XML 99 R88.htm IDEA: XBRL DOCUMENT v3.21.1
Earnings Per Share (Narrative) (Details) - shares
shares in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share [Abstract]    
Undistributed earnings allocated to participating unvested share-based payment awards, weighted outstanding shares 6.0 5.1