Fair Value Measurements (Details 4) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Financial Instruments, Financial Liabilities, Balance Sheet Groupings
Short-term borrowings	$ (4,497,000,000)	$ (3,663,000,000)
Carrying Amount
Financial Instruments, Financial Assets, Balance Sheet Groupings
Cash and cash equivalents	1,135,000,000	1,320,000,000
Foreign currency contracts, in a receivable position	4,000,000	7,000,000
Finance receivables, net (excluding finance leases)	21,331,000,000	20,667,000,000
Restricted cash and cash equivalents	51,000,000	17,000,000
Interest rate swaps, in a net receivable position	108,000,000	122,000,000
Financial Instruments, Financial Liabilities, Balance Sheet Groupings
Foreign currency contracts, in a payable position	(6,000,000)	(4,000,000)
Short-term borrowings	(4,497,000,000)	(3,663,000,000)
Long-term debt	(24,819,000,000)	(25,312,000,000)
Interest rate swaps, in a net payable position	(6,000,000)	(6,000,000)
Guarantees	(1,000,000)	(1,000,000)
Fair Value | Fair Value, Level 1
Financial Instruments, Financial Assets, Balance Sheet Groupings
Cash and cash equivalents	1,135,000,000	1,320,000,000
Restricted cash and cash equivalents	51,000,000	17,000,000
Financial Instruments, Financial Liabilities, Balance Sheet Groupings
Short-term borrowings	(4,497,000,000)	(3,663,000,000)
Fair Value | Fair Value, Level 2
Financial Instruments, Financial Assets, Balance Sheet Groupings
Foreign currency contracts, in a receivable position	4,000,000	7,000,000
Finance receivables, net (excluding finance leases)	20,983,000,000	20,469,000,000
Interest rate swaps, in a net receivable position	108,000,000	122,000,000
Financial Instruments, Financial Liabilities, Balance Sheet Groupings
Foreign currency contracts, in a payable position	(6,000,000)	(4,000,000)
Long-term debt	(25,399,000,000)	(25,849,000,000)
Interest rate swaps, in a net payable position	(6,000,000)	(6,000,000)
Fair Value | Fair Value, Level 3
Financial Instruments, Financial Liabilities, Balance Sheet Groupings
Guarantees	(1,000,000)	(1,000,000)
Carrying amount of assets excluded from measurement at fair value
Financial Instruments, Financial Assets, Balance Sheet Groupings
Finance leases	8,100,000,000	8,060,000,000
Cross currency contracts | Carrying Amount
Financial Instruments, Financial Assets, Balance Sheet Groupings
Foreign currency contracts, in a receivable position	7,000,000	9,000,000
Cross currency contracts | Fair Value | Fair Value, Level 2
Financial Instruments, Financial Assets, Balance Sheet Groupings
Foreign currency contracts, in a receivable position	$ 7,000,000	$ 9,000,000