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Accounting Standards ASU 2016-02 Leases and related updates (Details) - Accounting Standards Update 2016-02 [Member]
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Minimum  
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification $ 450
Maximum  
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification $ 550