Transfers of Receivables - Assets and Liabilities of Securitizations (Details) (USD $) | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Dec. 31, 2012 |
Securitization Transactions [Line Items] | ' | ' | ' | ' | ' | ' |
Cash and cash equivalents | $7,329,000,000 | ' | $9,424,000,000 | $9,045,000,000 | ' | $9,189,000,000 |
Financing and Loans and Leases Receivable Allowance | 356,000,000 | 353,000,000 | 380,000,000 | 368,000,000 | 376,000,000 | 408,000,000 |
Finance Receivables & Net Investment In Operating Leases, After Allowance for Credit Losses | 106,113,000,000 | ' | ' | 96,074,000,000 | ' | ' |
Related Debt | 103,951,000,000 | ' | 98,693,000,000 | ' | ' | ' |
Variable Interest Entity, Primary Beneficiary [Member] | ' | ' | ' | ' | ' | ' |
Securitization Transactions [Line Items] | ' | ' | ' | ' | ' | ' |
Cash and cash equivalents | 2,022,000,000 | ' | 4,198,000,000 | ' | ' | ' |
Related Debt | 35,869,000,000 | ' | 40,728,000,000 | ' | ' | ' |
Securitization Transactions [Member] | Consolidated Entity Including Variable Interest Entities (VIE) [Member] | ' | ' | ' | ' | ' | ' |
Securitization Transactions [Line Items] | ' | ' | ' | ' | ' | ' |
Cash and cash equivalents | 2,400,000,000 | ' | 4,400,000,000 | ' | ' | ' |
Finance Receivables & Net Investment in Operating Leases, Before Allowance for Credit Losses | 55,000,000,000 | ' | 59,700,000,000 | ' | ' | ' |
Financing and Loans and Leases Receivable Allowance | 100,000,000 | ' | 200,000,000 | ' | ' | ' |
Finance Receivables & Net Investment In Operating Leases, After Allowance for Credit Losses | 54,900,000,000 | ' | 59,500,000,000 | ' | ' | ' |
Related Debt | 42,700,000,000 | ' | 45,900,000,000 | ' | ' | ' |
Securitization Transactions [Member] | Consolidated Entity Including Variable Interest Entities (VIE) [Member] | Financing Receivable [Member] | ' | ' | ' | ' | ' | ' |
Securitization Transactions [Line Items] | ' | ' | ' | ' | ' | ' |
Cash and cash equivalents | 2,000,000,000 | ' | 4,000,000,000 | ' | ' | ' |
Finance Receivables & Net Investment in Operating Leases, Before Allowance for Credit Losses | 45,100,000,000 | ' | 51,600,000,000 | ' | ' | ' |
Financing and Loans and Leases Receivable Allowance | 100,000,000 | ' | 200,000,000 | ' | ' | ' |
Finance Receivables & Net Investment In Operating Leases, After Allowance for Credit Losses | 45,000,000,000 | ' | 51,400,000,000 | ' | ' | ' |
Related Debt | 35,700,000,000 | ' | 40,300,000,000 | ' | ' | ' |
Securitization Transactions [Member] | Consolidated Entity Including Variable Interest Entities (VIE) [Member] | Retail [Member] | ' | ' | ' | ' | ' | ' |
Securitization Transactions [Line Items] | ' | ' | ' | ' | ' | ' |
Cash and cash equivalents | 1,700,000,000 | ' | 2,100,000,000 | ' | ' | ' |
Finance Receivables & Net Investment in Operating Leases, Before Allowance for Credit Losses | 24,000,000,000 | ' | 27,700,000,000 | ' | ' | ' |
Financing and Loans and Leases Receivable Allowance | 100,000,000 | ' | 200,000,000 | ' | ' | ' |
Finance Receivables & Net Investment In Operating Leases, After Allowance for Credit Losses | 23,900,000,000 | ' | 27,500,000,000 | ' | ' | ' |
Related Debt | 21,700,000,000 | ' | 24,700,000,000 | ' | ' | ' |
Securitization Transactions [Member] | Consolidated Entity Including Variable Interest Entities (VIE) [Member] | Wholesale [Member] | ' | ' | ' | ' | ' | ' |
Securitization Transactions [Line Items] | ' | ' | ' | ' | ' | ' |
Cash and cash equivalents | 300,000,000 | ' | 1,900,000,000 | ' | ' | ' |
Finance Receivables & Net Investment in Operating Leases, Before Allowance for Credit Losses | 21,100,000,000 | ' | 23,900,000,000 | ' | ' | ' |
Financing and Loans and Leases Receivable Allowance | 0 | ' | 0 | ' | ' | ' |
Finance Receivables & Net Investment In Operating Leases, After Allowance for Credit Losses | 21,100,000,000 | ' | 23,900,000,000 | ' | ' | ' |
Related Debt | 14,000,000,000 | ' | 15,600,000,000 | ' | ' | ' |
