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Finance Receivables and Loans, Net (Past Due Financing Receivables and Loans) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due $ 2,066 $ 2,759  
Financing Receivable, Recorded Investment, Current 116,936 116,185  
Loans and Leases Receivable, Gross 119,002 118,944 $ 110,876
Consumer Portfolio Segment [Member] | Consumer Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 2,060 2,749  
Financing Receivable, Recorded Investment, Current 74,540 74,094  
Loans and Leases Receivable, Gross 76,600 76,843  
Consumer Portfolio Segment [Member] | Automobile Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 1,917 2,580  
Financing Receivable, Recorded Investment, Current 63,746 63,213  
Loans and Leases Receivable, Gross 65,663 65,793 63,013
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 143 169  
Financing Receivable, Recorded Investment, Current 10,794 10,881  
Loans and Leases Receivable, Gross 10,937 11,050 10,675
Consumer Portfolio Segment [Member] | Mortgage Finance [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 39 49  
Financing Receivable, Recorded Investment, Current 8,292 8,245  
Loans and Leases Receivable, Gross 8,331 8,294  
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 104 120  
Financing Receivable, Recorded Investment, Current 2,502 2,636  
Loans and Leases Receivable, Gross 2,606 2,756  
Commercial Portfolio Segment [Member] | Commercial Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 6 10  
Financing Receivable, Recorded Investment, Current 42,396 42,091  
Loans and Leases Receivable, Gross 42,402 42,101 $ 37,188
Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 6 10  
Financing Receivable, Recorded Investment, Current 34,905 35,031  
Loans and Leases Receivable, Gross 34,911 35,041  
Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 0 0  
Financing Receivable, Recorded Investment, Current 3,499 3,248  
Loans and Leases Receivable, Gross 3,499 3,248  
Commercial Portfolio Segment [Member] | Commercial Real Estate Automobile [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 0 0  
Financing Receivable, Recorded Investment, Current 3,992 3,812  
Loans and Leases Receivable, Gross 3,992 3,812  
Financing Receivables, 30 to 59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 1,409 1,937  
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Consumer Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 1,409 1,934  
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 1,346 1,850  
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Residential Mortgage [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 63 84  
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Mortgage Finance [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 30 39  
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 33 45  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 0 3  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 0 3  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 0 0  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Real Estate Automobile [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 0 0  
Financing Receivables, 60 to 89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 324 452  
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Consumer Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 324 452  
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 308 428  
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Residential Mortgage [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 16 24  
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Mortgage Finance [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 2 6  
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 14 18  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 0 0  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 0 0  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 0 0  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Real Estate Automobile [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 0 0  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 333 370  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Consumer Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 327 363  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 263 302  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Residential Mortgage [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 64 61  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Mortgage Finance [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 7 4  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 57 57  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 6 7  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 6 7  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 0 0  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial Real Estate Automobile [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due $ 0 $ 0