Loans - Summary of Loans (Detail) - USD ($) |
1 Months Ended | 3 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Loans Receivable [Line Items] | |||||
| Total loans, gross | $ 239,882,000,000 | $ 239,882,000,000 | $ 239,882,000,000 | $ 200,866,000,000 | |
| Fair Value | 4,905,000,000 | 4,905,000,000 | 4,905,000,000 | 5,460,000,000 | |
| Held For Sale | 22,066,000,000 | 22,066,000,000 | 22,066,000,000 | 3,525,000,000 | |
| Allowance for loan losses | (2,148,000,000) | (2,148,000,000) | (2,148,000,000) | (4,666,000,000) | $ (5,050,000,000) |
| Total loans | 237,734,000,000 | 237,734,000,000 | 237,734,000,000 | 196,200,000,000 | |
| Loans sold | 425,000,000 | 4,440,000,000 | |||
| Reduction in loan loss reserves | 2,460,000,000 | 330,000,000 | |||
| Seller Financing Loan Portfolio | |||||
| Loans Receivable [Line Items] | |||||
| Loans sold | 0 | ||||
| GreenSky | |||||
| Loans Receivable [Line Items] | |||||
| Loans sold | 3,690,000,000 | ||||
| GM | |||||
| Loans Receivable [Line Items] | |||||
| Loans sold | 1,540,000,000 | ||||
| Apple Card Loans | |||||
| Loans Receivable [Line Items] | |||||
| Total loans | 19,740,000,000 | 19,740,000,000 | 19,740,000,000 | ||
| Loans transferred to held-for-sale | 21,260,000,000 | ||||
| Reduction in loan loss reserves | 2,480,000,000 | 2,480,000,000 | |||
| Decrease in loan revenue | 2,260,000,000 | 2,260,000,000 | |||
| Amortized Cost | |||||
| Loans Receivable [Line Items] | |||||
| Total loans, gross | 212,911,000,000 | 212,911,000,000 | 212,911,000,000 | 191,881,000,000 | |
| Allowance for loan losses | (2,148,000,000) | (2,148,000,000) | (2,148,000,000) | (4,666,000,000) | |
| Total loans | 210,763,000,000 | 210,763,000,000 | 210,763,000,000 | 187,215,000,000 | |
| Fair Value | |||||
| Loans Receivable [Line Items] | |||||
| Fair Value | 4,905,000,000 | 4,905,000,000 | 4,905,000,000 | 5,460,000,000 | |
| Allowance for loan losses | 0 | 0 | 0 | 0 | |
| Total loans | 4,905,000,000 | 4,905,000,000 | 4,905,000,000 | 5,460,000,000 | |
| Held For Sale | |||||
| Loans Receivable [Line Items] | |||||
| Held For Sale | 22,066,000,000 | 22,066,000,000 | 22,066,000,000 | 3,525,000,000 | |
| Allowance for loan losses | 0 | 0 | 0 | 0 | |
| Total loans | 22,066,000,000 | 22,066,000,000 | 22,066,000,000 | 3,525,000,000 | |
| Corporate | |||||
| Loans Receivable [Line Items] | |||||
| Total loans, gross | 30,676,000,000 | 30,676,000,000 | 30,676,000,000 | 29,972,000,000 | |
| Fair Value | 326,000,000 | 326,000,000 | 326,000,000 | 467,000,000 | |
| Corporate | Amortized Cost | |||||
| Loans Receivable [Line Items] | |||||
| Total loans, gross | 29,432,000,000 | 29,432,000,000 | 29,432,000,000 | 28,689,000,000 | |
| Corporate | Fair Value | |||||
| Loans Receivable [Line Items] | |||||
| Fair Value | 326,000,000 | 326,000,000 | 326,000,000 | 467,000,000 | |
| Corporate | Held For Sale | |||||
| Loans Receivable [Line Items] | |||||
| Held For Sale | 918,000,000 | 918,000,000 | 918,000,000 | 816,000,000 | |
| Commercial real estate | |||||
| Loans Receivable [Line Items] | |||||
| Total loans, gross | 37,409,000,000 | 37,409,000,000 | 37,409,000,000 | 29,789,000,000 | |
| Fair Value | 420,000,000 | 420,000,000 | 420,000,000 | 424,000,000 | |
| Commercial real estate | Amortized Cost | |||||
| Loans Receivable [Line Items] | |||||
| Total loans, gross | 36,261,000,000 | 36,261,000,000 | 36,261,000,000 | 28,899,000,000 | |
| Commercial real estate | Fair Value | |||||
| Loans Receivable [Line Items] | |||||
| Fair Value | 420,000,000 | 420,000,000 | 420,000,000 | 424,000,000 | |
