Financing Receivables, Allowance For Losses On Financing Receivables and Supplemental Information On Credit Quality (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, Gross	$ 252,386	$ 258,207
Less allowance for losses	(5,144)	(5,178)	(5,303)	(4,944)
Financing receivables, net	247,242	253,029
Deferred income	1,714	2,013
Loans that have been acquired in a transfer but have been subject to credit deterioration since origination per ASC 310, Receivables	532	544
Loans and Finance Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, Gross	226,135	231,268
Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, Gross	$ 26,251	$ 26,939