Share-Based Compensation And Other Compensation Arrangements (Schedule Of Stock Option Activity) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares, Outstanding at beginning of year	31,431,395
Shares, Granted	6,257,436
Shares, Exercised	(2,801,568)
Shares, Forfeited	(1,097,393)
Shares, Expired	(125,852)
Shares, Outstanding at end of year	33,664,018
Shares, Exercisable at end of year	23,121,336
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted Average Exercise Price Per Share, Outstanding at beginning of year	$ 68.52
Weighted Average Exercise Price Per Share, Granted	$ 75.35
Weighted Average Exercise Price Per Share, Exercised	$ 43.00
Weighted Average Exercise Price Per Share, Forfeited	$ 71.49
Weighted Average Exercise Price Per Share, Expired	$ 70.74
Weighted Average Exercise Price Per Share, Outstanding at end of year	$ 71.81
Weighted Average Exercise Price Per Share, Exercisable at end of year	$ 71.55
Weighted Average Remaining Contractual Life (Years), Outstanding at end of year	6 years 3 months 10 days
Weighted Average Remaining Contractual Life (Years), Exercisable at end of year	5 years 2 months 4 days
Aggregate Intrinsic Value, Outstanding at end of year	$ 232
Aggregate Intrinsic Value, Exercisable at end of year	$ 200