Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
OPERATING ACTIVITIES:
Net income	$ 1,358.8us-gaap_NetIncomeLoss	$ 1,171.3us-gaap_NetIncomeLoss	$ 1,111.6us-gaap_NetIncomeLoss
Adjustments to reconcile net income to cash provided by operations:
Depreciation for Property, plant and equipment	285.2us-gaap_Depreciation	210.7us-gaap_Depreciation	188.8us-gaap_Depreciation
Depreciation for Equipment on operating leases and other	632.5	600.0	512.1
Provision for losses on financial services receivables	15.4	12.9	20.0
Deferred taxes	(98.0)us-gaap_DeferredIncomeTaxExpenseBenefit	97.3us-gaap_DeferredIncomeTaxExpenseBenefit	151.7us-gaap_DeferredIncomeTaxExpenseBenefit
Other, net	40.4us-gaap_OtherNoncashIncomeExpense	36.6us-gaap_OtherNoncashIncomeExpense	34.0us-gaap_OtherNoncashIncomeExpense
Pension contributions	(81.1)	(26.2)	(190.8)
Change in operating assets and liabilities:
Trade and other receivables	(71.3)	(115.0)	75.2
Wholesale receivables on new trucks	(232.8)	(82.5)	(6.5)
Sales-type finance leases and dealer direct loans on new trucks	(133.1)	(101.9)	(186.6)
Inventories	(189.5)us-gaap_IncreaseDecreaseInInventories	(39.6)us-gaap_IncreaseDecreaseInInventories	(61.5)us-gaap_IncreaseDecreaseInInventories
Other assets, net	(72.0)	(86.9)	(120.7)
Increase (decrease) in liabilities:
Accounts payable and accrued expenses	252.3	240.8	(303.6)
Residual value guarantees and deferred revenues	123.1	261.8	204.4
Other liabilities, net	293.7	196.4	90.9
Net Cash Provided by Operating Activities	2,123.6	2,375.7	1,519.0
INVESTING ACTIVITIES:
Originations of retail loans and direct financing leases	(3,114.2)	(2,992.8)	(3,235.5)
Collections on retail loans and direct financing leases	2,847.6	2,469.2	2,404.3
Net decrease (increase) in wholesale receivables on used equipment	1.1	6.5	(5.7)
Purchases of marketable securities	(1,122.5)	(990.1)	(1,048.9)
Proceeds from sales and maturities of marketable securities	997.9	888.9	768.3
Payments for property, plant and equipment	(298.2)	(510.6)	(515.4)
Acquisitions of equipment for operating leases	(1,239.1)	(1,362.2)	(1,288.0)
Proceeds from asset disposals	395.5	340.1	330.2
Other, net			2.7
Net Cash Used in Investing Activities	(1,531.9)	(2,151.0)	(2,588.0)
FINANCING ACTIVITIES:
Payments of cash dividends	(623.8)us-gaap_PaymentsOfDividends	(283.1)us-gaap_PaymentsOfDividends	(809.5)us-gaap_PaymentsOfDividends
Purchases of treasury stock	(42.7)		(162.1)
Proceeds from stock compensation transactions	29.1	31.0	13.9
Net increase (decrease) in commercial paper and short-term bank loans	349.1	(1,039.3)	(365.8)
Proceeds from long-term debt	1,650.8	2,134.1	2,201.1
Payments on long-term debt	(1,883.0)us-gaap_RepaymentsOfLongTermDebt	(568.9)us-gaap_RepaymentsOfLongTermDebt	(668.1)us-gaap_RepaymentsOfLongTermDebt
Net Cash (Used in) Provided by Financing Activities	(520.5)	273.8	209.5
Effect of exchange rate changes on cash	(83.7)	(20.8)	25.2
Net (Decrease) Increase in Cash and Cash Equivalents	(12.5)	477.7	(834.3)
Cash and cash equivalents at beginning of year	1,750.1	1,272.4	2,106.7
Cash and cash equivalents at end of year	$ 1,737.6	$ 1,750.1	$ 1,272.4

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of cash or cash equivalents contributed during the reporting period by the entity to fund its pension plans and its non-pension postretirement benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

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Period Type:	duration

- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

+ References

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

The cash inflow associated with the sale or collection of receivables arising from the financing of goods and services.

+ References

+ Details

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- Definition

The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The cash inflow from the sale of other tangible or intangible assets used to produce goods or deliver services not otherwise defined in the taxonomy.

+ References

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Namespace Prefix:	us-gaap_
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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ References

+ Details

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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