Income Taxes (Deferred Income Taxes) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Aggregate deferred income tax amounts
Deferred tax liabilities	$ 5,871	$ 7,052
Components of Deferred Tax Assets and Liabilities [Abstract]
Valuation allowance	628	613
Expires With In Three Years [Member]
Components of Deferred Tax Assets and Liabilities [Abstract]
Non-U.S. loss carryforwards	(76)
Non-U.S. loss carryforwards	(76)
Expires After Three Year And Before Fifteen Years [Member]
Components of Deferred Tax Assets and Liabilities [Abstract]
Non-U.S. loss carryforwards	(178)
Non-U.S. loss carryforwards	(178)
May Be Carried Indefinitely [Member]
Components of Deferred Tax Assets and Liabilities [Abstract]
Non-U.S. loss carryforwards	(2,861)
Non-U.S. loss carryforwards	(2,861)
Deferred Tax Asset [Member]
Aggregate deferred income tax amounts
Deferred tax assets	(12,185)	(10,919)
Components of Deferred Tax Assets and Liabilities [Abstract]
Non-U.S. loss carryforwards	(3,115)	(2,861)
Investment in global subsidiaries - assets	(1,451)	0
Other - net	(5,655)	(4,941)
Allowance for losses	(1,964)	(2,949)
Cash flow hedges	0	(104)
Net unrealized losses on securities	0	(64)
Non-U.S. loss carryforwards	(3,115)	(2,861)
Deferred Tax Liability [Member]
Components of Deferred Tax Assets and Liabilities [Abstract]
Intangible assets	1,657	1,689
Investment in global subsidiaries - liabilities	0	85
Financing leases	4,506	6,718
Operating leases	5,939	5,030
Cash flow hedges	119	0
Other - net	5,514	4,449
Net unrealized losses on securities	321	0
Deferred income taxes	$ 18,056	$ 17,971