XML 70 R57.htm IDEA: XBRL DOCUMENT v3.8.0.1
Stockbased Compensation Expense (Details) - USD ($)
$ 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]      
Stock Option Awards $ 53 $ 41 $ 44
Restricted Unit Awards 106 92 81
Stock-based Compensation Expense 159 133 125
Excess tax benefits from stock-based compensation recorded as a reduction of the income tax provision 65    
Excess income tax benefits from stock-based compensation plans recognized in equity   $ 53 $ 63
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized Compensation Costs On Nonvested Awards $ 99    
Unrecognized Compensation Costs On Nonvested Awards, Weighted Average Period Of Recognition 2 years 7 months    
Employee Stock Option [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized Compensation Costs on Nonvested Awards, Period of Recognition 4 years    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized Compensation Costs On Nonvested Awards $ 147    
Unrecognized Compensation Costs On Nonvested Awards, Weighted Average Period Of Recognition 2 years    
Restricted Stock Units (RSUs) [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized Compensation Costs on Nonvested Awards, Period of Recognition 4 years