Finance Receivables (Finance Receivables) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	$ 6,560,245,000us-gaap_NotesReceivableGross	$ 6,110,256,000us-gaap_NotesReceivableGross	$ 5,889,519,000us-gaap_NotesReceivableGross	$ 5,912,130,000us-gaap_NotesReceivableGross	$ 6,191,158,000us-gaap_NotesReceivableGross
Allowance for credit losses	(127,364,000)	(110,693,000)	(107,667,000)	(125,449,000)	(173,589,000)
Total of finance receivables, net and investment in retained securitization interests	6,432,881,000us-gaap_NotesReceivableNet	5,999,563,000us-gaap_NotesReceivableNet	5,781,852,000us-gaap_NotesReceivableNet	5,786,681,000us-gaap_NotesReceivableNet	6,017,569,000us-gaap_NotesReceivableNet
Financing Receivable, Individually Evaluated for Impairment	0	0
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	952,321,000	845,212,000	816,404,000	824,640,000	813,997,000
Allowance for credit losses	(5,339,000)	(4,630,000)	(6,225,000)	(9,337,000)
Financing Receivable, Individually Evaluated for Impairment	0	0
Commercial Portfolio Segment [Member] \| United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	903,380,000	800,491,000	776,633,000	778,320,000	735,481,000
Commercial Portfolio Segment [Member] \| Canada [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	48,941,000	44,721,000	39,771,000	46,320,000	78,516,000
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	5,607,924,000	5,265,044,000	5,073,115,000	5,087,490,000	5,377,161,000
Allowance for credit losses	(122,025,000)	(106,063,000)	(101,442,000)	(116,112,000)
Financing Receivable, Individually Evaluated for Impairment	0	0
Consumer Portfolio Segment [Member] \| United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	5,398,006,000	5,051,245,000	4,850,450,000	4,858,781,000	5,126,699,000
Consumer Portfolio Segment [Member] \| Canada [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	$ 209,918,000	$ 213,799,000	$ 222,665,000	$ 228,709,000	$ 250,462,000

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A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

+ Details

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- Definition

The balance of financing receivables that were individually evaluated for impairment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (h)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

+ Details

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- Definition

Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10(3))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Subparagraph 3

-Article 9

+ Details

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- Definition

Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Article 5

+ Details

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