Securitizations and Variable Interest Entities (Schedule of Variable Interest Entities) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Variable Interest Entity [Line Items]
Carrying value of total assets	$ 196,165	$ 191,826	$ 184,297
Carrying value of total liabilities	182,787	178,967
Assets sold to nonconsolidated VIEs	579	330
Maximum exposure to loss in nonconsolidated VIEs	3,346	3,097
Non-recourse debt	20,480	17,762
Equity securities	718	681
On-balance sheet variable interest entities
Variable Interest Entity [Line Items]
Carrying value of total assets	11,752	9,856
Carrying value of total liabilities	3,051	2,441
Non-recourse debt	3,043	2,436
On-balance sheet variable interest entities | Consumer | Automotive
Variable Interest Entity [Line Items]
Carrying value of total assets	22,126	20,415
Carrying value of total liabilities	3,162	2,553
Assets sold to nonconsolidated VIEs	0	0
Maximum exposure to loss in nonconsolidated VIEs	0	0
Assets held-in-trust	10,400	10,600
On-balance sheet variable interest entities | Consumer | Automotive | Nonrecourse
Variable Interest Entity [Line Items]
Non-recourse debt	111	113
Off-balance sheet variable interest entities
Variable Interest Entity [Line Items]
Carrying value of total assets	24,329	22,614
Carrying value of total liabilities	4,026	3,426
Off-balance sheet variable interest entities | Consumer | Automotive
Variable Interest Entity [Line Items]
Carrying value of total assets	0	0
Carrying value of total liabilities	0	0
Assets sold to nonconsolidated VIEs	461	227
Maximum exposure to loss in nonconsolidated VIEs	461	227
Off-balance sheet variable interest entities | Consumer | Other
Variable Interest Entity [Line Items]
Carrying value of total assets	0	0
Carrying value of total liabilities	0	0
Assets sold to nonconsolidated VIEs	118	103
Maximum exposure to loss in nonconsolidated VIEs	118	103
Off-balance sheet variable interest entities | Commercial | Other
Variable Interest Entity [Line Items]
Carrying value of total assets	2,203	2,199
Carrying value of total liabilities	864	873
Assets sold to nonconsolidated VIEs	0	0
Maximum exposure to loss in nonconsolidated VIEs	2,767	2,767
Equity securities	$ 41	$ 38