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Loans and Related Allowance for Credit Losses (Narrative) (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 USD ($) portfolio_segment | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($)
Number of portfolio segments | portfolio_segment | 2 |  |
Financing receivable, threshold period past due, subsequently defaulted | 60 days |  |
Allowance for credit loss | $ 5,197 | $ 5,221 |
Decrease in allowance for credit loss | 300 |  |
Performing Financial Instruments |  |  |
Troubled debt restructurings (TDRs) | 600 |  | $ 600
TDRs |  |  |
Amortized Cost - Subsequently Defaulted TDRs | 9 | $ 15 |
TDRs | Nonperforming loans |  |  |
Troubled debt restructurings (TDRs) | 900 |  | 1,000
Federal Reserve Bank |  |  |
Loans pledged as collateral for the ability to borrow | 25,000 |  | 25,700
Federal Home Loan Bank |  |  |
Loans pledged as collateral for the ability to borrow | $ 87,300 |  | $ 66,200

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