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Deposits and Borrowings - Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Total long-term debt	$ 49,913	$ 44,989
Total short-term borrowings and long-term debt	51,000	45,551
Time deposits, at or above FDIC insurance limit	17,400	15,200
Deposit liability, uninsured	12,900	10,100
Senior and subordinated notes	36,001	30,696
Euro
Debt Instrument [Line Items]
Senior and subordinated notes	$ 544	473
Securitized debt obligations
Debt Instrument [Line Items]
Weighted-Average Interest Rate	3.61%
Carrying value	$ 12,853	14,264
Total senior and subordinated notes
Debt Instrument [Line Items]
Carrying value	$ 36,001	30,696
Senior notes | Fixed unsecured senior debt
Debt Instrument [Line Items]
Weighted-Average Interest Rate	5.05%
Carrying value	$ 31,335	26,930
Subordinated notes | Fixed unsecured subordinated debt
Debt Instrument [Line Items]
Weighted-Average Interest Rate	4.59%
Carrying value	$ 4,666	3,766
Total other long-term borrowings
Debt Instrument [Line Items]
Carrying value	$ 1,059	29
FHLB advances
Debt Instrument [Line Items]
Weighted-Average Interest Rate	4.38%
Carrying value	$ 1,037	0
Finance lease liabilities
Debt Instrument [Line Items]
Weighted-Average Interest Rate	5.64%
Carrying value	$ 22	$ 29
Minimum | Securitized debt obligations
Debt Instrument [Line Items]
Stated Interest Rates	1.03%
Minimum | Senior notes | Fixed unsecured senior debt
Debt Instrument [Line Items]
Stated Interest Rates	1.65%
Minimum | Subordinated notes | Fixed unsecured subordinated debt
Debt Instrument [Line Items]
Stated Interest Rates	2.36%
Minimum | FHLB advances
Debt Instrument [Line Items]
Stated Interest Rates	3.93%
Minimum | Finance lease liabilities
Debt Instrument [Line Items]
Stated Interest Rates	3.74%
Maximum | Securitized debt obligations
Debt Instrument [Line Items]
Stated Interest Rates	5.82%
Maximum | Senior notes | Fixed unsecured senior debt
Debt Instrument [Line Items]
Stated Interest Rates	7.96%
Maximum | Subordinated notes | Fixed unsecured subordinated debt
Debt Instrument [Line Items]
Stated Interest Rates	6.18%
Maximum | FHLB advances
Debt Instrument [Line Items]
Stated Interest Rates	4.82%
Maximum | Finance lease liabilities
Debt Instrument [Line Items]
Stated Interest Rates	9.91%

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