES	-15	-15
Income taxes	0	0
Income Loss From Continuing Operations Before Interest In Earnings Of Associates	-15	-15
Interest in earnings of associates, net of tax	0	0
NET (LOSS) INCOME	246	219
Net Income (Loss) Attributable to Noncontrolling Interest	0	0
Equity account for subsidiaries	261	234
INCOME FROM CONTINUING OPERATIONS	246	'
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	246	219
The Other Guarantors	'	'
REVENUES	'	'
Commissions and fees	0	0
Investment income	0	0
Other income	0	0
Total revenues	0	0
EXPENSES	'	'
Salaries and benefits	0	0
Other operating expenses	-24	-6
Depreciation expense	-1	0
Amortization of intangible assets	0	0
Total expenses	-25	-6
Operating income	-25	-6
Other income (expense), net	1	1
Income from group undertakings	59	44
Investment income from Group undertakings	-8	-8
Interest expense	-9	-2
INCOME BEFORE INCOME TAXES AND INTEREST IN EARNINGS OF ASSOCIATES	18	29
Income taxes	5	2
Income Loss From Continuing Operations Before Interest In Earnings Of Associates	23	31
Interest in earnings of associates, net of tax	3	2
NET (LOSS) INCOME	256	235
Net Income (Loss) Attributable to Noncontrolling Interest	0	0
Equity account for subsidiaries	230	202
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	256	235
The Issuer	'	'
REVENUES	'	'
Commissions and fees	2	0
Investment income	0	0
Other income	0	0
Total revenues	2	0
EXPENSES	'	'
Salaries and benefits	-19	-23
Other operating expenses	-17	-44
Depreciation expense	-4	-4
Amortization of intangible assets	0	0
Total expenses	-40	-71
Operating income	-38	-71
Other income (expense), net	0	0
Income from group undertakings	43	82
Investment income from Group undertakings	-46	-31
Interest expense	-11	-17
INCOME BEFORE INCOME TAXES AND INTEREST IN EARNINGS OF ASSOCIATES	-52	-37
Income taxes	19	0
Income Loss From Continuing Operations Before Interest In Earnings Of Associates	-33	-37
Interest in earnings of associates, net of tax	0	0
NET (LOSS) INCOME	50	36
Net Income (Loss) Attributable to Noncontrolling Interest	0	0
Equity account for subsidiaries	83	73
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	50	36
Other	'	'
REVENUES	'	'
Commissions and fees	1,088	1,046
Investment income	4	4
Other income	3	1
Total revenues	1,095	1,051
EXPENSES	'	'
Salaries and benefits	-551	-545
Other operating expenses	-120	-111
Depreciation expense	-18	-22
Amortization of intangible assets	-13	-14
Total expenses	-702	-692
Operating income	393	359
Other income (expense), net	-1	8
Income from group undertakings	27	21
Investment income from Group undertakings	-75	-108
Interest expense	-1	-1
INCOME BEFORE INCOME TAXES AND INTEREST IN EARNINGS OF ASSOCIATES	343	279
Income taxes	-87	-50
Income Loss From Continuing Operations Before Interest In Earnings Of Associates	256	229
Interest in earnings of associates, net of tax	16	13
NET (LOSS) INCOME	272	242
Net Income (Loss) Attributable to Noncontrolling Interest	-4	-4
Equity account for subsidiaries	0	0
INCOME FROM CONTINUING OPERATIONS	272	'
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	268	238
Consolidating adjustments	'	'
REVENUES	'	'
Commissions and fees	0	0
Investment income	0	0
Other income	0	0
Total revenues	0	0
EXPENSES	'	'
Salaries and benefits	0	0
Other operating expenses	0	0
Depreciation expense	0	0
Amortization of intangible assets	0	0
Total expenses	0	0
Operating income	0	0
Other income (expense), net	0	0
Income from group undertakings	-129	-147
Investment income from Group undertakings	129	147
Interest expense	0	0
INCOME BEFORE INCOME TAXES AND INTEREST IN EARNINGS OF ASSOCIATES	0	0
Income taxes	0	0
Income Loss From Continuing Operations Before Interest In Earnings Of Associates	0	0
Interest in earnings of associates, net of tax	0	0
NET (LOSS) INCOME	-574	-509
Net Income (Loss) Attributable to Noncontrolling Interest	0	0
Equity account for subsidiaries	-574	-509
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	-574	-509
Previously Reported	'	'
EXPENSES	'	'
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	219
Previously Reported | Willis Group Holdings	'	'
EXPENSES	'	'
Operating income	'	-4
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	219
Previously Reported | The Other Guarantors	'	'
EXPENSES	'	'
Operating income	'	-2
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	236
Previously Reported | The Issuer	'	'
EXPENSES	'	'
Operating income	'	-70
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	36
Previously Reported | Other	'	'
EXPENSES	'	'
Operating income	'	178
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	98
Previously Reported | Consolidating adjustments	'	'
EXPENSES	'	'
Operating income	'	185
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	-370
Restatement Adjustment	'	'
EXPENSES	'	'
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	0
Restatement Adjustment | Willis Group Holdings	'	'
EXPENSES	'	'
Operating income	'	3
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	0
Restatement Adjustment | The Other Guarantors	'	'
EXPENSES	'	'
Operating income	'	-4
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	-1
Restatement Adjustment | The Issuer	'	'
EXPENSES	'	'
Operating income	'	-1
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	0
Restatement Adjustment | Other	'	'
EXPENSES	'	'
Operating income	'	181
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	140
Restatement Adjustment | Consolidating adjustments	'	'
EXPENSES	'	'
Operating income	'	-185
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	($139)

FINANCIAL_INFORMATION_FOR_PARE6

FINANCIAL INFORMATION FOR PARENT GUARANTOR, OTHER GUARANTOR SUBSIDIARIES AND NON-GUARANTOR SUBSIDIARIES (Comprehensive Income) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Comprehensive income	$258	$186
Less: comprehensive income attributable to noncontrolling interests	-4	-3
Comprehensive income	254	183
Willis Group Holdings	'	'
Comprehensive income	254	183
Less: comprehensive income attributable to noncontrolling interests	0	0
Comprehensive income	254	183
The Other Guarantors	'	'
Comprehensive income	264	199
Less: comprehensive income attributable to noncontrolling interests	0	0
Comprehensive income	264	199
The Issuer	'	'
Comprehensive income	51	38
Less: comprehensive income attributable to noncontrolling interests	0	0
Comprehensive income	51	38
Other	'	'
Comprehensive income	281	203
Less: comprehensive income attributable to noncontrolling interests	-4	-3
Comprehensive income	277	200
Consolidating adjustments	'	'
Comprehensive income	-592	-437
Less: comprehensive income attributable to noncontrolling interests	0	0
Comprehensive income	-592	-437
Previously Reported | Willis Group Holdings	'	'
Comprehensive income	'	183
Previously Reported | The Other Guarantors	'	'
Comprehensive income	'	200
Previously Reported | The Issuer	'	'
Comprehensive income	'	38
Previously Reported | Other	'	'
Comprehensive income	'	60
Previously Reported | Consolidating adjustments	'	'
Comprehensive income	'	-298
Restatement Adjustment | Willis Group Holdings	'	'
Comprehensive income	'	0
Restatement Adjustment | The Other Guarantors	'	'
Comprehensive income	'	-1
Restatement Adjustment | The Issuer	'	'
Comprehensive income	'	0
Restatement Adjustment | Other	'	'
Comprehensive income	'	140
Restatement Adjustment | Consolidating adjustments	'	'
Comprehensive income	'	($139)

