Parent And Guarantor Consolidating Financial Statements (Schedule Of Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Millions	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and Due from Banks	$ 1,666		$ 1,348
Interest-bearing Deposits in Banks and Other Financial Institutions	3,561		4,228
Total cash and cash equivalents	5,227		5,576	$ 5,699		$ 5,531
Investment securities	18,758		16,137
Loans held-for-sale, net	37		2,003
Finance receivables and loans, net	107,991		99,948
Loans to bank subsidiary			0
Loans to nonbank subsidiary	0		0
Allowance for loan losses	(1,018)	$ (974)	(977)	(1,113)	$ (1,171)	(1,208)
Total finance receivables and loans, net	106,973		98,971
Investment in operating leases, net	17,292		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	1,794		1,695
Other Assets	6,024		7,302
Assets of operations held-for-sale	0		634
Total assets	156,105		151,828	149,195
Noninterest-bearing deposit liabilities	91		64
Interest-bearing deposit liabilities	63,950		58,158
Total deposit liabilities	64,041		58,222
Short-term borrowings	5,378		7,062
Long-term debt	67,461		66,558
Debt Payable To Nonbank Subsidiaries	0		0
Payables to Bank Subsidiaries	0		0
Payables to Nonbank Subsidiaries	0		0
Interest payable	437		477
Unearned insurance premiums and service revenue	2,438		2,375
Accrued expenses and other liabilities	1,751		1,735
Total liabilities	141,506		136,429
Total equity	14,599		15,399	15,190		14,208
Total liabilities and equity	156,105		151,828
Parent [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and Due from Banks	797		986
Interest-bearing Deposits in Banks and Other Financial Institutions	1,201		1,300
Total cash and cash equivalents	1,998		2,286	2,232		2,930
Investment securities	0		0
Loans held-for-sale, net	0		3
Finance receivables and loans, net	3,818		4,225
Loans to bank subsidiary			625
Loans to nonbank subsidiary	1,781		3,500
Allowance for loan losses	(86)		(102)
Total finance receivables and loans, net	5,513		8,248
Investment in operating leases, net	92		0
Receivables from bank subsidiary	338		219
Receivables from nonbank subsidiary	218		267
Investment in bank subsidiaries	16,296		15,967
Investment in nonbank subsidiaries	10,931		11,559
Premiums receivable and other insurance assets	0		0
Other Assets	4,932		4,889
Assets of operations held-for-sale			634
Total assets	40,318		44,072
Noninterest-bearing deposit liabilities	0		0
Interest-bearing deposit liabilities	248		319
Total deposit liabilities	248		319
Short-term borrowings	3,458		3,338
Long-term debt	19,820		21,199
Debt Payable To Nonbank Subsidiaries	1,268		2,385
Payables to Bank Subsidiaries	24		94
Payables to Nonbank Subsidiaries	374		454
Interest payable	223		316
Unearned insurance premiums and service revenue	0		0
Accrued expenses and other liabilities	304		568
Total liabilities	25,719		28,673
Total equity	14,599		15,399
Total liabilities and equity	40,318		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	0		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	16,296		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	16,308		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	16,226		15,897
Total liabilities and equity	16,308		15,979
Non-Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and Due from Banks	869		362
Interest-bearing Deposits in Banks and Other Financial Institutions	2,360		2,928
Total cash and cash equivalents	3,951		3,905	3,880		2,974
Investment securities	18,758		16,137
Loans held-for-sale, net	37		2,000
Finance receivables and loans, net	104,173		95,723
Loans to bank subsidiary			0
Loans to nonbank subsidiary	546		1,770
Allowance for loan losses	(932)		(875)
Total finance receivables and loans, net	103,787		96,618
Investment in operating leases, net	17,200		19,510
Receivables from bank subsidiary	0		0
Receivables from nonbank subsidiary	242		393
Investment in bank subsidiaries	0		0
Investment in nonbank subsidiaries	0		0
Premiums receivable and other insurance assets	1,816		1,717
Other Assets	3,971		4,879
Assets of operations held-for-sale			0
Total assets	149,762		145,159
Noninterest-bearing deposit liabilities	91		64
Interest-bearing deposit liabilities	63,702		57,839
Total deposit liabilities	63,793		57,903
Short-term borrowings	1,920		3,724
Long-term debt	47,641		45,359
Debt Payable To Nonbank Subsidiaries	1,781		4,125
Payables to Bank Subsidiaries	0		0
Payables to Nonbank Subsidiaries	420		354
Interest payable	214		161
Unearned insurance premiums and service revenue	2,438		2,375
Accrued expenses and other liabilities	4,245		3,551
Total liabilities	122,452		117,552
Total equity	27,310		27,607
Total liabilities and equity	149,762		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	(722)		(615)	$ (413)		$ (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	(2,327)		(5,270)
Allowance for loan losses	0		0
Total finance receivables and loans, net	(2,327)		(5,895)
Investment in operating leases, net	0		0
Receivables from bank subsidiary	(338)		(219)
Receivables from nonbank subsidiary	(460)		(660)
Investment in bank subsidiaries	(32,592)		(31,934)
Investment in nonbank subsidiaries	(10,943)		(11,571)
Premiums receivable and other insurance assets	(22)		(22)
Other Assets	(2,879)		(2,466)
Assets of operations held-for-sale			0
Total assets	(50,283)		(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	(3,049)		(6,510)
Payables to Bank Subsidiaries	(24)		(94)
Payables to Nonbank Subsidiaries	(794)		(808)
Interest payable	0		0
Unearned insurance premiums and service revenue	0		0
Accrued expenses and other liabilities	(2,880)		(2,466)
Total liabilities	(6,747)		(9,878)
Total equity	(43,536)		(43,504)
Total liabilities and equity	(50,283)		(53,382)
Fair Value Option Election, Fair Value [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Finance receivables and loans, net	107,991		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	722		615
Affiliated Entity [Member] | Consolidation, Eliminations [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Interest-bearing Deposits in Banks and Other Financial Institutions	$ (722)		$ (615)