Reserves for Credit Losses - Key Variables (Details)	Jun. 30, 2024	Dec. 31, 2023
U.S. Unemployment Rate | Second quarter of 2024
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, reserves for credit losses, measurement input	0.04
U.S. Unemployment Rate | Minimum | Second quarter of 2024
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 2024
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, reserves for credit losses, measurement input	0.03	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	0.03	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	0.03	0.03
U.S. Unemployment Rate | Maximum | Second quarter of 2024
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, reserves for credit losses, measurement input		0.07
U.S. Unemployment Rate | Maximum | Fourth quarter of 2024
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, reserves for credit losses, measurement input	0.07	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	0.08	0.07
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	0.06	0.06
U.S. GDP Growth (Contraction) | Second quarter of 2024
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, reserves for credit losses, measurement input	0.02
U.S. GDP Growth (Contraction) | Fourth quarter of 2025
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, reserves for credit losses, measurement input		0.02
U.S. GDP Growth (Contraction) | Minimum | Second quarter of 2024
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 2024
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, reserves for credit losses, measurement input	(0.04)	0.01
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	0.01
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	0.02	0.02
U.S. GDP Growth (Contraction) | Maximum | Second quarter of 2024
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 2024
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, reserves for credit losses, measurement input	0.04	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	0.02
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		0.03