Parent And Guarantor Consolidating Financial Statements (Schedule Of Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Condensed Balance Sheet Statements, Captions [Line Items]
Noninterest-bearing cash and cash equivalents	$ 1,790		$ 2,148
Interest-bearing cash and cash equivalents	3,941		4,232
Total cash and cash equivalents	5,731		6,380	$ 5,858		$ 5,576
Available-for-sale securities	18,197		17,157
Held-to-maturity securities	571		0
Loans held-for-sale, net	15		105
Finance receivables and loans, net	112,653		111,600	105,172
Loans to bank subsidiary	0		0
Loans to nonbank subsidiary	0		0
Allowance for loan losses	(1,089)	$ (1,077)	(1,054)	(974)	$ (933)	(977)
Total finance receivables and loans, net	111,564		110,546
Investment in operating leases, net	13,755		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	1,844		1,801
Other assets	6,254		6,321
Total assets	157,931		158,581	156,278
Noninterest-bearing deposit liabilities	94		89
Interest-bearing deposit liabilities	72,708		66,389
Total deposit liabilities	72,802		66,478
Short-term borrowings	5,994		8,101
Long-term debt	61,040		66,234
Debt Payable To Nonbank Subsidiaries	0		0
Payables to Bank Subsidiaries	0		0
Payables to Nonbank Subsidiaries	0		0
Interest payable	427		350
Unearned insurance premiums and service revenue	2,465		2,434
Accrued expenses and other liabilities	1,592		1,545
Total liabilities	144,320		145,142
Total equity	13,611		13,439	14,295		15,399
Total liabilities and equity	157,931		158,581
Parent [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Noninterest-bearing cash and cash equivalents	796		1,234
Interest-bearing cash and cash equivalents	700		401
Total cash and cash equivalents	1,496		1,635	2,180		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	3,162		2,636
Loans to bank subsidiary	1,400		600
Loans to nonbank subsidiary	2,319		3,277
Allowance for loan losses	(76)		(72)
Total finance receivables and loans, net	6,805		6,441
Investment in operating leases, net	59		81
Receivables from bank subsidiary	293		186
Receivables from nonbank subsidiary	91		259
Investment in bank subsidiaries	17,257		16,496
Investment in nonbank subsidiaries	10,837		10,902
Premiums receivable and other insurance assets	0		0
Other assets	4,537		4,785
Total assets	41,375		40,785
Noninterest-bearing deposit liabilities	0		0
Interest-bearing deposit liabilities	200		229
Total deposit liabilities	200		229
Short-term borrowings	3,576		3,453
Long-term debt	21,625		21,048
Debt Payable To Nonbank Subsidiaries	1,400		1,409
Payables to Bank Subsidiaries	203		142
Payables to Nonbank Subsidiaries	164		420
Interest payable	251		258
Unearned insurance premiums and service revenue	0		0
Accrued expenses and other liabilities	345		387
Total liabilities	27,764		27,346
Total equity	13,611		13,439
Total liabilities and equity	41,375		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	17,257		16,496
Investment in nonbank subsidiaries	1		11
Premiums receivable and other insurance assets	0		0
Other assets	0		0
Total assets	17,258		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	0		82
Total liabilities	0		82
Total equity	17,258		16,425
Total liabilities and equity	17,258		16,507
Non-Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Noninterest-bearing cash and cash equivalents	994		914
Interest-bearing cash and cash equivalents	3,241		3,831
Total cash and cash equivalents	5,074		5,595	4,422		3,905
Available-for-sale securities	18,197		17,157
Held-to-maturity securities	571
Loans held-for-sale, net	15		105
Finance receivables and loans, net	109,491		108,964
Loans to bank subsidiary	0		0
Loans to nonbank subsidiary	561		559
Allowance for loan losses	(1,013)		(982)
Total finance receivables and loans, net	109,039		108,541
Investment in operating leases, net	13,696		16,190
Receivables from bank subsidiary	0		0
Receivables from nonbank subsidiary	124		282
Investment in bank subsidiaries	0		0
Investment in nonbank subsidiaries	0		0
Premiums receivable and other insurance assets	1,868		1,827
Other assets	4,612		4,488
Total assets	153,196		154,185
Noninterest-bearing deposit liabilities	94		89
Interest-bearing deposit liabilities	72,508		66,160
Total deposit liabilities	72,602		66,249
Short-term borrowings	2,418		4,648
Long-term debt	39,415		45,186
Debt Payable To Nonbank Subsidiaries	3,719		3,877
Payables to Bank Subsidiaries	0		0
Payables to Nonbank Subsidiaries	165		191
Interest payable	176		92
Unearned insurance premiums and service revenue	2,465		2,434
Accrued expenses and other liabilities	4,142		4,028
Total liabilities	125,102		126,705
Total equity	28,094		27,480
Total liabilities and equity	153,196		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	(839)		(850)	$ (744)		$ (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	(1,400)		(600)
Loans to nonbank subsidiary	(2,880)		(3,836)
Allowance for loan losses	0		0
Total finance receivables and loans, net	(4,280)		(4,436)
Investment in operating leases, net	0		0
Receivables from bank subsidiary	(293)		(186)
Receivables from nonbank subsidiary	(215)		(541)
Investment in bank subsidiaries	(34,514)		(32,992)
Investment in nonbank subsidiaries	(10,838)		(10,913)
Premiums receivable and other insurance assets	(24)		(26)
Other assets	(2,895)		(2,952)
Total assets	(53,898)		(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	(5,119)		(5,286)
Payables to Bank Subsidiaries	(203)		(142)
Payables to Nonbank Subsidiaries	(329)		(611)
Interest payable	0		0
Unearned insurance premiums and service revenue	0		0
Accrued expenses and other liabilities	(2,895)		(2,952)
Total liabilities	(8,546)		(8,991)
Total equity	(45,352)		(43,905)
Total liabilities and equity	(53,898)		(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	839		850
Affiliated Entity [Member] | Consolidation, Eliminations [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Interest-bearing cash and cash equivalents	$ (839)		$ (850)