FINANCIAL_INFORMATION_FOR_PARE7

FINANCIAL INFORMATION FOR PARENT GUARANTOR, OTHER GUARANTOR SUBSIDIARIES AND NON-GUARANTOR SUBSIDIARIES (Balance Sheet) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
CURRENT ASSETS	'	'	'	'
Cash and cash equivalents	$734	$796	$531	$500
Accounts receivable, net	1,185	1,041	'	'
Fiduciary assets	9,306	8,412	'	'
Deferred tax assets	16	15	'	'
Other current assets	204	197	'	'
Amounts owed by group undertakings	0	0	'	'
Total current assets	11,445	10,461	'	'
Investments in subsidiaries	0	0	'	'
NON-CURRENT ASSETS	'	'	'	'
Fixed assets, net	482	481	'	'
Goodwill	2,835	2,838	'	2,827
Other intangible assets, net	339	353	'	'
Investments in associates	196	176	'	'
Deferred tax assets	6	7	'	'
Pension benefits asset	316	278	'	'
Other non-current assets	209	206	'	'
Non-current amounts due from group undertakings	0	0	'	'
Total non-current assets	4,383	4,339	'	'
TOTAL ASSETS	15,828	14,800	'	'
CURRENT LIABILITIES	'	'	'	'
Fiduciary liabilities	9,306	8,412	'	'
Deferred revenue and accrued expenses	371	586	'	'
Income taxes payable	53	21	'	'
Short-term debt and current portion of long-term debt	15	15	'	'
Deferred tax liabilities	36	25	'	'
Other current liabilities	495	415	'	'
Amounts due to group undertakings	0	0	'	'
Total current liabilities	10,276	9,474	'	'
Investments in subsidiaries	0	0	'	'
NON-CURRENT LIABILITIES	'	'	'	'
Long-term debt	2,307	2,311	'	'
Liabilities for pension benefits	130	136	'	'
Deferred tax liabilities	78	56	'	'
Provisions for liabilities	211	206	'	'
Other non-current liabilities	354	374	'	'
Noncurrent amounts due to group undertakings	0	0	'	'
Total non-current liabilities	3,080	3,083	'	'
Total liabilities	13,356	12,557	'	'
EQUITY	'	'	'	'
Total Willis Group Holdings stockholders’ equity	2,442	2,215	'	'
Noncontrolling interests	30	28	'	'
Total equity	2,472	2,243	1,893	1,725
TOTAL LIABILITIES AND EQUITY	15,828	14,800	'	'
Willis Group Holdings	'	'	'	'
CURRENT ASSETS	'	'	'	'
Cash and cash equivalents	3	3	1	1
Accounts receivable, net	1	0	'	'
Fiduciary assets	0	0	'	'
Deferred tax assets	0	0	'	'
Other current assets	1	1	'	'
Amounts owed by group undertakings	3,989	4,051	'	'
Total current assets	3,994	4,055	'	'
Investments in subsidiaries	0	0	'	'
NON-CURRENT ASSETS	'	'	'	'
Fixed assets, net	0	0	'	'
Goodwill	0	0	'	'
Other intangible assets, net	0	0	'	'
Investments in associates	0	0	'	'
Deferred tax assets	0	0	'	'
Pension benefits asset	0	0	'	'
Other non-current assets	3	4	'	'
Non-current amounts due from group undertakings	0	0	'	'
Total non-current assets	3	4	'	'
TOTAL ASSETS	3,997	4,059	'	'
CURRENT LIABILITIES	'	'	'	'
Fiduciary liabilities	0	0	'	'
Deferred revenue and accrued expenses	2	2	'	'
Income taxes payable	0	0	'	'
Short-term debt and current portion of long-term debt	0	0	'	'
Deferred tax liabilities	0	0	'	'
Other current liabilities	56	62	'	'
Amounts due to group undertakings	0	0	'	'
Total current liabilities	58	64	'	'
Investments in subsidiaries	702	985	'	'
NON-CURRENT LIABILITIES	'	'	'	'
Long-term debt	795	795	'	'
Liabilities for pension benefits	0	0	'	'
Deferred tax liabilities	0	0	'	'
Provisions for liabilities	0	0	'	'
Other non-current liabilities	0	0	'	'
Noncurrent amounts due to group undertakings	0	0	'	'
Total non-current liabilities	1,497	1,780	'	'
Total liabilities	1,555	1,844	'	'
EQUITY	'	'	'	'
Total Willis Group Holdings stockholders’ equity	2,442	2,215	'	'
Noncontrolling interests	0	0	'	'
Total equity	2,442	2,215	'	'
TOTAL LIABILITIES AND EQUITY	3,997	4,059	'	'
Guarantor Subsidiaries	'	'	'	'
CURRENT ASSETS	'	'	'	'
Cash and cash equivalents	3	3	2	0
Accounts receivable, net	4	4	'	'
Fiduciary assets	0	0	'	'
Deferred tax assets	0	0	'	'
Other current assets	53	31	'	'
Amounts owed by group undertakings	813	975	'	'
Total current assets	873	1,013	'	'
Investments in subsidiaries	4,089	3,788	'	'
NON-CURRENT ASSETS	'	'	'	'
Fixed assets, net	64	66	'	'
Goodwill	0	0	'	'
Other intangible assets, net	0	0	'	'
Investments in associates	160	156	'	'
Deferred tax assets	0	0	'	'
Pension benefits asset	0	0	'	'
Other non-current assets	15	14	'	'
Non-current amounts due from group undertakings	703	690	'	'
Total non-current assets	5,031	4,714	'	'
TOTAL ASSETS	5,904	5,727	'	'
CURRENT LIABILITIES	'	'	'	'
Fiduciary liabilities	0	0	'	'
Deferred revenue and accrued expenses	14	29	'	'
Income taxes payable	0	3	'	'
Short-term debt and current portion of long-term debt	15	15	'	'
Deferred tax liabilities	0	0	'	'
Other current liabilities	26	53	'	'
Amounts due to group undertakings	5,130	5,177	'	'
Total current liabilities	5,185	5,277	'	'
Investments in subsidiaries	0	0	'	'
NON-CURRENT LIABILITIES	'	'	'	'
Long-term debt	1,511	1,515	'	'
Liabilities for pension benefits	0	0	'	'
Deferred tax liabilities	1	1	'	'
Provisions for liabilities	3	0	'	'
Other non-current liabilities	41	48	'	'
Noncurrent amounts due to group undertakings	0	0	'	'
Total non-current liabilities	1,556	1,564	'	'
Total liabilities	6,741	6,841	'	'
EQUITY	'	'	'	'
Total Willis Group Holdings stockholders’ equity	-837	-1,114	'	'
Noncontrolling interests	0	0	'	'
Total equity	-837	-1,114	'	'
TOTAL LIABILITIES AND EQUITY	5,904	5,727	'	'
The Other Guarantors	'	'	'	'
CURRENT ASSETS	'	'	'	'
Cash and cash equivalents	3	3	2	0
Accounts receivable, net	0	0	'	'
Fiduciary assets	0	0	'	'
Deferred tax assets	0	0	'	'
Other current assets	25	21	'	'
Amounts owed by group undertakings	912	903	'	'
Total current assets	940	927	'	'
Investments in subsidiaries	3,090	2,838	'	'
NON-CURRENT ASSETS	'	'	'	'
Fixed assets, net	16	15	'	'
Goodwill	0	0	'	'
Other intangible assets, net	0	0	'	'
Investments in associates	160	156	'	'
Deferred tax assets	0	0	'	'
Pension benefits asset	0	0	'	'
Other non-current assets	9	9	'	'
Non-current amounts due from group undertakings	518	518	'	'
Total non-current assets	3,793	3,536	'	'
TOTAL ASSETS	4,733	4,463	'	'
CURRENT LIABILITIES	'	'	'	'
Fiduciary liabilities	0	0	'	'
Deferred revenue and accrued expenses	0	1	'	'
Income taxes payable	0	3	'	'
Short-term debt and current portion of long-term debt	15	15	'	'
Deferred tax liabilities	0	0	'	'
Other current liabilities	8	15	'	'
Amounts due to group undertakings	4,768	4,760	'	'
Total current liabilities	4,791	4,794	'	'
Investments in subsidiaries	0	0	'	'
NON-CURRENT LIABILITIES	'	'	'	'
Long-term debt	778	782	'	'
Liabilities for pension benefits	0	0	'	'
Deferred tax liabilities	1	1	'	'
Provisions for liabilities	0	0	'	'
Other non-current liabilities	0	0	'	'
Noncurrent amounts due to group undertakings	0	0	'	'
Total non-current liabilities	779	783	'	'
Total liabilities	5,570	5,577	'	'
EQUITY	'	'	'	'
Total Willis Group Holdings stockholders’ equity	-837	-1,114	'	'
Noncontrolling interests	0	0	'	'
Total equity	-837	-1,114	'	'
TOTAL LIABILITIES AND EQUITY	4,733	4,463	'	'
The Issuer	'	'	'	'
CURRENT ASSETS	'	'	'	'
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	4	4	'	'
Fiduciary assets	0	0	'	'
Deferred tax assets	0	0	'	'
Other current assets	28	10	'	'
Amounts owed by group undertakings	1,160	1,317	'	'
Total current assets	1,192	1,331	'	'
Investments in subsidiaries	1,124	1,021	'	'
NON-CURRENT ASSETS	'	'	'	'
Fixed assets, net	48	51	'	'
Goodwill	0	0	'	'
Other intangible assets, net	0	0	'	'
Investments in associates	0	0	'	'
Deferred tax assets	0	0	'	'
Pension benefits asset	0	0	'	'
Other non-current assets	6	5	'	'
Non-current amounts due from group undertakings	703	690	'	'
Total non-current assets	1,881	1,767	'	'
TOTAL ASSETS	3,073	3,098	'	'
CURRENT LIABILITIES	'	'	'	'
Fiduciary liabilities	0	0	'	'
Deferred revenue and accrued expenses	14	28	'	'
Income taxes payable	0	0	'	'
Short-term debt and current portion of long-term debt	0	0	'	'
Deferred tax liabilities	0	0	'	'
Other current liabilities	18	38	'	'
Amounts due to group undertakings	1,621	1,662	'	'
Total current liabilities	1,653	1,728	'	'
Investments in subsidiaries	0	0	'	'
NON-CURRENT LIABILITIES	'	'	'	'
Long-term debt	733	733	'	'
Liabilities for pension benefits	0	0	'	'
Deferred tax liabilities	0	0	'	'
Provisions for liabilities	3	0	'	'
Other non-current liabilities	41	48	'	'
Noncurrent amounts due to group undertakings	518	518	'	'
Total non-current liabilities	1,295	1,299	'	'
Total liabilities	2,948	3,027	'	'
EQUITY	'	'	'	'
Total Willis Group Holdings stockholders’ equity	125	71	'	'
Noncontrolling interests	0	0	'	'
Total equity	125	71	'	'
TOTAL LIABILITIES AND EQUITY	3,073	3,098	'	'
Other	'	'	'	'
CURRENT ASSETS	'	'	'	'
Cash and cash equivalents	728	790	528	499
Accounts receivable, net	1,180	1,037	'	'
Fiduciary assets	9,306	8,412	'	'
Deferred tax assets	16	16	'	'
Other current assets	183	186	'	'
Amounts owed by group undertakings	1,456	1,484	'	'
Total current assets	12,869	11,925	'	'
Investments in subsidiaries	0	0	'	'
NON-CURRENT ASSETS	'	'	'	'
Fixed assets, net	418	415	'	'
Goodwill	2,835	2,838	'	'
Other intangible assets, net	339	353	'	'
Investments in associates	36	20	'	'
Deferred tax assets	6	7	'	'
Pension benefits asset	316	278	'	'
Other non-current assets	191	188	'	'
Non-current amounts due from group undertakings	0	0	'	'
Total non-current assets	4,141	4,099	'	'
TOTAL ASSETS	17,010	16,024	'	'
CURRENT LIABILITIES	'	'	'	'
Fiduciary liabilities	9,306	8,412	'	'
Deferred revenue and accrued expenses	355	555	'	'
Income taxes payable	86	39	'	'
Short-term debt and current portion of long-term debt	0	0	'	'
Deferred tax liabilities	36	25	'	'
Other current liabilities	413	300	'	'
Amounts due to group undertakings	1,128	1,333	'	'
Total current liabilities	11,324	10,664	'	'
Investments in subsidiaries	0	0	'	'
NON-CURRENT LIABILITIES	'	'	'	'
Long-term debt	1	1	'	'
Liabilities for pension benefits	130	136	'	'
Deferred tax liabilities	77	55	'	'
Provisions for liabilities	208	206	'	'
Other non-current liabilities	313	326	'	'
Noncurrent amounts due to group undertakings	703	690	'	'
Total non-current liabilities	1,432	1,414	'	'
Total liabilities	12,756	12,078	'	'
EQUITY	'	'	'	'
Total Willis Group Holdings stockholders’ equity	4,224	3,918	'	'
Noncontrolling interests	30	28	'	'
Total equity	4,254	3,946	'	'
TOTAL LIABILITIES AND EQUITY	17,010	16,024	'	'
Consolidating adjustments	'	'	'	'
CURRENT ASSETS	'	'	'	'
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	0	0	'	'
Fiduciary assets	0	0	'	'
Deferred tax assets	0	-1	'	'
Other current assets	-33	-21	'	'
Amounts owed by group undertakings	-6,258	-6,510	'	'
Total current assets	-6,291	-6,532	'	'
Investments in subsidiaries	-4,089	-3,788	'	'
NON-CURRENT ASSETS	'	'	'	'
Fixed assets, net	0	0	'	'
Goodwill	0	0	'	'
Other intangible assets, net	0	0	'	'
Investments in associates	0	0	'	'
Deferred tax assets	0	0	'	'
Pension benefits asset	0	0	'	'
Other non-current assets	0	0	'	'
Non-current amounts due from group undertakings	-703	-690	'	'
Total non-current assets	-4,792	-4,478	'	'
TOTAL ASSETS	-11,083	-11,010	'	'
CURRENT LIABILITIES	'	'	'	'
Fiduciary liabilities	0	0	'	'
Deferred revenue and accrued expenses	0	0	'	'
Income taxes payable	-33	-21	'	'
Short-term debt and current portion of long-term debt	0	0	'	'
Deferred tax liabilities	0	0	'	'
Other current liabilities	0	0	'	'
Amounts due to group undertakings	-6,258	-6,510	'	'
Total current liabilities	-6,291	-6,531	'	'
Investments in subsidiaries	-702	-985	'	'
NON-CURRENT LIABILITIES	'	'	'	'
Long-term debt	0	0	'	'
Liabilities for pension benefits	0	0	'	'
Deferred tax liabilities	0	0	'	'
Provisions for liabilities	0	0	'	'
Other non-current liabilities	0	0	'	'
Noncurrent amounts due to group undertakings	-703	-690	'	'
Total non-current liabilities	-1,405	-1,675	'	'
Total liabilities	-7,696	-8,206	'	'
EQUITY	'	'	'	'
Total Willis Group Holdings stockholders’ equity	-3,387	-2,804	'	'
Noncontrolling interests	0	0	'	'
Total equity	-3,387	-2,804	'	'
TOTAL LIABILITIES AND EQUITY	-11,083	-11,010	'	'
Consolidating adjustments	'	'	'	'
CURRENT ASSETS	'	'	'	'
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	0	0	'	'
Fiduciary assets	0	0	'	'
Deferred tax assets	0	-1	'	'
Other current assets	-33	-21	'	'
Amounts owed by group undertakings	-7,517	-7,755	'	'
Total current assets	-7,550	-7,777	'	'
Investments in subsidiaries	-4,214	-3,859	'	'
NON-CURRENT ASSETS	'	'	'	'
Fixed assets, net	0	0	'	'
Goodwill	0	0	'	'
Other intangible assets, net	0	0	'	'
Investments in associates	0	0	'	'
Deferred tax assets	0	0	'	'
Pension benefits asset	0	0	'	'
Other non-current assets	0	0	'	'
Non-current amounts due from group undertakings	-1,221	-1,208	'	'
Total non-current assets	-5,435	-5,067	'	'
TOTAL ASSETS	-12,985	-12,844	'	'
CURRENT LIABILITIES	'	'	'	'
Fiduciary liabilities	0	0	'	'
Deferred revenue and accrued expenses	0	0	'	'
Income taxes payable	-33	-21	'	'
Short-term debt and current portion of long-term debt	0	0	'	'
Deferred tax liabilities	0	0	'	'
Other current liabilities	0	0	'	'
Amounts due to group undertakings	-7,517	-7,755	'	'
Total current liabilities	-7,550	-7,776	'	'
Investments in subsidiaries	-702	-985	'	'
NON-CURRENT LIABILITIES	'	'	'	'
Long-term debt	0	0	'	'
Liabilities for pension benefits	0	0	'	'
Deferred tax liabilities	0	0	'	'
Provisions for liabilities	0	0	'	'
Other non-current liabilities	0	0	'	'
Noncurrent amounts due to group undertakings	-1,221	-1,208	'	'
Total non-current liabilities	-1,923	-2,193	'	'
Total liabilities	-9,473	-9,969	'	'
EQUITY	'	'	'	'
Total Willis Group Holdings stockholders’ equity	-3,512	-2,875	'	'
Noncontrolling interests	0	0	'	'
Total equity	-3,512	-2,875	'	'
TOTAL LIABILITIES AND EQUITY	($12,985)	($12,844)	'	'

