Parent And Guarantor Consolidating Financial Statements (Schedule Of Condensed Consolidating Balance Sheet) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]
Cash and Due from Banks	$ 1,043	$ 1,073
Interest-bearing Deposits in Banks and Other Financial Institutions	6,394	6,440
Total cash and cash equivalents	7,437	7,513	13,079	13,035
Investment securities	15,752	14,178
Loans held-for-sale, net	718	2,576
Finance receivables and loans, net	99,123	99,055	118,986
Loans to bank subsidiary	0	0
Loans to nonbank subsidiary	0	0
Allowance for loan losses	(1,197)	(1,170)
Total finance receivables and loans, net	97,926	97,885
Investment in operating leases, net	14,828	13,550
Receivables from bank subsidiary	0	0
Receivables from nonbank subsidiary	0	0
Investment in bank subsidiaries	0	0
Investment in nonbank subsidiaries	0	0
Mortgage servicing rights	917	952	2,595	2,519
Premiums receivable and other insurance assets	1,608	1,609
Other Assets	7,950	11,908
Assets of operations held-for-sale	19,063	32,176
Total assets	166,199	182,347	186,350
Noninterest-bearing deposit liabilities	844	1,977
Interest-bearing deposit liabilities	49,482	45,938
Total deposit liabilities	50,326	47,915
Short-term borrowings	7,618	7,461
Long-term debt	67,621	74,561
Debt Payable To Nonbank Subsidiaries	0	0
Payables to Bank Subsidiaries	0	0
Payables to Nonbank Subsidiaries	0	0
Interest payable	972	932
Unearned insurance premiums and service revenue	2,286	2,296
Accrued expenses and other liabilities	3,669	6,585
Liabilities of operations held-for-sale	13,233	22,699
Total liabilities	145,725	162,449
Total equity	20,474	19,898	19,576	19,280
Total liabilities and equity	166,199	182,347
Intercompany [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and Due from Banks	0	0
Interest-bearing Deposits in Banks and Other Financial Institutions	0	0
Noninterest-bearing deposit liabilities	0	0
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and Due from Banks	554	729
Interest-bearing Deposits in Banks and Other Financial Institutions	2,700	3,204
Total cash and cash equivalents	3,338	3,972	4,988	6,261
Investment securities	0	0
Loans held-for-sale, net	0	0
Finance receivables and loans, net	16,495	12,486
Loans to bank subsidiary	2,200	1,600
Loans to nonbank subsidiary	3,285	3,514
Allowance for loan losses	(253)	(170)
Total finance receivables and loans, net	21,727	17,430
Investment in operating leases, net	2,306	2,003
Receivables from bank subsidiary	968	677
Receivables from nonbank subsidiary	202	315
Investment in bank subsidiaries	14,513	14,288
Investment in nonbank subsidiaries	14,589	19,180
Mortgage servicing rights	0	0
Premiums receivable and other insurance assets	0	0
Other Assets	2,567	2,514
Assets of operations held-for-sale	900	855
Total assets	61,110	61,234
Noninterest-bearing deposit liabilities	0	0
Interest-bearing deposit liabilities	835	983
Total deposit liabilities	835	983
Short-term borrowings	3,229	3,094
Long-term debt	31,941	32,342
Debt Payable To Nonbank Subsidiaries	691	530
Payables to Bank Subsidiaries	934	752
Payables to Nonbank Subsidiaries	466	674
Interest payable	732	748
Unearned insurance premiums and service revenue	0	0
Accrued expenses and other liabilities	1,775	2,187
Liabilities of operations held-for-sale	33	26
Total liabilities	40,636	41,336
Total equity	20,474	19,898
Total liabilities and equity	61,110	61,234
Parent [Member] | Intercompany [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and Due from Banks	84	39
Interest-bearing Deposits in Banks and Other Financial Institutions	0	0
Noninterest-bearing deposit liabilities	0	0
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and Due from Banks	0	0
Interest-bearing Deposits in Banks and Other Financial Institutions	0	0
Total cash and cash equivalents	0	0	32	14
Investment securities	0	0
Loans held-for-sale, net	0	0
Finance receivables and loans, net	0	0
Loans to bank subsidiary	0	0
Loans to nonbank subsidiary	0	0
Allowance for loan losses	0	0
Total finance receivables and loans, net	0	0
Investment in operating leases, net	0	0
Receivables from bank subsidiary	2	0
Receivables from nonbank subsidiary	0	334
Investment in bank subsidiaries	14,513	14,288
Investment in nonbank subsidiaries	917	3,723
Mortgage servicing rights	0	0
Premiums receivable and other insurance assets	0	0
Other Assets	0	0
Assets of operations held-for-sale	453	762
