Parent And Guarantor Consolidating Financial Statements (Schedule Of Condensed Consolidating Statement of Cash Flow) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 2,422	$ 1,743
Purchases of available-for-sale securities	(8,657)	(8,165)
Proceeds from sales of available-for-sale securities	6,584	2,865
Proceeds from maturities and repayment of available-for-sale securities	1,536	2,192
Purchases of held-to-maturity securities	(571)	0
Net (increase) decrease in finance receivables and loans	(5,653)	(5,471)
Proceeds from Sale of Loans Held-for-sale	4,156	1,582
Purchases of operating lease assets	(1,472)	(2,348)
Disposals of operating lease assets	3,047	2,709
Payments to Acquire Interest in Subsidiaries and Affiliates	(288)	0
Capital contributions to subsidiaries	0	0
Returns of contributed capital	0	0
Proceeds from sale of business units, net	0	1,049
Increase (Decrease) in Restricted Cash	482	449
Net change in nonmarketable equity investments	(354)	88
Other, net	(69)	(142)
Net cash provided by investing activities	(1,259)	(5,192)
Net change in short-term borrowings	(2,112)	2,945
Net increase in bank deposits	6,308	3,713
Proceeds from issuance of long-term debt	9,020	17,818
Repayments of long-term debt	(14,305)	(18,984)
Net Change in Debt, Intercompany	0	0
Repurchase and Redemption of Preferred Stock	(696)	(442)
Dividends paid on preferred stock	(30)	(1,318)
Dividends paid and returns of contributed capital, Intercompany	0	0
Capital contributions from parent	0	0
Net cash (used in) provided by financing activities	(1,815)	3,732
Effect of exchange-rate changes on cash and cash equivalents	3	(1)
Net (decrease) increase in cash and cash equivalents	(649)	282
Cash and cash equivalents at beginning of period	6,380	5,576
Cash and cash equivalents at end of period	5,731	5,858
Parent [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	132	(64)
Purchases of available-for-sale securities	0	0
Proceeds from sales of available-for-sale securities	0	0
Proceeds from maturities and repayment of available-for-sale securities	0	0
Purchases of held-to-maturity securities	0
Net (increase) decrease in finance receivables and loans	(834)	787
Proceeds from Sale of Loans Held-for-sale	0	0
Purchases of operating lease assets	0	0
Disposals of operating lease assets	9	0
Payments to Acquire Interest in Subsidiaries and Affiliates	(288)
Capital contributions to subsidiaries	(988)	(169)
Returns of contributed capital	1,971	602
Proceeds from sale of business units, net		1,049
Increase (Decrease) in Restricted Cash	1	0
Net change in nonmarketable equity investments	0	0
Other, net	(82)	(10)
Net cash provided by investing activities	(150)	4,857
Net change in short-term borrowings	123	121
Net increase in bank deposits	(29)	(72)
Proceeds from issuance of long-term debt	1,115	3,780
Repayments of long-term debt	(596)	(5,837)
Net Change in Debt, Intercompany	(8)	(1,131)
Repurchase and Redemption of Preferred Stock	(696)	(442)
Dividends paid on preferred stock	(30)	(1,318)
Dividends paid and returns of contributed capital, Intercompany	0	0
Capital contributions from parent	0	0
Net cash (used in) provided by financing activities	(121)	(4,899)
Effect of exchange-rate changes on cash and cash equivalents	0	0
Net (decrease) increase in cash and cash equivalents	(139)	(106)
Cash and cash equivalents at beginning of period	1,635	2,286
Cash and cash equivalents at end of period	1,496	2,180
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	0	525
Purchases of available-for-sale securities	0	0
Proceeds from sales of available-for-sale securities	0	0
Proceeds from maturities and repayment of available-for-sale securities	0	0
Purchases of held-to-maturity securities	0
Net (increase) decrease in finance receivables and loans	0	0
Proceeds from Sale of Loans Held-for-sale	0	0
Purchases of operating lease assets	0	0
Disposals of operating lease assets	0	0
Payments to Acquire Interest in Subsidiaries and Affiliates	0
Capital contributions to subsidiaries	0	(1)
Returns of contributed capital	8	0
Proceeds from sale of business units, net		0