FINANCIAL_INFORMATION_FOR_PARE8

FINANCIAL INFORMATION FOR PARENT GUARANTOR, OTHER GUARANTOR SUBSIDIARIES AND NON-GUARANTOR SUBSIDIARIES (Cash Flows) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	$5	$39	'	'
CASH FLOWS FROM INVESTING ACTIVITIES	'	'	'	'
Proceeds on disposal of fixed and intangible assets	1	4	'	'
Additions to fixed assets	-22	-23	'	'
Payments to Acquire Intangible Assets	-1	0	'	'
Acquisitions of subsidiaries, net of cash acquired	0	-1	'	'
Payments to acquire other investments	-4	-1	'	'
Proceeds on sale of operations, net of cash disposed	5	0	'	'
Cash received on intercompany investing activities	0	0	'	'
Cash paid on intercompany investing activities	0	0	'	'
Net cash used in continuing investing activities	-21	-21	'	'
CASH FLOWS FROM FINANCING ACTIVITIES	'	'	'	'
Proceeds from draw down of revolving credit facility	'	55	'	'
Debt issuance costs	-2	0	'	'
Repayments of debt	-4	-4	'	'
Repurchase of shares	-35	'	'	'
Proceeds from issue of shares	43	19	'	'
Excess tax benefits from share-based payment arrangements	1	'	'	'
Dividends paid	-50	-47	'	'
Acquisition of noncontrolling interests	0	-4	'	'
Dividends paid to noncontrolling interests	-2	-1	'	'
Cash received on intercompany financing activities	0	0	'	'
Cash paid on intercompany financing activities	0	0	'	'
Net cash (used in) provided by continuing financing activities	-49	18	'	'
DECREASE IN CASH AND CASH EQUIVALENTS	-65	36	'	'
Effect of exchange rate changes on cash and cash equivalents	3	-5	'	'
Cash and cash equivalents	734	531	796	500
CASH AND CASH EQUIVALENTS, END OF PERIOD	734	531	796	500
Willis Group Holdings	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	-23	-23	'	'
CASH FLOWS FROM INVESTING ACTIVITIES	'	'	'	'
Proceeds on disposal of fixed and intangible assets	0	0	'	'
Additions to fixed assets	0	0	'	'
Payments to Acquire Intangible Assets	0	'	'	'
Acquisitions of subsidiaries, net of cash acquired	'	0	'	'
Payments to acquire other investments	0	0	'	'
Proceeds on sale of operations, net of cash disposed	0	'	'	'
Cash received on intercompany investing activities	65	180	'	'
Cash paid on intercompany investing activities	0	-129	'	'
Net cash used in continuing investing activities	65	51	'	'
CASH FLOWS FROM FINANCING ACTIVITIES	'	'	'	'
Proceeds from draw down of revolving credit facility	'	0	'	'
Debt issuance costs	0	'	'	'
Repayments of debt	0	0	'	'
Repurchase of shares	-35	'	'	'
Proceeds from issue of shares	43	19	'	'
Excess tax benefits from share-based payment arrangements	0	'	'	'
Dividends paid	-50	-47	'	'
Acquisition of noncontrolling interests	'	0	'	'
Dividends paid to noncontrolling interests	0	0	'	'
Cash received on intercompany financing activities	0	0	'	'
Cash paid on intercompany financing activities	0	0	'	'
Net cash (used in) provided by continuing financing activities	-42	-28	'	'
DECREASE IN CASH AND CASH EQUIVALENTS	0	0	'	'
Effect of exchange rate changes on cash and cash equivalents	0	0	'	'
Cash and cash equivalents	3	1	3	1
CASH AND CASH EQUIVALENTS, END OF PERIOD	3	1	3	1
Guarantor Subsidiaries	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	4	-246	'	'
CASH FLOWS FROM INVESTING ACTIVITIES	'	'	'	'
Proceeds on disposal of fixed and intangible assets	1	2	'	'
Additions to fixed assets	-4	-1	'	'
Payments to Acquire Intangible Assets	0	'	'	'
Acquisitions of subsidiaries, net of cash acquired	'	0	'	'
Payments to acquire other investments	0	0	'	'
Proceeds on sale of operations, net of cash disposed	0	'	'	'
Cash received on intercompany investing activities	120	141	'	'
Cash paid on intercompany investing activities	0	0	'	'
Net cash used in continuing investing activities	117	142	'	'
CASH FLOWS FROM FINANCING ACTIVITIES	'	'	'	'
Proceeds from draw down of revolving credit facility	'	55	'	'
Debt issuance costs	0	'	'	'
Repayments of debt	-4	-4	'	'
Repurchase of shares	0	'	'	'
Proceeds from issue of shares	0	0	'	'
Excess tax benefits from share-based payment arrangements	0	'	'	'
Dividends paid	0	0	'	'
Acquisition of noncontrolling interests	'	0	'	'
Dividends paid to noncontrolling interests	0	0	'	'
Cash received on intercompany financing activities	16	235	'	'
Cash paid on intercompany financing activities	-133	-180	'	'
Net cash (used in) provided by continuing financing activities	-121	106	'	'
DECREASE IN CASH AND CASH EQUIVALENTS	0	2	'	'
Effect of exchange rate changes on cash and cash equivalents	0	0	'	'
Cash and cash equivalents	3	2	3	0
CASH AND CASH EQUIVALENTS, END OF PERIOD	3	2	3	0
The Other Guarantors	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	25	-144	'	'
CASH FLOWS FROM INVESTING ACTIVITIES	'	'	'	'
Proceeds on disposal of fixed and intangible assets	0	0	'	'
Additions to fixed assets	-2	-1	'	'
Payments to Acquire Intangible Assets	0	'	'	'
Acquisitions of subsidiaries, net of cash acquired	'	0	'	'
Payments to acquire other investments	0	0	'	'
Proceeds on sale of operations, net of cash disposed	0	'	'	'
Cash received on intercompany investing activities	12	148	'	'
Cash paid on intercompany investing activities	0	0	'	'
Net cash used in continuing investing activities	10	147	'	'
CASH FLOWS FROM FINANCING ACTIVITIES	'	'	'	'
Proceeds from draw down of revolving credit facility	'	55	'	'
Debt issuance costs	0	'	'	'
Repayments of debt	-4	-4	'	'
Repurchase of shares	0	'	'	'
Proceeds from issue of shares	0	0	'	'
Excess tax benefits from share-based payment arrangements	0	'	'	'
Dividends paid	0	0	'	'
Acquisition of noncontrolling interests	'	0	'	'
Dividends paid to noncontrolling interests	0	0	'	'
Cash received on intercompany financing activities	16	128	'	'
Cash paid on intercompany financing activities	-47	-180	'	'
Net cash (used in) provided by continuing financing activities	-35	-1	'	'
DECREASE IN CASH AND CASH EQUIVALENTS	0	2	'	'
Effect of exchange rate changes on cash and cash equivalents	0	0	'	'
Cash and cash equivalents	3	2	3	0
CASH AND CASH EQUIVALENTS, END OF PERIOD	3	2	3	0
The Issuer	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	-21	-102	'	'
CASH FLOWS FROM INVESTING ACTIVITIES	'	'	'	'
Proceeds on disposal of fixed and intangible assets	1	2	'	'
Additions to fixed assets	-2	0	'	'
Payments to Acquire Intangible Assets	0	'	'	'
Acquisitions of subsidiaries, net of cash acquired	'	0	'	'
Payments to acquire other investments	0	0	'	'
Proceeds on sale of operations, net of cash disposed	0	'	'	'
Cash received on intercompany investing activities	120	10	'	'
Cash paid on intercompany investing activities	0	0	'	'
Net cash used in continuing investing activities	119	12	'	'
CASH FLOWS FROM FINANCING ACTIVITIES	'	'	'	'
Proceeds from draw down of revolving credit facility	'	0	'	'
Debt issuance costs	0	'	'	'
Repayments of debt	0	0	'	'
Repurchase of shares	0	'	'	'
Proceeds from issue of shares	0	0	'	'
Excess tax benefits from share-based payment arrangements	0	'	'	'
Dividends paid	0	0	'	'
Acquisition of noncontrolling interests	'	0	'	'
Dividends paid to noncontrolling interests	0	0	'	'
Cash received on intercompany financing activities	0	107	'	'
Cash paid on intercompany financing activities	-98	-17	'	'
Net cash (used in) provided by continuing financing activities	-98	90	'	'
DECREASE IN CASH AND CASH EQUIVALENTS	0	0	'	'
Effect of exchange rate changes on cash and cash equivalents	0	0	'	'
Cash and cash equivalents	0	0	0	0
CASH AND CASH EQUIVALENTS, END OF PERIOD	0	0	0	0
Other	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	25	308	'	'
CASH FLOWS FROM INVESTING ACTIVITIES	'	'	'	'
Proceeds on disposal of fixed and intangible assets	1	2	'	'
Additions to fixed assets	-19	-22	'	'
Payments to Acquire Intangible Assets	-1	'	'	'
Acquisitions of subsidiaries, net of cash acquired	'	-1	'	'
Payments to acquire other investments	-4	-1	'	'
Proceeds on sale of operations, net of cash disposed	5	'	'	'
Cash received on intercompany investing activities	115	0	'	'
Cash paid on intercompany investing activities	-16	-235	'	'
Net cash used in continuing investing activities	81	-257	'	'
CASH FLOWS FROM FINANCING ACTIVITIES	'	'	'	'
Proceeds from draw down of revolving credit facility	'	0	'	'
Debt issuance costs	-2	'	'	'
Repayments of debt	0	0	'	'
Repurchase of shares	0	'	'	'
Proceeds from issue of shares	0	0	'	'
Excess tax benefits from share-based payment arrangements	1	'	'	'
Dividends paid	-1	0	'	'
Acquisition of noncontrolling interests	'	-4	'	'
Dividends paid to noncontrolling interests	-2	-1	'	'
Cash received on intercompany financing activities	0	129	'	'
Cash paid on intercompany financing activities	-167	-141	'	'
Net cash (used in) provided by continuing financing activities	-171	-17	'	'
DECREASE IN CASH AND CASH EQUIVALENTS	-65	34	'	'
Effect of exchange rate changes on cash and cash equivalents	3	-5	'	'
Cash and cash equivalents	728	528	790	499
CASH AND CASH EQUIVALENTS, END OF PERIOD	728	528	790	499
Consolidating adjustments	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	-1	0	'	'
CASH FLOWS FROM INVESTING ACTIVITIES	'	'	'	'
Proceeds on disposal of fixed and intangible assets	-1	0	'	'
Additions to fixed assets	1	0	'	'
Payments to Acquire Intangible Assets	0	'	'	'
Acquisitions of subsidiaries, net of cash acquired	'	0	'	'
Payments to acquire other investments	0	0	'	'
Proceeds on sale of operations, net of cash disposed	0	'	'	'
Cash received on intercompany investing activities	-300	-321	'	'
Cash paid on intercompany investing activities	16	364	'	'
Net cash used in continuing investing activities	-284	43	'	'
CASH FLOWS FROM FINANCING ACTIVITIES	'	'	'	'
Proceeds from draw down of revolving credit facility	'	0	'	'
Debt issuance costs	0	'	'	'
Repayments of debt	0	0	'	'
Repurchase of shares	0	'	'	'
Proceeds from issue of shares	0	0	'	'
Excess tax benefits from share-based payment arrangements	0	'	'	'
Dividends paid	1	0	'	'
Acquisition of noncontrolling interests	'	0	'	'
Dividends paid to noncontrolling interests	0	0	'	'
Cash received on intercompany financing activities	-16	-364	'	'
Cash paid on intercompany financing activities	300	321	'	'
Net cash (used in) provided by continuing financing activities	285	-43	'	'
DECREASE IN CASH AND CASH EQUIVALENTS	0	0	'	'
Effect of exchange rate changes on cash and cash equivalents	0	0	'	'
Cash and cash equivalents	0	0	0	0
CASH AND CASH EQUIVALENTS, END OF PERIOD	0	0	0	0
Consolidating adjustments	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	-1	0	'	'
CASH FLOWS FROM INVESTING ACTIVITIES	'	'	'	'
Proceeds on disposal of fixed and intangible assets	-1	0	'	'
Additions to fixed assets	1	0	'	'
Payments to Acquire Intangible Assets	0	'	'	'
Acquisitions of subsidiaries, net of cash acquired	'	0	'	'
Payments to acquire other investments	0	0	'	'
Proceeds on sale of operations, net of cash disposed	0	'	'	'
Cash received on intercompany investing activities	-312	-338	'	'
Cash paid on intercompany investing activities	16	364	'	'
Net cash used in continuing investing activities	-296	26	'	'
CASH FLOWS FROM FINANCING ACTIVITIES	'	'	'	'
Proceeds from draw down of revolving credit facility	'	0	'	'
Debt issuance costs	0	'	'	'
Repayments of debt	0	0	'	'
Repurchase of shares	0	'	'	'
Proceeds from issue of shares	0	0	'	'
Excess tax benefits from share-based payment arrangements	0	'	'	'
Dividends paid	1	0	'	'
Acquisition of noncontrolling interests	'	0	'	'
Dividends paid to noncontrolling interests	0	0	'	'
Cash received on intercompany financing activities	-16	-364	'	'
Cash paid on intercompany financing activities	312	338	'	'
Net cash (used in) provided by continuing financing activities	297	-26	'	'
DECREASE IN CASH AND CASH EQUIVALENTS	0	0	'	'
Effect of exchange rate changes on cash and cash equivalents	0	0	'	'
Cash and cash equivalents	0	0	0	0
CASH AND CASH EQUIVALENTS, END OF PERIOD	0	0	0	0
Previously Reported | Willis Group Holdings	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	'	-25	'	'
CASH FLOWS FROM INVESTING ACTIVITIES	'	'	'	'
Net cash used in continuing investing activities	'	0	'	'
CASH FLOWS FROM FINANCING ACTIVITIES	'	'	'	'
Net cash (used in) provided by continuing financing activities	'	25	'	'
Previously Reported | Guarantor Subsidiaries	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	'	35	'	'
CASH FLOWS FROM INVESTING ACTIVITIES	'	'	'	'
Net cash used in continuing investing activities	'	1	'	'
CASH FLOWS FROM FINANCING ACTIVITIES	'	'	'	'
Net cash (used in) provided by continuing financing activities	'	-34	'	'
Previously Reported | The Other Guarantors	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	'	27	'	'
CASH FLOWS FROM INVESTING ACTIVITIES	'	'	'	'
Net cash used in continuing investing activities	'	-1	'	'
CASH FLOWS FROM FINANCING ACTIVITIES	'	'	'	'
Net cash (used in) provided by continuing financing activities	'	-24	'	'
Previously Reported | The Issuer	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	'	8	'	'
CASH FLOWS FROM INVESTING ACTIVITIES	'	'	'	'
Net cash used in continuing investing activities	'	2	'	'
CASH FLOWS FROM FINANCING ACTIVITIES	'	'	'	'
Net cash (used in) provided by continuing financing activities	'	-10	'	'
Previously Reported | Other	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	'	29	'	'
CASH FLOWS FROM INVESTING ACTIVITIES	'	'	'	'
Net cash used in continuing investing activities	'	-22	'	'
CASH FLOWS FROM FINANCING ACTIVITIES	'	'	'	'
Net cash (used in) provided by continuing financing activities	'	27	'	'
Previously Reported | Consolidating adjustments	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	'	0	'	'
CASH FLOWS FROM INVESTING ACTIVITIES	'	'	'	'
Net cash used in continuing investing activities	'	0	'	'
CASH FLOWS FROM FINANCING ACTIVITIES	'	'	'	'
Net cash (used in) provided by continuing financing activities	'	0	'	'
Previously Reported | Consolidating adjustments	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	'	0	'	'
CASH FLOWS FROM INVESTING ACTIVITIES	'	'	'	'
Net cash used in continuing investing activities	'	0	'	'
CASH FLOWS FROM FINANCING ACTIVITIES	'	'	'	'
Net cash (used in) provided by continuing financing activities	'	0	'	'
Restatement Adjustment | Willis Group Holdings	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	'	2	'	'
CASH FLOWS FROM INVESTING ACTIVITIES	'	'	'	'
Net cash used in continuing investing activities	'	51	'	'
CASH FLOWS FROM FINANCING ACTIVITIES	'	'	'	'
Net cash (used in) provided by continuing financing activities	'	-53	'	'
Restatement Adjustment | Guarantor Subsidiaries	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	'	-281	'	'
CASH FLOWS FROM INVESTING ACTIVITIES	'	'	'	'
Net cash used in continuing investing activities	'	141	'	'
CASH FLOWS FROM FINANCING ACTIVITIES	'	'	'	'
Net cash (used in) provided by continuing financing activities	'	140	'	'
Restatement Adjustment | The Other Guarantors	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	'	-171	'	'
CASH FLOWS FROM INVESTING ACTIVITIES	'	'	'	'
Net cash used in continuing investing activities	'	148	'	'
CASH FLOWS FROM FINANCING ACTIVITIES	'	'	'	'
Net cash (used in) provided by continuing financing activities	'	23	'	'
Restatement Adjustment | The Issuer	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	'	-110	'	'
CASH FLOWS FROM INVESTING ACTIVITIES	'	'	'	'
Net cash used in continuing investing activities	'	10	'	'
CASH FLOWS FROM FINANCING ACTIVITIES	'	'	'	'
Net cash (used in) provided by continuing financing activities	'	100	'	'
Restatement Adjustment | Other	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	'	279	'	'
CASH FLOWS FROM INVESTING ACTIVITIES	'	'	'	'
Net cash used in continuing investing activities	'	-235	'	'
CASH FLOWS FROM FINANCING ACTIVITIES	'	'	'	'
Net cash (used in) provided by continuing financing activities	'	-44	'	'
Restatement Adjustment | Consolidating adjustments	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	'	0	'	'
CASH FLOWS FROM INVESTING ACTIVITIES	'	'	'	'
Net cash used in continuing investing activities	'	43	'	'
CASH FLOWS FROM FINANCING ACTIVITIES	'	'	'	'
Net cash (used in) provided by continuing financing activities	'	-43	'	'
Restatement Adjustment | Consolidating adjustments	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	'	0	'	'
CASH FLOWS FROM INVESTING ACTIVITIES	'	'	'	'
Net cash used in continuing investing activities	'	26	'	'
CASH FLOWS FROM FINANCING ACTIVITIES	'	'	'	'
Net cash (used in) provided by continuing financing activities	'	($26)	'	'

