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Finance Receivables and Loans, Net (Schedule of Purchases of Financing Receivables and Loans) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables and loans, significant purchases | $ 2,506 | $ 899 | $ 3,350 | $ 2,233
Consumer portfolio segment | Automotive loan |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables and loans, significant purchases | 635 | 218 | 995 | 317
Consumer portfolio segment | Real estate-backed loan |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables and loans, significant purchases | 1,870 | 678 | 2,354 | 1,913
Commercial portfolio segment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables and loans, significant purchases | $ 1 | $ 3 | $ 1 | $ 3

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