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Regulatory Capital - Narrative (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2020 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022 | Mar. 31, 2023 | Jan. 01, 2023 | Mar. 31, 2022 | Jan. 01, 2022 | Dec. 31, 2021
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses |  | $ 1,364,716,000 | $ 1,081,066,000 | $ 1,364,716,000 | $ 1,081,066,000 | $ 1,357,075,000 | $ 1,479,306,000 |  | $ 1,227,362,000 |  | $ 1,165,335,000
Liability for unfunded commitments |  | 62,600,000 | 113,525,000 | 62,600,000 | 113,525,000 | 124,924,000 | $ 32,720,000 |  | $ 32,707,000 |  | $ 72,713,000
Unrealized loss |  |  |  | 145,000,000 |  | 160,000,000 |  |  |  |  |
Unrealized loss, tax benefit |  |  |  | 46,000,000 |  | $ 52,000,000 |  |  |  |  |
Dividends |  | $ 300,000,000 | $ 293,000,000 | $ 300,000,000 | $ 401,000,000 |  |  |  |  |  |
Accounting Standards Update 2016-13 |  |  |  |  |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Period of deferment | 2 years |  |  |  |  |  |  |  |  |  |
Percentage amount deferred per year | 25.00% |  |  |  |  |  |  |  |  |  |
Percentage amount phased in during year |  |  |  |  |  |  |  | 25.00% |  | 25.00% |
Allowance for credit losses | $ 1,100,000,000 |  |  |  |  |  |  |  |  |  |
Liability for unfunded commitments | 116,000,000 |  |  |  |  |  |  |  |  |  |
Deferred tax asset | 306,000,000 |  |  |  |  |  |  |  |  |  |
Reduction to retained earnings | $ 953,000,000 |  |  |  |  |  |  |  |  |  |

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