FINANCIAL_INFORMATION_FOR_PARE9

FINANCIAL INFORMATION FOR PARENT ISSUER, GUARANTOR SUBSIDIARIES AND NON-GUARANTOR SUBSIDIARIES (Details) (USD $)	0 Months Ended
In Millions, unless otherwise specified	Mar. 17, 2011
Condensed Financial Information of Parent Company Only Disclosure [Abstract]	'
Senior notes issued	$800

Recovered_Sheet1

FINANCIAL INFORMATION FOR PARENT ISSUER, GUARANTOR SUBSIDIARIES AND NON-GUARANTOR SUBSIDIARIES (Statement of Operations) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Commissions and fees	$1,090	$1,046
Investment income	4	4
Other income	3	1
Total revenues	1,097	1,051
Labor and Related Expense	-570	-568
Other Cost and Expense, Operating	-165	-162
Depreciation expense	-23	-26
Amortization of intangible assets	-13	-14
Operating Expenses	-771	-770
Operating Income (Loss)	326	281
Other income (expense), net	0	6
Income from group undertakings	0	0
Expenses due to group undertakings	0	0
Interest Expense	-32	-31
Income before income taxes and interest in earnings of associates	294	256
Income Tax Expense (Benefit)	-63	-48
Income Loss From Continuing Operations Before Interest In Earnings Of Associates	231	208
Interest in earnings of associates, net of tax	19	15
Equity account for subsidiaries	0	0
INCOME FROM CONTINUING OPERATIONS	250	'
NET (LOSS) INCOME	250	223
Net Income (Loss) Attributable to Noncontrolling Interest	-4	-4
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	246	219
Guarantor Subsidiaries	'	'
Commissions and fees	2	0
Investment income	0	0
Other income	0	0
Total revenues	2	0
Labor and Related Expense	-19	-23
Other Cost and Expense, Operating	-41	-50
Depreciation expense	-5	-4
Amortization of intangible assets	0	0
Operating Expenses	-65	-77
Operating Income (Loss)	-63	-77
Other income (expense), net	1	1
Income from group undertakings	75	108
Expenses due to group undertakings	-27	-21
Interest Expense	-20	-19
Income before income taxes and interest in earnings of associates	-34	-8
Income Tax Expense (Benefit)	24	2
Income Loss From Continuing Operations Before Interest In Earnings Of Associates	-10	-6
Interest in earnings of associates, net of tax	3	2
Equity account for subsidiaries	263	239
NET (LOSS) INCOME	256	235
Net Income (Loss) Attributable to Noncontrolling Interest	0	0
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	256	235
Other	'	'
Commissions and fees	1,088	1,046
Investment income	4	4
Other income	3	1
Total revenues	1,095	1,051
Labor and Related Expense	-551	-545
Other Cost and Expense, Operating	-120	-111
Depreciation expense	-18	-22
Amortization of intangible assets	-13	-14
Operating Expenses	-702	-692
Operating Income (Loss)	393	359
Other income (expense), net	-1	8
Income from group undertakings	27	21
Expenses due to group undertakings	-75	-108
Interest Expense	-1	-1
Income before income taxes and interest in earnings of associates	343	279
Income Tax Expense (Benefit)	-87	-50
Income Loss From Continuing Operations Before Interest In Earnings Of Associates	256	229
Interest in earnings of associates, net of tax	16	13
Equity account for subsidiaries	0	0
INCOME FROM CONTINUING OPERATIONS	272	'
NET (LOSS) INCOME	272	242
Net Income (Loss) Attributable to Noncontrolling Interest	-4	-4
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	268	238
Consolidating adjustments	'	'
Commissions and fees	0	0
Investment income	0	0
Other income	0	0
Total revenues	0	0
Labor and Related Expense	0	0
Other Cost and Expense, Operating	0	0
Depreciation expense	0	0
Amortization of intangible assets	0	0
Operating Expenses	0	0
Operating Income (Loss)	0	0
Other income (expense), net	0	0
Income from group undertakings	-102	-129
Expenses due to group undertakings	102	129
Interest Expense	0	0
Income before income taxes and interest in earnings of associates	0	0
Income Tax Expense (Benefit)	0	0
Income Loss From Continuing Operations Before Interest In Earnings Of Associates	0	0
Interest in earnings of associates, net of tax	0	0
Equity account for subsidiaries	-524	-473
NET (LOSS) INCOME	-524	-473
Net Income (Loss) Attributable to Noncontrolling Interest	0	0
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	-524	-473
Willis Group Holdings	'	'
Commissions and fees	0	0
Investment income	0	0
Other income	0	0
Total revenues	0	0
Labor and Related Expense	0	0
Other Cost and Expense, Operating	-4	-1
Depreciation expense	0	0
Amortization of intangible assets	0	0
Operating Expenses	-4	-1
Operating Income (Loss)	-4	-1
Other income (expense), net	0	-3
Income from group undertakings	0	0
Expenses due to group undertakings	0	0
Interest Expense	-11	-11
Income before income taxes and interest in earnings of associates	-15	-15
Income Tax Expense (Benefit)	0	0
Income Loss From Continuing Operations Before Interest In Earnings Of Associates	-15	-15
Interest in earnings of associates, net of tax	0	0
Equity account for subsidiaries	261	234
INCOME FROM CONTINUING OPERATIONS	246	'
NET (LOSS) INCOME	246	219
Net Income (Loss) Attributable to Noncontrolling Interest	0	0
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	246	219
Previously Reported	'	'
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	219
Previously Reported | Guarantor Subsidiaries	'	'
Operating Income (Loss)	'	-72
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	236
Previously Reported | Other	'	'
Operating Income (Loss)	'	178
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	98
Previously Reported | Consolidating adjustments	'	'
Operating Income (Loss)	'	185
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	-334
Previously Reported | Willis Group Holdings	'	'
Operating Income (Loss)	'	-4
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	219
Restatement Adjustment	'	'
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	0
Restatement Adjustment | Guarantor Subsidiaries	'	'
Operating Income (Loss)	'	-5
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	-1
Restatement Adjustment | Other	'	'
Operating Income (Loss)	'	181
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	140
Restatement Adjustment | Consolidating adjustments	'	'
Operating Income (Loss)	'	-185
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	-139
Restatement Adjustment | Willis Group Holdings	'	'
Operating Income (Loss)	'	3
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	$0

Recovered_Sheet2

FINANCIAL INFORMATION FOR PARENT ISSUER, GUARANTOR SUBSIDIARIES AND NON-GUARANTOR SUBSIDIARIES (Comprehensive Income) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Condensed Financial Statements, Captions [Line Items]	'	'
Comprehensive income	$258	$186
Less: comprehensive income attributable to noncontrolling interests	-4	-3
Comprehensive income	254	183
Willis Group Holdings	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Comprehensive income	254	183
Less: comprehensive income attributable to noncontrolling interests	0	0
Comprehensive income	254	183
Guarantor Subsidiaries	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Comprehensive income	264	199
Less: comprehensive income attributable to noncontrolling interests	0	0
Comprehensive income	264	199
Other	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Comprehensive income	281	203
Less: comprehensive income attributable to noncontrolling interests	-4	-3
Comprehensive income	277	200
Consolidating adjustments	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Comprehensive income	-541	-399
Less: comprehensive income attributable to noncontrolling interests	0	0
Comprehensive income	-541	-399
Previously Reported | Willis Group Holdings	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Comprehensive income	'	183
Previously Reported | Guarantor Subsidiaries	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Comprehensive income	'	200
Previously Reported | Other	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Comprehensive income	'	60
Previously Reported | Consolidating adjustments	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Comprehensive income	'	-260
Restatement Adjustment | Willis Group Holdings	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Comprehensive income	'	0
Restatement Adjustment | Guarantor Subsidiaries	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Comprehensive income	'	-1
Restatement Adjustment | Other	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Comprehensive income	'	140
Restatement Adjustment | Consolidating adjustments	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Comprehensive income	'	($139)