Securitization Transactions [Member] | Consolidated Entity Including Variable Interest Entities (VIE) [Member] | Net Investment in Operating Leases [Member] | ' | ' | ' | ' | ' | ' |
Securitization Transactions [Line Items] | ' | ' | ' | ' | ' | ' |
Cash and cash equivalents | 400,000,000 | ' | 400,000,000 | ' | ' | ' |
Finance Receivables & Net Investment in Operating Leases, Before Allowance for Credit Losses | 9,900,000,000 | ' | 8,100,000,000 | ' | ' | ' |
Financing and Loans and Leases Receivable Allowance | 0 | ' | 0 | ' | ' | ' |
Finance Receivables & Net Investment In Operating Leases, After Allowance for Credit Losses | 9,900,000,000 | ' | 8,100,000,000 | ' | ' | ' |
Related Debt | 7,000,000,000 | ' | 5,600,000,000 | ' | ' | ' |
Securitization Transactions [Member] | Variable Interest Entity, Primary Beneficiary [Member] | ' | ' | ' | ' | ' | ' |
Securitization Transactions [Line Items] | ' | ' | ' | ' | ' | ' |
Cash and cash equivalents | 2,000,000,000 | ' | 4,200,000,000 | ' | ' | ' |
Finance Receivables & Net Investment in Operating Leases, Before Allowance for Credit Losses | 47,600,000,000 | ' | 54,100,000,000 | ' | ' | ' |
Financing and Loans and Leases Receivable Allowance | 100,000,000 | ' | 200,000,000 | ' | ' | ' |
Finance Receivables & Net Investment In Operating Leases, After Allowance for Credit Losses | 47,500,000,000 | ' | 53,900,000,000 | ' | ' | ' |
Related Debt | 35,900,000,000 | ' | 40,700,000,000 | ' | ' | ' |
Securitization Transactions [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Financing Receivable [Member] | ' | ' | ' | ' | ' | ' |
Securitization Transactions [Line Items] | ' | ' | ' | ' | ' | ' |
Cash and cash equivalents | 1,600,000,000 | ' | 3,800,000,000 | ' | ' | ' |
Finance Receivables & Net Investment in Operating Leases, Before Allowance for Credit Losses | 37,700,000,000 | ' | 46,000,000,000 | ' | ' | ' |
Financing and Loans and Leases Receivable Allowance | 100,000,000 | ' | 200,000,000 | ' | ' | ' |
Finance Receivables & Net Investment In Operating Leases, After Allowance for Credit Losses | 37,600,000,000 | ' | 45,800,000,000 | ' | ' | ' |
Related Debt | 28,900,000,000 | ' | 35,100,000,000 | ' | ' | ' |
Securitization Transactions [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Retail [Member] | ' | ' | ' | ' | ' | ' |
Securitization Transactions [Line Items] | ' | ' | ' | ' | ' | ' |
Cash and cash equivalents | 1,300,000,000 | ' | 1,900,000,000 | ' | ' | ' |
Finance Receivables & Net Investment in Operating Leases, Before Allowance for Credit Losses | 17,600,000,000 | ' | 23,100,000,000 | ' | ' | ' |
Financing and Loans and Leases Receivable Allowance | 100,000,000 | ' | 200,000,000 | ' | ' | ' |
Finance Receivables & Net Investment In Operating Leases, After Allowance for Credit Losses | 17,500,000,000 | ' | 22,900,000,000 | ' | ' | ' |
Related Debt | 15,800,000,000 | ' | 20,300,000,000 | ' | ' | ' |
Securitization Transactions [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Wholesale [Member] | ' | ' | ' | ' | ' | ' |
Securitization Transactions [Line Items] | ' | ' | ' | ' | ' | ' |
Cash and cash equivalents | 300,000,000 | ' | 1,900,000,000 | ' | ' | ' |
Finance Receivables & Net Investment in Operating Leases, Before Allowance for Credit Losses | 20,100,000,000 | ' | 22,900,000,000 | ' | ' | ' |
Financing and Loans and Leases Receivable Allowance | 0 | ' | 0 | ' | ' | ' |
Finance Receivables & Net Investment In Operating Leases, After Allowance for Credit Losses | 20,100,000,000 | ' | 22,900,000,000 | ' | ' | ' |
Related Debt | 13,100,000,000 | ' | 14,800,000,000 | ' | ' | ' |
Securitization Transactions [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Net Investment in Operating Leases [Member] | ' | ' | ' | ' | ' | ' |
Securitization Transactions [Line Items] | ' | ' | ' | ' | ' | ' |
Cash and cash equivalents | 400,000,000 | ' | 400,000,000 | ' | ' | ' |
