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Business Combinations - Narrative (Details) $ / shares in Units, $ in Millions |  |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended |
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Apr. 04, 2023 USD ($) | Mar. 27, 2023 USD ($) $ / shares | Jan. 03, 2022 USD ($) $ / shares shares | Sep. 30, 2023 USD ($) $ / shares | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) $ / shares | Sep. 30, 2023 USD ($) $ / shares | Sep. 30, 2022 USD ($) | Dec. 31, 2022 $ / shares
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Net interest income |  |  |  | $ 1,990 | $ 795 |  | $ 4,801 | $ 2,144 |
Noninterest income |  |  |  | 615 | 433 |  | 11,532 | 1,707 |
Net income |  |  |  | 752 | 315 |  | 10,952 | 841 |
Gain on acquisition |  |  |  | 12 | 0 |  | 9,891 | 431 |
Operating Segments | Silicon Valley Banking |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Net interest income |  |  |  | 635 | 0 |  | 1,335 | 0 |
Noninterest income |  |  |  | 151 | 0 |  | 334 | 0 |
Net income |  |  |  | $ 157 | $ 0 |  | $ 381 | $ 0 |
SVB |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total assets acquired |  | $ 107,539 |  |  |  |  |  |  |
Loans and leases |  | 68,468 |  |  |  |  |  |  |
Cash and interest-earning deposits at banks |  | 35,310 |  |  |  |  |  |  |
Total liabilities assumed |  | 61,340 |  |  |  |  |  |  |
Deposits |  | 56,014 |  |  |  |  |  |  |
Assets acquired, discount |  | 16,450 |  |  |  |  |  |  |
Business combination, consideration transferred, liabilities incurred |  | 35,808 |  |  |  |  |  |  |
Cash settled value appreciation instrument issued and issuable |  | $ 5 |  |  |  |  |  |  |
Number of trading days |  | 2 days |  |  |  |  |  |  |
Cash settled value appreciation instrument, threshold amount (in dollars per share) | $ / shares |  | $ 582.55 |  |  |  |  |  |  |
Cash settled value appreciation instrument, maximum amount |  | $ 500 |  |  |  |  |  |  |
Payment to acquire business, value appreciation instrument exercised | $ 500 |  |  |  |  |  |  |  |
Business combination, financing receivable acquired, amount covered by share-loss agreement |  | $ 60,000 |  |  |  |  |  |  |
Business combination, financing receivable acquired, amount covered by share-loss agreement, coverage percentage for loss up to $5 billion |  | 0.00% |  |  |  |  |  |  |
Business combination, financing receivable acquired, amount covered by share-loss agreement, coverage percentage for loss in excess of $5 billion |  | $ 5,000 |  |  |  |  |  |  |
Business combination, financing receivable acquired, above threshold amount covered by share-loss agreement, percentage |  | 50.00% |  |  |  |  |  |  |
Share-Loss Agreement, reimbursement percentage |  | 50.00% |  |  |  |  |  |  |
Share-Loss Agreement, term |  | 5 years |  |  |  |  |  |  |
Share-Loss Agreement, reimbursement term |  | 8 years |  |  |  |  |  |  |
Loans funded after acquisition date, loss share term |  | 1 year |  |  |  |  |  |  |
Share-Loss Agreement, true-up payment term |  | 45 days |  |  |  |  |  |  |
True-up amount |  | $ 1,500 |  |  |  |  |  |  |
Preliminary gain on acquisition, after income taxes, period increase |  |  |  |  |  | $ 67 |  |  |
Preliminary gain on acquisition, after income taxes |  | 9,891 |  |  |  |  |  |  |
UPB |  | 71,287 |  |  |  |  |  |  |
Purchase accounting adjustment of discount |  | 2,300 |  |  |  |  |  |  |
Gain on acquisition |  | 13,172 |  |  |  |  |  |  |
SVB | Non-PCD |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Loans and leases acquired, FV |  | 66,420 |  |  |  |  |  |  |
UPB |  | $ 68,719 |  |  |  |  |  |  |
SVB | FDIC Credit Facility |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, term |  | 5 years |  |  |  |  |  |  |
FDIC advances, maximum amount available |  | $ 70,000 |  |  |  |  |  |  |
Debt instrument, period following acquisition date |  | 2 years |  |  |  |  |  |  |
FHLB, advances, interest rate |  | 0.00% |  |  |  |  |  |  |
SVB | Secured Debt | FDIC Credit Facility | Secured Overnight Financing Rate |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.25% |  |  |  |  |  |  |
SVB | Purchase Money Note | Secured Debt |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, term |  | 5 years |  |  |  |  |  |  |
Business combination, consideration transferred, liabilities incurred |  | $ 36,000 |  |  |  |  |  |  |
Debt instrument, stated interest rate |  | 3.50% |  |  |  |  |  |  |
CIT Group Inc. |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total assets acquired |  |  | $ 53,775 |  |  |  |  |  |
Loans and leases |  |  | 32,714 |  |  |  |  |  |
Cash and interest-earning deposits at banks |  |  | 3,060 |  |  |  |  |  |
Total liabilities assumed |  |  | 47,392 |  |  |  |  |  |
Deposits |  |  | 39,428 |  |  |  |  |  |
Gain on acquisition |  |  | $ 431 |  |  |  |  |  |
Class A Common Stock |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  | $ 1 |  | $ 1 | $ 1 |  | $ 1
Class A Common Stock | CIT Group Inc. |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Common stock, terms of conversion, conversion ratio |  |  | 0.062 |  |  |  |  |  |
Business acquisition, equity interest Issued or issuable (in shares) | shares |  |  | 6,140,010 |  |  |  |  |  |
CIT Group Inc. |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  | $ 0.01 |  |  |  |  |  |

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