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Finance Receivables and Loans, Net (Schedule of Average Balance and Interest Income of Impaired Finance Receivables) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019
Financing Receivable, Impaired [Line Items] |  |
Impaired Financing Receivable, Average Recorded Investment | $ 948 | $ 990
Impaired Financing Receivable, Interest Income, Accrual Method | 11 | 23
Consumer portfolio segment |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Financing Receivable, Average Recorded Investment | 721 | 724
Impaired Financing Receivable, Interest Income, Accrual Method | 11 | 22
Commercial portfolio segment |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Financing Receivable, Average Recorded Investment | 227 | 266
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 1
Automotive loan | Consumer portfolio segment |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Financing Receivable, Average Recorded Investment | 498 | 498
Impaired Financing Receivable, Interest Income, Accrual Method | 9 | 17
Automotive loan | Commercial portfolio segment |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Financing Receivable, Average Recorded Investment | 113 | 143
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 1
Other loan | Commercial portfolio segment |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Financing Receivable, Average Recorded Investment | 108 | 117
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0
Real estate-backed loan | Consumer portfolio segment |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Financing Receivable, Average Recorded Investment | 223 | 226
Impaired Financing Receivable, Interest Income, Accrual Method | 2 | 5
Real estate-backed loan | Commercial portfolio segment |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Financing Receivable, Average Recorded Investment | 6 | 6
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0
Mortgage Finance operations | Consumer portfolio segment |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Financing Receivable, Average Recorded Investment | 14 | 15
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0
Mortgage - Legacy | Consumer portfolio segment |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Financing Receivable, Average Recorded Investment | 209 | 211
Impaired Financing Receivable, Interest Income, Accrual Method | $ 2 | $ 5

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