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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | [1] | Dec. 31, 2019 | [1]
--- | --- | --- | --- | --- | --- | ---
Financial Assets: |  |  |  |  |  |  |
Cash and cash equivalents, Carrying Value |  | $ 2,032 |  | $ 2,211 | [1] | $ 1,948 | $ 742
Cash and cash equivalents, Estimated Fair Value |  | 2,032 |  | 2,211 |  |  |
FHLB and FRB stock, Carrying Value | [2] | 1,267 |  |  |  |  |
FHLB and FRB stock, Estimated Fair Value | [2] | 1,267 |  |  |  |  |
FHLB stock, Carrying Value |  | 1,267 |  | 734 | [2] |  |
FHLB stock, Estimated Fair Value | [2] |  |  | 734 |  |  |
Loans and leases, net, Carrying Value |  | 68,608 |  | 45,539 |  |  |
Loans and leases, net, Estimated Fair Value |  | 65,673 |  | 44,748 |  |  |
Financial Liabilities: |  |  |  |  |  |  |
Deposits, Carrying Value |  | 58,721 |  | 35,059 |  |  |
Deposits, Estimated Fair Value |  | 58,479 |  | 35,051 |  |  |
Borrowed funds, Carrying Value |  | 21,332 |  | 16,562 |  |  |
Borrowed funds, Estimated Fair Value |  | 21,231 |  | 17,169 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |  |
Financial Assets: |  |  |  |  |  |  |
Cash and cash equivalents, Carrying Value |  | 2,032 |  | 2,211 |  |  |
Financial Liabilities: |  |  |  |  |  |  |
Deposits, Carrying Value |  | 46,211 | [3] | 26,635 | [4] |  |
Significant Other Observable Inputs (Level 2) |  |  |  |  |  |  |
Financial Assets: |  |  |  |  |  |  |
FHLB and FRB stock, Carrying Value | [5] | 1,267 |  |  |  |  |
FHLB stock, Carrying Value | [2] |  |  | 734 |  |  |
Financial Liabilities: |  |  |  |  |  |  |
Deposits, Carrying Value |  | 12,268 | [6] | 8,416 | [7] |  |
Borrowed funds, Carrying Value |  | 21,231 |  | 17,169 |  |  |
Significant Unobservable Inputs (Level 3) |  |  |  |  |  |  |
Financial Assets: |  |  |  |  |  |  |
Loans and leases, net, Carrying Value |  | $ 65,673 |  | $ 44,748 |  |  |
[1] | For further information on restricted cash, see Note 14 - Derivatives and Hedging Activities.
[2] | Carryin g value and estimated fair value are at cost.
[3] | Interest-bearing checking and money market accounts, savings accounts, and non-interest-bearing accounts.
[4] | Interest-bearing checking and money market accounts, savings accounts, and non-interest-bearing accounts.
[5] | Carrying value and estimated fair value are at cost.
[6] | Certificates of deposit.
[7] | Certificates of deposit.

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