Financial Information for Parent Issuer, Guarantor Subsidiaries and Non-Guarantor Subsidiaries (Details 1) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010		Dec. 31, 2009
CURRENT ASSETS
Cash and cash equivalents	$ 317	$ 316	$ 167	[1]	$ 221	[1]
Accounts receivable	1,049	839
Fiduciary assets	11,256	9,569
Deferred tax assets	32	36
Other current assets	327	340
Total current assets	12,981	11,100
Investments in subsidiaries	0	0
Amounts owed by (to) Group undertakings	0	0
NON-CURRENT ASSETS
Fixed assets	391	381
Goodwill	3,317	3,294			3,277
Other intangible assets, net	461	492
Investments in associates	186	161
Deferred tax assets	9	7
Pension benefits asset	231	179
Total other non-current assets	365	233
Total non-current assets	4,960	4,747
TOTAL ASSETS	17,941	15,847
CURRENT LIABILITIES
Fiduciary liabilities	11,256	9,569
Deferred revenue and accrued expenses	323	298
Income taxes payable	50	57
Short-term debt and current portion of long-term debt	114	110
Deferred tax liabilities	22	9
Total other current liabilities	318	266
Total current liabilities	12,083	10,309
NON-CURRENT LIABILITIES
Long-term debt	2,307	2,157
Liabilities for pension benefits	150	164
Deferred tax liabilities	111	83
Provisions for liabilities	184	179
Total other non-current liabilities	367	347
Total non-current liabilities	3,119	2,930
Total Liabilities	15,202	13,239
EQUITY
Total Willis Group Holdings shareholders' equity	2,707	2,577
Noncontrolling interests	32	31
Total equity	2,739	2,608	2,429		2,229
TOTAL LIABILITIES AND EQUITY	17,941	15,847
Willis Group Holdings
CURRENT ASSETS
Cash and cash equivalents	0	0	0		0
Accounts receivable	0	2
Fiduciary assets	0	0
Deferred tax assets	0	0
Other current assets	3	0
Total current assets	3	2
Investments in subsidiaries	(911)	(1,039)
Amounts owed by (to) Group undertakings	4,462	3,659
NON-CURRENT ASSETS
Fixed assets	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
Total other non-current assets	6	0
Total non-current assets	6	0
TOTAL ASSETS	3,560	2,622
CURRENT LIABILITIES
Fiduciary liabilities	0	0
Deferred revenue and accrued expenses	1	1
Income taxes payable	0	0
Short-term debt and current portion of long-term debt	0	0
Deferred tax liabilities	0	0
Total other current liabilities	58	44
Total current liabilities	59	45
NON-CURRENT LIABILITIES
Long-term debt	794	0
Liabilities for pension benefits	0	0
Deferred tax liabilities	0	0
Provisions for liabilities	0	0
Total other non-current liabilities	0	0
Total non-current liabilities	794	0
Total Liabilities	853	45
EQUITY
Total Willis Group Holdings shareholders' equity	2,707	2,577
Noncontrolling interests	0	0
Total equity	2,707	2,577
TOTAL LIABILITIES AND EQUITY	3,560	2,622
The Guarantors
CURRENT ASSETS
Cash and cash equivalents	87	76	81		104
Accounts receivable	0	0
Fiduciary assets	0	0
Deferred tax assets	0	1
Other current assets	175	80
Total current assets	262	157
Investments in subsidiaries	4,639	4,429
Amounts owed by (to) Group undertakings	(4,311)	(3,588)
NON-CURRENT ASSETS
Fixed assets	58	52
Goodwill	0	0
Other intangible assets, net	0	0
Investments in associates	0	0
Deferred tax assets	0	0
Pension benefits asset	0	0
Total other non-current assets	187	207
Total non-current assets	245	259
TOTAL ASSETS	835	1,257
CURRENT LIABILITIES
Fiduciary liabilities	0	0
Deferred revenue and accrued expenses	0	0
Income taxes payable	51	0
Short-term debt and current portion of long-term debt	110	110
