Securitizations and Variable Interest Entities (Schedule of Cash Flows with Nonconsolidated Special-Purpose Entities) (Details) - Off-balance sheet variable interest entities - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash Flow Received and Paid to Nonconsolidated Securitization Entities [Line Items]
Total	$ 1,319	$ 296
Automotive | Consumer
Cash Flow Received and Paid to Nonconsolidated Securitization Entities [Line Items]
Cash proceeds from transfers completed during the period	1,281	252
Servicing fees	14	2
Cash flows received on retained interests in securitization entities	9	0
Other cash flows	1	0
Consumer other | Consumer
Cash Flow Received and Paid to Nonconsolidated Securitization Entities [Line Items]
Cash proceeds from transfers completed during the period	12	39
Servicing fees	$ 2	$ 3