Parent And Guarantor Consolidating Financial Statements (Schedule Of Condensed Consolidating Balance Sheet) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]
Cash and Due from Banks	$ 1,292		$ 1,073
Interest-bearing Deposits in Banks and Other Financial Institutions	6,482		6,440
Total cash and cash equivalents	7,774		7,513	16,126		13,035
Investment securities	17,015		14,178
Loans held-for-sale, net	102		2,576
Finance receivables and loans, net	96,993		99,055	119,913
Loans to bank subsidiary	0		0
Loans to nonbank subsidiary	0		0
Allowance for loan losses	(1,183)		(1,170)
Total finance receivables and loans, net	95,810		97,885
Investment in operating leases, net	16,085		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	0	917	952	1,105	2,595	2,519
Premiums receivable and other insurance assets	1,611		1,609
Other Assets	6,701		11,908
Assets of operations held-for-sale	5,529		32,176
Total assets	150,627		182,347	178,560
Noninterest-bearing deposit liabilities	72		1,977
Interest-bearing deposit liabilities	50,053		45,938
Total deposit liabilities	50,125		47,915
Short-term borrowings	4,197		7,461
Long-term debt	64,534		74,561
Debt Payable To Nonbank Subsidiaries	0		0
Payables to Bank Subsidiaries	0		0
Payables to Nonbank Subsidiaries	0		0
Interest payable	999		932
Unearned insurance premiums and service revenue	2,301		2,296
Accrued expenses and other liabilities	5,043		6,585
Liabilities of operations held-for-sale	4,263		22,699
Total liabilities	131,462		162,449
Total equity	19,165		19,898	18,272		19,280
Total liabilities and equity	150,627		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	726		729
Interest-bearing Deposits in Banks and Other Financial Institutions	3,151		3,204
Total cash and cash equivalents	3,961		3,972	9,537		6,261
Investment securities	0		0
Loans held-for-sale, net	0		0
Finance receivables and loans, net	19,123		12,486
Loans to bank subsidiary	3,400		1,600
Loans to nonbank subsidiary	3,176		3,514
Allowance for loan losses	(314)		(170)
Total finance receivables and loans, net	25,385		17,430
Investment in operating leases, net	2,910		2,003
Receivables from bank subsidiary	82		677
Receivables from nonbank subsidiary	231		315
Investment in bank subsidiaries	14,530		14,288
Investment in nonbank subsidiaries	10,869		19,180
Mortgage servicing rights			0
Premiums receivable and other insurance assets	0		0
Other Assets	3,181		2,514
Assets of operations held-for-sale	620		855
Total assets	61,769		61,234
Noninterest-bearing deposit liabilities	0		0
Interest-bearing deposit liabilities	642		983
Total deposit liabilities	642		983
Short-term borrowings	3,197		3,094
Long-term debt	31,640		32,342
Debt Payable To Nonbank Subsidiaries	2,211		530
Payables to Bank Subsidiaries	100		752
Payables to Nonbank Subsidiaries	462		674
Interest payable	806		748
Unearned insurance premiums and service revenue	0		0
Accrued expenses and other liabilities	3,546		2,187
Liabilities of operations held-for-sale	0		26
Total liabilities	42,604		41,336
Total equity	19,165		19,898
Total liabilities and equity	61,769		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	29		0
Interest-bearing Deposits in Banks and Other Financial Institutions	0		0
Total cash and cash equivalents	29		0	10		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	0		0
Receivables from nonbank subsidiary	0		334
Investment in bank subsidiaries	14,530		14,288
Investment in nonbank subsidiaries	111		3,723
Mortgage servicing rights			0
Premiums receivable and other insurance assets	0		0
Other Assets	0		0
Assets of operations held-for-sale	0		762
Total assets	14,670		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	0		0
Payables to Nonbank Subsidiaries	0		0
Interest payable	0		0
Unearned insurance premiums and service revenue	0		0
Accrued expenses and other liabilities	100		451
Liabilities of operations held-for-sale	0		725
Total liabilities	100		1,176
Total equity	14,570		17,931
Total liabilities and equity	14,670		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	537		344
Interest-bearing Deposits in Banks and Other Financial Institutions	3,331		3,236
Total cash and cash equivalents	4,290		4,032	7,574		7,276
Investment securities	17,015		14,178
Loans held-for-sale, net	102		2,576
Finance receivables and loans, net	77,870		86,569
Loans to bank subsidiary	0		0
Loans to nonbank subsidiary	1,789		672
Allowance for loan losses	(869)		(1,000)
Total finance receivables and loans, net	78,790		86,241
Investment in operating leases, net	13,175		11,547
Receivables from bank subsidiary	0		0
Receivables from nonbank subsidiary	470		378
Investment in bank subsidiaries	0		0
Investment in nonbank subsidiaries	0		0
Mortgage servicing rights			952
Premiums receivable and other insurance assets	1,628		1,609
Other Assets	3,807		9,968
Assets of operations held-for-sale	4,909		30,582
Total assets	124,186		162,063
Noninterest-bearing deposit liabilities	72		1,977
Interest-bearing deposit liabilities	49,411		44,955
Total deposit liabilities	49,567		46,971
Short-term borrowings	1,000		4,367
Long-term debt	32,894		42,219
Debt Payable To Nonbank Subsidiaries	6,576		5,708
Payables to Bank Subsidiaries	0		0
Payables to Nonbank Subsidiaries	239		278
Interest payable	193		184
Unearned insurance premiums and service revenue	2,301		2,296
Accrued expenses and other liabilities	1,684		4,517
Liabilities of operations held-for-sale	4,263		21,948
Total liabilities	98,717		128,488
Total equity	25,469		33,575
Total liabilities and equity	124,186		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	422		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	(506)		(491)	(995)		(516)
Investment securities	0		0
Loans held-for-sale, net	0		0
Finance receivables and loans, net	0		0
Loans to bank subsidiary	(3,400)		(1,600)
Loans to nonbank subsidiary	(4,965)		(4,186)
Allowance for loan losses	0		0
Total finance receivables and loans, net	(8,365)		(5,786)
Investment in operating leases, net	0		0
Receivables from bank subsidiary	(82)		(677)
Receivables from nonbank subsidiary	(701)		(1,027)
Investment in bank subsidiaries	(29,060)		(28,576)
Investment in nonbank subsidiaries	(10,980)		(22,903)
Mortgage servicing rights			0
Premiums receivable and other insurance assets	(17)		0
Other Assets	(287)		(574)
Assets of operations held-for-sale	0		(23)
Total assets	(49,998)		(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	(8,787)		(6,238)
Payables to Bank Subsidiaries	(100)		(752)
Payables to Nonbank Subsidiaries	(701)		(952)
Interest payable	0		0
Unearned insurance premiums and service revenue	0		0
Accrued expenses and other liabilities	(287)		(570)
Liabilities of operations held-for-sale	0		0
Total liabilities	(9,959)		(8,551)
Total equity	(40,039)		(51,506)
Total liabilities and equity	(49,998)		(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	(422)		(452)
Noninterest-bearing deposit liabilities	$ (84)		$ (39)