Parent And Guarantor Consolidating Financial Statements (Schedule Of Condensed Consolidating Statement of Cash Flow) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 247	$ 932
Proceeds from (Payments for) Federal Funds Sold and Securities Purchased under Agreements to Resell, Net	(50)	0
Purchases of available-for-sale securities	(4,023)	(907)
Proceeds from sales of available-for-sale securities	1,523	1,354
Proceeds from maturities of available-for-sale securities	914	592
Net (increase) decrease in finance receivables and loans	(45)	492
Proceeds from Sale of Loans Held-for-sale	1,577
Net (increase) decrease in operating lease assets	(110)	(1,075)
Capital contributions to subsidiaries	0	0
Returns of contributed capital	0	0
Proceeds from sale of business units, net	1,049	0
Increase (Decrease) in Restricted Cash	(121)	1,580
Other, net	91	111
Net cash (used in) provided by investing activities	805	2,147
Net change in short-term borrowings	(618)	(3,384)
Net increase in bank deposits	2,652	2,017
Proceeds from issuance of long-term debt	8,820	9,402
Repayments of long-term debt	(9,778)	(10,683)
Net Change in Debt, Intercompany	0	0
Dividends paid	(67)	(68)
Dividends paid and returns of contributed capital, Intercompany	0	0
Capital contributions from parent	0	0
Net cash provided by (used in) financing activities	1,009	(2,716)
Effect of exchange-rate changes on cash and cash equivalents	(1)	(1)
Cash and Cash Equivalents, Period Increase (Decrease)	2,060	362
Cash and cash equivalents at beginning of period	5,576	5,531
Cash and cash equivalents at end of period	7,636	5,893
Parent [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(189)	(207)
Proceeds from (Payments for) Federal Funds Sold and Securities Purchased under Agreements to Resell, Net	0
Purchases of available-for-sale securities	0	0
Proceeds from sales of available-for-sale securities	0	0
Proceeds from maturities of available-for-sale securities	0	0
Net (increase) decrease in finance receivables and loans	(242)	1,918
Proceeds from Sale of Loans Held-for-sale	0
Net (increase) decrease in operating lease assets	0	563
Capital contributions to subsidiaries	(24)	(651)
Returns of contributed capital	222	295
Proceeds from sale of business units, net	1,049
Increase (Decrease) in Restricted Cash	0	0
Other, net	(1)	(1)
Net cash (used in) provided by investing activities	1,378	2,826
Net change in short-term borrowings	142	179
Net increase in bank deposits	(9)	(19)
Proceeds from issuance of long-term debt	2,467	1,269
Repayments of long-term debt	(3,161)	(4,635)
Net Change in Debt, Intercompany	(202)	85
Dividends paid	(67)	(68)
Dividends paid and returns of contributed capital, Intercompany	0	0
Capital contributions from parent	0	0
Net cash provided by (used in) financing activities	(830)	(3,189)
Effect of exchange-rate changes on cash and cash equivalents	0	0
Cash and Cash Equivalents, Period Increase (Decrease)	359	(570)
Cash and cash equivalents at beginning of period	2,286	2,930
Cash and cash equivalents at end of period	2,645	2,360
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	125	(11)
Proceeds from (Payments for) Federal Funds Sold and Securities Purchased under Agreements to Resell, Net	0
Purchases of available-for-sale securities	0	0
Proceeds from sales of available-for-sale securities	0	0
Proceeds from maturities of available-for-sale securities	0	0
Net (increase) decrease in finance receivables and loans	0	0
Proceeds from Sale of Loans Held-for-sale	0
Net (increase) decrease in operating lease assets	0	0
Capital contributions to subsidiaries	0	0
Returns of contributed capital	0	0
Proceeds from sale of business units, net	0
Increase (Decrease) in Restricted Cash	0	0
Other, net	0	0
Net cash (used in) provided by investing activities	0	0
Net change in short-term borrowings	0	0
Net increase in bank deposits	0	0
Proceeds from issuance of long-term debt	0	0
Repayments of long-term debt	0	0
Net Change in Debt, Intercompany	0	0
Dividends paid	0	0