| Commercial real estate | Held For Sale | |||||
| Loans Receivable [Line Items] | |||||
| Held For Sale | 728,000,000 | 728,000,000 | 728,000,000 | 466,000,000 | |
| Residential real estate | |||||
| Loans Receivable [Line Items] | |||||
| Total loans, gross | 31,957,000,000 | 31,957,000,000 | 31,957,000,000 | 25,969,000,000 | |
| Fair Value | 3,257,000,000 | 3,257,000,000 | 3,257,000,000 | 3,726,000,000 | |
| Residential real estate | Amortized Cost | |||||
| Loans Receivable [Line Items] | |||||
| Total loans, gross | 28,700,000,000 | 28,700,000,000 | 28,700,000,000 | 22,243,000,000 | |
| Residential real estate | Fair Value | |||||
| Loans Receivable [Line Items] | |||||
| Fair Value | 3,257,000,000 | 3,257,000,000 | 3,257,000,000 | 3,726,000,000 | |
| Residential real estate | Held For Sale | |||||
| Loans Receivable [Line Items] | |||||
| Held For Sale | 0 | 0 | 0 | 0 | |
| Securities-based | |||||
| Loans Receivable [Line Items] | |||||
| Total loans, gross | 18,079,000,000 | 18,079,000,000 | 18,079,000,000 | 16,477,000,000 | |
| Securities-based | Amortized Cost | |||||
| Loans Receivable [Line Items] | |||||
| Total loans, gross | 18,079,000,000 | 18,079,000,000 | 18,079,000,000 | 16,477,000,000 | |
| Securities-based | Fair Value | |||||
| Loans Receivable [Line Items] | |||||
| Fair Value | 0 | 0 | 0 | 0 | |
| Securities-based | Held For Sale | |||||
| Loans Receivable [Line Items] | |||||
| Held For Sale | 0 | 0 | 0 | 0 | |
| Other collateralized | |||||
| Loans Receivable [Line Items] | |||||
| Total loans, gross | 98,999,000,000 | 98,999,000,000 | 98,999,000,000 | 75,107,000,000 | |
| Fair Value | 855,000,000 | 855,000,000 | 855,000,000 | 783,000,000 | |
| Other collateralized | Amortized Cost | |||||
| Loans Receivable [Line Items] | |||||
| Total loans, gross | 97,519,000,000 | 97,519,000,000 | 97,519,000,000 | 74,008,000,000 | |
| Other collateralized | Fair Value | |||||
| Loans Receivable [Line Items] | |||||
| Fair Value | 855,000,000 | 855,000,000 | 855,000,000 | 783,000,000 | |
| Other collateralized | Held For Sale | |||||
| Loans Receivable [Line Items] | |||||
| Held For Sale | 625,000,000 | 625,000,000 | 625,000,000 | 316,000,000 | |
| Credit cards | |||||
| Loans Receivable [Line Items] | |||||
| Total loans, gross | 19,742,000,000 | 19,742,000,000 | 19,742,000,000 | 21,403,000,000 | |
| Credit cards | Amortized Cost | |||||
| Loans Receivable [Line Items] | |||||
| Total loans, gross | 0 | 0 | 0 | 19,615,000,000 | |
| Credit cards | Fair Value | |||||
| Loans Receivable [Line Items] | |||||
| Fair Value | 0 | 0 | 0 | 0 | |
| Credit cards | Held For Sale | |||||
| Loans Receivable [Line Items] | |||||
| Held For Sale | 19,742,000,000 | 19,742,000,000 | 19,742,000,000 | 1,788,000,000 | |
| Other | |||||
| Loans Receivable [Line Items] | |||||
| Total loans, gross | 3,020,000,000 | 3,020,000,000 | 3,020,000,000 | 2,149,000,000 | |
| Fair Value | 47,000,000 | 47,000,000 | 47,000,000 | 60,000,000 | |
| Other | Amortized Cost | |||||
| Loans Receivable [Line Items] | |||||
| Total loans, gross | 2,920,000,000 | 2,920,000,000 | 2,920,000,000 | 1,950,000,000 | |
| Other | Fair Value | |||||
| Loans Receivable [Line Items] | |||||
| Fair Value | 47,000,000 | 47,000,000 | 47,000,000 | 60,000,000 | |
| Other | Held For Sale | |||||
| Loans Receivable [Line Items] | |||||
| Held For Sale | 53,000,000 | 53,000,000 | 53,000,000 | 139,000,000 | |
| Installment | |||||
| Loans Receivable [Line Items] | |||||
| Total loans, gross | $ 22,000,000 | $ 22,000,000 | $ 22,000,000 | $ 70,000,000 | |