XML 190 R131.htm IDEA: XBRL DOCUMENT v3.20.4
Equity-based compensation - Summary of non-vested share movements (Details)
$ / shares in Units, shares in Thousands, $ in Millions
 9 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
shares
$ / shares
Dec. 31, 2020
USD ($)
shares
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Non-vested shares at January 1 (in shares) | shares 4,222 4,742
Vested (in shares) | shares (108) (1,149)
Forfeited (in shares) | shares (114) (301)
Non-invested shares at December 31 (in shares) | shares 4,742 5,417
Outstanding, beginning balance, weighted average fair value at grant date (in dollars per share) | $ / shares   $ 51.20
Outstanding, ending balance, weighted average fair value at grant date (in dollars per share) | $ / shares $ 51.20 $ 54.90
Fair value, beginning balance, non-vested | $ $ 212 $ 243
Fair value, vested | $ (5) (58)
Fair value, forfeited | $ (6) (16)
Fair value, ending balance, non-vested | $ $ 243 $ 297
Restricted awards [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Granted (in shares) | shares 625 1,668
Granted, weighted average fair value at grant date (in dollars per share) | $ / shares $ 56.10 $ 60.19
Fair value, granted | $ $ 35 $ 100
Performance awards [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Granted (in shares) | shares 117 457
Granted, weighted average fair value at grant date (in dollars per share) | $ / shares $ 58.00 $ 62.03
Fair value, granted | $ $ 7 $ 28