Securitizations and Variable Interest Entities (Schedule of Variable Interest Entities) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Carrying value of total assets	$ 191,826	$ 182,114	$ 182,165
Carrying value of total liabilities	178,967	165,064
Non-recourse debt	17,762	17,029
Other assets	9,138	8,057
On-balance sheet variable interest entities
Variable Interest Entity [Line Items]
Carrying value of total assets	9,856	7,509
Carrying value of total liabilities	2,441	1,339
Non-recourse debt	2,436	1,337
Other assets	645	563
On-balance sheet variable interest entities | Consumer | Automotive
Variable Interest Entity [Line Items]
Carrying value of total assets	20,415	18,158
Carrying value of total liabilities	2,553	1,162
Assets sold to nonconsolidated VIEs	0	0
Maximum exposure to loss in nonconsolidated VIEs	0	0
Assets held-in-trust	10,600	11,000
On-balance sheet variable interest entities | Consumer | Automotive | Nonrecourse
Variable Interest Entity [Line Items]
Non-recourse debt	113	124
On-balance sheet variable interest entities | Consumer | Other
Variable Interest Entity [Line Items]
Carrying value of total assets		318
Carrying value of total liabilities		300
Assets sold to nonconsolidated VIEs		0
Maximum exposure to loss in nonconsolidated VIEs		0
Off-balance sheet variable interest entities
Variable Interest Entity [Line Items]
Carrying value of total assets	22,614	20,290
Carrying value of total liabilities	3,426	2,188
Assets sold to nonconsolidated VIEs	330	0
Maximum exposure to loss in nonconsolidated VIEs	3,097	2,416
Off-balance sheet variable interest entities | Consumer | Automotive
Variable Interest Entity [Line Items]
Carrying value of total assets	0
Carrying value of total liabilities	0
Assets sold to nonconsolidated VIEs	227
Maximum exposure to loss in nonconsolidated VIEs	227
Off-balance sheet variable interest entities | Consumer | Other
Variable Interest Entity [Line Items]
Carrying value of total assets	0
Carrying value of total liabilities	0
Assets sold to nonconsolidated VIEs	103
Maximum exposure to loss in nonconsolidated VIEs	103
Off-balance sheet variable interest entities | Commercial | Other
Variable Interest Entity [Line Items]
Carrying value of total assets	2,199	1,814
Carrying value of total liabilities	873	726
Assets sold to nonconsolidated VIEs	0	0
Maximum exposure to loss in nonconsolidated VIEs	2,767	2,416
Other assets	$ 38	$ 8