Parent And Guarantor Consolidating Financial Statements (Schedule Of Condensed Consolidating Balance Sheet) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and Due from Banks	$ 1,552	$ 1,348
Interest-bearing Deposits in Banks and Other Financial Institutions	6,084	4,228
Total cash and cash equivalents	7,636	5,576	5,893	5,531
Federal Funds Sold and Securities Purchased under Agreements to Resell	50	0
Investment securities	17,829	16,137
Loans held-for-sale, net	1,559	2,003
Finance receivables and loans, net	99,857	99,948
Loans to bank subsidiary	0	0
Loans to nonbank subsidiary	0	0
Allowance for loan losses	(933)	(977)	(1,192)	(1,208)
Total finance receivables and loans, net	98,924	98,971
Investment in operating leases, net	19,021	19,510
Receivables from bank subsidiary	0	0
Receivables from nonbank subsidiary	0	0
Investment in bank subsidiaries	0	0
Investment in nonbank subsidiaries	0	0
Premiums receivable and other insurance assets	1,722	1,695
Other Assets	6,783	7,302
Assets of operations held-for-sale	0	634
Total assets	153,524	151,828	148,452
Noninterest-bearing deposit liabilities	79	64
Interest-bearing deposit liabilities	60,796	58,158
Total deposit liabilities	60,875	58,222
Short-term borrowings	6,447	7,062
Long-term debt	65,760	66,558
Debt Payable To Nonbank Subsidiaries	0	0
Payables to Bank Subsidiaries	0	0
Payables to Nonbank Subsidiaries	0	0
Interest payable	440	477
Unearned insurance premiums and service revenue	2,374	2,375
Accrued expenses and other liabilities	1,694	1,735
Total liabilities	137,590	136,429
Total equity	15,934	15,399	14,459	14,208
Total liabilities and equity	153,524	151,828
Parent [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and Due from Banks	945	986
Interest-bearing Deposits in Banks and Other Financial Institutions	1,700	1,300
Total cash and cash equivalents	2,645	2,286	2,360	2,930
Federal Funds Sold and Securities Purchased under Agreements to Resell	0
Investment securities	0	0
Loans held-for-sale, net	0	3
Finance receivables and loans, net	6,034	4,225
Loans to bank subsidiary	700	625
Loans to nonbank subsidiary	1,745	3,500
Allowance for loan losses	(129)	(102)
Total finance receivables and loans, net	8,350	8,248
Investment in operating leases, net	0	0
Receivables from bank subsidiary	493	219
Receivables from nonbank subsidiary	254	267
Investment in bank subsidiaries	16,171	15,967
Investment in nonbank subsidiaries	11,255	11,559
Premiums receivable and other insurance assets	0	0
Other Assets	4,835	4,889
Assets of operations held-for-sale		634
Total assets	44,003	44,072
Noninterest-bearing deposit liabilities	0	0
Interest-bearing deposit liabilities	310	319
Total deposit liabilities	310	319
Short-term borrowings	3,481	3,338
Long-term debt	20,774	21,199
Debt Payable To Nonbank Subsidiaries	2,183	2,385
Payables to Bank Subsidiaries	187	94
Payables to Nonbank Subsidiaries	437	454
Interest payable	227	316
Unearned insurance premiums and service revenue	0	0
Accrued expenses and other liabilities	470	568
Total liabilities	28,069	28,673
Total equity	15,934	15,399
Total liabilities and equity	44,003	44,072
Guarantor Subsidiaries [Member]
Condensed Balance Sheet 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	26	37
Federal Funds Sold and Securities Purchased under Agreements to Resell	0
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	0
Investment in bank subsidiaries	16,171	15,967
Investment in nonbank subsidiaries	12	12
Premiums receivable and other insurance assets	0	0
Other Assets	0	0
Assets of operations held-for-sale		0
Total assets	16,183	15,979
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	82	82
Total liabilities	82	82
Total equity	16,101	15,897
Total liabilities and equity	16,183	15,979
