XML 34 R8.htm IDEA: XBRL DOCUMENT v3.10.0.1
Consolidated Statement of Equity (Parenthetical) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]      
Common stock dividends per share (in dollars per share) $ 2.86 $ 2.76 $ 2.68