Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Goodwill and intangible asset impairment	$ 0	$ 0	$ 0
Amortization of other intangible assets	$ 239,000,000	$ 238,000,000	$ 245,000,000
Client relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life of intangible assets	5 years
Client relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life of intangible assets	20 years
Technology | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life of intangible assets	3 years
Technology | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life of intangible assets	10 years
Core deposits | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life of intangible assets	16 years
Core deposits | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life of intangible assets	22 years