Revenue (Tables)

6 Months Ended

Jun. 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 June 30,		Six Months Ended June 30,
	2018		2018
Marsh:
EMEA	$	526	$	1,169
Asia Pacific	183		347
Latin America	99		183
Total International	808		1,699
U.S./Canada	941		1,744
Total Marsh	1,749		3,443
Guy Carpenter	332		969
Subtotal	2,081		4,412
Fiduciary interest income	15		28
Total Risk and Insurance Services	$	2,096	$	4,440
Mercer:
Defined Benefit Consulting & Administration	$	320	$	659
Investment Management & Related Services	232		458
Total Wealth	552		1,117
Health	429		871
Career	177		341
Total Mercer	1,158		2,329
Oliver Wyman	492		989
Total Consulting	$	1,650	$	3,318

Contract with Customer, Asset and Liability

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

(In millions)	January 1, 2018		June 30, 2018
Contract Assets	$	128	$	178
Contract Liabilities	$	583	$	647