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Stock-Based Compensation (Summary Of Stock Options By Exercise Price Range) (Details)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Outstanding, Number of Shares | shares 168,387,000
Outstanding, Average life 4 years 8 months 12 days
Outstanding, Average price (usd per share) $ 61.73
Exercisable, Number of Shares | shares 164,387,000
Exercisable, Average price (usd per share) $ 61.73
$28.37-$28.37 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Outstanding, Number of Shares | shares 14,725,000
Outstanding, Average life 3 years 1 month 6 days
Outstanding, Average price (usd per share) $ 28.37
Exercisable, Number of Shares | shares 14,725,000
Exercisable, Average price (usd per share) $ 28.37
Exercise price range, Lower limit 28.37
Exercise price range, Upper limit $ 28.37
$46.80-$46.80 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Outstanding, Number of Shares | shares 12,317,000
Outstanding, Average life 4 years 1 month 6 days
Outstanding, Average price (usd per share) $ 46.80
Exercisable, Number of Shares | shares 12,317,000
Exercisable, Average price (usd per share) $ 46.80
Exercise price range, Lower limit 46.80
Exercise price range, Upper limit $ 46.80
$57.34-$57.34 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Outstanding, Number of Shares | shares 45,782,000
Outstanding, Average life 5 years 2 months 12 days
Outstanding, Average price (usd per share) $ 57.34
Exercisable, Number of Shares | shares 43,782,000
Exercisable, Average price (usd per share) $ 57.34
Exercise price range, Lower limit 57.34
Exercise price range, Upper limit $ 57.34
$66.14-$66.14 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Outstanding, Number of Shares | shares 68,913,000
Outstanding, Average life 6 years 1 month 6 days
Outstanding, Average price (usd per share) $ 66.14
Exercisable, Number of Shares | shares 66,913,000
Exercisable, Average price (usd per share) $ 66.14
Exercise price range, Lower limit 66.14
Exercise price range, Upper limit $ 66.14
$74.47-$74.47 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Outstanding, Number of Shares | shares 7,500,000
Outstanding, Average life 2 years 1 month 6 days
Outstanding, Average price (usd per share) $ 74.47
Exercisable, Number of Shares | shares 7,500,000
Exercisable, Average price (usd per share) $ 74.47
Exercise price range, Lower limit 74.47
Exercise price range, Upper limit $ 74.47
$75.09-$75.09 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Outstanding, Number of Shares | shares 2,250,000
Outstanding, Average life 1 year
Outstanding, Average price (usd per share) $ 75.09
Exercisable, Number of Shares | shares 2,250,000
Exercisable, Average price (usd per share) $ 75.09
Exercise price range, Lower limit 75.09
Exercise price range, Upper limit $ 75.09
$83.50-$83.50 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Outstanding, Number of Shares | shares 9,150,000
Outstanding, Average life 1 month 6 days
Outstanding, Average price (usd per share) $ 83.50
Exercisable, Number of Shares | shares 9,150,000
Exercisable, Average price (usd per share) $ 83.50
Exercise price range, Lower limit 83.50
Exercise price range, Upper limit $ 83.50
$93.65-$93.65 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Outstanding, Number of Shares | shares 7,750,000
Outstanding, Average life 1 year 1 month 6 days
Outstanding, Average price (usd per share) $ 93.65
Exercisable, Number of Shares | shares 7,750,000
Exercisable, Average price (usd per share) $ 93.65
Exercise price range, Lower limit 93.65
Exercise price range, Upper limit $ 93.65