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Loans and Related Allowance for Credit Losses (Narrative) (Details) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2021 USD ($) portfolio_segment | Dec. 31, 2020 USD ($) | Jun. 30, 2020 USD ($)
Number of portfolio segments | portfolio_segment | 2 |  |
Financing receivable, threshold period past due, subsequently defaulted | 60 days |  |
Allowance for credit loss | $ 6,375 |  | $ 6,590
Increase (decrease) in allowance for credit loss | 400 |  |
Performing Financial Instruments |  |  |
Troubled debt restructurings (TDRs) | 700 | $ 700 |
TDRs | Nonperforming loans |  |  |
Troubled debt restructurings (TDRs) | 800 | 900 |
Federal Reserve Bank |  |  |
Loans pledged as collateral for the ability to borrow | 45,500 | 30,100 |
Federal Home Loan Bank |  |  |
Loans pledged as collateral for the ability to borrow | $ 78,500 | $ 69,000 |

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