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Business Combinations - Schedule of Business Acquisitions (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 03, 2022 | Jun. 30, 2022 | Jun. 30, 2022 | Jun. 30, 2021
Liabilities |  |  |  |
Gain on acquisition |  | $ 0 | $ 431 | $ 0
CIT Group Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Consideration for stock-based compensation | $ 81 |  |  |
Cash in lieu of fractional shares and other consideration paid | 51 |  |  |
Purchase price consideration | 5,952 |  |  |
Assets |  |  |  |
Cash and interest-earning deposits at banks | 3,060 |  |  |
Investment securities | 6,561 |  |  |
Assets held for sale | 59 |  |  |
Loans and leases | 32,714 |  |  |
Operating lease equipment | 7,838 |  |  |
Bank-owned life insurance | 1,202 |  |  |
Intangible assets | 143 |  |  |
Other assets | 2,198 |  |  |
Total assets acquired | 53,775 |  |  |
Liabilities |  |  |  |
Deposits | 39,428 |  |  |
Borrowings | 4,536 |  |  |
Credit balances of factoring clients | 1,534 |  |  |
Other liabilities | 1,894 |  |  |
Total liabilities assumed | 47,392 |  |  |
Fair value of net assets acquired | 6,383 |  |  |
Gain on acquisition | $ 431 |  |  |
CIT Group Inc. | Class A Common Stock, Par Value $1 |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Shares of BancShares Class A common stock issued (in shares) | 6,140,010 |  |  |
Price per share on January 3, 2022 (in dollars per share) | $ 859.76 |  |  |
Consideration for common stock and preferred stock | $ 5,279 |  |  |
CIT Group Inc. | Preferred Stock |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Consideration for common stock and preferred stock | $ 541 |  |  |

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