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v3.21.1

Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions | Total | Common Stock | Treasury Stock | Additional Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2019 |  | 427 | (145) |  |  |
Beginning balance at Dec. 31, 2019 | $ 4,799 | $ 4 | $ (1,782) | $ 2,253 | $ 4,322 | $ 2
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net loss | (268) |  |  |  |  |
Other comprehensive income | (8) |  |  |  |  | (8)
Vesting of restricted stock units (in shares) |  | 1 |  |  |  |
Vesting of restricted stock units | (6) |  | $ (6) |  |  |
Stock compensation expense | 9 |  |  | 9 |  |
Shares repurchased (in shares) |  |  | 13 |  |  |
Shares repurchased | (160) |  | $ (192) | 32 |  |
Ending balance (in shares) at Mar. 31, 2020 |  | 428 | (158) |  |  |
Ending balance at Mar. 31, 2020 | 4,366 | $ 4 | $ (1,980) | 2,294 | 4,054 | (6)
Beginning balance (in shares) at Dec. 31, 2020 |  | 474 | (158) |  |  |
Beginning balance at Dec. 31, 2020 | 3,951 | $ 5 | $ (1,981) | 2,959 | 2,968 | 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net loss | (247) |  |  |  |  |
Other comprehensive income | 0 |  |  |  |  | 0
Vesting of restricted stock units (in shares) |  | 1 |  |  |  |
Vesting of restricted stock units | (6) |  | $ (6) |  |  |
Stock compensation expense | 8 |  |  | 8 |  |
Warrants issued under federal support programs | 8 |  |  | 8 |  |
Ending balance (in shares) at Mar. 31, 2021 |  | 475 | (158) |  |  |
Ending balance at Mar. 31, 2021 | $ 3,714 | $ 5 | $ (1,987) | $ 2,975 | $ 2,721 | $ 0

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