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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 | Retained Earnings | Retained Earnings Cumulative Effect of Adoption of Accounting Standards Update | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2019 |  |  | 63,179 | (21,762) |  |  |  |
Balance at Dec. 31, 2019 | $ 5,933 | $ (3) | $ 0 | $ (22,864) | $ 5,756 | $ 23,232 | $ (3) | $ (191)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Net income | 224 |  |  |  |  | 224 |  |
Foreign currency translation adjustments, net of tax | (3) |  |  |  |  |  |  | (3)
Net unrealized gains on available-for-sale securities, net of tax | (2) |  |  |  |  |  |  | (2)
Issuance of convertible senior notes | 96 |  |  |  | 96 |  |  |
Conversion of debt | (245) |  |  |  | (245) |  |  |
Exercise of stock options and vesting of restricted stock units and performance share units (in shares) |  |  | 220 |  |  |  |  |
Exercise of stock options and vesting of restricted stock units and performance share units | $ 6 |  | $ 0 |  | 6 |  |  |
Repurchase of common stock (in shares) | (682) |  |  | (682) |  |  |  |
Repurchase of common stock | $ (1,259) |  |  | $ (1,259) |  |  |  |
Stock-based compensation and other stock-based payments | 166 |  |  |  | 166 |  |  |
Balance (in shares) at Sep. 30, 2020 |  |  | 63,399 | (22,444) |  |  |  |
Balance at Sep. 30, 2020 | 4,913 |  | $ 0 | $ (24,123) | 5,779 | 23,453 |  | (196)
Balance (in shares) at Jun. 30, 2020 |  |  | 63,391 | (22,442) |  |  |  |
Balance at Jun. 30, 2020 | 3,999 |  | $ 0 | $ (24,119) | 5,699 | 22,652 |  | (233)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Net income | 801 |  |  |  |  | 801 |  |
Foreign currency translation adjustments, net of tax | 42 |  |  |  |  |  |  | 42
Net unrealized gains on available-for-sale securities, net of tax | (5) |  |  |  |  |  |  | (5)
Exercise of stock options and vesting of restricted stock units and performance share units (in shares) |  |  | 8 |  |  |  |  |
Exercise of stock options and vesting of restricted stock units and performance share units | $ 0 |  | $ 0 |  | 0 |  |  |
Repurchase of common stock (in shares) | (2) |  |  | (2) |  |  |  |
Repurchase of common stock | $ (4) |  |  | $ (4) |  |  |  |
Stock-based compensation and other stock-based payments | 80 |  |  |  | 80 |  |  |
Balance (in shares) at Sep. 30, 2020 |  |  | 63,399 | (22,444) |  |  |  |
Balance at Sep. 30, 2020 | 4,913 |  | $ 0 | $ (24,123) | 5,779 | 23,453 |  | (196)
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 | 547 |  |  |  |  | 547 |  |
Foreign currency translation adjustments, net of tax | (52) |  |  |  |  |  |  | (52)
Net unrealized gains on available-for-sale securities, net of tax | 98 |  |  |  |  |  |  | 98
Conversion of debt | (86) |  |  |  | (86) |  |  |
Exercise of stock options and vesting of restricted stock units and performance share units (in shares) |  |  | 174 |  |  |  |  |
Exercise of stock options and vesting of restricted stock units and performance share units | $ 4 |  | $ 0 |  | 4 |  |  |
Repurchase of common stock (in shares) | (70) |  |  | (70) |  |  |  |
Repurchase of common stock | $ (158) |  |  | $ (158) |  |  |  |
Stock-based compensation and other stock-based payments | 299 |  |  |  | 299 |  |  |
Balance (in shares) at Sep. 30, 2021 |  |  | 63,580 | (22,517) |  |  |  |
Balance at Sep. 30, 2021 | 5,545 |  | $ 0 | $ (24,286) | 6,068 | 23,835 |  | (72)
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)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Net income | 769 |  |  |  |  | 769 |  |
Foreign currency translation adjustments, net of tax | (30) |  |  |  |  |  |  | (30)
Net unrealized gains on available-for-sale securities, net of tax | 1 |  |  |  |  |  |  | 1
Conversion of debt | (81) |  |  |  | (81) |  |  |
Exercise of stock options and vesting of restricted stock units and performance share units (in shares) |  |  | 5 |  |  |  |  |
Exercise of stock options and vesting of restricted stock units and performance share units | $ 0 |  | $ 0 |  | 0 |  |  |
Repurchase of common stock (in shares) | (2) |  |  | (2) |  |  |  |
Repurchase of common stock | $ (3) |  |  | $ (3) |  |  |  |
Stock-based compensation and other stock-based payments | 90 |  |  |  | 90 |  |  |
Balance (in shares) at Sep. 30, 2021 |  |  | 63,580 | (22,517) |  |  |  |
Balance at Sep. 30, 2021 | $ 5,545 |  | $ 0 | $ (24,286) | $ 6,068 | $ 23,835 |  | $ (72)

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