Share-Based Compensation And Other Compensation Arrangements (Schedule Of Stock Option Activity) (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares, Outstanding at beginning of year | shares	4,417,218
Shares, Exercised | shares	(1,165,135)
Shares, Outstanding at end of year | shares	3,252,083
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 | $ / shares	$ 71.69
Weighted Average Exercise Price Per Share, Exercised | $ / shares	69.53
Weighted Average Exercise Price Per Share, Outstanding at end of year | $ / shares	$ 72.47
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted Average Remaining Contractual Life (Years), Outstanding at end of year	3 years 2 months 12 days
Aggregate Intrinsic Value, Outstanding at end of year | $	$ 813
Shares, Exercisable at end of year | shares	3,252,083
Weighted Average Exercise Price Per Share, Exercisable at end of year | $ / shares	$ 72.47
Weighted Average Remaining Contractual Life (Years), Exercisable at end of year	3 years 2 months 12 days
Aggregate Intrinsic Value, Exercisable at end of year | $	$ 813