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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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