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Derivative Financial Instruments (Narrative) (Details) - Cash Flow Hedging [Member]
$ in Millions
Mar. 31, 2019
contract
Jun. 24, 2018
USD ($)
Mar. 27, 2016
USD ($)
contract
Interest Rate Swap at 4.39% [Member]      
Derivative [Line Items]      
Number of derivative instruments | contract     4
Derivative, amount of hedged item | $     $ 500
Average rate     4.39%
Interest Rate Swap at 4.63% [Member]      
Derivative [Line Items]      
Number of derivative instruments | contract 4    
Derivative, amount of hedged item | $   $ 500  
Derivative, forward interest rate   4.63%