Share-Based Compensation And Other Compensation Arrangements (Schedule Of Stock Option Activity) (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended			12 Months Ended
	Feb. 28, 2011	Feb. 28, 2010	Feb. 28, 2009	Dec. 31, 2011
Share-Based Compensation And Other Compensation Arrangements [Abstract]
Shares, Outstanding at beginning of year				28,975,442
Shares, Granted	5,426,910	5,932,806	7,423,242	5,658,705
Shares, Exercised				(2,447,099)
Shares, Forfeited				(665,482)
Shares, Expired				(90,171)
Shares, Outstanding at end of year				31,431,395
Shares, Exercisable at end of year				20,488,535
Weighted Average Exercise Price Per Share, Outstanding at beginning of year				$ 65.96
Weighted Average Exercise Price Per Share, Granted				$ 71.29
Weighted Average Exercise Price Per Share, Exercised				$ 46.88
Weighted Average Exercise Price Per Share, Forfeited				$ 61.11
Weighted Average Exercise Price Per Share, Expired				$ 61.88
Weighted Average Exercise Price Per Share, Outstanding at end of year				$ 68.52
Weighted Average Exercise Price Per Share, Exercisable at end of year				$ 71.77
Weighted Average Remaining Contractual Life (Years), Outstanding at end of year				6.58
Weighted Average Remaining Contractual Life (Years), Exercisable at end of year				5.51
Aggregate Intrinsic Value, Outstanding at end of year				$ 290
Aggregate Intrinsic Value, Exercisable at end of year				$ 170