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Employee Benefits - Restricted Stock Units (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Document Fiscal Year Focus 2018    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value of RSUs granted $ 77.98    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 789    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 4 months 24 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding at December 31, 2017 15,005    
Granted 7,196    
Vested (5,619)    
Forfeited (1,688)    
Outstanding at December 31, 2018 14,894 15,005  
Share-based Compensation Arrangement by Share-based Payment Award, Weighted Average Grant-Date Fair Value Per Share      
Outstanding at December 31, 2017 $ 79.37    
Granted 77.98 $ 73.56 $ 84.51
Vested 82.22    
Forfeited 78.48    
Outstanding at December 31, 2018 $ 77.72 $ 79.37  
Total grant date fair value of stock awards vested $ 462 $ 325 $ 284
Total fair value of vested stock awards as of vesting date $ 428 $ 285 $ 408
Minimum [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Maximum [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years