Share-Based Compensation And Other Compensation Arrangements (Schedule Of Stock Option Activity) (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares, Outstanding at beginning of year | shares	12,925,944
Shares, Exercised | shares	(4,270,336)
Shares, Forfeited | shares	(6,270)
Shares, Expired | shares	(2,726)
Shares, Outstanding at end of year | shares	8,646,612
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	$ 73.44
Weighted Average Exercise Price Per Share, Exercised | $ / shares	75.04
Weighted Average Exercise Price Per Share, Forfeited | $ / shares	84.20
Weighted Average Exercise Price Per Share, Expired | $ / shares	74.43
Weighted Average Exercise Price Per Share, Outstanding at end of year | $ / shares	$ 72.64
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted Average Remaining Contractual Life (Years), Outstanding at end of year	4 years 8 months 1 day
Aggregate Intrinsic Value, Outstanding at end of year | $	$ 718
Shares, Exercisable at end of year | shares	8,640,391
Weighted Average Exercise Price Per Share, Exercisable at end of year | $ / shares	$ 72.60
Weighted Average Remaining Contractual Life (Years), Exercisable at end of year	4 years 8 months 1 day
Aggregate Intrinsic Value, Exercisable at end of year | $	$ 718