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Supplemental Disclosures To The Consolidated Statements Of Cash Flows (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Supplemental Cash Flow Information [Abstract]
Non-cash issuance of common stock	$ 130	$ 170
Stock-based compensation expense, equity awards	$ 34	$ 41

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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