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Accounting Standards (Details) - Accounting Standards Update 2016-02
$ in Billions
9 Months Ended
Sep. 30, 2019
USD ($)
Operating Lease Right Of Use Asset  
New accounting pronouncement or change in accounting principle, effect of adoption, quantification $ 2.8
Operating Lease Liability  
New accounting pronouncement or change in accounting principle, effect of adoption, quantification $ 2.9