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Deposits and Borrowings - Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total long-term debt	$ 39,871	$ 48,383
Total short-term borrowings and long-term debt	40,539	55,697
EUR denominated unsecured notes	27,382	30,472
Euro
Debt Instrument [Line Items]
EUR denominated unsecured notes	$ 1,600	1,400
Securitized debt obligations
Debt Instrument [Line Items]
Weighted average interest rate	1.87%
Carrying value	$ 12,414	17,808
Total senior and subordinated notes
Debt Instrument [Line Items]
Carrying value	$ 27,382	30,472
Senior notes | Total unsecured senior debt
Debt Instrument [Line Items]
Weighted average interest rate	3.08%
Carrying value	$ 22,654	25,997
Senior notes | Fixed unsecured senior debt
Debt Instrument [Line Items]
Weighted average interest rate	3.24%
Carrying value	$ 21,045	23,302
Senior notes | Floating unsecured senior debt
Debt Instrument [Line Items]
Weighted average interest rate	0.97%
Carrying value	$ 1,609	2,695
Subordinated notes | Fixed unsecured subordinated debt
Debt Instrument [Line Items]
Weighted average interest rate	3.78%
Carrying value	$ 4,728	4,475
Finance lease liabilities
Debt Instrument [Line Items]
Weighted average interest rate	3.78%
Carrying value	$ 75	103
Total other long-term borrowings
Debt Instrument [Line Items]
Carrying value	$ 75	$ 103
Minimum | Securitized debt obligations
Debt Instrument [Line Items]
Stated interest rates	0.51%
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	0.64%
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	0.68%
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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