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Deposits and Borrowings - Long-Term Debt (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total long-term debt	$ 37,608	$ 39,871
Total short-term borrowings and long-term debt	38,450	40,539
EUR denominated unsecured notes	25,467	27,382
Euro
Debt Instrument [Line Items]
EUR denominated unsecured notes	$ 1,500	1,600
Securitized debt obligations
Debt Instrument [Line Items]
Weighted average interest rate	1.86%
Carrying value	$ 12,071	12,414
Total senior and subordinated notes
Debt Instrument [Line Items]
Carrying value	$ 25,467	27,382
Senior notes | Total unsecured senior debt
Debt Instrument [Line Items]
Weighted average interest rate	3.06%
Carrying value	$ 20,837	22,654
Senior notes | Fixed unsecured senior debt
Debt Instrument [Line Items]
Weighted average interest rate	3.20%
Carrying value	$ 19,478	21,045
Senior notes | Floating unsecured senior debt
Debt Instrument [Line Items]
Weighted average interest rate	1.12%
Carrying value	$ 1,359	1,609
Subordinated notes | Fixed unsecured subordinated debt
Debt Instrument [Line Items]
Weighted average interest rate	3.78%
Carrying value	$ 4,630	4,728
Finance lease liabilities
Debt Instrument [Line Items]
Weighted average interest rate	3.82%
Carrying value	$ 70	75
Total other long-term borrowings
Debt Instrument [Line Items]
Carrying value	$ 70	$ 75
Minimum | Securitized debt obligations
Debt Instrument [Line Items]
Stated interest rates	0.46%
Minimum | Senior notes | Fixed unsecured senior debt
Debt Instrument [Line Items]
Stated interest rates	0.80%
Minimum | Senior notes | Floating unsecured senior debt
Debt Instrument [Line Items]
Stated interest rates	0.93%
Minimum | Subordinated notes | Fixed unsecured subordinated debt
Debt Instrument [Line Items]
Stated interest rates	3.38%
Minimum | Finance lease liabilities
Debt Instrument [Line Items]
Stated interest rates	0.26%
Maximum | Securitized debt obligations
Debt Instrument [Line Items]
Stated interest rates	3.01%
Maximum | Senior notes | Fixed unsecured senior debt
Debt Instrument [Line Items]
Stated interest rates	4.75%
Maximum | Senior notes | Floating unsecured senior debt
Debt Instrument [Line Items]
Stated interest rates	1.36%
Maximum | Subordinated notes | Fixed unsecured subordinated debt
Debt Instrument [Line Items]
Stated interest rates	4.20%
Maximum | Finance lease liabilities
Debt Instrument [Line Items]
Stated interest rates	9.91%

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