Total assets	15,885	19,107
Noninterest-bearing deposit liabilities	0	0
Interest-bearing deposit liabilities	0	0
Total deposit liabilities	0	0
Short-term borrowings	0	0
Long-term debt	0	0
Debt Payable To Nonbank Subsidiaries	0	0
Payables to Bank Subsidiaries	2	0
Payables to Nonbank Subsidiaries	0	0
Interest payable	0	0
Unearned insurance premiums and service revenue	0	0
Accrued expenses and other liabilities	111	451
Liabilities of operations held-for-sale	425	725
Total liabilities	538	1,176
Total equity	15,347	17,931
Total liabilities and equity	15,885	19,107
Guarantor Subsidiaries [Member] | Intercompany [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and Due from Banks	0	0
Interest-bearing Deposits in Banks and Other Financial Institutions	0	0
Noninterest-bearing deposit liabilities	0	0
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and Due from Banks	489	344
Interest-bearing Deposits in Banks and Other Financial Institutions	3,694	3,236
Total cash and cash equivalents	4,837	4,032	8,989	7,276
Investment securities	15,752	14,178
Loans held-for-sale, net	718	2,576
Finance receivables and loans, net	82,628	86,569
Loans to bank subsidiary	0	0
Loans to nonbank subsidiary	109	672
Allowance for loan losses	(944)	(1,000)
Total finance receivables and loans, net	81,793	86,241
Investment in operating leases, net	12,522	11,547
Receivables from bank subsidiary	0	0
Receivables from nonbank subsidiary	550	378
Investment in bank subsidiaries	0	0
Investment in nonbank subsidiaries	0	0
Mortgage servicing rights	917	952
Premiums receivable and other insurance assets	1,617	1,609
Other Assets	5,762	9,968
Assets of operations held-for-sale	17,725	30,582
Total assets	142,193	162,063
Noninterest-bearing deposit liabilities	844	1,977
Interest-bearing deposit liabilities	48,647	44,955
Total deposit liabilities	49,575	46,971
Short-term borrowings	4,389	4,367
Long-term debt	35,680	42,219
Debt Payable To Nonbank Subsidiaries	5,557	5,708
Payables to Bank Subsidiaries	0	0
Payables to Nonbank Subsidiaries	329	278
Interest payable	240	184
Unearned insurance premiums and service revenue	2,286	2,296
Accrued expenses and other liabilities	2,163	4,517
Liabilities of operations held-for-sale	12,775	21,948
Total liabilities	112,994	128,488
Total equity	29,199	33,575
Total liabilities and equity	142,193	162,063
Non-Guarantor Subsidiaries [Member] | Intercompany [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and Due from Banks	0	0
Interest-bearing Deposits in Banks and Other Financial Institutions	654	452
Noninterest-bearing deposit liabilities	84	39
Consolidation, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and Due from Banks	0	0
Interest-bearing Deposits in Banks and Other Financial Institutions	0	0
Total cash and cash equivalents	(738)	(491)	(930)	(516)
Investment securities	0	0
Loans held-for-sale, net	0	0
Finance receivables and loans, net	0	0
Loans to bank subsidiary	(2,200)	(1,600)
Loans to nonbank subsidiary	(3,394)	(4,186)
Allowance for loan losses	0	0
Total finance receivables and loans, net	(5,594)	(5,786)
Investment in operating leases, net	0	0
Receivables from bank subsidiary	(970)	(677)
Receivables from nonbank subsidiary	(752)	(1,027)
Investment in bank subsidiaries	(29,026)	(28,576)
Investment in nonbank subsidiaries	(15,506)	(22,903)
Mortgage servicing rights	0	0
Premiums receivable and other insurance assets	(9)	0
Other Assets	(379)	(574)
Assets of operations held-for-sale	(15)	(23)
Total assets	(52,989)	(60,057)
Noninterest-bearing deposit liabilities	0	0
Interest-bearing deposit liabilities	0	0
Total deposit liabilities	(84)	(39)
Short-term borrowings	0	0
Long-term debt	0	0
Debt Payable To Nonbank Subsidiaries	(6,248)	(6,238)
Payables to Bank Subsidiaries	(936)	(752)
Payables to Nonbank Subsidiaries	(795)	(952)
Interest payable	0	0
Unearned insurance premiums and service revenue	0	0
Accrued expenses and other liabilities	(380)	(570)
Liabilities of operations held-for-sale	0	0
Total liabilities	(8,443)	(8,551)
Total equity	(44,546)	(51,506)
Total liabilities and equity	(52,989)	(60,057)
Consolidation, Eliminations [Member] | Intercompany [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and Due from Banks	(84)	(39)
Interest-bearing Deposits in Banks and Other Financial Institutions	(654)	(452)
Noninterest-bearing deposit liabilities	$ (84)	$ (39)