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Schedule of Long-Term Obligations (Parenthetical) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument
Debt Issuance Costs, Gross	$ 37
Notes payable
Debt Instrument
Debt, Weighted Average Interest Rate	2.10%	2.00%
Other Long Term Debt
Debt Instrument
Debt, Weighted Average Interest Rate	1.90%	1.80%

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Weighted average interest rate of debt outstanding.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration 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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