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Finance Receivables and Loans, Net (Past Due Financing Receivables and Loans) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due $ 2,329 $ 2,759  
Financing Receivable, Recorded Investment, Current 118,199 116,185  
Loans and Leases Receivable, Gross 120,528 118,944 $ 112,653
Consumer Portfolio Segment [Member] | Consumer Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 2,303 2,749  
Financing Receivable, Recorded Investment, Current 75,765 74,094  
Loans and Leases Receivable, Gross 78,068 76,843  
Consumer Portfolio Segment [Member] | Automobile Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 2,155 2,580  
Financing Receivable, Recorded Investment, Current 64,619 63,213  
Loans and Leases Receivable, Gross 66,774 65,793 63,281
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 148 169  
Financing Receivable, Recorded Investment, Current 11,146 10,881  
Loans and Leases Receivable, Gross 11,294 11,050 11,084
Consumer Portfolio Segment [Member] | Mortgage Finance [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 41 49  
Financing Receivable, Recorded Investment, Current 8,825 8,245  
Loans and Leases Receivable, Gross 8,866 8,294  
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 107 120  
Financing Receivable, Recorded Investment, Current 2,321 2,636  
Loans and Leases Receivable, Gross 2,428 2,756  
Commercial Portfolio Segment [Member] | Commercial Loan [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 26 10  
Financing Receivable, Recorded Investment, Current 42,434 42,091  
Loans and Leases Receivable, Gross 42,460 42,101 $ 38,288
Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing Receivable, Recorded Investment, Past Due 26 10  
Financing Receivable, Recorded Investment, Current 34,756 35,031  
Loans and Leases Receivable, Gross 34,782 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 3,620 3,248  
Loans and Leases Receivable, Gross 3,620 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 4,058 3,812  
Loans and Leases Receivable, Gross 4,058 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 1,653 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 1,635 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 1,569 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 66 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 32 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 34 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 18 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 18 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 371 452  
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 371 452  
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 350 428  
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 21 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 3 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 18 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 305 370  
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 297 363  
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 236 302  
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 61 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 6 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 55 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 8 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 8 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