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UNAUDITED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Millions | Total | Cumulative Effect of Adoption of Accounting Standards Update | Common Stock | Treasury Stock | Additional Paid-in Capital | Additional Paid-in Capital Cumulative Effect of Adoption of Accounting Standards Update | Retained Earnings | Retained Earnings Cumulative Effect of Adoption of Accounting Standards Update | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2020 |  |  | 63,406 | (22,447) |  |  |  |  |
Balance at Dec. 31, 2020 | $ 4,893 |  | $ 0 | $ (24,128) | $ 5,851 |  | $ 23,288 |  | $ (118)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Net income (loss) | (222) |  |  |  |  |  | (222) |  |
Foreign currency translation adjustments | (22) |  |  |  |  |  |  |  | (22)
Losses on cash flow hedges | 0 |  |  |  |  |  |  |  |
Net unrealized gains on available-for-sale securities, net of tax | 97 |  |  |  |  |  |  |  | 97
Exercise of stock options and vesting of restricted stock units and performance share units (in shares) |  |  | 169 |  |  |  |  |  |
Exercise of stock options and vesting of restricted stock units and performance share units | $ 4 |  | $ 0 |  | 4 |  |  |  |
Repurchase of common stock (in shares) | (68) |  |  | (68) |  |  |  |  |
Repurchase of common stock | $ (155) |  |  | $ (155) |  |  |  |  |
Stock-based compensation and other stock-based payments | 209 |  |  |  | 209 |  |  |  |
Reclassification adjustment for convertible debt in mezzanine | (5) |  |  |  | (5) |  |  |  |
Balance (in shares) at Jun. 30, 2021 |  |  | 63,575 | (22,515) |  |  |  |  |
Balance at Jun. 30, 2021 | 4,799 |  | $ 0 | $ (24,283) | 6,059 |  | 23,066 |  | (43)
Balance (in shares) at Mar. 31, 2021 |  |  | 63,562 | (22,511) |  |  |  |  |
Balance at Mar. 31, 2021 | 4,764 |  | $ 0 | $ (24,274) | 5,965 |  | 23,233 |  | (160)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Net income (loss) | (167) |  |  |  |  |  | (167) |  |
Foreign currency translation adjustments | 8 |  |  |  |  |  |  |  | 8
Losses on cash flow hedges | 11 |  |  |  |  |  |  |  | 11
Net unrealized gains on available-for-sale securities, net of tax | 98 |  |  |  |  |  |  |  | 98
Exercise of stock options and vesting of restricted stock units and performance share units (in shares) |  |  | 13 |  |  |  |  |  |
Exercise of stock options and vesting of restricted stock units and performance share units | $ 3 |  | $ 0 |  | 3 |  |  |  |
Repurchase of common stock (in shares) | (4) |  |  | (4) |  |  |  |  |
Repurchase of common stock | $ (9) |  |  | $ (9) |  |  |  |  |
Stock-based compensation and other stock-based payments | 96 |  |  |  | 96 |  |  |  |
Reclassification adjustment for convertible debt in mezzanine | (5) |  |  |  | (5) |  |  |  |
Balance (in shares) at Jun. 30, 2021 |  |  | 63,575 | (22,515) |  |  |  |  |
Balance at Jun. 30, 2021 | 4,799 |  | $ 0 | $ (24,283) | 6,059 |  | 23,066 |  | (43)
Balance (in shares) at Dec. 31, 2021 |  |  | 63,584 | (22,518) |  |  |  |  |
Balance at Dec. 31, 2021 | 6,178 | $ (66) | $ 0 | $ (24,290) | 6,159 | $ (96) | 24,453 | $ 30 | (144)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Net income (loss) | 157 |  |  |  |  |  | 157 |  |
Foreign currency translation adjustments | (108) |  |  |  |  |  |  |  | (108)
Losses on cash flow hedges | 0 |  |  |  |  |  |  |  |
Net unrealized gains on available-for-sale securities, net of tax | 0 |  |  |  |  |  |  |  |
Exercise of stock options and vesting of restricted stock units and performance share units (in shares) |  |  | 182 |  |  |  |  |  |
Exercise of stock options and vesting of restricted stock units and performance share units | $ 5 |  | $ 0 |  | 5 |  |  |  |
Repurchase of common stock (in shares) | (1,100) |  |  | (1,100) |  |  |  |  |
Repurchase of common stock | $ (2,374) |  |  | $ (2,374) |  |  |  |  |
Stock-based compensation and other stock-based payments | 210 |  |  |  | 210 |  |  |  |
Balance (in shares) at Jun. 30, 2022 |  |  | 63,766 | (23,618) |  |  |  |  |
Balance at Jun. 30, 2022 | 4,002 |  | $ 0 | $ (26,664) | 6,278 |  | 24,640 |  | (252)
Balance (in shares) at Mar. 31, 2022 |  |  | 63,759 | (23,005) |  |  |  |  |
Balance at Mar. 31, 2022 | 4,373 |  | $ 0 | $ (25,390) | 6,163 |  | 23,783 |  | (183)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Net income (loss) | 857 |  |  |  |  |  | 857 |  |
Foreign currency translation adjustments | (70) |  |  |  |  |  |  |  | (70)
Losses on cash flow hedges | 0 |  |  |  |  |  |  |  |
Net unrealized gains on available-for-sale securities, net of tax | 1 |  |  |  |  |  |  |  | 1
Exercise of stock options and vesting of restricted stock units and performance share units (in shares) |  |  | 7 |  |  |  |  |  |
Exercise of stock options and vesting of restricted stock units and performance share units | $ 2 |  | $ 0 |  | 2 |  |  |  |
Repurchase of common stock (in shares) | (613) |  |  | (613) |  |  |  |  |
Repurchase of common stock | $ (1,274) |  |  | $ (1,274) |  |  |  |  |
Stock-based compensation and other stock-based payments | 113 |  |  |  | 113 |  |  |  |
Balance (in shares) at Jun. 30, 2022 |  |  | 63,766 | (23,618) |  |  |  |  |
Balance at Jun. 30, 2022 | $ 4,002 |  | $ 0 | $ (26,664) | $ 6,278 |  | $ 24,640 |  | $ (252)

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