Debt (Debt With A Contractual Term Greater Than One Year) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Gross long-term debt	$ 4,772,843,000us-gaap_LongTermDebt	$ 4,592,853,000us-gaap_LongTermDebt
Long-term Debt, Current Maturities	(1,011,315,000)us-gaap_LongTermDebtCurrent	(1,176,140,000)us-gaap_LongTermDebtCurrent
Long-term debt	3,761,528,000us-gaap_LongTermDebtNoncurrent	3,416,713,000us-gaap_LongTermDebtNoncurrent
Asset-Backed U.S. Commercial Paper Conduit Facility VIE [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Gross long-term debt	166,912,000	174,241,000
Term Asset-Backed Securitization VIEs [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Gross long-term debt	1,271,533,000	1,256,632,000
Long-term Debt, Current Maturities	(366,900,000)	(334,600,000)
Medium-Term Notes Due 2014 [Member]
Debt Instrument [Line Items]
Par value of debt instrument	500,000,000
Weighted average interest rate of asset-backed securitization transactions	5.75%
Medium-Term Notes Due 2014 [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Gross long-term debt	0	499,866,000
Medium-Term Notes Due 2015 [Member]
Debt Instrument [Line Items]
Par value of debt instrument	600,000,000
Weighted average interest rate of asset-backed securitization transactions	1.15%
Medium-Term Notes Due 2015 [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Gross long-term debt	599,817,000	599,543,000
Medium-Term Notes Due 2016 [Member]
Debt Instrument [Line Items]
Par value of debt instrument	450,000,000
Weighted average interest rate of asset-backed securitization transactions	3.88%
Medium-Term Notes Due 2016 [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Gross long-term debt	449,937,000	449,883,000
Medium-Term Notes Due 2017 [Member]
Debt Instrument [Line Items]
Par value of debt instrument	400,000,000
Weighted average interest rate of asset-backed securitization transactions	2.70%
Medium-Term Notes Due 2017 [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Gross long-term debt	399,963,000	399,946,000
Medium-Term Notes Due 2017 1.55 rate [Member] [Member]
Debt Instrument [Line Items]
Par value of debt instrument	400,000,000
Weighted average interest rate of asset-backed securitization transactions	1.55%
Medium-Term Notes Due 2017 1.55 rate [Member] [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Gross long-term debt	399,464,000	0
Medium-Term Notes Due 2018 [Member]
Debt Instrument [Line Items]
Par value of debt instrument	888,000,000
Weighted average interest rate of asset-backed securitization transactions	6.80%
Medium-Term Notes Due 2018 [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Gross long-term debt	887,381,000	909,742,000
Medium-Term Notes Due 2019 [Member]
Debt Instrument [Line Items]
Par value of debt instrument	600,000,000
Weighted average interest rate of asset-backed securitization transactions	2.40%
Medium-Term Notes Due 2019 [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Gross long-term debt	597,836,000	0
Senior Notes Due 2014 [Member]
Debt Instrument [Line Items]
Par value of debt instrument	600,000,000
Weighted average interest rate of asset-backed securitization transactions	15.00%
Senior Notes Due 2014 [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 0	$ 303,000,000

Face (par) amount of debt instrument at time of issuance.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

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-Section 55

-Paragraph 8

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-02.22(a)(1))

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-02.22)

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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

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

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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- Definition

Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ 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 210.5-02.19,20)

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

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

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-Number 210

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

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-Name Regulation S-X (SX)

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ 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 210.5-02.22)

-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 22

-Article 5

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