Debt and Commitments - Asset Backed Debt (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Asset Backed Debt [Abstract]
Interest expense	$ 3,227,000,000	$ 3,496,000,000	$ 3,689,000,000
Cash and cash equivalents	14,272,000,000	10,757,000,000	14,468,000,000	$ 15,659,000,000
Finance receivables, net	90,691,000,000	81,111,000,000
Net investment in operating leases	27,093,000,000	23,217,000,000
Financial Services [Member]
Asset Backed Debt [Abstract]
Contractual Obligation	120,015,000,000
Derivative income/(expense)	481,000,000	512,000,000	110,000,000
Interest expense	2,454,000,000	2,699,000,000	2,860,000,000
Cash and cash equivalents	8,886,000,000	6,190,000,000	9,509,000,000	$ 9,412,000,000
Finance receivables, net	96,063,000,000	86,141,000,000
Net investment in operating leases	25,079,000,000	21,518,000,000
Financial Services [Member] | Asset-backed debt [Member]
Asset Backed Debt [Abstract]
Contractual Obligation	50,039,000,000
Financial Services [Member] | Asset-backed debt [Member] | Securitization Transactions [Member]
Asset Backed Debt [Abstract]
Derivative income/(expense)	2,000,000	4,000,000	(25,000,000)
Interest expense	630,000,000	595,000,000	$ 640,000,000
Cash and cash equivalents	4,300,000,000	2,400,000,000
Finance receivables, net	53,600,000,000	46,100,000,000
Net investment in operating leases	13,300,000,000	9,600,000,000
Long-term Debt, Gross	50,000,000,000	43,300,000,000
Financial Services [Member] | Asset-backed debt [Member] | Securitization Transactions [Member] | Minimum [Member]
Asset Backed Debt [Abstract]
Cash contribution for collateral to support Wholesale Securitization Program	0	0
Financial Services [Member] | Asset-backed debt [Member] | Securitization Transactions [Member] | Maximum [Member]
Asset Backed Debt [Abstract]
Cash contribution for collateral to support Wholesale Securitization Program	$ 72,000,000	$ 242,000,000