Non-Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and Due from Banks	607	362
Interest-bearing Deposits in Banks and Other Financial Institutions	4,384	2,928
Total cash and cash equivalents	5,608	3,905	3,918	2,974
Federal Funds Sold and Securities Purchased under Agreements to Resell	50
Investment securities	17,829	16,137
Loans held-for-sale, net	1,559	2,000
Finance receivables and loans, net	93,823	95,723
Loans to bank subsidiary	0	0
Loans to nonbank subsidiary	1,566	1,770
Allowance for loan losses	(804)	(875)
Total finance receivables and loans, net	94,585	96,618
Investment in operating leases, net	19,021	19,510
Receivables from bank subsidiary	0	0
Receivables from nonbank subsidiary	406	393
Investment in bank subsidiaries	0	0
Investment in nonbank subsidiaries	0	0
Premiums receivable and other insurance assets	1,742	1,717
Other Assets	4,662	4,879
Assets of operations held-for-sale		0
Total assets	145,462	145,159
Noninterest-bearing deposit liabilities	79	64
Interest-bearing deposit liabilities	60,486	57,839
Total deposit liabilities	60,565	57,903
Short-term borrowings	2,966	3,724
Long-term debt	44,986	45,359
Debt Payable To Nonbank Subsidiaries	2,445	4,125
Payables to Bank Subsidiaries	0	0
Payables to Nonbank Subsidiaries	550	354
Interest payable	213	161
Unearned insurance premiums and service revenue	2,374	2,375
Accrued expenses and other liabilities	3,856	3,551
Total liabilities	117,955	117,552
Total equity	27,507	27,607
Total liabilities and equity	145,462	145,159
Consolidation, Eliminations [Member]
Condensed Balance Sheet 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	(617)	(615)	(411)	(410)
Federal Funds Sold and Securities Purchased under Agreements to Resell	0
Investment securities	0	0
Loans held-for-sale, net	0	0
Finance receivables and loans, net	0	0
Loans to bank subsidiary	(700)	(625)
Loans to nonbank subsidiary	(3,311)	(5,270)
Allowance for loan losses	0	0
Total finance receivables and loans, net	(4,011)	(5,895)
Investment in operating leases, net	0	0
Receivables from bank subsidiary	(493)	(219)
Receivables from nonbank subsidiary	(660)	(660)
Investment in bank subsidiaries	(32,342)	(31,934)
Investment in nonbank subsidiaries	(11,267)	(11,571)
Premiums receivable and other insurance assets	(20)	(22)
Other Assets	(2,714)	(2,466)
Assets of operations held-for-sale		0
Total assets	(52,124)	(53,382)
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	(4,628)	(6,510)
Payables to Bank Subsidiaries	(187)	(94)
Payables to Nonbank Subsidiaries	(987)	(808)
Interest payable	0	0
Unearned insurance premiums and service revenue	0	0
Accrued expenses and other liabilities	(2,714)	(2,466)
Total liabilities	(8,516)	(9,878)
Total equity	(43,608)	(43,504)
Total liabilities and equity	(52,124)	(53,382)
Fair Value Option Election, Fair Value [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Finance receivables and loans, net	99,857	99,948
Affiliated Entity [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Interest-bearing Deposits in Banks and Other Financial Institutions	0	0
Affiliated Entity [Member] | Parent [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Interest-bearing Deposits in Banks and Other Financial Institutions	0	0
Affiliated Entity [Member] | Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Interest-bearing Deposits in Banks and Other Financial Institutions	0	0
Affiliated Entity [Member] | Non-Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Interest-bearing Deposits in Banks and Other Financial Institutions	617	615
Affiliated Entity [Member] | Consolidation, Eliminations [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Interest-bearing Deposits in Banks and Other Financial Institutions	$ (617)	$ (615)