Consolidated Statement Of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income (loss)	$ 1,093		$ 310
Depreciation, Amortization and Accretion, Net	657		568
Changes In Fair Value Of Mortgage Servicing Rights	90		(1)
Provision for Loan Losses Expensed Including Discontinued Operations	158		140
Gain Loss on Sales of Loans Net Including Discontinued Operations	(38)		(131)
Available-for-sale Securities Gross Realized Gain Loss Excluding Otti Including Disc Ops	(53)		(96)
Payments for Origination and Purchases of Loans Held-for-sale	(5,759)		(9,626)
Proceeds from Sale of Loans Held-for-sale	7,481		11,111
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	(888)		0
Trading assets	0		(268)
Deferred income taxes	(116)		(31)
Interest payable	44		86
Other assets	1,329		755
Other liabilities	(1,259)		(865)
Other, net	(485)		190
Net cash provided by (used in) operating activities	2,254		2,142
Net Cash Provided by (Used in) Investing Activities [Abstract]
Purchases of available-for-sale securities	(4,626)		(3,172)
Proceeds from sales of available-for-sale securities	1,543		2,940
Proceeds from maturities of available-for-sale securities	1,604		1,222
Net (increase) decrease in finance receivables and loans	(42)		(4,409)
Purchases of operating lease assets	(2,352)		(1,468)
Disposals of operating lease assets	641		465
Proceeds from sale of business units, net	2,829	[1]	29	[1]
Increase (Decrease) in Restricted Cash	1,067		280
Other, net	41		43
Net cash (used in) provided by investing activities	705		(4,070)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Net change in short-term borrowings	518		(546)
Net increase in bank deposits	2,360		2,089
Proceeds from issuance of long-term debt	4,253		10,749
Repayments of long-term debt	(11,445)		(10,024)
Dividends paid	(200)		(200)
Net cash provided by (used in) financing activities	(4,514)		2,068
Effect of exchange-rate changes on cash and cash equivalents	67		(141)
Net Cash Provided by (Used in) Continuing Operations	(1,488)		(1)
Net Cash Provided by (Used in) Discontinued Operations	1,412	[1],[2]	45	[1],[2]
Cash and cash equivalents at beginning of period	7,513		13,035
Cash and cash equivalents at end of period	7,437		13,079
Cash and cash equivalents of business units at the time of disposition	905		64
Supplemental Cash Flow Information [Abstract]
Interest	1,026		1,218
Income taxes	37		178
Proceeds from sales and repayments of mortgage loans held-for-investment originally designated as held-for-sale	$ 10		$ 63

[1] The amounts are net of cash and cash equivalents of $905 million at March 31, 2013 and $64 million at March 31, 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.