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Capital Ratios (Narrative) (Details) - USD ($) $ in Billions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Capital Ratios, Basel III, Capital Conservation Buffer, Year Three | 2.50% |
Community Bank Leverage Ratio, Minimum |  | 9.00%
Consolidated asset limit on small bank holding companies | $ 3 |
Bank [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Common Equity Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum: Ratio | 6.50% |
Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum: Ratio | 8.00 |
Tier 1 Leverage Ratio: Well Capitalized Minimum: Ratio | 5.00 |
Total Risk-based Capital Ratio: Well Capitalized Minimum: Ratio | 10.00 |
Capital ratios, capital conservation buffer | 8.23% |

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