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Employee Benefits - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions, $ 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]      
Share-based Compensation Expense $ 845 $ 649 $ 380
Stock Issued During Period, Value, Employee Stock Purchase Plan 91 83 84
Deferred Compensation Arrangement with Individual, Compensation Expense 91 74 69
Fair Value of Deferred Compensation Plan, Liabilities $ 124 116  
2004 Equity Incentive Plan [Member] | Common Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 309    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 91    
Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 412 $ 337 $ 452
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 17.03 $ 38.78 $ 20.04
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 173    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 4 months 24 days    
Stock Option | Prior to 2011 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years    
Stock Option | Starting in 2011 [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    
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 33    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 1 month 6 days    
Granted $ 88.76 $ 74.42 $ 71.60
Total grant date fair value of stock awards vested $ 19 $ 4 $ 33
Total fair value of vested stock awards as of vesting date 18 3 45
Share-based Compensation Expense $ 31 $ 24 $ 20
Performance Shares | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Other than Options, Pay-out Percentage 0.00%    
Performance Shares | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Other than Options, Pay-out Percentage 200.00%    
Employee Stock Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 10    
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent 85.00%    
Issuances under employee stock purchase plan, Shares 2    
Stock Issued During Period, Value, Employee Stock Purchase Plan $ 91    
Common Stock, Capital Shares Reserved for Future Issuance 79