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Goodwill and Other Intangibles (Tables)
 9 Months Ended
Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Changes in the Carrying Amount of Goodwill
Changes in the carrying amount of goodwill are as follows:
(In millions)20232022
Balance as of January 1,$16,251 $16,317 
Goodwill acquired480 139 
Other adjustments (a)
(76)(880)
Balance at September 30,
$16,655 $15,576 
(a) Primarily reflects the impact of foreign exchange.
Schedule of Amortized Intangible Assets
The gross cost and accumulated amortization of other identified intangible assets at September 30, 2023 and December 31, 2022 are as follows:
September 30, 2023December 31, 2022
(In millions)Gross
Cost		Accumulated
Amortization		Net
Carrying
Amount		Gross
Cost		Accumulated
Amortization		Net
Carrying
Amount
Client relationships$4,133 $1,683 $2,450 $3,993 $1,508 $2,485 
Other (a)
373 325 48 360 308 52 
Other intangible assets$4,506 $2,008 $2,498 $4,353 $1,816 $2,537 
(a) Primarily reflects non-compete agreements, trade names and developed technology.
Schedule of Estimated Future Aggregate Amortization Expense The estimated future aggregate amortization expense is as follows:
For the Years Ending December 31,
(In millions)
Estimated Expense
2023 (excludes amortization through September 30, 2023)
$90 
2024320 
2025286 
2026266 
2027262 
Subsequent years1,274 
 Total future amortization$2,498