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Deposits and Borrowings - Long-Term Debt (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total long-term debt	$ 49,282	$ 48,383
Total short-term borrowings and long-term debt	55,681	55,697
EUR denominated unsecured notes	32,049	30,472
Euro
Debt Instrument [Line Items]
EUR denominated unsecured notes	$ 1,400	1,400
Securitized debt obligations
Debt Instrument [Line Items]
Weighted average interest rate	2.00%
Carrying value	$ 17,141	17,808
Total senior and subordinated notes
Debt Instrument [Line Items]
Carrying value	$ 32,049	30,472
Senior notes | Total unsecured senior debt
Debt Instrument [Line Items]
Weighted average interest rate	2.98%
Carrying value	$ 27,306	25,997
Senior notes | Fixed unsecured senior debt
Debt Instrument [Line Items]
Weighted average interest rate	3.04%
Carrying value	$ 24,610	23,302
Senior notes | Floating unsecured senior debt
Debt Instrument [Line Items]
Weighted average interest rate	2.42%
Carrying value	$ 2,696	2,695
Subordinated notes | Fixed unsecured subordinated debt
Debt Instrument [Line Items]
Weighted average interest rate	3.78%
Carrying value	$ 4,743	4,475
Finance lease liabilities
Debt Instrument [Line Items]
Weighted average interest rate	3.64%
Carrying value	$ 92	103
Total other long-term borrowings
Debt Instrument [Line Items]
Carrying value	$ 92	$ 103
Minimum | Securitized debt obligations
Debt Instrument [Line Items]
Stated interest rates	1.05%
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	1.95%
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	1.63%
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	2.92%
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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