v3.10.0.1

Long-lived Assets (Schedule of PP&E) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	$ 27,393.2	$ 26,747.4
Accumulated depreciation	(13,340.2)	(12,502.1)
Total property and equipment, net	14,053.0	14,245.3
Distribution systems
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	17,714.5	17,522.9
Customer premises equipment
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	4,633.9	4,434.3
Support equipment, buildings and land
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	$ 5,044.8	$ 4,790.2

X

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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