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Equity- (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 27, 2016
Feb. 27, 2014
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Feb. 28, 2014
Class of Stock [Line Items]                
Share-based Compensation, Excluding Mergers and Acquisition and and Capitalized Portion     $ 30 $ 32 $ 90 $ 79    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate         1.36% 1.25%    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value         $ 120 $ 91    
Stock Repurchased During Period, Shares           2,635,974    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         614,479      
Granted, Number of options         150,323      
Stock-based compensation         $ 90 $ 79    
Tax benefits from stock option plans             $ 19  
Number of Options, Exercised     544,367   544,367      
Weighted Average Exercise Price, Exercised     $ 154.58   $ 154.58      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value     $ 225.54   $ 225.54   $ 199.44  
Payments for Repurchase of Common Stock         $ 0 $ 605    
Stock Repurchase Program, Authorized Amount     $ 1,000   $ 1,000      
Shares Paid for Tax Withholding for Share Based Compensation         208,091 194,696    
Treasury Stock, Value     1,499   $ 1,499   $ 1,448  
Treasury Stock, Retired, Cost Method, Amount             $ (660)  
Employee Stock Option [Member]                
Class of Stock [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value     5   15 $ 19    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized     9   $ 9      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition         1 year 9 months 18 days      
Time Based And Performance Based Restricted Stock [Member]                
Class of Stock [Line Items]                
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized     147   $ 147      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition         1 year 4 months 24 days      
Performance Based Restricted Stock Units [Member]                
Class of Stock [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   165,462            
Stock-based compensation     6   $ 17      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 39 $ 22   22      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   3 years            
Share Based Compensation Arrangement By Share Based Payment Shares Reserved For Future Issuance               330,924
Share Based Estimated Compensation Expense Stock Options Remainder Of Current Fiscal Year         $ 7      
Performance Based Restricted Stock Units [Member] | Maximum [Member]                
Class of Stock [Line Items]                
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 80            
Subsequent Event [Member]                
Class of Stock [Line Items]                
Treasury Stock, Shares, Retired 7,054,703              
Treasury Stock, Retired, Cost Method, Amount $ 1,500              
Subsequent Event [Member] | Additional Paid-in Capital [Member]                
Class of Stock [Line Items]                
Treasury Stock, Retired, Cost Method, Amount 1,100              
Subsequent Event [Member] | Retained Earnings [Member]                
Class of Stock [Line Items]                
Treasury Stock, Retired, Cost Method, Amount $ 371