Significant Transactions (Time Warner Cable Merger) (Details) $ in Millions	12 Months Ended
Dec. 31, 2015 USD ($)
Time Warner Cable Merger and Related Divestiture Transactions [Member]
Business Acquisition [Line Items]
Transaction costs and transaction-related costs	$ 198

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration