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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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- Definition 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 + Details
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