Finance Receivables and Loans, Net (Schedule of Purchases of Financing Receivables and Loans) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables and loans, significant purchases	$ 1,903	$ 1,587	$ 5,139	$ 4,937
Consumer | Automotive
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables and loans, significant purchases	709	925	2,013	1,920
Consumer | Mortgage/Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables and loans, significant purchases	1,191	659	3,123	3,013
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables and loans, significant purchases	$ 3	$ 3	$ 3	$ 4