Goodwill and Other Intangibles (Tables)

9 Months Ended

Sep. 30, 2021

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)	2021		2020
Balance as of January 1,	$	15,517	$	14,671
Goodwill acquired	374		462
Other adjustments(a)	(243)		(99)
Balance at September 30,	$	15,648	$	15,034

(a) Primarily reflects the impact of foreign exchange.

Amortized Intangible Assets

The gross cost and accumulated amortization of identified intangible assets at September 30, 2021 and December 31, 2020 are as follows:

	September 30, 2021						December 31, 2020
(In millions)	Gross Cost		Accumulated Amortization		Net Carrying Amount		Gross Cost		Accumulated Amortization		Net Carrying Amount
Client relationships	$	3,827	$	1,331	$	2,496	$	3,713	$	1,170	$	2,543
Other (a)	367		276		91		386		230		156
Amortized intangibles	$	4,194	$	1,607	$	2,587	$	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 September 30, 2021)	$	88
2022	329
2023	302
2024	281
2025	241
Subsequent years	1,346
Total future amortization	$	2,587