Businesses Held for Sale, Financing Receivables Held for Sale and Discontinued Operations (Discontinued Operations) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Operations
Interest	$ 1,651	$ 1,887
Provision for Loan and Lease Losses	4,859	984
Disposal
Earnings (loss) from discontinued operations, net of taxes (Note 2)	(2,201)	252
Assets
Cash and cash equivalents	259		320
Other assets	10,148		13,026
Assets of discontinued operations	31,252		36,785
Goodwill	19,639		24,489
Investments	41,853		47,478
Liabilities
All other liabilities	1,010		845
Liabilities of discontinued operations	1,951		2,139
Short-term borrowings	66,178		68,515
Accounts Payable, Current	4,960		5,632
Discontinued Operations [Member]
Operations
Total revenues (loss)	500	660
Earnings (loss) from discontinued operations before income taxes	31	123
Benefit (provision) for income taxes	122	110
Earnings (loss) from discontinued operations, net of taxes	153	233
Disposal
Gain (loss) on disposal before income taxes	(1,808)	18
Benefit (provision) for income taxes	(546)	1
Gain (loss) on disposal, net of taxes	(2,354)	19
Earnings (loss) from discontinued operations, net of taxes (Note 2)	(2,201)	252
Assets
Cash and cash equivalents	259		320
Financing Receivables - net	19,348		19,636
Property, plant and equipment - net	137		141
Other assets	10,148		13,026
other receivables	411		413
Goodwill	440		537
other intangible assets	93		109
deferred income tax asset	1,425		1,755
Investments	799		848
Valuation allowance on disposal group	(1,808)		0
Liabilities
Deferred income taxes	184		238
All other liabilities	1,010		845
Long-term borrowings	188		234
Short-term borrowings	20		273
Accounts Payable, Current	465		549
Other current liabilities	84		0
Held for sale [Member]
Assets
Cash and cash equivalents	1,560		676
Financing Receivables - net	31,318		2,144
Property, plant and equipment - net	7,130		37
Other assets	2,597		50
Assets of discontinued operations	53,598		3,474
Investments	7,720		448
Valuation allowance on disposal group	(1,845)
Liabilities
All other liabilities	1,636		92
Liabilities of discontinued operations	6,334		2,434
Long-term borrowings	230		0
Short-term borrowings	836		435
Real Estate [Member]
Disposal
Earnings (loss) from discontinued operations, net of taxes (Note 2)	(1,765)	138
Real Estate [Member] | Discontinued Operations [Member]
Operations
Total revenues (loss)	499	630
Interest	(237)	(273)
Operating and administrative	(164)	(149)
Depreciation and amortization	(60)	(86)
Provision for Loan and Lease Losses	4	15
Earnings (loss) from discontinued operations before income taxes	42	137
Benefit (provision) for income taxes	30	103
Earnings (loss) from discontinued operations, net of taxes	72	240
Disposal
Gain (loss) on disposal before income taxes	(1,808)	0
Benefit (provision) for income taxes	(546)	0
Gain (loss) on disposal, net of taxes	(2,354)	0
Earnings (loss) from discontinued operations, net of taxes (Note 2)	$ (2,282)	$ 240