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Reserves for Credit Losses - Key Variables (Details) | Sep. 30, 2025 | Dec. 31, 2024
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U.S. Unemployment Rate | Third quarter of 2025 |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, reserves for credit losses, measurement input | 0.04 |
U.S. Unemployment Rate | Minimum | Third quarter of 2025 |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, reserves for credit losses, measurement input |  | 0.03
U.S. Unemployment Rate | Minimum | Fourth quarter of 2025 |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, reserves for credit losses, measurement input | 0.04 | 0.03
U.S. Unemployment Rate | Minimum | Fourth quarter of 2026 |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, reserves for credit losses, measurement input | 0.04 | 0.03
U.S. Unemployment Rate | Minimum | Fourth quarter of 2027 |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, reserves for credit losses, measurement input | 0.04 | 0.03
U.S. Unemployment Rate | Maximum | Third quarter of 2025 |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, reserves for credit losses, measurement input |  | 0.08
U.S. Unemployment Rate | Maximum | Fourth quarter of 2025 |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, reserves for credit losses, measurement input | 0.06 | 0.08
U.S. Unemployment Rate | Maximum | Fourth quarter of 2026 |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, reserves for credit losses, measurement input | 0.08 | 0.07
U.S. Unemployment Rate | Maximum | Fourth quarter of 2027 |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, reserves for credit losses, measurement input | 0.07 | 0.06
U.S. GDP Growth (Contraction) | Third quarter of 2025 |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, reserves for credit losses, measurement input | 0.01 |
U.S. GDP Growth (Contraction) | Fourth quarter of 2026 |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, reserves for credit losses, measurement input |  | 0.02
U.S. GDP Growth (Contraction) | Minimum | Third quarter of 2025 |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, reserves for credit losses, measurement input |  | (0.04)
U.S. GDP Growth (Contraction) | Minimum | Fourth quarter of 2025 |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, reserves for credit losses, measurement input | (0.03) | 0.01
U.S. GDP Growth (Contraction) | Minimum | Fourth quarter of 2026 |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, reserves for credit losses, measurement input | 0.01 |
U.S. GDP Growth (Contraction) | Minimum | Fourth quarter of 2027 |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, reserves for credit losses, measurement input | 0.02 | 0.02
U.S. GDP Growth (Contraction) | Maximum | Third quarter of 2025 |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, reserves for credit losses, measurement input |  | 0.03
U.S. GDP Growth (Contraction) | Maximum | Fourth quarter of 2025 |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, reserves for credit losses, measurement input | 0.05 | 0.03
U.S. GDP Growth (Contraction) | Maximum | Fourth quarter of 2026 |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, reserves for credit losses, measurement input | 0.02 |
U.S. GDP Growth (Contraction) | Maximum | Fourth quarter of 2027 |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivable, reserves for credit losses, measurement input | 0.03 | 0.04

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