Revenue (Tables)

9 Months Ended

Sep. 30, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

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

	Three Months Ended September 30,		Nine Months Ended September 30,
	2018		2018
Marsh:
EMEA	$	441	$	1,610
Asia Pacific	167		514
Latin America	96		279
Total International	704		2,403
U.S./Canada	926		2,670
Total Marsh	1,630		5,073
Guy Carpenter	215		1,184
Subtotal	1,845		6,257
Fiduciary interest income	18		46
Total Risk and Insurance Services	$	1,863	$	6,303
Mercer:
Defined Benefit Consulting & Administration	$	300	$	959
Investment Management & Related Services	225		683
Total Wealth	525		1,642
Health	415		1,286
Career	235		576
Total Mercer	1,175		3,504
Oliver Wyman	481		1,470
Total Consulting	$	1,656	$	4,974

Contract with Customer, Asset and Liability

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

(In millions)	September 30, 2018		January 1, 2018
Contract Assets	$	139	$	128
Contract Liabilities	$	577	$	583