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v3.21.1

Loans and Related Allowance for Credit Losses (Narrative) (Details) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 USD ($) portfolio_segment | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Number of portfolio segments | portfolio_segment | 2 |  |  |
Allowance for credit loss | $ 5,221 | $ 4,394 | $ 5,945 | $ 3,060
Increase (decrease) in allowance for credit loss | (700) | 1,300 |  |
Performing Financial Instruments |  |  |  |
Troubled debt restructurings (TDRs) | 700 |  | 700 |
TDRs |  |  |  |
Amortized Cost - Subsequently Defaulted TDRs | 15 | $ 29 |  |
TDRs | Nonperforming loans |  |  |  |
Troubled debt restructurings (TDRs) | 900 |  | 900 |
Federal Reserve Bank |  |  |  |
Loans pledged as collateral for the ability to borrow | 28,600 |  | 30,100 |
Federal Home Loan Bank |  |  |  |
Loans pledged as collateral for the ability to borrow | $ 66,900 |  | $ 69,000 |

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