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Equity - Treasury stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 05, 2019 | Nov. 05, 2018 | Mar. 31, 2019 | Feb. 05, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Oct. 22, 2018
Treasury stock: |  |  |  |  |  |  |  |
Purchase/acquisition of treasury stock (in shares) |  |  |  |  | 0 |  |  |
Additional Paid-in Capital |  |  |  |  |  |  |  |
Treasury stock: |  |  |  |  |  |  |  |
Repurchases of common stock (in dollars) |  |  | $ (32) |  |  | $ (32) | $ 33 |
Treasury Stock |  |  |  |  |  |  |  |
Treasury stock: |  |  |  |  |  |  |  |
Purchase/acquisition of treasury stock (in shares) |  |  |  |  |  |  | 5,847 |
Repurchases of common stock (in dollars) |  |  | $ (31) |  |  | $ (31) | $ 624 |
ASR agreement |  |  |  |  |  |  |  |
Treasury stock: |  |  |  |  |  |  |  |
Payment made for repurchase of shares |  | $ 455 |  |  |  |  |  |
Purchase/acquisition of treasury stock (in shares) | 4,000 | 4,000 |  |  |  |  |  |
Repurchases of common stock (in dollars) |  | $ 423 |  | $ 392 |  |  |  |
VWAP (in dollars per share) | $ 98.04 |  |  | $ 98.04 |  |  |  |
Amount of cash returned from upfront payment in repurchase of stock | $ 63 |  |  |  |  |  |  |
2018 Stock Repurchase Program |  |  |  |  |  |  |  |
Treasury stock: |  |  |  |  |  |  |  |
Shares authorized to be repurchased (in shares) |  |  |  |  |  |  |  | 8,000

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