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Employee Benefits - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Expense $ 380 $ 382 $ 360
Stock Issued During Period, Value, Employee Stock Purchase Plan 84 86 72
Deferred Compensation Arrangement with Individual, Compensation Expense 69 47 40
Fair Value of Deferred Compensation Plan, Liabilities $ 84 66  
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 60    
Share Based Compensation Expense [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Other Inventory, Capitalized Costs, Gross $ 9 8 6
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 $ 15 13 12
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 $ 452 $ 1,100 $ 1,200
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 20.04 $ 29.73 $ 27.63
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 72    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 10 months 6 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 $ 19    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 3 months 19 days    
Granted $ 71.60 $ 61.71 $ 56.38
Total grant date fair value of stock awards vested $ 33 $ 76 $ 46
Total fair value of vested stock awards as of vesting date 45 160 145
Share-based Compensation Expense $ 20 $ 40 $ 57
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]      
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 $ 577    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 4 months 26 days    
Granted $ 84.51 $ 103.19 $ 86.75
Total grant date fair value of stock awards vested $ 284 $ 249 $ 182
Total fair value of vested stock awards as of vesting date $ 408 $ 666 $ 535
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 13    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 5    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 month 5 days    
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 $ 84    
Common Stock, Capital Shares Reserved for Future Issuance 79