Derivatives and Hedging Activities (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Margin on interest rate swap not netted	$ 368	$ 175
Hedged Liability, Statement of Financial Position [Extensible Enumeration]	Outstanding balance	Outstanding balance
Carrying values of hedged liabilities	$ 18,900	$ 11,700
Cumulative amount of fair value hedging adjustments	27	53
Increase (decrease) in interest expense on long term debt and other	254	189	$ (57)
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount of derivatives	28,800	25,300
Other Expense
Derivatives, Fair Value [Line Items]
Gain (loss) in changes in fair value of derivatives not designated as hedges	102	82	8
Credit Valuation Adjustment
Derivatives, Fair Value [Line Items]
Derivative, amount of hedged item	0	0
Fair Value Hedges | Fixed-Rate Debt Obligations
Derivatives, Fair Value [Line Items]
Derivative, amount of hedged item	18,900	11,700
Net Investment Hedges
Derivatives, Fair Value [Line Items]
Notional amount of derivatives	14,300	14,100
Gain (loss) on net investment hedges, net of taxes	816	(640)	237
Reclassifications out of AOCI	0	0	0
Embedded Derivative | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount of derivatives	78	78
Fair value of embedded derivative asset, gross	31	18
Embedded Derivative | Noninterest Income | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Gain (loss) on embedded derivative	$ 13	$ (9)	$ 4