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Recent Accounting Pronouncements (Narrative) (Details) - USD ($)
$ in Billions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Jan. 01, 2019
ASU 2016-02 [Member] | Forecast [Member] | Minimum [Member]      
Recent Accounting Pronouncements      
Operating lease, right-of-use asset     $ 1.8
Operating lease, liability     1.8
ASU 2016-02 [Member] | Forecast [Member] | Maximum [Member]      
Recent Accounting Pronouncements      
Operating lease, right-of-use asset     2.0
Operating lease, liability     $ 2.0
Adoption of ASU 2014-09 (Topic 606) [Member]      
Recent Accounting Pronouncements      
Financial statement impact from adoption   $ 0.0  
Cumulative effect adjustment to opening Retained earnings $ 0.0 $ 0.0  
Adoption of ASU 2018-15 [Member]      
Recent Accounting Pronouncements      
Financial statement impact from adoption 0.0    
Capitalized implementation costs $ 0.0