Long-lived Assets (Schedule of PP&E) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment, gross	36,524.8us-gaap_PropertyPlantAndEquipmentGross	$ 34,901.1us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation	(12,684.2)	(10,926.2)
Total property and equipment, net	23,840.6us-gaap_PropertyPlantAndEquipmentNet	23,974.9us-gaap_PropertyPlantAndEquipmentNet
Distribution Systems [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	26,286.5	25,193.2
Customer Premises Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	6,213.9	6,126.0
Support Equipment, Buildings and Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,024.4	$ 3,581.9
Minimum [Member] \| Distribution Systems [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Minimum [Member] \| Customer Premises Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Minimum [Member] \| Support Equipment, Buildings and Land [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Maximum [Member] \| Distribution Systems [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	30 years
Maximum [Member] \| Customer Premises Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Maximum [Member] \| Support Equipment, Buildings and Land [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	50 years

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

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