XML 169 R143.htm IDEA: XBRL DOCUMENT v3.10.0.1
Stock-Based Compensation - Stock Option Exercises, Acquisitions (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award      
Treasury stock, Shares (in shares) 1,307,249,588   1,340,947,648
Additional stock options outstanding in connection with acquisitions (in shares)     200,000
Additional options outstanding, weighted-average exercise price (in dollars per share)     $ 39
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award      
Total intrinsic value of options exercised $ 7 $ 20  
Cash received from employees as a result of employee stock option exercises 11 33  
Tax benefit from exercise of stock based awards $ 2 $ 7