Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

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Description of a specific restructuring plan and related activities including the facts and circumstances leading to the restructuring or decision to exit an activity, and the expected completion date. This concept and related items would be utilized for each plan if multiple exit plans have been implemented in the period.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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Restructuring Charges (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			144 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2025
Employee Separations
Restructuring charge and reserve
Restructuring reserve	$ 37	$ 8
Restructuring charges	45	47	34
Facility Closings
Restructuring charge and reserve
Restructuring reserve	20	31
Benefit (loss) recognized as a result of lease modification	1	7	(2)
Network Related Expenses [Member] \| Employee Separations
Restructuring charge and reserve
Restructuring charges	11	12	8
General and Administrative Expense [Member] \| Employee Separations
Restructuring charge and reserve
Restructuring charges	$ 34	$ 35	$ 26
Subsequent Event [Member]
Restructuring charge and reserve
Restructuring and Related Activities, Description				2025