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Finance Receivables and Loans, Net (Troubled Debt Restructurings) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Financing Receivable, Modifications [Line Items]    
Financing Receivable, Modifications, Recorded Investment $ 663 $ 625
Financing Receivable, Modifications, Number of Contracts 20,355 17,428,000,000
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 375 $ 348
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 321 $ 305
Consumer Portfolio Segment [Member] | Consumer Loan [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable, Modifications, Number of Contracts 20,354 17,426,000,000
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 368 $ 324
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 314 $ 281
Consumer Portfolio Segment [Member] | Automobile Loan [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable, Modifications, Number of Contracts 20,227 17,222,000,000
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 347 $ 278
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 293 $ 237
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable, Modifications, Number of Contracts 127 204,000,000
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 21 $ 46
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 21 $ 44
Consumer Portfolio Segment [Member] | Mortgage Finance [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable, Modifications, Number of Contracts 7 7,000,000
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 3 $ 4
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 3 $ 4
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable, Modifications, Number of Contracts 120 197,000,000
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 18 $ 42
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 18 40
Commercial Portfolio Segment [Member] | Commercial Loan [Member]    
Financing Receivable, Modifications [Line Items]    
Loans and Leases Receivable, Impaired, Commitment to Lend   $ 2
Financing Receivable, Modifications, Number of Contracts 1 2,000,000
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 7 $ 24
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 7 $ 24
Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable, Modifications, Number of Contracts 1 0
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 7 $ 0
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 7 $ 0
Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable, Modifications, Number of Contracts 0 1,000,000
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 0 $ 21
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 21
Commercial Portfolio Segment [Member] | Commercial Real Estate Automobile [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable, Modifications, Number of Contracts 0 1,000,000
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 0 $ 3
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 3