Debt (Debt With A Contractual Term Greater Than One Year) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term debt, net	$ 5,751,859	$ 5,670,818
Current portion of long-term debt, net	(1,084,884)	(838,349)
Long-term debt	$ 4,666,975	$ 4,832,469
3.88% Medium-term notes due in 2016
Debt Instrument [Line Items]
Stated interest rate		3.88%
2.70% Medium-term notes due in 2017
Debt Instrument [Line Items]
Stated interest rate	2.70%
1.55% Medium-term notes due in 2017
Debt Instrument [Line Items]
Stated interest rate	1.55%
6.80% Medium-term notes due 2018
Debt Instrument [Line Items]
Stated interest rate	6.80%
2.40% Medium-term notes due 2019
Debt Instrument [Line Items]
Stated interest rate	2.40%
2.25% Medium-term notes due 2019
Debt Instrument [Line Items]
Stated interest rate	2.25%
2.15% Medium-term notes due 2020
Debt Instrument [Line Items]
Stated interest rate	2.15%
2.85% Medium-term notes due 2021
Debt Instrument [Line Items]
Stated interest rate	2.85%
3.50% Senior unsecured notes due in 2025
Debt Instrument [Line Items]
Stated interest rate	3.50%
4.625% Senior unsecured notes due in 2045
Debt Instrument [Line Items]
Stated interest rate	4.625%
Secured Debt
Debt Instrument [Line Items]
Less: unamortized discount and debt issuance costs	$ (1,480)	$ (3,777)
Long-term debt, net	945,613	1,613,216
Secured Debt \| Asset-backed Canadian commercial paper conduit facility
Debt Instrument [Line Items]
Long-term Debt, Gross	149,338	153,839
Secured Debt \| Term asset-backed securitization debt, VIE
Debt Instrument [Line Items]
Long-term Debt, Gross	797,755	1,463,154
Senior Unsecured Debt
Debt Instrument [Line Items]
Less: unamortized discount and debt issuance costs	(21,242)	(21,106)
Senior Unsecured Debt \| 3.88% Medium-term notes due in 2016
Debt Instrument [Line Items]
Long-term Debt, Gross	0	450,000
Senior Unsecured Debt \| 2.70% Medium-term notes due in 2017
Debt Instrument [Line Items]
Long-term Debt, Gross	400,000	400,000
Senior Unsecured Debt \| 1.55% Medium-term notes due in 2017
Debt Instrument [Line Items]
Long-term Debt, Gross	400,000	400,000
Senior Unsecured Debt \| 6.80% Medium-term notes due 2018
Debt Instrument [Line Items]
Long-term Debt, Gross	877,488	878,708
Senior Unsecured Debt \| 2.40% Medium-term notes due 2019
Debt Instrument [Line Items]
Long-term Debt, Gross	600,000	600,000
Senior Unsecured Debt \| 2.25% Medium-term notes due 2019
Debt Instrument [Line Items]
Long-term Debt, Gross	600,000	0
Senior Unsecured Debt \| 2.15% Medium-term notes due 2020
Debt Instrument [Line Items]
Long-term Debt, Gross	600,000	600,000
Senior Unsecured Debt \| 2.85% Medium-term notes due 2021
Debt Instrument [Line Items]
Long-term Debt, Gross	600,000	0
Senior Unsecured Debt \| 3.50% Senior unsecured notes due in 2025
Debt Instrument [Line Items]
Long-term Debt, Gross	450,000	450,000
Senior Unsecured Debt \| 4.625% Senior unsecured notes due in 2045
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 300,000	$ 300,000

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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 FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: 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(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

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Amount of unamortized debt discount (premium) and debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. 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 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: 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(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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