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Recent Accounting Developments Narrative (Details) - USD ($)
$ in Millions
Jan. 01, 2019
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Adoption of ASC 606 revenue from contracts with customers   $ 73
Scenario, Forecast [Member] | Accounting Standards Update 2016-02 [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating Lease, Right-of-Use Asset $ 500  
Operating Lease Liability 500  
Scenario, Forecast [Member] | Maximum [Member] | Accounting Standards Update 2016-02 [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating Lease Liability