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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%