Recovered_Sheet3

FINANCIAL INFORMATION FOR PARENT ISSUER, GUARANTOR SUBSIDIARIES AND NON-GUARANTOR SUBSIDIARIES (Balance Sheet) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
CURRENT ASSETS	'	'	'	'
Cash and cash equivalents	$734	$796	$531	$500
Accounts receivable, net	1,185	1,041	'	'
Fiduciary assets	9,306	8,412	'	'
Deferred tax assets	16	15	'	'
Other current assets	204	197	'	'
Amounts due from group undertakings	0	0	'	'
Total current assets	11,445	10,461	'	'
NON-CURRENT ASSETS	'	'	'	'
Investments in subsidiaries	0	0	'	'
Fixed assets, net	482	481	'	'
Goodwill	2,835	2,838	'	2,827
Other intangible assets, net	339	353	'	'
Investments in associates	196	176	'	'
Deferred tax assets	6	7	'	'
Pension benefits asset	316	278	'	'
Other non-current assets	209	206	'	'
Non-current amounts due from group undertakings	0	0	'	'
Total non-current assets	4,383	4,339	'	'
TOTAL ASSETS	15,828	14,800	'	'
CURRENT LIABILITIES	'	'	'	'
Fiduciary liabilities	9,306	8,412	'	'
Deferred revenue and accrued expenses	371	586	'	'
Income taxes payable	53	21	'	'
Short-term debt and current portion of long-term debt	15	15	'	'
Deferred tax liabilities	36	25	'	'
Other current liabilities	495	415	'	'
Amounts due to group undertakings	0	0	'	'
Total current liabilities	10,276	9,474	'	'
NON-CURRENT LIABILITIES	'	'	'	'
Investments in subsidiaries	0	0	'	'
Long-term debt	2,307	2,311	'	'
Liabilities for pension benefits	130	136	'	'
Deferred tax liabilities	78	56	'	'
Provisions for liabilities	211	206	'	'
Other non-current liabilities	354	374	'	'
Total non-current liabilities	3,080	3,083	'	'
Total liabilities	13,356	12,557	'	'
EQUITY	'	'	'	'
Total Willis Group Holdings stockholders’ equity	2,442	2,215	'	'
Noncontrolling interests	30	28	'	'
Total equity	2,472	2,243	1,893	1,725
TOTAL LIABILITIES AND EQUITY	15,828	14,800	'	'
Willis Group Holdings	'	'	'	'
CURRENT ASSETS	'	'	'	'
Cash and cash equivalents	3	3	1	1
Accounts receivable, net	1	0	'	'
Fiduciary assets	0	0	'	'
Deferred tax assets	0	0	'	'
Other current assets	1	1	'	'
Amounts due from group undertakings	3,989	4,051	'	'
Total current assets	3,994	4,055	'	'
NON-CURRENT ASSETS	'	'	'	'
Investments in subsidiaries	0	0	'	'
Fixed assets, net	0	0	'	'
Goodwill	0	0	'	'
Other intangible assets, net	0	0	'	'
Investments in associates	0	0	'	'
Deferred tax assets	0	0	'	'
Pension benefits asset	0	0	'	'
Other non-current assets	3	4	'	'
Non-current amounts due from group undertakings	0	0	'	'
Total non-current assets	3	4	'	'
TOTAL ASSETS	3,997	4,059	'	'
CURRENT LIABILITIES	'	'	'	'
Fiduciary liabilities	0	0	'	'
Deferred revenue and accrued expenses	2	2	'	'
Income taxes payable	0	0	'	'
Short-term debt and current portion of long-term debt	0	0	'	'
Deferred tax liabilities	0	0	'	'
Other current liabilities	56	62	'	'
Amounts due to group undertakings	0	0	'	'
Total current liabilities	58	64	'	'
NON-CURRENT LIABILITIES	'	'	'	'
Investments in subsidiaries	702	985	'	'
Long-term debt	795	795	'	'
Liabilities for pension benefits	0	0	'	'
Deferred tax liabilities	0	0	'	'
Provisions for liabilities	0	0	'	'
Other non-current liabilities	0	0	'	'
Total non-current liabilities	1,497	1,780	'	'
Total liabilities	1,555	1,844	'	'
EQUITY	'	'	'	'
Total Willis Group Holdings stockholders’ equity	2,442	2,215	'	'
Noncontrolling interests	0	0	'	'
Total equity	2,442	2,215	'	'
TOTAL LIABILITIES AND EQUITY	3,997	4,059	'	'
Guarantor Subsidiaries	'	'	'	'
CURRENT ASSETS	'	'	'	'
Cash and cash equivalents	3	3	2	0
Accounts receivable, net	4	4	'	'
Fiduciary assets	0	0	'	'
Deferred tax assets	0	0	'	'
Other current assets	53	31	'	'
Amounts due from group undertakings	813	975	'	'
Total current assets	873	1,013	'	'
NON-CURRENT ASSETS	'	'	'	'
Investments in subsidiaries	4,089	3,788	'	'
Fixed assets, net	64	66	'	'
Goodwill	0	0	'	'
Other intangible assets, net	0	0	'	'
Investments in associates	160	156	'	'
Deferred tax assets	0	0	'	'
Pension benefits asset	0	0	'	'
Other non-current assets	15	14	'	'
Non-current amounts due from group undertakings	703	690	'	'
Total non-current assets	5,031	4,714	'	'
TOTAL ASSETS	5,904	5,727	'	'
CURRENT LIABILITIES	'	'	'	'
Fiduciary liabilities	0	0	'	'
Deferred revenue and accrued expenses	14	29	'	'
Income taxes payable	0	3	'	'
Short-term debt and current portion of long-term debt	15	15	'	'
Deferred tax liabilities	0	0	'	'
Other current liabilities	26	53	'	'
Amounts due to group undertakings	5,130	5,177	'	'
Total current liabilities	5,185	5,277	'	'
NON-CURRENT LIABILITIES	'	'	'	'
Investments in subsidiaries	0	0	'	'
Long-term debt	1,511	1,515	'	'
Liabilities for pension benefits	0	0	'	'
Deferred tax liabilities	1	1	'	'
Provisions for liabilities	3	0	'	'
Other non-current liabilities	41	48	'	'
Total non-current liabilities	1,556	1,564	'	'
Total liabilities	6,741	6,841	'	'
EQUITY	'	'	'	'
Total Willis Group Holdings stockholders’ equity	-837	-1,114	'	'
Noncontrolling interests	0	0	'	'
Total equity	-837	-1,114	'	'
TOTAL LIABILITIES AND EQUITY	5,904	5,727	'	'
Other	'	'	'	'
CURRENT ASSETS	'	'	'	'
Cash and cash equivalents	728	790	528	499
Accounts receivable, net	1,180	1,037	'	'
Fiduciary assets	9,306	8,412	'	'
Deferred tax assets	16	16	'	'
Other current assets	183	186	'	'
Amounts due from group undertakings	1,456	1,484	'	'
Total current assets	12,869	11,925	'	'
NON-CURRENT ASSETS	'	'	'	'
Investments in subsidiaries	0	0	'	'
Fixed assets, net	418	415	'	'
Goodwill	2,835	2,838	'	'
Other intangible assets, net	339	353	'	'
Investments in associates	36	20	'	'
Deferred tax assets	6	7	'	'
Pension benefits asset	316	278	'	'
Other non-current assets	191	188	'	'
Non-current amounts due from group undertakings	0	0	'	'
Total non-current assets	4,141	4,099	'	'
TOTAL ASSETS	17,010	16,024	'	'
CURRENT LIABILITIES	'	'	'	'
Fiduciary liabilities	9,306	8,412	'	'
Deferred revenue and accrued expenses	355	555	'	'
Income taxes payable	86	39	'	'
Short-term debt and current portion of long-term debt	0	0	'	'
Deferred tax liabilities	36	25	'	'
Other current liabilities	413	300	'	'
Amounts due to group undertakings	1,128	1,333	'	'
Total current liabilities	11,324	10,664	'	'
NON-CURRENT LIABILITIES	'	'	'	'
Investments in subsidiaries	0	0	'	'
Long-term debt	1	1	'	'
Liabilities for pension benefits	130	136	'	'
Deferred tax liabilities	77	55	'	'
Provisions for liabilities	208	206	'	'
Other non-current liabilities	313	326	'	'
Total non-current liabilities	1,432	1,414	'	'
Total liabilities	12,756	12,078	'	'
EQUITY	'	'	'	'
Total Willis Group Holdings stockholders’ equity	4,224	3,918	'	'
Noncontrolling interests	30	28	'	'
Total equity	4,254	3,946	'	'
TOTAL LIABILITIES AND EQUITY	17,010	16,024	'	'
Consolidating adjustments	'	'	'	'
CURRENT ASSETS	'	'	'	'
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	0	0	'	'
Fiduciary assets	0	0	'	'
Deferred tax assets	0	-1	'	'
Other current assets	-33	-21	'	'
Amounts due from group undertakings	-6,258	-6,510	'	'
Total current assets	-6,291	-6,532	'	'
NON-CURRENT ASSETS	'	'	'	'
Investments in subsidiaries	-4,089	-3,788	'	'
Fixed assets, net	0	0	'	'
Goodwill	0	0	'	'
Other intangible assets, net	0	0	'	'
Investments in associates	0	0	'	'
Deferred tax assets	0	0	'	'
Pension benefits asset	0	0	'	'
Other non-current assets	0	0	'	'
Non-current amounts due from group undertakings	-703	-690	'	'
Total non-current assets	-4,792	-4,478	'	'
TOTAL ASSETS	-11,083	-11,010	'	'
CURRENT LIABILITIES	'	'	'	'
Fiduciary liabilities	0	0	'	'
Deferred revenue and accrued expenses	0	0	'	'
Income taxes payable	-33	-21	'	'
Short-term debt and current portion of long-term debt	0	0	'	'
Deferred tax liabilities	0	0	'	'
Other current liabilities	0	0	'	'
Amounts due to group undertakings	-6,258	-6,510	'	'
Total current liabilities	-6,291	-6,531	'	'
NON-CURRENT LIABILITIES	'	'	'	'
Investments in subsidiaries	-702	-985	'	'
Long-term debt	0	0	'	'
Liabilities for pension benefits	0	0	'	'
Deferred tax liabilities	0	0	'	'
Provisions for liabilities	0	0	'	'
Other non-current liabilities	0	0	'	'
Total non-current liabilities	-1,405	-1,675	'	'
Total liabilities	-7,696	-8,206	'	'
EQUITY	'	'	'	'
Total Willis Group Holdings stockholders’ equity	-3,387	-2,804	'	'
Noncontrolling interests	0	0	'	'
Total equity	-3,387	-2,804	'	'
TOTAL LIABILITIES AND EQUITY	($11,083)	($11,010)	'	'