Increase (Decrease) in Restricted Cash	0	0
Net change in nonmarketable equity investments	0	0
Other, net	0	0
Net cash provided by investing activities	8	(1)
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
Repurchase and Redemption of Preferred Stock	0	0
Dividends paid on preferred stock	0	0
Dividends paid and returns of contributed capital, Intercompany	(8)	(525)
Capital contributions from parent	0	1
Net cash (used in) provided by financing activities	(8)	(524)
Effect of exchange-rate changes on cash and cash equivalents	0	0
Net (decrease) increase in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0	0
Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	2,919	2,817
Purchases of available-for-sale securities	(8,657)	(8,165)
Proceeds from sales of available-for-sale securities	6,584	2,865
Proceeds from maturities and repayment of available-for-sale securities	1,536	2,192
Purchases of held-to-maturity securities	(571)
Net (increase) decrease in finance receivables and loans	(4,819)	(6,258)
Proceeds from Sale of Loans Held-for-sale	4,156	1,582
Purchases of operating lease assets	(1,472)	(2,348)
Disposals of operating lease assets	3,038	(2,709)
Payments to Acquire Interest in Subsidiaries and Affiliates	0
Capital contributions to subsidiaries	0	1
Returns of contributed capital	0	0
Proceeds from sale of business units, net		0
Increase (Decrease) in Restricted Cash	481	449
Net change in nonmarketable equity investments	(354)	88
Other, net	13	(132)
Net cash provided by investing activities	(67)	(5,758)
Net change in short-term borrowings	(2,235)	2,824
Net increase in bank deposits	6,337	3,785
Proceeds from issuance of long-term debt	7,905	14,038
Repayments of long-term debt	(13,709)	(13,147)
Net Change in Debt, Intercompany	(62)	(2,597)
Repurchase and Redemption of Preferred Stock	0	0
Dividends paid on preferred stock	0	0
Dividends paid and returns of contributed capital, Intercompany	(2,600)	(1,612)
Capital contributions from parent	988	168
Net cash (used in) provided by financing activities	(3,376)	3,459
Effect of exchange-rate changes on cash and cash equivalents	3	(1)
Net (decrease) increase in cash and cash equivalents	(521)	517
Cash and cash equivalents at beginning of period	5,595	3,905
Cash and cash equivalents at end of period	5,074	4,422
Consolidation, Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(629)	(1,535)
Purchases of available-for-sale securities	0	0
Proceeds from sales of available-for-sale securities	0	0
Proceeds from maturities and repayment of available-for-sale securities	0	0
Purchases of held-to-maturity securities	0
Net (increase) decrease in finance receivables and loans	0	0
Proceeds from Sale of Loans Held-for-sale	0	0
Purchases of operating lease assets	0	0
Disposals of operating lease assets	0	0
Payments to Acquire Interest in Subsidiaries and Affiliates	0
Capital contributions to subsidiaries	988	169
Returns of contributed capital	(1,979)	(602)
Proceeds from sale of business units, net		0
Increase (Decrease) in Restricted Cash	0	0
Net change in nonmarketable equity investments	0	0
Other, net	0	0
Net cash provided by investing activities	(1,050)	(4,290)
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	70	3,728
Repurchase and Redemption of Preferred Stock	0	0
Dividends paid on preferred stock	0	0
Dividends paid and returns of contributed capital, Intercompany	2,608	2,137
Capital contributions from parent	(988)	(169)
Net cash (used in) provided by financing activities	1,690	5,696
Effect of exchange-rate changes on cash and cash equivalents	0	0
Net (decrease) increase in cash and cash equivalents	11	(129)
Cash and cash equivalents at beginning of period	(850)	(615)
Cash and cash equivalents at end of period	(839)	(744)
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	61	2,598
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	(2)	1,259
Affiliated Entity [Member] | Consolidation, Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net (increase) decrease in finance receivables and loans	$ (59)	$ (3,857)