Revenue (Tables)

12 Months Ended

Dec. 31, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following schedule disaggregates various components of the Company's revenue:

	Twelve Months Ended December 31,
	2018		2017
Marsh:
EMEA	$	2,132	$	2,033
Asia Pacific	683		645
Latin America	400		404
Total International	3,215		3,082
U.S./Canada	3,662		3,322
Total Marsh	6,877		6,404
Guy Carpenter	1,286		1,187
Subtotal	8,163		7,591
Fiduciary interest income	65		39
Total Risk and Insurance Services	$	8,228	$	7,630
Mercer:
Defined Benefit Consulting & Administration	$	1,279	$	1,381
Investment Management & Related Services	906		767
Total Wealth	2,185		2,148
Health	1,735		1,648
Career	812		732
Total Mercer	4,732		4,528
Oliver Wyman	2,047		1,916
Total Consulting	$	6,779	$	6,444

Note: The 2017 information is prior to the adoption of ASC 606.

Contract with Customer, Asset and Liability

The following schedule provides contract assets and contract liabilities information from contracts with customers.

(In millions)	December 31, 2018		January 1, 2018
Contract Assets	$	112	$	128
Contract Liabilities	$	545	$	583