Debt (Details Textual)	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Line of credit maximum capacity	$ 4,000,000,000.0	$ 3,500,000,000
Fees to maintain credit lines	20,200,000	14,100,000
Interest paid	$ 6,400,000,000	2,200,000,000	$ 1,100,000,000
Minimum
Debt Instrument [Line Items]
Common equity tier one ratio	4.5
Maximum
Debt Instrument [Line Items]
Common equity tier one ratio	6.5
Short-term Debt
Debt Instrument [Line Items]
Fees to maintain credit lines	$ 12,000,000	7,800,000
Lending Trust
Debt Instrument [Line Items]
Debt term	3 years
Line of credit maximum capacity	$ 3,000,000,000
Subsidiaries
Debt Instrument [Line Items]
Line of credit maximum capacity	185,000,000	186,000,000
Amount drawn from committed lines	0	20,900,000
Charge Trust
Debt Instrument [Line Items]
Line of credit maximum capacity	$ 3,000,000,000
Debt instrument, term	3 years
Specified date face amount of eligible notes issued	Jul. 15, 2026
Amount drawn from committed lines	$ 0	$ 0