Consolidated Statement Of Cash Flows (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income (loss)	$ 257		$ (204)
Depreciation, Amortization and Accretion, Net	2,106		1,758
Changes In Fair Value Of Mortgage Servicing Rights	102		654
Provision for Loan Losses Expensed Including Discontinued Operations	431		285
Gain Loss on Sales of Loans Net Including Discontinued Operations	(52)		(396)
Available-for-sale Securities Gross Realized Gain Loss Excluding Otti Including Disc Ops	(156)		(144)
Gains (Losses) on Extinguishment of Debt	42		0
Payments for Origination and Purchases of Loans Held-for-sale	(6,234)		(23,670)
Proceeds from Sale of Loans Held-for-sale	8,647		25,295
Total Charge Recorded Related to ResCap Bankruptcy	1,350		1,192
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	(932)		(28)
Trading assets	0		595
Deferred income taxes	(604)		(199)
Interest payable	51		168
Other assets	2,943		475
Other liabilities	(3,456)		(761)
Other, net	(130)		(175)
Net cash provided by (used in) operating activities	4,365		4,845
Net Cash Provided by (Used in) Investing Activities [Abstract]
Purchases of available-for-sale securities	(12,747)		(9,592)
Proceeds from sales of available-for-sale securities	4,721		6,774
Proceeds from maturities of available-for-sale securities	3,893		4,940
Net (increase) decrease in finance receivables and loans	2,744		(7,925)
Proceeds from Sale of Loans Held-for-investment	0		2,329
Purchases of operating lease assets	(7,251)		(5,612)
Disposals of operating lease assets	2,080		1,303
Payments for (Proceeds from) Mortgage Servicing Rights	911		0
Proceeds from sale of business units, net	6,937	[1]	516	[1]
Cash Divested from Deconsolidation	0		(539)
Increase (Decrease) in Restricted Cash	2,297		92
Other, net	(55)		(17)
Net cash (used in) provided by investing activities	3,530		(7,731)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Net change in short-term borrowings	(936)		(1,673)
Net increase in bank deposits	4,057		4,647
Proceeds from issuance of long-term debt	13,347		27,520
Repayments of long-term debt	(26,725)		(22,908)
Dividends paid	(601)		(601)
Net cash provided by (used in) financing activities	(10,858)		6,985
Effect of exchange-rate changes on cash and cash equivalents	47		(1)
Cash and Cash Equivalents, Period Increase (Decrease)	(2,916)		4,098
Net Cash Provided by (Used in) Discontinued Operations	1,952	[1],[2]	24	[1],[2]
Cash and cash equivalents at beginning of period	7,513		13,035
Cash and cash equivalents at end of period	6,549		17,157
Cash and cash equivalents of business units at the time of disposition	1,418		147
Supplemental Cash Flow Information [Abstract]
Interest	2,890		3,705
Income taxes	67		291
Proceeds from sales and repayments of mortgage loans held-for-investment originally designated as held-for-sale	$ 43		$ 116

[1] The amounts are net of cash and cash equivalents of $1,418 million at September 30, 2013 and $147 million at September 30, 2012 of business units at the time of disposition.

[2] Cash flows of discontinued operations are reflected within operating, investing, and financing activities in the Condensed Consolidated Statement of Cash Flows. The cash balance of these operations is reported as assets of operations held-for-sale on the Condensed Consolidated Balance Sheet.