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Employee Benefit Plans (Stock Based Compensation) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cost of Share Based Payments $ 268 $ 169 $ 129
Equity Awards Vested and Expected to Vest, Remaining Term 2 years 10 months 24 days    
Expected Volatility     19.00%
Expected Volatility, Minimum 18.80% 17.50%  
Expected Volatility, Maximum 19.70% 21.10%  
Expected term (in years)     6 years 6 months
Weighted-average volatility 20.00% 18.00% 19.00%
Expected dividend yield 2.40% 2.20% 2.40%
Risk-free rate, minimum 2.30% 1.30% 0.50%
Risk-free rate, maximum 2.70% 2.70% 2.50%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 184,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 42,000    
Expected Range Of Shares Awarded Annually Under Long Term Incentive Plan 1.0% to 1.5%    
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term (in years) 6 years 6 months 6 years 6 months  
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term (in years) 6 years 7 months 6 days 6 years 7 months 6 days  
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Period Start, Shares 1,603    
Granted, Shares 339    
Exercised/earned, Shares 317    
Cancelled, Shares 57    
Period End, Shares 1,568 1,603  
Period Start, Average Price [1] $ 99.89    
Granted, Average Price [1] 124.72    
Exercised/Earned, Average Price [1] 88.61    
Cancelled, Average Price [1] 121.69    
Period End, Average Price [1] $ 106.75 $ 99.89  
Share-based Compensation Arrangement by Share-based Payment Award, Ancillary 0    
Share-based Compensation Arrangement by Share-based Payment Award, Ancillary, Average Price $ 0    
Stock Appreciation Rights (SARs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Period Start, Shares 32,066    
Granted, Shares 8,081    
Exercised/earned, Shares 6,843    
Cancelled, Shares 591    
Period End, Shares 32,713 32,066  
Period Start, Average Price [1] $ 99.95    
Granted, Average Price [1] 123.54    
Exercised/Earned, Average Price [1] 84.44    
Cancelled, Average Price [1] 122.76    
Period End, Average Price [1] $ 108.61 $ 99.95  
Share-based Compensation Arrangement by Share-based Payment Award, Ancillary 0    
Share-based Compensation Arrangement by Share-based Payment Award, Ancillary, Average Price $ 0    
Performance Share Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Period Start, Shares 1,806    
Granted, Shares 839    
Exercised/earned, Shares 758    
Cancelled, Shares 69    
Period End, Shares 1,919 1,806  
Period Start, Average Price [2] $ 110.41    
Granted, Average Price [2] 121.22    
Exercised/Earned, Average Price [2] 95.28    
Cancelled, Average Price [2] 118.21    
Period End, Average Price [2] $ 120.04 $ 110.41  
Share-based Compensation Arrangement by Share-based Payment Award, Ancillary 101    
Share-based Compensation Arrangement by Share-based Payment Award, Ancillary, Average Price $ 95.28    
Other Incentive Shares/Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Period Start, Shares 3,047    
Granted, Shares 1,223    
Exercised/earned, Shares 816    
Cancelled, Shares 135    
Period End, Shares 3,319 3,047  
Share-based Compensation Arrangement by Share-based Payment Award, Ancillary 0    
Stock Options/Stock Appreciation Rights SARS [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity Awards Vested and Expected to Vest, Awards 33,769    
Equity Awards Vested and Expected to Vest, Average Price [3] $ 107.58    
Equity Awards Vested and Expected to Vest, Average Intrinsic Value $ 1,424    
Equity Awards Vested and Expected to Vest, Remaining Term 5 years 10 months 24 days    
Equity Awards That Are Exercisable, Awards 19,285    
Equity Awards That Are Exercisable, Average Price [3] $ 96.56    
Equity Awards That Are Exercisable, Aggregate Intrinsic Value $ 1,026    
Equity Awards That Are Exercisable, Remaining Term 4 years    
Performance Share Units/Other Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity Awards Vested and Expected to Vest, Awards 5,514    
Equity Awards Vested and Expected to Vest, Average Price [3] $ 0    
Equity Awards Vested and Expected to Vest, Average Intrinsic Value $ 826    
Equity Awards Vested and Expected to Vest, Remaining Term 2 years 1 month 6 days    
[1] eighted-average grant / exercise price.
[2] ncillary shares earned based on actual performance achieved on the 2016 award.
[3] eighted-average exercise price per share.