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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

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