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Employee Benefits - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Expense $ 649 $ 380 $ 382
Stock Issued During Period, Value, Employee Stock Purchase Plan 83 84 86
Deferred Compensation Arrangement with Individual, Compensation Expense 74 69 47
Fair Value of Deferred Compensation Plan, Liabilities $ 116 84  
2004 Equity Incentive Plan [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    
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 243    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 98    
Share Based Compensation Expense [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Other Inventory, Capitalized Costs, Gross $ 11 9 8
Inventories [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount $ 17 15 13
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 $ 337 $ 452 $ 1,100
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 38.78 $ 20.04 $ 29.73
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 413    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 5 months 15 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 $ 31    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 3 months 25 days    
Granted $ 74.42 $ 71.60 $ 61.71
Total grant date fair value of stock awards vested $ 4 $ 33 $ 76
Total fair value of vested stock awards as of vesting date 3 45 160
Share-based Compensation Expense $ 24 $ 20 $ 40
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%    
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value of RSUs granted $ 73.56    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 810    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 7 months 20 days    
Granted $ 69.57 $ 84.51 $ 103.19
Total grant date fair value of stock awards vested $ 325 $ 284 $ 249
Total fair value of vested stock awards as of vesting date $ 285 $ 408 $ 666
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 12    
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent 85.00%    
Issuances under employee stock purchase plan, Shares 1    
Stock Issued During Period, Value, Employee Stock Purchase Plan $ 83    
Common Stock, Capital Shares Reserved for Future Issuance 79