Financing Receivables and Allowance for Losses on Financing Receivables (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, Gross	$ 246,851	$ 258,207
Less allowance for losses	(5,155)	(5,178)	(5,232)	(4,944)
Financing receivables, net	241,696	253,029
Deferred income	1,675	2,013
Loans that have been acquired in a transfer but have been subject to credit deterioration since origination per ASC 310, Receivables	391	544
Loans and Finance Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, Gross	220,929	231,268
Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, Gross	$ 25,922	$ 26,939