Goodwill and Other Intangibles (Tables)

9 Months Ended

Sep. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in the Carrying Amount of Goodwill

Changes in the carrying amount of goodwill are as follows:

September 30,
(In millions)	2019			2018
Balance as of January 1,	$	9,599		$	9,089
Goodwill acquired (a)	4,962			410
Other adjustments(b)	(275		)	(64		)
Balance at September 30,	$	14,286		$	9,435

^(a) Primarily reflects $4.8 billion from the acquisition of JLT in 2019.

^(b) Primarily reflects the impact of foreign exchange.

Amortized Intangible Assets

The gross cost and accumulated amortization of identified intangible assets at September 30, 2019 and December 31, 2018 are as follows:

	September 30, 2019						December 31, 2018
(In millions)	Gross Cost		Accumulated Amortization		Net Carrying Amount		Gross Cost		Accumulated Amortization		Net Carrying Amount
Client Relationships	$	3,526	$	824	$	2,702	$	1,970	$	639	$	1,331
Other (a)	364		197		167		259		153		106
Amortized intangibles	$	3,890	$	1,021	$	2,869	$	2,229	$	792	$	1,437

^(a) Primarily non-compete agreements, trade names and developed technology.

Estimated Future Aggregate Amortization Expense

The estimated future aggregate amortization expense is as follows:

For the Years Ending December 31,
(In millions)	Estimated Expense
2019 (excludes amortization through September 30, 2019)	$	95
2020	354
2021	343
2022	327
2023	320
Subsequent years	1,430
	$	2,869