Recovered_Sheet4

FINANCIAL INFORMATION FOR PARENT ISSUER, GUARANTOR SUBSIDIARIES AND NON-GUARANTOR SUBSIDIARIES (Cash Flows) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Condensed Financial Statements, Captions [Line Items]	'	'
Net Cash Provided by (Used in) Operating Activities	$5	$39
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Proceeds on disposal of fixed and intangible assets	1	4
Additions to fixed assets	-22	-23
Payments to Acquire Intangible Assets	-1	0
Acquisitions of subsidiaries, net of cash acquired	0	-1
Payments to acquire other investments	-4	-1
Proceeds on sale of operations, net of cash disposed	5	0
Cash received on intercompany investing activities	0	0
Cash paid on intercompany investing activities	0	0
Net cash used in continuing investing activities	-21	-21
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Proceeds from draw down of revolving credit facility	'	55
Debt issuance costs	-2	0
Repayments of debt	-4	-4
Repurchase of shares	-35	'
Proceeds from issue of shares	43	19
Excess tax benefits from share-based payment arrangements	1	'
Dividends paid	-50	-47
Acquisition of noncontrolling interests	0	-4
Dividends paid to noncontrolling interests	-2	-1
Cash received on intercompany financing activities	0	0
Cash paid on intercompany financing activities	0	0
Net cash (used in) provided by continuing financing activities	-49	18
DECREASE IN CASH AND CASH EQUIVALENTS	-65	36
Effect of exchange rate changes on cash and cash equivalents	3	-5
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	796	500
CASH AND CASH EQUIVALENTS, END OF PERIOD	734	531
Willis Group Holdings	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Net Cash Provided by (Used in) Operating Activities	-23	-23
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Proceeds on disposal of fixed and intangible assets	0	0
Additions to fixed assets	0	0
Payments to Acquire Intangible Assets	0	'
Acquisitions of subsidiaries, net of cash acquired	'	0
Payments to acquire other investments	0	0
Proceeds on sale of operations, net of cash disposed	0	'
Cash received on intercompany investing activities	65	180
Cash paid on intercompany investing activities	0	-129
Net cash used in continuing investing activities	65	51
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Proceeds from draw down of revolving credit facility	'	0
Debt issuance costs	0	'
Repayments of debt	0	0
Repurchase of shares	-35	'
Proceeds from issue of shares	43	19
Excess tax benefits from share-based payment arrangements	0	'
Dividends paid	-50	-47
Acquisition of noncontrolling interests	'	0
Dividends paid to noncontrolling interests	0	0
Cash received on intercompany financing activities	0	0
Cash paid on intercompany financing activities	0	0
Net cash (used in) provided by continuing financing activities	-42	-28
DECREASE IN CASH AND CASH EQUIVALENTS	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	3	1
CASH AND CASH EQUIVALENTS, END OF PERIOD	3	1
Guarantor Subsidiaries	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Net Cash Provided by (Used in) Operating Activities	4	-246
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Proceeds on disposal of fixed and intangible assets	1	2
Additions to fixed assets	-4	-1
Payments to Acquire Intangible Assets	0	'
Acquisitions of subsidiaries, net of cash acquired	'	0
Payments to acquire other investments	0	0
Proceeds on sale of operations, net of cash disposed	0	'
Cash received on intercompany investing activities	120	141
Cash paid on intercompany investing activities	0	0
Net cash used in continuing investing activities	117	142
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Proceeds from draw down of revolving credit facility	'	55
Debt issuance costs	0	'
Repayments of debt	-4	-4
Repurchase of shares	0	'
Proceeds from issue of shares	0	0
Excess tax benefits from share-based payment arrangements	0	'
Dividends paid	0	0
Acquisition of noncontrolling interests	'	0
Dividends paid to noncontrolling interests	0	0
Cash received on intercompany financing activities	16	235
Cash paid on intercompany financing activities	-133	-180
Net cash (used in) provided by continuing financing activities	-121	106
DECREASE IN CASH AND CASH EQUIVALENTS	0	2
Effect of exchange rate changes on cash and cash equivalents	0	0
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	3	0
CASH AND CASH EQUIVALENTS, END OF PERIOD	3	2
Other	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Net Cash Provided by (Used in) Operating Activities	25	308
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Proceeds on disposal of fixed and intangible assets	1	2
Additions to fixed assets	-19	-22
Payments to Acquire Intangible Assets	-1	'
Acquisitions of subsidiaries, net of cash acquired	'	-1
Payments to acquire other investments	-4	-1
Proceeds on sale of operations, net of cash disposed	5	'
Cash received on intercompany investing activities	115	0
Cash paid on intercompany investing activities	-16	-235
Net cash used in continuing investing activities	81	-257
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Proceeds from draw down of revolving credit facility	'	0
Debt issuance costs	-2	'
Repayments of debt	0	0
Repurchase of shares	0	'
Proceeds from issue of shares	0	0
Excess tax benefits from share-based payment arrangements	1	'
Dividends paid	-1	0
Acquisition of noncontrolling interests	'	-4
Dividends paid to noncontrolling interests	-2	-1
Cash received on intercompany financing activities	0	129
Cash paid on intercompany financing activities	-167	-141
Net cash (used in) provided by continuing financing activities	-171	-17
DECREASE IN CASH AND CASH EQUIVALENTS	-65	34
Effect of exchange rate changes on cash and cash equivalents	3	-5
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	790	499
CASH AND CASH EQUIVALENTS, END OF PERIOD	728	528
Consolidating adjustments	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Net Cash Provided by (Used in) Operating Activities	-1	0
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Proceeds on disposal of fixed and intangible assets	-1	0
Additions to fixed assets	1	0
Payments to Acquire Intangible Assets	0	'
Acquisitions of subsidiaries, net of cash acquired	'	0
Payments to acquire other investments	0	0
Proceeds on sale of operations, net of cash disposed	0	'
Cash received on intercompany investing activities	-300	-321
Cash paid on intercompany investing activities	16	364
Net cash used in continuing investing activities	-284	43
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Proceeds from draw down of revolving credit facility	'	0
Debt issuance costs	0	'
Repayments of debt	0	0
Repurchase of shares	0	'
Proceeds from issue of shares	0	0
Excess tax benefits from share-based payment arrangements	0	'
Dividends paid	1	0
Acquisition of noncontrolling interests	'	0
Dividends paid to noncontrolling interests	0	0
Cash received on intercompany financing activities	-16	-364
Cash paid on intercompany financing activities	300	321
Net cash (used in) provided by continuing financing activities	285	-43
DECREASE IN CASH AND CASH EQUIVALENTS	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	0	0
CASH AND CASH EQUIVALENTS, END OF PERIOD	0	0
Previously Reported | Willis Group Holdings	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Net Cash Provided by (Used in) Operating Activities	'	-25
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Net cash used in continuing investing activities	'	0
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Net cash (used in) provided by continuing financing activities	'	25
Previously Reported | Guarantor Subsidiaries	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Net Cash Provided by (Used in) Operating Activities	'	35
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Net cash used in continuing investing activities	'	1
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Net cash (used in) provided by continuing financing activities	'	-34
Previously Reported | Other	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Net Cash Provided by (Used in) Operating Activities	'	29
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Net cash used in continuing investing activities	'	-22
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Net cash (used in) provided by continuing financing activities	'	27
Previously Reported | Consolidating adjustments	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Net Cash Provided by (Used in) Operating Activities	'	0
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Net cash used in continuing investing activities	'	0
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Net cash (used in) provided by continuing financing activities	'	0
Restatement Adjustment | Willis Group Holdings	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Net Cash Provided by (Used in) Operating Activities	'	2
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Net cash used in continuing investing activities	'	51
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Net cash (used in) provided by continuing financing activities	'	-53
Restatement Adjustment | Guarantor Subsidiaries	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Net Cash Provided by (Used in) Operating Activities	'	-281
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Net cash used in continuing investing activities	'	141
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Net cash (used in) provided by continuing financing activities	'	140
Restatement Adjustment | Other	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Net Cash Provided by (Used in) Operating Activities	'	279
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Net cash used in continuing investing activities	'	-235
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Net cash (used in) provided by continuing financing activities	'	-44
Restatement Adjustment | Consolidating adjustments	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Net Cash Provided by (Used in) Operating Activities	'	0
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Net cash used in continuing investing activities	'	43
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Net cash (used in) provided by continuing financing activities	'	($43)

FINANCIAL_INFORMATION_FOR_ISSU2

FINANCIAL INFORMATION FOR ISSUER, PARENT GUARANTOR, OTHER GUARANTOR SUBSIDIARIES AND NON-GUARANTOR SUBSIDIARIES (Statement of operations) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Condensed Financial Statements, Captions [Line Items]	'	'
Commissions and fees	$1,090	$1,046
Investment income	4	4
Other income	3	1
Total revenues	1,097	1,051
Labor and Related Expense	-570	-568
Other Cost and Expense, Operating	-165	-162
Depreciation	-23	-26
Amortization of Intangible Assets	-13	-14
Operating Expenses	-771	-770
Operating Income (Loss)	326	281
Other income (expense), net	0	6
Income from group undertakings	0	0
Expenses due to group undertakings	0	0
Interest Expense	-32	-31
Income before income taxes and interest in earnings of associates	294	256
Income Tax Expense (Benefit)	-63	-48
Income Loss From Continuing Operations Before Interest In Earnings Of Associates	231	208
Interest in earnings of associates, net of tax	19	15
Equity account for subsidiaries	0	0
INCOME FROM CONTINUING OPERATIONS	250	'
Net Income (Loss) Attributable to Noncontrolling Interest	-4	-4
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	246	219
NET (LOSS) INCOME	250	223
Willis Group Holdings	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Commissions and fees	0	0
Investment income	0	0
Other income	0	0
Total revenues	0	0
Labor and Related Expense	0	0
Other Cost and Expense, Operating	-4	-1
Depreciation	0	0
Amortization of Intangible Assets	0	0
Operating Expenses	-4	-1
Operating Income (Loss)	-4	-1
Other income (expense), net	0	-3
Income from group undertakings	0	0
Expenses due to group undertakings	0	0
Interest Expense	-11	-11
Income before income taxes and interest in earnings of associates	-15	-15
Income Tax Expense (Benefit)	0	0
Income Loss From Continuing Operations Before Interest In Earnings Of Associates	-15	-15
Interest in earnings of associates, net of tax	0	0
Equity account for subsidiaries	261	234
INCOME FROM CONTINUING OPERATIONS	246	'
Net Income (Loss) Attributable to Noncontrolling Interest	0	0
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	246	219
NET (LOSS) INCOME	246	219
Guarantor companies [Member]	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Commissions and fees	2	0
Investment income	0	0
Other income	0	0
Total revenues	2	0
Labor and Related Expense	-19	-23
Other Cost and Expense, Operating	-41	-50
Depreciation	-5	-4
Amortization of Intangible Assets	0	0
Operating Expenses	-65	-77
Operating Income (Loss)	-63	-77
Other income (expense), net	1	1
Income from group undertakings	82	114
Expenses due to group undertakings	-49	-34
Interest Expense	-11	-17
Income before income taxes and interest in earnings of associates	-40	-13
Income Tax Expense (Benefit)	25	2
Income Loss From Continuing Operations Before Interest In Earnings Of Associates	-15	-11
Interest in earnings of associates, net of tax	3	2
Equity account for subsidiaries	268	244
INCOME FROM CONTINUING OPERATIONS	256	'
Net Income (Loss) Attributable to Noncontrolling Interest	0	0
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	256	235
NET (LOSS) INCOME	'	235
Trinity Acquisition Plc [Member]	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Commissions and fees	0	0
Investment income	0	0
Other income	0	0
Total revenues	0	0
Labor and Related Expense	0	0
Other Cost and Expense, Operating	0	0
Depreciation	0	0
Amortization of Intangible Assets	0	0
Operating Expenses	0	0
Operating Income (Loss)	0	0
Other income (expense), net	0	0
Income from group undertakings	22	13
Expenses due to group undertakings	-7	-6
Interest Expense	-9	-2
Income before income taxes and interest in earnings of associates	6	5
Income Tax Expense (Benefit)	-1	0
Income Loss From Continuing Operations Before Interest In Earnings Of Associates	5	5
Interest in earnings of associates, net of tax	0	0
Equity account for subsidiaries	215	217
INCOME FROM CONTINUING OPERATIONS	220	'
Net Income (Loss) Attributable to Noncontrolling Interest	0	0
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	220	222
NET (LOSS) INCOME	'	222
Other	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Commissions and fees	1,088	1,046
Investment income	4	4
Other income	3	1
Total revenues	1,095	1,051
Labor and Related Expense	-551	-545
Other Cost and Expense, Operating	-120	-111
Depreciation	-18	-22
Amortization of Intangible Assets	-13	-14
Operating Expenses	-702	-692
Operating Income (Loss)	393	359
Other income (expense), net	-1	8
Income from group undertakings	27	21
Expenses due to group undertakings	-75	-108
Interest Expense	-1	-1
Income before income taxes and interest in earnings of associates	343	279
Income Tax Expense (Benefit)	-87	-50
Income Loss From Continuing Operations Before Interest In Earnings Of Associates	256	229
Interest in earnings of associates, net of tax	16	13
Equity account for subsidiaries	0	0
INCOME FROM CONTINUING OPERATIONS	272	'
Net Income (Loss) Attributable to Noncontrolling Interest	-4	-4
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	268	238
NET (LOSS) INCOME	272	242
Consolidation entries [Member]	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Commissions and fees	0	0
Investment income	0	0
Other income	0	0
Total revenues	0	0
Labor and Related Expense	0	0
Other Cost and Expense, Operating	0	0
Depreciation	0	0
Amortization of Intangible Assets	0	0
Operating Expenses	0	0
Operating Income (Loss)	0	0
Other income (expense), net	0	0
Income from group undertakings	-131	-148
Expenses due to group undertakings	131	148
Interest Expense	0	0
Income before income taxes and interest in earnings of associates	0	0
Income Tax Expense (Benefit)	0	0
Income Loss From Continuing Operations Before Interest In Earnings Of Associates	0	0
Interest in earnings of associates, net of tax	0	0
Equity account for subsidiaries	-744	-695
INCOME FROM CONTINUING OPERATIONS	-744	'
Net Income (Loss) Attributable to Noncontrolling Interest	0	0
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	-744	-695
NET (LOSS) INCOME	'	-695
Previously Reported	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	219
Previously Reported | Willis Group Holdings	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Operating Income (Loss)	'	-4
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	219
Previously Reported | Guarantor companies [Member]	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Operating Income (Loss)	'	-72
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	236
Previously Reported | Trinity Acquisition Plc [Member]	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Operating Income (Loss)	'	0
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	223
Previously Reported | Other	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Operating Income (Loss)	'	178
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	98
Previously Reported | Consolidation entries [Member]	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Operating Income (Loss)	'	185
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	-557
Restatement Adjustment	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	0
Restatement Adjustment | Willis Group Holdings	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Operating Income (Loss)	'	3
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	0
Restatement Adjustment | Guarantor companies [Member]	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Operating Income (Loss)	'	-5
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	-1
Restatement Adjustment | Trinity Acquisition Plc [Member]	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Operating Income (Loss)	'	0
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	-1
Restatement Adjustment | Other	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Operating Income (Loss)	'	181
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	140
Restatement Adjustment | Consolidation entries [Member]	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Operating Income (Loss)	'	-185
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	'	($138)

