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Accounting Pronouncements (Details) - ASU 2016-02 - Subsequent Event
$ in Millions
Jan. 01, 2019
USD ($)
Minimum  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Right-of-use assets $ 415
Lease liabilities 415
Maximum  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Right-of-use assets 465
Lease liabilities $ 465