Dividends paid and returns of contributed capital, Intercompany	(125)	0
Capital contributions from parent	0	0
Net cash provided by (used in) financing activities	(125)	0
Effect of exchange-rate changes on cash and cash equivalents	0	0
Cash and Cash Equivalents, Period Increase (Decrease)	0	(11)
Cash and cash equivalents at beginning of period	0	37
Cash and cash equivalents at end of period	0	26
Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	799	1,271
Proceeds from (Payments for) Federal Funds Sold and Securities Purchased under Agreements to Resell, Net	(50)
Purchases of available-for-sale securities	(4,023)	(907)
Proceeds from sales of available-for-sale securities	1,523	1,354
Proceeds from maturities of available-for-sale securities	914	592
Net (increase) decrease in finance receivables and loans	197	(1,426)
Proceeds from Sale of Loans Held-for-sale	1,577
Net (increase) decrease in operating lease assets	(110)	(1,638)
Capital contributions to subsidiaries	0	0
Returns of contributed capital	0	0
Proceeds from sale of business units, net	0
Increase (Decrease) in Restricted Cash	(121)	1,580
Other, net	92	112
Net cash (used in) provided by investing activities	204	(417)
Net change in short-term borrowings	(760)	(3,563)
Net increase in bank deposits	2,661	2,036
Proceeds from issuance of long-term debt	6,353	8,133
Repayments of long-term debt	(6,617)	(6,048)
Net Change in Debt, Intercompany	(374)	(702)
Dividends paid	0	0
Dividends paid and returns of contributed capital, Intercompany	(586)	(416)
Capital contributions from parent	24	651
Net cash provided by (used in) financing activities	701	91
Effect of exchange-rate changes on cash and cash equivalents	(1)	(1)
Cash and Cash Equivalents, Period Increase (Decrease)	1,703	944
Cash and cash equivalents at beginning of period	3,905	2,974
Cash and cash equivalents at end of period	5,608	3,918
Consolidation, Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(488)	(121)
Proceeds from (Payments for) Federal Funds Sold and Securities Purchased under Agreements to Resell, Net	0
Purchases of available-for-sale securities	0	0
Proceeds from sales of available-for-sale securities	0	0
Proceeds from maturities of available-for-sale securities	0	0
Net (increase) decrease in finance receivables and loans	0	0
Proceeds from Sale of Loans Held-for-sale	0
Net (increase) decrease in operating lease assets	0	0
Capital contributions to subsidiaries	24	651
Returns of contributed capital	(222)	(295)
Proceeds from sale of business units, net	0
Increase (Decrease) in Restricted Cash	0	0
Other, net	0	0
Net cash (used in) provided by investing activities	(777)	(262)
Net change in short-term borrowings	0	0
Net increase in bank deposits	0	0
Proceeds from issuance of long-term debt	0	0
Repayments of long-term debt	0	0
Net Change in Debt, Intercompany	576	617
Dividends paid	0	0
Dividends paid and returns of contributed capital, Intercompany	711	416
Capital contributions from parent	(24)	(651)
Net cash provided by (used in) financing activities	1,263	382
Effect of exchange-rate changes on cash and cash equivalents	0	0
Cash and Cash Equivalents, Period Increase (Decrease)	(2)	(1)
Cash and cash equivalents at beginning of period	(615)	(410)
Cash and cash equivalents at end of period	(617)	(411)
Affiliated Entity [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net (increase) decrease in finance receivables and loans	0	0
Affiliated Entity [Member] | Parent [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net (increase) decrease in finance receivables and loans	374	702
Affiliated Entity [Member] | Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net (increase) decrease in finance receivables and loans	0	0
Affiliated Entity [Member] | Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net (increase) decrease in finance receivables and loans	205	(84)
Affiliated Entity [Member] | Consolidation, Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net (increase) decrease in finance receivables and loans	$ (579)	$ (618)