Deferred tax liabilities	1	4
Total other current liabilities	71	53
Total current liabilities	233	167
NON-CURRENT LIABILITIES
Long-term debt	1,513	2,153
Liabilities for pension benefits	0	0
Deferred tax liabilities	30	29
Provisions for liabilities	0	0
Total other non-current liabilities	17	26
Total non-current liabilities	1,560	2,208
Total Liabilities	1,793	2,375
EQUITY
Total Willis Group Holdings shareholders' equity	(958)	(1,118)
Noncontrolling interests	0	0
Total equity	(958)	(1,118)
TOTAL LIABILITIES AND EQUITY	835	1,257
Other [Member]
CURRENT ASSETS
Cash and cash equivalents	230	240	86		117
Accounts receivable	1,021	809
Fiduciary assets	11,919	10,167
Deferred tax assets	32	35
Other current assets	434	293
Total current assets	13,636	11,544
Investments in subsidiaries	3,875	3,855
Amounts owed by (to) Group undertakings	(151)	(71)
NON-CURRENT ASSETS
Fixed assets	335	330
Goodwill	1,699	1,696
Other intangible assets, net	477	492
Investments in associates	(45)	(51)
Deferred tax assets	7	7
Pension benefits asset	231	179
Total other non-current assets	172	149
Total non-current assets	2,876	2,802
TOTAL ASSETS	20,236	18,130
CURRENT LIABILITIES
Fiduciary liabilities	11,919	10,167
Deferred revenue and accrued expenses	322	297
Income taxes payable	107	69
Short-term debt and current portion of long-term debt	4	0
Deferred tax liabilities	21	5
Total other current liabilities	222	189
Total current liabilities	12,595	10,727
NON-CURRENT LIABILITIES
Long-term debt	0	4
Liabilities for pension benefits	150	164
Deferred tax liabilities	81	54
Provisions for liabilities	188	183
Total other non-current liabilities	350	321
Total non-current liabilities	769	726
Total Liabilities	13,364	11,453
EQUITY
Total Willis Group Holdings shareholders' equity	6,840	6,646
Noncontrolling interests	32	31
Total equity	6,872	6,677
TOTAL LIABILITIES AND EQUITY	20,236	18,130
Consolidating Adjustments [Member]
CURRENT ASSETS
Cash and cash equivalents	0	0	0		0
Accounts receivable	28	28
Fiduciary assets	(663)	(598)
Deferred tax assets	0	0
Other current assets	(285)	(33)
Total current assets	(920)	(603)
Investments in subsidiaries	(7,603)	(7,245)
Amounts owed by (to) Group undertakings	0	0
NON-CURRENT ASSETS
Fixed assets	(2)	(1)
Goodwill	1,618	1,598
Other intangible assets, net	(16)	0
Investments in associates	231	212
Deferred tax assets	2	0
Pension benefits asset	0	0
Total other non-current assets	0	(123)
Total non-current assets	1,833	1,686
TOTAL ASSETS	(6,690)	(6,162)
CURRENT LIABILITIES
Fiduciary liabilities	(663)	(598)
Deferred revenue and accrued expenses	0	0
Income taxes payable	(108)	(12)
Short-term debt and current portion of long-term debt	0	0
Deferred tax liabilities	0	0
Total other current liabilities	(33)	(20)
Total current liabilities	(804)	(630)
NON-CURRENT LIABILITIES
Long-term debt	0	0
Liabilities for pension benefits	0	0
Deferred tax liabilities	0	0
Provisions for liabilities	(4)	(4)
Total other non-current liabilities	0	0
Total non-current liabilities	(4)	(4)
Total Liabilities	(808)	(634)
EQUITY
Total Willis Group Holdings shareholders' equity	(5,882)	(5,528)
Noncontrolling interests	0	0
Total equity	(5,882)	(5,528)
TOTAL LIABILITIES AND EQUITY	$ (6,690)	$ (6,162)

[1] The 2010 Unaudited Condensed Consolidated Statement of Cash Flows has been recast to conform to the new balance sheet presentation. See Note 2 - Basis of Presentation and Significant Accounting Policies for details.