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Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)	Dec. 31, 2023	Oct. 01, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Line Items]
Goodwill	$ 2,752,000,000		$ 2,752,000,000	$ 2,693,000,000
Expected deductible goodwill for tax purpose	359,000,000
Accumulated impairment loss	0		$ 0	$ 0
Commercial Bank
Goodwill [Line Items]
Goodwill	800,000,000
Percentage of estimated fair value in excess of carrying amount		31.00%
Institutional Bank
Goodwill [Line Items]
Goodwill	$ 133,000,000
Percentage of estimated fair value in excess of carrying amount		7.00%
Consumer Bank
Goodwill [Line Items]
Percentage of estimated fair value in excess of carrying amount		31.00%

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