XML 120 R107.htm IDEA: XBRL DOCUMENT v3.8.0.1
Earnings Per Share (Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share) (Details) - shares
shares in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Securities excluded from computation of earnings per share (in shares) 2  
Anti-dilutive share based awards    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Securities excluded from computation of earnings per share (in shares) 16 9
PRSUs    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Securities excluded from computation of earnings per share (in shares) 2 1