Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
REVENUES
Commissions and fees	$ 3,414	$ 3,293	$ 3,200
Investment income	31	38	50
Other income	2	1	3
Total revenues	3,447	3,332	3,253
EXPENSES
Salaries and benefits	(2,087)	(1,868)	(1,822)
Other operating expenses	(656)	(564)	(590)
Depreciation expense	(74)	(63)	(64)
Amortization of intangible assets	(68)	(82)	(100)
Net gain (loss) on disposal of operations	4	(2)	13
Total expenses	(2,881)	(2,579)	(2,563)
OPERATING INCOME	566	753	690
Make-whole on repurchase and redemption of senior notes and write-off of unamortized debt issuance costs	(171)
Interest expense	(156)	(166)	(174)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES AND INTEREST IN EARNINGS OF ASSOCIATES	239	587	516
Income taxes	(32)	(140)	(94)
INCOME FROM CONTINUING OPERATIONS BEFORE INTEREST IN EARNINGS OF ASSOCIATES	207	447	422
Interest in earnings of associates, net of tax	12	23	33
INCOME FROM CONTINUING OPERATIONS	219	470	455
Discontinued operations, net of tax	1		4
NET INCOME	220	470	459
Less: net income attributable to noncontrolling interests	(16)	(15)	(21)
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	204	455	438
AMOUNTS ATTRIBUTABLE TO WILLIS GROUP HOLDINGS SHAREHOLDERS
Income from continued operations, net of tax	203	455	434
Income from discontinued operations, net of tax	1		4
NET INCOME ATTRIBUTABLE TO WILLIS GROUP HOLDINGS	$ 204	$ 455	$ 438
BASIC EARNINGS PER SHARE
Continuing operations	$ 1.17	$ 2.68	$ 2.58
DILUTED EARNINGS PER SHARE
Continuing operations	$ 1.15	$ 2.66	$ 2.57
CASH DIVIDENDS DECLARED PER SHARE	$ 1.04	$ 1.04	$ 1.04