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Severance, Exit Costs and Asset Impairments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Restructuring Charges	$ 28	$ 8	$ 400
Asset Impairment Charges	78	125	47
Wireless Segment [Member]
Restructuring Charges	25	11	307
Wireline Segment [Member]
Restructuring Charges	$ 3	$ (3)	$ 93

The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value.

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- Definition

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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