Parent And Guarantor Consolidating Financial Statements (Schedule Of Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Millions	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and Due from Banks	$ 1,739		$ 1,348
Interest-bearing Deposits in Banks and Other Financial Institutions	4,119		4,228
Total cash and cash equivalents	5,858		5,576	$ 5,777		$ 5,531
Investment securities	19,142		16,137
Loans held-for-sale, net	1,438		2,003
Finance receivables and loans, net	105,173		99,948
Loans to bank subsidiary			0
Loans to nonbank subsidiary	0		0
Allowance for loan losses	(974)	$ (933)	(977)	(1,171)	$ (1,192)	(1,208)
Total finance receivables and loans, net	104,199		98,971
Investment in operating leases, net	17,950		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	1,759		1,695
Other Assets	6,126		7,302
Assets of operations held-for-sale	0		634
Total assets	156,472		151,828	149,937
Noninterest-bearing deposit liabilities	89		64
Interest-bearing deposit liabilities	61,858		58,158
Total deposit liabilities	61,947		58,222
Short-term borrowings	10,013		7,062
Long-term debt	65,852		66,558
Debt Payable To Nonbank Subsidiaries	0		0
Payables to Bank Subsidiaries	0		0
Payables to Nonbank Subsidiaries	0		0
Interest payable	418		477
Unearned insurance premiums and service revenue	2,417		2,375
Accrued expenses and other liabilities	1,530		1,735
Total liabilities	142,177		136,429
Total equity	14,295		15,399	14,878		14,208
Total liabilities and equity	156,472		151,828
Parent [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and Due from Banks	929		986
Interest-bearing Deposits in Banks and Other Financial Institutions	1,251		1,300
Total cash and cash equivalents	2,180		2,286	2,340		2,930
Investment securities	0		0
Loans held-for-sale, net	0		3
Finance receivables and loans, net	3,376		4,225
Loans to bank subsidiary			625
Loans to nonbank subsidiary	1,615		3,500
Allowance for loan losses	(82)		(102)
Total finance receivables and loans, net	4,909		8,248
Investment in operating leases, net	0		0
Receivables from bank subsidiary	525		219
Receivables from nonbank subsidiary	169		267
Investment in bank subsidiaries	15,974		15,967
Investment in nonbank subsidiaries	11,318		11,559
Premiums receivable and other insurance assets	0		0
Other Assets	4,800		4,889
Assets of operations held-for-sale			634
Total assets	39,875		44,072
Noninterest-bearing deposit liabilities	0		0
Interest-bearing deposit liabilities	247		319
Total deposit liabilities	247		319
Short-term borrowings	3,459		3,338
Long-term debt	19,567		21,199
Debt Payable To Nonbank Subsidiaries	1,255		2,385
Payables to Bank Subsidiaries	29		94
Payables to Nonbank Subsidiaries	369		454
Interest payable	250		316
Unearned insurance premiums and service revenue	0		0
Accrued expenses and other liabilities	404		568
Total liabilities	25,580		28,673
Total equity	14,295		15,399
Total liabilities and equity	39,875		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
Investment securities	0		0
Loans held-for-sale, net	0		0
Finance receivables and loans, net	0		0
Loans to bank subsidiary			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	15,974		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	15,986		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	15,904		15,897
Total liabilities and equity	15,986		15,979
Non-Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and Due from Banks	810		362
Interest-bearing Deposits in Banks and Other Financial Institutions	2,868		2,928
Total cash and cash equivalents	4,422		3,905	3,823		2,974
Investment securities	19,142		16,137
Loans held-for-sale, net	1,438		2,000
Finance receivables and loans, net	101,797		95,723
Loans to bank subsidiary			0
Loans to nonbank subsidiary	511		1,770
Allowance for loan losses	(892)		(875)
Total finance receivables and loans, net	101,416		96,618
Investment in operating leases, net	17,950		19,510
Receivables from bank subsidiary	0		0
Receivables from nonbank subsidiary	270		393
Investment in bank subsidiaries	0		0
Investment in nonbank subsidiaries	0		0
Premiums receivable and other insurance assets	1,780		1,717
Other Assets	3,944		4,879
Assets of operations held-for-sale			0
Total assets	150,362		145,159
Noninterest-bearing deposit liabilities	89		64
Interest-bearing deposit liabilities	61,611		57,839
Total deposit liabilities	61,700		57,903
Short-term borrowings	6,554		3,724
Long-term debt	46,285		45,359
Debt Payable To Nonbank Subsidiaries	1,615		4,125
Payables to Bank Subsidiaries	0		0
Payables to Nonbank Subsidiaries	587		354
Interest payable	168		161
Unearned insurance premiums and service revenue	2,417		2,375
Accrued expenses and other liabilities	3,662		3,551
Total liabilities	122,988		117,552
Total equity	27,374		27,607
Total liabilities and equity	150,362		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	(744)		(615)	$ (412)		$ (410)
Investment securities	0		0
Loans held-for-sale, net	0		0
Finance receivables and loans, net	0		0
Loans to bank subsidiary			(625)
Loans to nonbank subsidiary	(2,126)		(5,270)
Allowance for loan losses	0		0
Total finance receivables and loans, net	(2,126)		(5,895)
Investment in operating leases, net	0		0
Receivables from bank subsidiary	(525)		(219)
Receivables from nonbank subsidiary	(439)		(660)
Investment in bank subsidiaries	(31,948)		(31,934)
Investment in nonbank subsidiaries	(11,330)		(11,571)
Premiums receivable and other insurance assets	(21)		(22)
Other Assets	(2,618)		(2,466)
Assets of operations held-for-sale			0
Total assets	(49,751)		(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	(2,870)		(6,510)
Payables to Bank Subsidiaries	(29)		(94)
Payables to Nonbank Subsidiaries	(956)		(808)
Interest payable	0		0
Unearned insurance premiums and service revenue	0		0
Accrued expenses and other liabilities	(2,618)		(2,466)
Total liabilities	(6,473)		(9,878)
Total equity	(43,278)		(43,504)
Total liabilities and equity	(49,751)		(53,382)
Fair Value Option Election, Fair Value [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Finance receivables and loans, net	105,173		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	744		615
Affiliated Entity [Member] | Consolidation, Eliminations [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Interest-bearing Deposits in Banks and Other Financial Institutions	$ (744)		$ (615)