Other Assets (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other Assets [Line Items]
Accumulated goodwill impairment losses	$ 221	$ 221
Gross carrying amount	717	720
Accumulated amortization	619	574
Amortization expense	49	51	$ 57
Expected amortization expense in 2024	44
Expected amortization expense in 2025	21
Expected amortization expense in 2026	11
Expected amortization expense in 2027	9
Expected amortization expense in 2028	4
Expected amortization expense thereafter	8
Tax credit investments	1,369	1,207
Tax credit investments unfunded commitment	$ 573
Earliest Year
Other Assets [Line Items]
Tax credit investments commitment, year to be paid	2024
Latest Year
Other Assets [Line Items]
Tax credit investments commitment, year to be paid	2040
Variable Interest Entity, Primary Beneficiary
Other Assets [Line Items]
Tax credit investments	$ 1,126	$ 1,042
Tax credit investments unfunded commitment	409
Variable Interest Entity, Primary Beneficiary | Off-Balance Sheet Obligations
Other Assets [Line Items]
Tax credit investments off balance sheet obligation	$ 3
Minimum
Other Assets [Line Items]
Estimated useful lives	1 year
Maximum
Other Assets [Line Items]
Estimated useful lives	22 years