Financing Receivables and Allowance for Losses (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Financing Receivable [Line Items]
Financing receivables, net of deferred income	$ 84,476	$ 84,476	$ 126,561
Allowance for losses	(3,393)	(3,393)	(4,104)	$ (4,165)	$ (4,025)
Financing receivables, net	81,083	81,083	122,457
Financing receivable held for sale	0	28,170
Assets of Businesses Held for Sale [Member]
Financing Receivable [Line Items]
Financing receivable held for sale	0	5,508
Loans Receivables [Member]
Financing Receivable [Line Items]
Financing receivables, net of deferred income	79,169	79,169	120,007
Investment in Financing Leases [Member]
Financing Receivable [Line Items]
Financing receivables, net of deferred income	$ 5,307	$ 5,307	$ 6,554