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Schedule of Long-Term Obligations (Parenthetical) (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Dec. 01, 2017
Notes payable      
Debt Instrument      
Weighted average interest rates 1.40% 1.40%  
Other Long Term Debt      
Debt Instrument      
Weighted average interest rates 1.90% 1.70%  
Credit Agreement      
Debt Instrument      
Weighted average interest rates 2.20% 2.20%  
Current maturities of credit agreement $ 22 $ 18  
Minimum increment | Credit Agreement      
Debt Instrument      
Change in Increments in Commitment Fee     0.025%