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Notes Payable - Note Issuances (Details) - USD ($)	1 Months Ended			12 Months Ended
	Dec. 31, 2017	Mar. 31, 2017	Oct. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt
Proceeds from issuance of debt						$ 250,000,000
Payments on line of credit				$ 2,475,000,000	$ 2,997,000,000	$ 1,433,000,000
Notes Payable | 4.125% notes, issued in March 2017 and due in October 2026
Debt
Interest rate (as a percent)	4.125%			4.125%
Issuance of Debt		$ 400,000,000
Public offering price	102.98%			102.98%
Effective yield (as a percent)	3.75%			3.75%
Notes Payable | 4.650% notes, issued in March 2017 and due in March 2047
Debt
Interest rate (as a percent)	4.65%			4.65%
Issuance of Debt		300,000,000		$ 300,000,000
Public offering price	99.97%			99.97%
Effective yield (as a percent)	4.65%			4.65%
Notes Payable | 3.250% notes, issued in December 2017 and due in October 2022
Debt
Interest rate (as a percent)	3.25%			3.25%
Issuance of Debt	$ 500,000,000			$ 500,000,000
Public offering price	101.77%			101.77%
Effective yield (as a percent)	2.84%			2.84%
Notes Payable | 3.650% notes, issued in December 2017 and due in January 2028
Debt
Interest rate (as a percent)	3.65%			3.65%
Issuance of Debt				$ 550,000,000
Public offering price	99.78%			99.78%
Effective yield (as a percent)	3.68%			3.68%
Notes Payable | 4.650% notes, issued in December 2017 and due in March 2047
Debt
Interest rate (as a percent)	4.65%			4.65%
Issuance of Debt	$ 250,000,000			$ 250,000,000
Public offering price	105.43%			105.43%
Effective yield (as a percent)	4.32%			4.32%
Notes Payable | 3.000% notes, issued in October 2016 and due in January 2027
Debt
Interest rate (as a percent)	3.00%			3.00%	3.00%
Issuance of Debt					$ 600,000,000
Public offering price					98.67%
Effective yield (as a percent)					3.15%
Notes Payable | Notes issued in December 2017
Debt
Proceeds from issuance of debt	$ 1,300,000,000
Notes Payable | 6.750% notes, issued in September 2007 and due in August 2019
Debt
Interest rate (as a percent)	6.75%			6.75%	6.75%
Early repayment of notes payable				$ 550,000,000
Payments on line of credit	$ 2,000,000,000
Notes Payable | Notes issued in March 2017
Debt
Proceeds from issuance of debt		$ 705,200,000
Notes Payable | Notes issued in October 2016
Debt
Proceeds from issuance of debt			$ 586,700,000

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- Definition

The percentage of the principal amount of the bonds which was paid by the investors.

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Net increase or decrease in the carrying amount of the debt instrument for the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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