Parent And Guarantor Consolidating Financial Statements (Schedule Of Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Condensed Balance Sheet Statements, Captions [Line Items]
Noninterest-bearing cash and cash equivalents	$ 1,906	$ 2,148
Interest-bearing cash and cash equivalents	3,095	4,232
Total cash and cash equivalents	5,001	6,380	$ 7,636	$ 5,576
Available-for-sale securities	18,180	17,157
Held-to-maturity securities	118	0
Loans held-for-sale, net	39	105
Finance receivables and loans, net	110,876	111,600	99,856
Loans to bank subsidiary	0	0
Loans to nonbank subsidiary	0	0
Allowance for loan losses	(1,077)	(1,054)	(933)	(977)
Total finance receivables and loans, net	109,799	110,546
Investment in operating leases, net	14,958	16,271
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	1,828	1,801
Other assets	6,582	6,321
Total assets	156,505	158,581	153,324
Noninterest-bearing deposit liabilities	92	89
Interest-bearing deposit liabilities	70,173	66,389
Total deposit liabilities	70,265	66,478
Short-term borrowings	5,365	8,101
Long-term debt	62,044	66,234
Debt Payable To Nonbank Subsidiaries	0	0
Payables to Bank Subsidiaries	0	0
Payables to Nonbank Subsidiaries	0	0
Interest payable	374	350
Unearned insurance premiums and service revenue	2,449	2,434
Accrued expenses and other liabilities	2,185	1,545
Total liabilities	142,682	145,142
Total equity	13,823	13,439	15,934	15,399
Total liabilities and equity	156,505	158,581
Parent [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Noninterest-bearing cash and cash equivalents	1,045	1,234
Interest-bearing cash and cash equivalents	700	401
Total cash and cash equivalents	1,745	1,635	2,645	2,286
Available-for-sale securities	0	0
Held-to-maturity securities	0
Loans held-for-sale, net	0	0
Finance receivables and loans, net	3,282	2,636
Loans to bank subsidiary	775	600
Loans to nonbank subsidiary	2,322	3,277
Allowance for loan losses	(82)	(72)
Total finance receivables and loans, net	6,297	6,441
Investment in operating leases, net	70	81
Receivables from bank subsidiary	316	186
Receivables from nonbank subsidiary	141	259
Investment in bank subsidiaries	16,856	16,496
Investment in nonbank subsidiaries	10,500	10,902
Premiums receivable and other insurance assets	0	0
Other assets	4,697	4,785
Total assets	40,622	40,785
Noninterest-bearing deposit liabilities	0	0
Interest-bearing deposit liabilities	218	229
Total deposit liabilities	218	229
Short-term borrowings	3,640	3,453
Long-term debt	20,676	21,048
Debt Payable To Nonbank Subsidiaries	1,341	1,409
Payables to Bank Subsidiaries	262	142
Payables to Nonbank Subsidiaries	137	420
Interest payable	237	258
Unearned insurance premiums and service revenue	0	0
Accrued expenses and other liabilities	288	387
Total liabilities	26,799	27,346
Total equity	13,823	13,439
Total liabilities and equity	40,622	40,785
Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Noninterest-bearing cash and cash equivalents	0	0
Interest-bearing cash and cash equivalents	0	0
Total cash and cash equivalents	0	0	0	0
Available-for-sale securities	0	0
Held-to-maturity securities	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	16,856	16,496
Investment in nonbank subsidiaries	11	11
Premiums receivable and other insurance assets	0	0
Other assets	0	0
Total assets	16,867	16,507
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	16,785	16,425
Total liabilities and equity	16,867	16,507
Non-Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Noninterest-bearing cash and cash equivalents	861	914
Interest-bearing cash and cash equivalents	2,395	3,831
Total cash and cash equivalents	3,993	5,595	5,608	3,905
Available-for-sale securities	18,180	17,157
Held-to-maturity securities	118
Loans held-for-sale, net	39	105
Finance receivables and loans, net	107,594	108,964
Loans to bank subsidiary	0	0
Loans to nonbank subsidiary	604	559
Allowance for loan losses	(995)	(982)
Total finance receivables and loans, net	107,203	108,541
Investment in operating leases, net	14,888	16,190
Receivables from bank subsidiary	0	0
Receivables from nonbank subsidiary	41	282
Investment in bank subsidiaries	0	0
Investment in nonbank subsidiaries	0	0
Premiums receivable and other insurance assets	1,852	1,827
Other assets	4,951	4,488
Total assets	151,265	154,185
Noninterest-bearing deposit liabilities	92	89
Interest-bearing deposit liabilities	69,955	66,160
Total deposit liabilities	70,047	66,249
Short-term borrowings	1,725	4,648
Long-term debt	41,368	45,186
Debt Payable To Nonbank Subsidiaries	3,097	3,877
Payables to Bank Subsidiaries	0	0
Payables to Nonbank Subsidiaries	122	191
Interest payable	137	92
Unearned insurance premiums and service revenue	2,449	2,434
Accrued expenses and other liabilities	4,883	4,028
Total liabilities	123,828	126,705
Total equity	27,437	27,480
Total liabilities and equity	151,265	154,185
Consolidation, Eliminations [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Noninterest-bearing cash and cash equivalents	0	0
Interest-bearing cash and cash equivalents	0	0
Total cash and cash equivalents	(737)	(850)	$ (617)	$ (615)
Available-for-sale securities	0	0
Held-to-maturity securities	0
Loans held-for-sale, net	0	0
Finance receivables and loans, net	0	0
Loans to bank subsidiary	(775)	(600)
Loans to nonbank subsidiary	(2,926)	(3,836)
Allowance for loan losses	0	0
Total finance receivables and loans, net	(3,701)	(4,436)
Investment in operating leases, net	0	0
Receivables from bank subsidiary	(316)	(186)
Receivables from nonbank subsidiary	(182)	(541)
Investment in bank subsidiaries	(33,712)	(32,992)
Investment in nonbank subsidiaries	(10,511)	(10,913)
Premiums receivable and other insurance assets	(24)	(26)
Other assets	(3,066)	(2,952)
Total assets	(52,249)	(52,896)
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	(4,438)	(5,286)
Payables to Bank Subsidiaries	(262)	(142)
Payables to Nonbank Subsidiaries	(259)	(611)
Interest payable	0	0
Unearned insurance premiums and service revenue	0	0
Accrued expenses and other liabilities	(3,068)	(2,952)
Total liabilities	(8,027)	(8,991)
Total equity	(44,222)	(43,905)
Total liabilities and equity	(52,249)	(52,896)
Affiliated Entity [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Interest-bearing cash and cash equivalents	0	0
Affiliated Entity [Member] | Parent [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Interest-bearing cash and cash equivalents	0	0
Affiliated Entity [Member] | Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Interest-bearing cash and cash equivalents	0	0
Affiliated Entity [Member] | Non-Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Interest-bearing cash and cash equivalents	737	850
Affiliated Entity [Member] | Consolidation, Eliminations [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Interest-bearing cash and cash equivalents	$ (737)	$ (850)