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Equity- (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Feb. 27, 2014
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Feb. 28, 2014
Class of Stock [Line Items]              
Share-based Compensation, Excluding Mergers and Acquisition and and Capitalized Portion   $ 31 $ 23 $ 60 $ 47    
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       $ 112 $ 86    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       580,901      
Granted, Number of options       150,323      
Stock-based compensation       $ 60 47    
Tax benefits from stock option plans           $ 19  
Number of Options, Exercised   559,552   559,552      
Weighted Average Exercise Price, Exercised   $ 151.84   $ 151.84      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value   $ 224.22   $ 224.22   $ 199.44  
Employee Stock Option [Member]              
Class of Stock [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value   $ 7 $ 9 $ 10 $ 14    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   11   $ 11      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       2 years      
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   174   $ 174      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       1 year 7 months 6 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       $ 11      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 39 $ 28   28      
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       $ 13      
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