Reserves for Credit Losses (Details)	Jun. 30, 2021	Dec. 31, 2020
U.S. Unemployment Rate | Second quarter of 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, reserves for credit losses, measurement input	0.06
U.S. Unemployment Rate | Minimum | Second quarter of 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, reserves for credit losses, measurement input		0.08
U.S. Unemployment Rate | Minimum | Fourth quarter of 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, reserves for credit losses, measurement input	0.04	0.07
U.S. Unemployment Rate | Minimum | Fourth quarter of 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, reserves for credit losses, measurement input	0.04	0.06
U.S. Unemployment Rate | Minimum | Fourth quarter of 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, reserves for credit losses, measurement input	0.03	0.04
U.S. Unemployment Rate | Maximum | Second quarter of 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, reserves for credit losses, measurement input		0.10
U.S. Unemployment Rate | Maximum | Fourth quarter of 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, reserves for credit losses, measurement input	0.08	0.11
U.S. Unemployment Rate | Maximum | Fourth quarter of 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, reserves for credit losses, measurement input	0.09	0.12
U.S. Unemployment Rate | Maximum | Fourth quarter of 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, reserves for credit losses, measurement input	0.07	0.10
U.S. GDP Growth (Contraction) | Second quarter of 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, reserves for credit losses, measurement input	0.11
U.S. GDP Growth (Contraction) | Fourth quarter of 2022
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 2021
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 2021
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) | Minimum | Fourth quarter of 2022
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 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, reserves for credit losses, measurement input	0.03	0.05
U.S. GDP Growth (Contraction) | Maximum | Second quarter of 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, reserves for credit losses, measurement input		(0.04)
U.S. GDP Growth (Contraction) | Maximum | Fourth quarter of 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, reserves for credit losses, measurement input	(0.03)	(0.02)
U.S. GDP Growth (Contraction) | Maximum | Fourth quarter of 2022
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 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, reserves for credit losses, measurement input	0.02	0.03