FINANCIAL_INFORMATION_FOR_ISSU3

FINANCIAL INFORMATION FOR ISSUER, PARENT GUARANTOR, OTHER GUARANTOR SUBSIDIARIES AND NON-GUARANTOR SUBSIDIARIES (Comprehensive income) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Condensed Financial Statements, Captions [Line Items]	'	'
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	$258	$186
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	-4	-3
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	254	183
Willis Group Holdings	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	254	183
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	254	183
Guarantor companies [Member]	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	264	199
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	264	199
Trinity Acquisition Plc [Member]	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	228	191
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	228	191
Other	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	281	203
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	-4	-3
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	277	200
Consolidation entries [Member]	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	-769	-590
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	-769	-590
Previously Reported | Willis Group Holdings	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	'	183
Previously Reported | Guarantor companies [Member]	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	'	200
Previously Reported | Trinity Acquisition Plc [Member]	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	'	192
Previously Reported | Other	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	'	60
Previously Reported | Consolidation entries [Member]	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	'	-452
Restatement Adjustment | Willis Group Holdings	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	'	0
Restatement Adjustment | Guarantor companies [Member]	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	'	-1
Restatement Adjustment | Trinity Acquisition Plc [Member]	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	'	-1
Restatement Adjustment | Other	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	'	140
Restatement Adjustment | Consolidation entries [Member]	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	'	($138)

FINANCIAL_INFORMATION_FOR_ISSU4

FINANCIAL INFORMATION FOR ISSUER, PARENT GUARANTOR, OTHER GUARANTOR SUBSIDIARIES AND NON-GUARANTOR SUBSIDIARIES (Balance sheet) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	$734	$796	$531	$500
Accounts receivable, net	1,185	1,041	'	'
Fiduciary assets	9,306	8,412	'	'
Deferred tax assets	16	15	'	'
Other current assets	204	197	'	'
Amounts owed by group undertakings	0	0	'	'
Total current assets	11,445	10,461	'	'
Investments in subsidiaries	0	0	'	'
Fixed assets, net	482	481	'	'
Goodwill	2,835	2,838	'	2,827
Other intangible assets, net	339	353	'	'
Investments in associates	196	176	'	'
Deferred tax assets	6	7	'	'
Pension benefits asset	316	278	'	'
Other non-current assets	209	206	'	'
Non-current amounts due from group undertakings	0	0	'	'
Total non-current assets	4,383	4,339	'	'
TOTAL ASSETS	15,828	14,800	'	'
Fiduciary liabilities	9,306	8,412	'	'
Deferred revenue and accrued expenses	371	586	'	'
Income taxes payable	53	21	'	'
Short-term debt and current portion of long-term debt	15	15	'	'
Deferred tax liabilities	36	25	'	'
Other current liabilities	495	415	'	'
Amounts due to group undertakings	0	0	'	'
Total current liabilities	10,276	9,474	'	'
Investments in subsidiaries	0	0	'	'
Long-term debt	2,307	2,311	'	'
Liabilities for pension benefits	130	136	'	'
Deferred tax liabilities	78	56	'	'
Provisions for liabilities	211	206	'	'
Other non-current liabilities	354	374	'	'
Noncurrent amounts due to group undertakings	0	0	'	'
Total non-current liabilities	3,080	3,083	'	'
Total liabilities	13,356	12,557	'	'
Total Willis Group Holdings stockholders’ equity	2,442	2,215	'	'
Noncontrolling interests	30	28	'	'
Total equity	2,472	2,243	1,893	1,725
TOTAL LIABILITIES AND EQUITY	15,828	14,800	'	'
Willis Group Holdings	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	3	3	1	1
Accounts receivable, net	1	0	'	'
Fiduciary assets	0	0	'	'
Deferred tax assets	0	0	'	'
Other current assets	1	1	'	'
Amounts owed by group undertakings	3,989	4,051	'	'
Total current assets	3,994	4,055	'	'
Investments in subsidiaries	0	0	'	'
Fixed assets, net	0	0	'	'
Goodwill	0	0	'	'
Other intangible assets, net	0	0	'	'
Investments in associates	0	0	'	'
Deferred tax assets	0	0	'	'
Pension benefits asset	0	0	'	'
Other non-current assets	3	4	'	'
Non-current amounts due from group undertakings	0	0	'	'
Total non-current assets	3	4	'	'
TOTAL ASSETS	3,997	4,059	'	'
Fiduciary liabilities	0	0	'	'
Deferred revenue and accrued expenses	2	2	'	'
Income taxes payable	0	0	'	'
Short-term debt and current portion of long-term debt	0	0	'	'
Deferred tax liabilities	0	0	'	'
Other current liabilities	56	62	'	'
Amounts due to group undertakings	0	0	'	'
Total current liabilities	58	64	'	'
Investments in subsidiaries	702	985	'	'
Long-term debt	795	795	'	'
Liabilities for pension benefits	0	0	'	'
Deferred tax liabilities	0	0	'	'
Provisions for liabilities	0	0	'	'
Other non-current liabilities	0	0	'	'
Noncurrent amounts due to group undertakings	0	0	'	'
Total non-current liabilities	1,497	1,780	'	'
Total liabilities	1,555	1,844	'	'
Total Willis Group Holdings stockholders’ equity	2,442	2,215	'	'
Noncontrolling interests	0	0	'	'
Total equity	2,442	2,215	'	'
TOTAL LIABILITIES AND EQUITY	3,997	4,059	'	'
Guarantor companies [Member]	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	3	3	2	0
Accounts receivable, net	4	4	'	'
Fiduciary assets	0	0	'	'
Deferred tax assets	0	0	'	'
Other current assets	59	36	'	'
Amounts owed by group undertakings	813	975	'	'
Total current assets	879	1,018	'	'
Investments in subsidiaries	4,024	3,716	'	'
Fixed assets, net	64	66	'	'
Goodwill	0	0	'	'
Other intangible assets, net	0	0	'	'
Investments in associates	160	156	'	'
Deferred tax assets	0	0	'	'
Pension benefits asset	0	0	'	'
Other non-current assets	6	5	'	'
Non-current amounts due from group undertakings	1,132	1,113	'	'
Total non-current assets	5,386	5,056	'	'
TOTAL ASSETS	6,265	6,074	'	'
Fiduciary liabilities	0	0	'	'
Deferred revenue and accrued expenses	14	29	'	'
Income taxes payable	0	4	'	'
Short-term debt and current portion of long-term debt	0	0	'	'
Deferred tax liabilities	0	0	'	'
Other current liabilities	23	42	'	'
Amounts due to group undertakings	5,768	5,813	'	'
Total current liabilities	5,805	5,888	'	'
Investments in subsidiaries	0	0	'	'
Long-term debt	733	733	'	'
Liabilities for pension benefits	0	0	'	'
Deferred tax liabilities	1	1	'	'
Provisions for liabilities	3	0	'	'
Other non-current liabilities	41	48	'	'
Noncurrent amounts due to group undertakings	519	518	'	'
Total non-current liabilities	1,297	1,300	'	'
Total liabilities	7,102	7,188	'	'
Total Willis Group Holdings stockholders’ equity	-837	-1,114	'	'
Noncontrolling interests	0	0	'	'
Total equity	-837	-1,114	'	'
TOTAL LIABILITIES AND EQUITY	6,265	6,074	'	'
Trinity Acquisition Plc [Member]	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	0	0	0	0
Accounts receivable, net	0	0	'	'
Fiduciary assets	0	0	'	'
Deferred tax assets	0	0	'	'
Other current assets	1	1	'	'
Amounts owed by group undertakings	803	793	'	'
Total current assets	804	794	'	'
Investments in subsidiaries	2,940	2,705	'	'
Fixed assets, net	0	0	'	'
Goodwill	0	0	'	'
Other intangible assets, net	0	0	'	'
Investments in associates	0	0	'	'
Deferred tax assets	0	0	'	'
Pension benefits asset	0	0	'	'
Other non-current assets	9	9	'	'
Non-current amounts due from group undertakings	518	518	'	'
Total non-current assets	3,467	3,232	'	'
TOTAL ASSETS	4,271	4,026	'	'
Fiduciary liabilities	0	0	'	'
Deferred revenue and accrued expenses	0	0	'	'
Income taxes payable	7	5	'	'
Short-term debt and current portion of long-term debt	15	15	'	'
Deferred tax liabilities	0	0	'	'
Other current liabilities	3	11	'	'
Amounts due to group undertakings	165	157	'	'
Total current liabilities	190	188	'	'
Investments in subsidiaries	0	0	'	'
Long-term debt	778	782	'	'
Liabilities for pension benefits	0	0	'	'
Deferred tax liabilities	0	0	'	'
Provisions for liabilities	0	0	'	'
Other non-current liabilities	0	0	'	'
Noncurrent amounts due to group undertakings	428	423	'	'
Total non-current liabilities	1,206	1,205	'	'
Total liabilities	1,396	1,393	'	'
Total Willis Group Holdings stockholders’ equity	2,875	2,633	'	'
Noncontrolling interests	0	0	'	'
Total equity	2,875	2,633	'	'
TOTAL LIABILITIES AND EQUITY	4,271	4,026	'	'
Other	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	728	790	528	499
Accounts receivable, net	1,180	1,037	'	'
Fiduciary assets	9,306	8,412	'	'
Deferred tax assets	16	16	'	'
Other current assets	183	186	'	'
Amounts owed by group undertakings	1,456	1,484	'	'
Total current assets	12,869	11,925	'	'
Investments in subsidiaries	0	0	'	'
Fixed assets, net	418	415	'	'
Goodwill	2,835	2,838	'	'
Other intangible assets, net	339	353	'	'
Investments in associates	36	20	'	'
Deferred tax assets	6	7	'	'
Pension benefits asset	316	278	'	'
Other non-current assets	191	188	'	'
Non-current amounts due from group undertakings	0	0	'	'
Total non-current assets	4,141	4,099	'	'
TOTAL ASSETS	17,010	16,024	'	'
Fiduciary liabilities	9,306	8,412	'	'
Deferred revenue and accrued expenses	355	555	'	'
Income taxes payable	86	39	'	'
Short-term debt and current portion of long-term debt	0	0	'	'
Deferred tax liabilities	36	25	'	'
Other current liabilities	413	300	'	'
Amounts due to group undertakings	1,128	1,333	'	'
Total current liabilities	11,324	10,664	'	'
Investments in subsidiaries	0	0	'	'
Long-term debt	1	1	'	'
Liabilities for pension benefits	130	136	'	'
Deferred tax liabilities	77	55	'	'
Provisions for liabilities	208	206	'	'
Other non-current liabilities	313	326	'	'
Noncurrent amounts due to group undertakings	703	690	'	'
Total non-current liabilities	1,432	1,414	'	'
Total liabilities	12,756	12,078	'	'
Total Willis Group Holdings stockholders’ equity	4,224	3,918	'	'
Noncontrolling interests	30	28	'	'
Total equity	4,254	3,946	'	'
TOTAL LIABILITIES AND EQUITY	17,010	16,024	'	'
Consolidation entries [Member]	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	0	0	0	0
Accounts receivable, net	0	0	'	'
Fiduciary assets	0	0	'	'
Deferred tax assets	0	-1	'	'
Other current assets	-40	-27	'	'
Amounts owed by group undertakings	-7,061	-7,303	'	'
Total current assets	-7,101	-7,331	'	'
Investments in subsidiaries	-6,964	-6,421	'	'
Fixed assets, net	0	0	'	'
Goodwill	0	0	'	'
Other intangible assets, net	0	0	'	'
Investments in associates	0	0	'	'
Deferred tax assets	0	0	'	'
Pension benefits asset	0	0	'	'
Other non-current assets	0	0	'	'
Non-current amounts due from group undertakings	-1,650	-1,631	'	'
Total non-current assets	-8,614	-8,052	'	'
TOTAL ASSETS	-15,715	-15,383	'	'
Fiduciary liabilities	0	0	'	'
Deferred revenue and accrued expenses	0	0	'	'
Income taxes payable	-40	-27	'	'
Short-term debt and current portion of long-term debt	0	0	'	'
Deferred tax liabilities	0	0	'	'
Other current liabilities	0	0	'	'
Amounts due to group undertakings	-7,061	-7,303	'	'
Total current liabilities	-7,101	-7,330	'	'
Investments in subsidiaries	-702	-985	'	'
Long-term debt	0	0	'	'
Liabilities for pension benefits	0	0	'	'
Deferred tax liabilities	0	0	'	'
Provisions for liabilities	0	0	'	'
Other non-current liabilities	0	0	'	'
Noncurrent amounts due to group undertakings	-1,650	-1,631	'	'
Total non-current liabilities	-2,352	-2,616	'	'
Total liabilities	-9,453	-9,946	'	'
Total Willis Group Holdings stockholders’ equity	-6,262	-5,437	'	'
Noncontrolling interests	0	0	'	'
Total equity	-6,262	-5,437	'	'
TOTAL LIABILITIES AND EQUITY	($15,715)	($15,383)	'	'