Finance Receivables & Net Investment in Operating Leases, Before Allowance for Credit Losses | 9,900,000,000 | ' | 8,100,000,000 | ' | ' | ' |
Financing and Loans and Leases Receivable Allowance | 0 | ' | 0 | ' | ' | ' |
Finance Receivables & Net Investment In Operating Leases, After Allowance for Credit Losses | 9,900,000,000 | ' | 8,100,000,000 | ' | ' | ' |
Related Debt | 7,000,000,000 | ' | 5,600,000,000 | ' | ' | ' |
Securitization Transactions [Member] | Consolidated Entity Excluding Variable Interest Entities (VIE) [Member] | ' | ' | ' | ' | ' | ' |
Securitization Transactions [Line Items] | ' | ' | ' | ' | ' | ' |
Cash and cash equivalents | 400,000,000 | ' | 200,000,000 | ' | ' | ' |
Finance Receivables & Net Investment in Operating Leases, Before Allowance for Credit Losses | 7,400,000,000 | ' | 5,600,000,000 | ' | ' | ' |
Financing and Loans and Leases Receivable Allowance | 0 | ' | 0 | ' | ' | ' |
Finance Receivables & Net Investment In Operating Leases, After Allowance for Credit Losses | 7,400,000,000 | ' | 5,600,000,000 | ' | ' | ' |
Related Debt | 6,800,000,000 | ' | 5,200,000,000 | ' | ' | ' |
Securitization Transactions [Member] | Consolidated Entity Excluding Variable Interest Entities (VIE) [Member] | Financing Receivable [Member] | ' | ' | ' | ' | ' | ' |
Securitization Transactions [Line Items] | ' | ' | ' | ' | ' | ' |
Cash and cash equivalents | 400,000,000 | ' | 200,000,000 | ' | ' | ' |
Finance Receivables & Net Investment in Operating Leases, Before Allowance for Credit Losses | 7,400,000,000 | ' | 5,600,000,000 | ' | ' | ' |
Financing and Loans and Leases Receivable Allowance | 0 | ' | 0 | ' | ' | ' |
Finance Receivables & Net Investment In Operating Leases, After Allowance for Credit Losses | 7,400,000,000 | ' | 5,600,000,000 | ' | ' | ' |
Related Debt | 6,800,000,000 | ' | 5,200,000,000 | ' | ' | ' |
Securitization Transactions [Member] | Consolidated Entity Excluding Variable Interest Entities (VIE) [Member] | Retail [Member] | ' | ' | ' | ' | ' | ' |
Securitization Transactions [Line Items] | ' | ' | ' | ' | ' | ' |
Cash and cash equivalents | 400,000,000 | ' | 200,000,000 | ' | ' | ' |
Finance Receivables & Net Investment in Operating Leases, Before Allowance for Credit Losses | 6,400,000,000 | ' | 4,600,000,000 | ' | ' | ' |
Financing and Loans and Leases Receivable Allowance | 0 | ' | 0 | ' | ' | ' |
Finance Receivables & Net Investment In Operating Leases, After Allowance for Credit Losses | 6,400,000,000 | ' | 4,600,000,000 | ' | ' | ' |
Related Debt | 5,900,000,000 | ' | 4,400,000,000 | ' | ' | ' |
Securitization Transactions [Member] | Consolidated Entity Excluding Variable Interest Entities (VIE) [Member] | Wholesale [Member] | ' | ' | ' | ' | ' | ' |
Securitization Transactions [Line Items] | ' | ' | ' | ' | ' | ' |
Cash and cash equivalents | 0 | ' | 0 | ' | ' | ' |
Finance Receivables & Net Investment in Operating Leases, Before Allowance for Credit Losses | 1,000,000,000 | ' | 1,000,000,000 | ' | ' | ' |
Financing and Loans and Leases Receivable Allowance | 0 | ' | 0 | ' | ' | ' |
Finance Receivables & Net Investment In Operating Leases, After Allowance for Credit Losses | 1,000,000,000 | ' | 1,000,000,000 | ' | ' | ' |
Related Debt | 900,000,000 | ' | 800,000,000 | ' | ' | ' |
Securitization Transactions [Member] | Consolidated Entity Excluding Variable Interest Entities (VIE) [Member] | Net Investment in Operating Leases [Member] | ' | ' | ' | ' | ' | ' |
Securitization Transactions [Line Items] | ' | ' | ' | ' | ' | ' |
Cash and cash equivalents | 0 | ' | 0 | ' | ' | ' |
Finance Receivables & Net Investment in Operating Leases, Before Allowance for Credit Losses | 0 | ' | 0 | ' | ' | ' |
Financing and Loans and Leases Receivable Allowance | 0 | ' | 0 | ' | ' | ' |
Finance Receivables & Net Investment In Operating Leases, After Allowance for Credit Losses | 0 | ' | 0 | ' | ' | ' |
Related Debt | $0 | ' | $0 | ' | ' | ' |