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Recent Accounting Pronouncements (Recently Adopted Accounting Standards) (Lease Accounting) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Accounting Policies [Abstract]      
Lease right-of-use asset, net $ 12,465.6 $ 12,500.0 $ 0.0
Operating Lease, Liability $ 12,585.1 $ 12,500.0