Goodwill and Other Intangibles (Tables)

3 Months Ended

Mar. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in the Carrying Amount of Goodwill

Changes in the carrying amount of goodwill are as follows:

March 31,
(In millions)	2021		2020
Balance as of January 1,	$	15,517	$	14,671
Goodwill acquired	—		142
Other adjustments(a)	(59)		(401)
Balance at March 31,	$	15,458	$	14,412

(a) Primarily reflects the impact of foreign exchange.

Amortized Intangible Assets

The gross cost and accumulated amortization of identified intangible assets at March 31, 2021 and December 31, 2020 are as follows:

	March 31, 2021						December 31, 2020
(In millions)	Gross Cost		Accumulated Amortization		Net Carrying Amount		Gross Cost		Accumulated Amortization		Net Carrying Amount
Client Relationships	$	3,717	$	1,260	$	2,457	$	3,713	$	1,170	$	2,543
Other (a)	387		241		146		386		230		156
Amortized intangibles	$	4,104	$	1,501	$	2,603	$	4,099	$	1,400	$	2,699

(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
2021 (excludes amortization through March 31, 2021)	$	258
2022	318
2023	293
2024	276
2025	238
Subsequent years	1,220
	$	2,603