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Supplemental Disclosures To The Consolidated Statements Of Cash Flows (Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Supplemental Cash Flow Information [Abstract]
Non-cash issuance of common stock	$ 181	$ 181
Stock-based compensation expense, equity awards	$ 80	$ 83

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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