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Other Stock-Related Information (Stock Option Activity - Narratives) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule Of Share Based Compensation Stock Options Activity [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate   2.26% 2.506% 1.30%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate   3.14% 4.00% 4.04%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate   26.00% 28.00% 29.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value   $ 360 $ 392 $ 265
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized   739    
Stock or Unit Option Plan Expense   215 231 220
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options   439 490 355
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense   $ 118 $ 128 $ 88
Share Based Compensation Arrangement By Share Based Payment Award FairValue Assumptions Expected Lives        
Stock Option [Member]        
Schedule Of Share Based Compensation Stock Options Activity [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 5.26 $ 4.52 $ 3.8
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options $ 185      
Expected Term Of Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions   P02Y    
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Not Yet Recognized Period For Recognition   P01Y06M