Recent Accounting Pronouncements (Recently Adopted Accounting Standards) (Lease Accounting) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Lease right-of-use asset, net	$ 12,522.8	$ 12,500.0	$ 0.0
Operating Lease, Liability	$ 12,638.8	$ 12,500.0