FINANCIAL_INFORMATION_FOR_ISSU5

FINANCIAL INFORMATION FOR ISSUER, PARENT GUARANTOR, OTHER GUARANTOR SUBSIDIARIES AND NON-GUARANTOR SUBSIDIARIES (Cash flows) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	$5	$39	'	'
Proceeds on disposal of fixed and intangible assets	1	4	'	'
Payments to Acquire Property, Plant, and Equipment	-22	-23	'	'
Payments to Acquire Intangible Assets	-1	0	'	'
Payments to Acquire Businesses, Net of Cash Acquired	0	1	'	'
Payments to Acquire Other Investments	-4	-1	'	'
Proceeds on sale of operations, net of cash disposed	5	0	'	'
Cash received on intercompany investing activities	0	0	'	'
Cash paid on intercompany investing activities	0	0	'	'
Net cash used in continuing investing activities	-21	-21	'	'
Debt issuance costs	-2	0	'	'
Repayments of Other Debt	-4	-4	'	'
Payments for Repurchase of Common Stock	-35	'	'	'
Proceeds from issue of shares	43	19	'	'
Excess tax benefits from share-based payment arrangements	1	'	'	'
Payments of Ordinary Dividends, Common Stock	-50	-47	'	'
Payments to Acquire Additional Interest in Subsidiaries	0	-4	'	'
Payments of Ordinary Dividends, Noncontrolling Interest	-2	-1	'	'
Cash received on intercompany financing activities	0	0	'	'
Cash paid on intercompany financing activities	0	0	'	'
Net Cash Provided by (Used in) Financing Activities	-49	18	'	'
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	-65	36	'	'
Effect of exchange rate changes on cash and cash equivalents	3	-5	'	'
CASH AND CASH EQUIVALENTS, END OF PERIOD	734	531	796	500
Proceeds from Other Debt	'	55	'	'
Willis Group Holdings	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	-23	-23	'	'
Proceeds on disposal of fixed and intangible assets	0	0	'	'
Payments to Acquire Property, Plant, and Equipment	0	0	'	'
Payments to Acquire Intangible Assets	0	'	'	'
Payments to Acquire Businesses, Net of Cash Acquired	'	0	'	'
Payments to Acquire Other Investments	0	0	'	'
Proceeds on sale of operations, net of cash disposed	0	'	'	'
Cash received on intercompany investing activities	65	180	'	'
Cash paid on intercompany investing activities	0	-129	'	'
Net cash used in continuing investing activities	65	51	'	'
Debt issuance costs	0	'	'	'
Repayments of Other Debt	0	0	'	'
Payments for Repurchase of Common Stock	-35	'	'	'
Proceeds from issue of shares	43	19	'	'
Excess tax benefits from share-based payment arrangements	0	'	'	'
Payments of Ordinary Dividends, Common Stock	-50	-47	'	'
Payments to Acquire Additional Interest in Subsidiaries	'	0	'	'
Payments of Ordinary Dividends, Noncontrolling Interest	0	0	'	'
Cash received on intercompany financing activities	0	0	'	'
Cash paid on intercompany financing activities	0	0	'	'
Net Cash Provided by (Used in) Financing Activities	-42	-28	'	'
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	0	0	'	'
Effect of exchange rate changes on cash and cash equivalents	0	0	'	'
CASH AND CASH EQUIVALENTS, END OF PERIOD	3	1	3	1
Proceeds from Other Debt	'	0	'	'
Guarantor companies [Member]	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	28	467	'	'
Proceeds on disposal of fixed and intangible assets	1	2	'	'
Payments to Acquire Property, Plant, and Equipment	-4	-1	'	'
Payments to Acquire Intangible Assets	0	'	'	'
Payments to Acquire Businesses, Net of Cash Acquired	'	0	'	'
Payments to Acquire Other Investments	0	0	'	'
Proceeds on sale of operations, net of cash disposed	0	'	'	'
Cash received on intercompany investing activities	120	53	'	'
Cash paid on intercompany investing activities	0	-557	'	'
Net cash used in continuing investing activities	117	-503	'	'
Debt issuance costs	0	'	'	'
Repayments of Other Debt	0	0	'	'
Payments for Repurchase of Common Stock	0	'	'	'
Proceeds from issue of shares	0	0	'	'
Excess tax benefits from share-based payment arrangements	0	'	'	'
Payments of Ordinary Dividends, Common Stock	0	0	'	'
Payments to Acquire Additional Interest in Subsidiaries	'	0	'	'
Payments of Ordinary Dividends, Noncontrolling Interest	0	0	'	'
Cash received on intercompany financing activities	0	235	'	'
Cash paid on intercompany financing activities	-145	-197	'	'
Net Cash Provided by (Used in) Financing Activities	-145	38	'	'
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	0	2	'	'
Effect of exchange rate changes on cash and cash equivalents	0	0	'	'
CASH AND CASH EQUIVALENTS, END OF PERIOD	3	2	3	0
Proceeds from Other Debt	'	0	'	'
Trinity Acquisition Plc [Member]	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	-24	-156	'	'
Proceeds on disposal of fixed and intangible assets	0	0	'	'
Payments to Acquire Property, Plant, and Equipment	0	0	'	'
Payments to Acquire Intangible Assets	0	'	'	'
Payments to Acquire Businesses, Net of Cash Acquired	'	0	'	'
Payments to Acquire Other Investments	0	0	'	'
Proceeds on sale of operations, net of cash disposed	0	'	'	'
Cash received on intercompany investing activities	12	148	'	'
Cash paid on intercompany investing activities	0	0	'	'
Net cash used in continuing investing activities	12	148	'	'
Debt issuance costs	0	'	'	'
Repayments of Other Debt	-4	-4	'	'
Payments for Repurchase of Common Stock	0	'	'	'
Proceeds from issue of shares	0	0	'	'
Excess tax benefits from share-based payment arrangements	0	'	'	'
Payments of Ordinary Dividends, Common Stock	0	-557	'	'
Payments to Acquire Additional Interest in Subsidiaries	'	0	'	'
Payments of Ordinary Dividends, Noncontrolling Interest	0	0	'	'
Cash received on intercompany financing activities	16	557	'	'
Cash paid on intercompany financing activities	0	-43	'	'
Net Cash Provided by (Used in) Financing Activities	12	8	'	'
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	0	0	'	'
Effect of exchange rate changes on cash and cash equivalents	0	0	'	'
CASH AND CASH EQUIVALENTS, END OF PERIOD	0	0	0	0
Proceeds from Other Debt	'	55	'	'
Other	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	25	308	'	'
Proceeds on disposal of fixed and intangible assets	1	2	'	'
Payments to Acquire Property, Plant, and Equipment	-19	-22	'	'
Payments to Acquire Intangible Assets	-1	'	'	'
Payments to Acquire Businesses, Net of Cash Acquired	'	1	'	'
Payments to Acquire Other Investments	-4	-1	'	'
Proceeds on sale of operations, net of cash disposed	5	'	'	'
Cash received on intercompany investing activities	115	0	'	'
Cash paid on intercompany investing activities	-16	-235	'	'
Net cash used in continuing investing activities	81	-257	'	'
Debt issuance costs	-2	'	'	'
Repayments of Other Debt	0	0	'	'
Payments for Repurchase of Common Stock	0	'	'	'
Proceeds from issue of shares	0	0	'	'
Excess tax benefits from share-based payment arrangements	1	'	'	'
Payments of Ordinary Dividends, Common Stock	-1	0	'	'
Payments to Acquire Additional Interest in Subsidiaries	'	-4	'	'
Payments of Ordinary Dividends, Noncontrolling Interest	-2	-1	'	'
Cash received on intercompany financing activities	0	129	'	'
Cash paid on intercompany financing activities	-167	-141	'	'
Net Cash Provided by (Used in) Financing Activities	-171	-17	'	'
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	-65	34	'	'
Effect of exchange rate changes on cash and cash equivalents	3	-5	'	'
CASH AND CASH EQUIVALENTS, END OF PERIOD	728	528	790	499
Proceeds from Other Debt	'	0	'	'
Consolidation entries [Member]	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	-1	-557	'	'
Proceeds on disposal of fixed and intangible assets	-1	0	'	'
Payments to Acquire Property, Plant, and Equipment	1	0	'	'
Payments to Acquire Intangible Assets	0	'	'	'
Payments to Acquire Businesses, Net of Cash Acquired	'	0	'	'
Payments to Acquire Other Investments	0	0	'	'
Proceeds on sale of operations, net of cash disposed	0	'	'	'
Cash received on intercompany investing activities	-312	-381	'	'
Cash paid on intercompany investing activities	16	921	'	'
Net cash used in continuing investing activities	-296	540	'	'
Debt issuance costs	0	'	'	'
Repayments of Other Debt	0	0	'	'
Payments for Repurchase of Common Stock	0	'	'	'
Proceeds from issue of shares	0	0	'	'
Excess tax benefits from share-based payment arrangements	0	'	'	'
Payments of Ordinary Dividends, Common Stock	1	557	'	'
Payments to Acquire Additional Interest in Subsidiaries	'	0	'	'
Payments of Ordinary Dividends, Noncontrolling Interest	0	0	'	'
Cash received on intercompany financing activities	-16	-921	'	'
Cash paid on intercompany financing activities	312	381	'	'
Net Cash Provided by (Used in) Financing Activities	297	17	'	'
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	0	0	'	'
Effect of exchange rate changes on cash and cash equivalents	0	0	'	'
CASH AND CASH EQUIVALENTS, END OF PERIOD	0	0	0	0
Proceeds from Other Debt	'	0	'	'
Previously Reported | Willis Group Holdings	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	'	-25	'	'
Net cash used in continuing investing activities	'	0	'	'
Net Cash Provided by (Used in) Financing Activities	'	25	'	'
Previously Reported | Guarantor companies [Member]	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	'	587	'	'
Net cash used in continuing investing activities	'	1	'	'
Net Cash Provided by (Used in) Financing Activities	'	-586	'	'
Previously Reported | Trinity Acquisition Plc [Member]	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	'	5	'	'
Net cash used in continuing investing activities	'	0	'	'
Net Cash Provided by (Used in) Financing Activities	'	-5	'	'
Previously Reported | Other	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	'	29	'	'
Net cash used in continuing investing activities	'	-22	'	'
Net Cash Provided by (Used in) Financing Activities	'	27	'	'
Previously Reported | Consolidation entries [Member]	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	'	-557	'	'
Net cash used in continuing investing activities	'	0	'	'
Net Cash Provided by (Used in) Financing Activities	'	557	'	'
Restatement Adjustment | Willis Group Holdings	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	'	2	'	'
Net cash used in continuing investing activities	'	51	'	'
Net Cash Provided by (Used in) Financing Activities	'	-53	'	'
Restatement Adjustment | Guarantor companies [Member]	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	'	-120	'	'
Net cash used in continuing investing activities	'	-504	'	'
Net Cash Provided by (Used in) Financing Activities	'	624	'	'
Restatement Adjustment | Trinity Acquisition Plc [Member]	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	'	-161	'	'
Net cash used in continuing investing activities	'	148	'	'
Net Cash Provided by (Used in) Financing Activities	'	13	'	'
Restatement Adjustment | Other	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	'	279	'	'
Net cash used in continuing investing activities	'	-235	'	'
Net Cash Provided by (Used in) Financing Activities	'	-44	'	'
Restatement Adjustment | Consolidation entries [Member]	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Net Cash Provided by (Used in) Operating Activities	'	0	'	'
Net cash used in continuing investing activities	'	540	'	'
Net Cash Provided by (Used in) Financing Activities	'	($540)	'	'