Equity Compensation Plans (Schedule Of Share Based Compensation Expenses) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Equity Compensation Plans [Abstract]
Stock options	$ 58		$ 53		$ 54
Restricted stock	25		24		22
Total stock-based compensation expense, net of tax	$ 83	[1]	$ 77	[1]	$ 76	[1]

[1] Stock-based compensation expense (pretax) is included in G&A expenses.