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Stock Transactions And Stock-Based Compensation (Narrative) (Details)
shares in Thousands, $ in Millions
1 Months Ended 12 Months Ended
Jul. 31, 2015
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Jul. 02, 2016
Jul. 16, 2013
shares
Repurchase of common stock authorized, shares | shares           20,000
Stock repurchase program, remaining number of shares authorized to be repurchased, shares | shares   20,000        
Total number of authorized shares to be issued under the 2007 Omnibus Incentive Plan, shares | shares   127,000        
Common shares reserved for issuance under the 2007 Omnibus Incentive Plan, shares | shares   70,000        
Separation conversion factor         1.32  
Aggregate intrinsic value of options exercised   $ 162 $ 210 $ 313    
Cash receipts due to exercise of options   117 161 223    
Employee service share-based compensation, tax benefit from exercise of stock options   $ 85 $ 99 147    
Total number of shares withheld sufficient to fund minimum tax withholding requirements related to exercising of stock options and vesting of RSUs | shares   600 668      
Total value of shares withheld sufficient to fund minimum tax withholding requirements related to exercising of stock options and vesting of RSUs   $ 47 $ 48      
RSUs/PSUs:            
Vesting period of shares (in years)   5 years        
Total unrecognized compensation cost   $ 130        
Weighted average period for cost to be recognized (in years)   2 years        
Employee service share-based compensation, tax benefit from exercise of stock options   $ 35 $ 38 $ 46    
Percentage of awards granted   25.00% 25.00% 25.00%    
PSUs            
Vesting period of shares (in years)   3 years        
Share-based compensation arrangement by share-based payment award, additional holding period   2 years        
Percentage of awards granted   25.00% 25.00% 25.00%    
Stock options            
Vesting period of shares (in years)   5 years        
Stock option term (in years)   10 years        
Total unrecognized compensation cost   $ 117        
Weighted average period for cost to be recognized (in years)   2 years        
Employee service share-based compensation, tax benefit from exercise of stock options   $ 50 $ 61 $ 101    
Percentage of awards granted   50.00% 50.00% 50.00%    
Communications business | Discontinued operations            
Shares held as Treasury shares | shares 26,000     26,000    
ASU No. 2016-09 | Continuing operations            
New accounting pronouncement or change in accounting principle, effect of change on provision for income taxes   $ (55) $ (30)      
New accounting pronouncement or change in accounting principle, effect of change on operating cash flow   $ 55 $ 30