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Deposits and Borrowings - Long-Term Debt (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total long-term debt	$ 48,383	$ 49,503
Total short-term borrowings and long-term debt	55,697	58,905
EUR denominated unsecured notes	30,472	30,826
Euro
Debt Instrument [Line Items]
EUR denominated unsecured notes	$ 1,400
Securitized debt obligations
Debt Instrument [Line Items]
Weighted average interest rate	2.22%
Carrying value	$ 17,808	18,307
Total senior and subordinated notes
Debt Instrument [Line Items]
Carrying value	$ 30,472	30,826
Senior notes | Total unsecured senior debt
Debt Instrument [Line Items]
Weighted average interest rate	3.04%
Carrying value	$ 25,997	26,283
Senior notes | Fixed unsecured senior debt
Debt Instrument [Line Items]
Weighted average interest rate	3.08%
Carrying value	$ 23,302	23,290
Senior notes | Floating unsecured senior debt
Debt Instrument [Line Items]
Weighted average interest rate	2.70%
Carrying value	$ 2,695	2,993
Subordinated notes | Fixed unsecured subordinated debt
Debt Instrument [Line Items]
Weighted average interest rate	3.78%
Carrying value	$ 4,475	4,543
FHLB advances
Debt Instrument [Line Items]
Weighted average interest rate	0.00%
Carrying value	$ 0	251
Capital lease obligation
Debt Instrument [Line Items]
Weighted average interest rate	3.73%
Carrying value	$ 103
Capital lease obligation and GPMH
Debt Instrument [Line Items]
Carrying value		119
Total other long-term borrowings
Debt Instrument [Line Items]
Carrying value	$ 103	$ 370
Minimum | Securitized debt obligations
Debt Instrument [Line Items]
Stated interest rates	1.66%
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	2.32%
Minimum | Subordinated notes | Fixed unsecured subordinated debt
Debt Instrument [Line Items]
Stated interest rates	3.38%
Minimum | FHLB advances
Debt Instrument [Line Items]
Stated interest rates	0.00%
Minimum | Capital lease obligation
Debt Instrument [Line Items]
Stated interest rates	2.20%
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	3.09%
Maximum | Subordinated notes | Fixed unsecured subordinated debt
Debt Instrument [Line Items]
Stated interest rates	4.20%
Maximum | FHLB advances
Debt Instrument [Line Items]
Stated interest rates	0.00%
Maximum | Capital lease obligation
Debt Instrument [Line Items]
Stated interest rates	12.86%

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