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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions | Total | Common Stock | Additional Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Loss | Treasury Stock, at Cost | Non-controlling Interests
--- | --- | --- | --- | --- | --- | --- | ---
Balance, shares at Dec. 31, 2019 |  | 133.0 |  |  |  |  |
Balance, value at Dec. 31, 2019 | $ 5,687 | $ 2 | $ 2,722 | $ 8,174 | $ (39) | $ (5,218) | $ 46
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 297 |  |  | 284 |  |  | 13
Other comprehensive income (loss), net of taxes | (16) |  |  |  | (16) |  |
Dividends declared | (151) |  |  | (151) |  |  |
Distributions to noncontrolling interest partners | (9) |  |  |  |  |  | (9)
Issuance of common stock under benefit plans | 13 |  | 6 |  |  | 7 |
Stock-based compensation expense | 31 |  | 31 |  |  |  |
Exercise of stock options, shares |  | 2.0 |  |  |  |  |
Exercise of stock options | 117 |  | 18 |  |  | $ 99 |
Shares to cover employee payroll tax withholdings on stock issued under stock-based compensation plans | (13) |  | (13) |  |  |  |
Purchases of treasury stock, shares |  | (1.0) |  |  |  | (0.7) |
Purchases of treasury stock | (75) |  |  |  |  | $ (75) |
Balance, shares at Jun. 30, 2020 |  | 134.0 |  |  |  |  |
Balance, value at Jun. 30, 2020 | 5,881 | $ 2 | 2,764 | 8,307 | (55) | (5,187) | 50
Balance, Value at Dec. 31, 2019 | 76 |  |  |  |  |  |
Redeemable Non-controlling Interest [Abstract] |  |  |  |  |  |  |
Net income | 2 |  |  |  |  |  |
Distributions to noncontrolling interest partners | (1) |  |  |  |  |  |
Balance, Value at Jun. 30, 2020 | 77 |  |  |  |  |  |
Balance, shares at Mar. 31, 2020 |  | 134.0 |  |  |  |  |
Balance, value at Mar. 31, 2020 | 5,703 | $ 2 | 2,738 | 8,197 | (58) | (5,222) | 46
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 192 |  |  | 185 |  |  | 7
Other comprehensive income (loss), net of taxes | 3 |  |  |  | 3 |  |
Dividends declared | (75) |  |  | (75) |  |  |
Distributions to noncontrolling interest partners | (3) |  |  |  |  |  | (3)
Issuance of common stock under benefit plans | 7 |  | 3 |  |  | 4 |
Stock-based compensation expense | 17 |  | 17 |  |  |  |
Exercise of stock options | 37 |  | 6 |  |  | 31 |
Balance, shares at Jun. 30, 2020 |  | 134.0 |  |  |  |  |
Balance, value at Jun. 30, 2020 | 5,881 | $ 2 | 2,764 | 8,307 | (55) | (5,187) | 50
Balance, Value at Mar. 31, 2020 | 76 |  |  |  |  |  |
Redeemable Non-controlling Interest [Abstract] |  |  |  |  |  |  |
Net income | 1 |  |  |  |  |  |
Balance, Value at Jun. 30, 2020 | 77 |  |  |  |  |  |
Balance, shares at Dec. 31, 2020 |  | 133.0 |  |  |  |  |
Balance, value at Dec. 31, 2020 | 6,809 | $ 2 | 2,841 | 9,303 | (21) | (5,366) | 50
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 1,134 |  |  | 1,100 |  |  | 34
Other comprehensive income (loss), net of taxes | 11 |  |  |  | 11 |  |
Dividends declared | (157) |  |  | (157) |  |  |
Distributions to noncontrolling interest partners | (43) |  |  |  |  |  | (43)
Issuance of common stock under benefit plans | 11 |  | (27) |  |  | 38 |
Stock-based compensation expense | 39 |  | 39 |  |  |  |
Exercise of stock options, shares |  | 1.0 |  |  |  |  |
Exercise of stock options | 68 |  | 12 |  |  | 56 |
Shares to cover employee payroll tax withholdings on stock issued under stock-based compensation plans | (22) |  | (10) |  |  | $ (12) |
Purchases of treasury stock, shares |  | (12.0) |  |  |  | (12.5) |
Purchases of treasury stock | (1,910) |  | (300) |  |  | $ (1,610) |
Balance, shares at Jun. 30, 2021 |  | 122.0 |  |  |  |  |
Balance, value at Jun. 30, 2021 | 5,940 | $ 2 | 2,555 | 10,246 | (10) | (6,894) | 41
Balance, Value at Dec. 31, 2020 | 82 |  |  |  |  |  |
Redeemable Non-controlling Interest [Abstract] |  |  |  |  |  |  |
Net income | 6 |  |  |  |  |  |
Distributions to noncontrolling interest partners | (10) |  |  |  |  |  |
Balance, Value at Jun. 30, 2021 | 78 |  |  |  |  |  |
Balance, shares at Mar. 31, 2021 |  | 131.0 |  |  |  |  |
Balance, value at Mar. 31, 2021 | 6,790 | $ 2 | 2,824 | 9,690 | (31) | (5,740) | 45
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 648 |  |  | 631 |  |  | 17
Other comprehensive income (loss), net of taxes | 21 |  |  |  | 21 |  |
Dividends declared | (75) |  |  | (75) |  |  |
Distributions to noncontrolling interest partners | (21) |  |  |  |  |  | (21)
Issuance of common stock under benefit plans | 6 |  | 2 |  |  | 4 |
Stock-based compensation expense | 21 |  | 21 |  |  |  |
Exercise of stock options | 51 |  | 9 |  |  | 42 |
Shares to cover employee payroll tax withholdings on stock issued under stock-based compensation plans | (1) |  | (1) |  |  |  |
Purchases of treasury stock, shares |  | (9.0) |  |  |  |  |
Purchases of treasury stock | (1,500) |  | (300) |  |  | (1,200) |
Balance, shares at Jun. 30, 2021 |  | 122.0 |  |  |  |  |
Balance, value at Jun. 30, 2021 | 5,940 | $ 2 | $ 2,555 | $ 10,246 | $ (10) | $ (6,894) | $ 41
Balance, Value at Mar. 31, 2021 | 79 |  |  |  |  |  |
Redeemable Non-controlling Interest [Abstract] |  |  |  |  |  |  |
Net income | 2 |  |  |  |  |  |
Distributions to noncontrolling interest partners | (3) |  |  |  |  |  |
Balance, Value at Jun. 30, 2021 | $ 78 |  |  |  |  |  |

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