Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Components of fixed assets

The components of fixed assets are as follows:

December 31,
(In millions of dollars)	2017			2016
Furniture and equipment	$	1,179		$	1,113
Land and buildings	385			389
Leasehold and building improvements	974			906
	2,538			2,408
Less-accumulated depreciation and amortization	(1,826		)	(1,683		)
	$	712		$	725

Diluted earnings per share for continuing operations

Reconciliations of the applicable components used to calculate basic and diluted EPS - Continuing Operations are presented below. The reconciling items related to the EPS calculation are the same for both basic and diluted EPS.

Basic and Diluted EPS Calculation - Continuing Operations
(In millions, except per share figures)	2017		2016		2015
Net income from continuing operations	$	1,510	$	1,795	$	1,636
Less: Net income attributable to non-controlling interests	20		27		37
	$	1,490	$	1,768	$	1,599
Basic weighted average common shares outstanding	513		519		531
Dilutive effect of potentially issuable common shares	6		5		5
Diluted weighted average common shares outstanding	519		524		536
Average stock price used to calculate common stock equivalents	$	77.30	$	63.51	$	56.27

Schedule of Prospective Adoption of New Accounting Pronouncements

When the Company files its financial statements for 2018, the consolidated statements of income for 2017 and 2016 will include the following reclassification:

	2017			2016
Risk and Insurance Services	$	140		$	172
Consulting	64			65
Corporate	(3		)	(4		)
Increase in Compensation and Benefits	201			233
Other Net Periodic Benefit Credit	(201		)	(233		)
Net Impact of Reclassification	$	—		$	—