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Preferred And Common Stock (Schedule Of Total Compensation Expense Recognized For All Stock Options And Awards) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Preferred And Common Stock [Abstract]
Stock option grants	$ 34	$ 44	$ 53
Stock award grants	49	40	34
Total compensation expense before income taxes	83	84	87
Benefit for income taxes	27	27	29
Total compensation expense, net of income taxes	$ 56	$ 57	$ 58

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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- Definition

Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

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- Definition

The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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