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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, value at Dec. 31, 2017 | $ 4,955 | $ 2 | $ 2,612 | $ 7,138 | $ (48) | $ (4,783) | $ 34
Balance, shares at Dec. 31, 2017 |  | 135.0 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 781 |  |  | 736 |  |  | 45
Other comprehensive income (loss), net of tax | (9) |  |  |  | (9) |  |
Dividends declared | (274) |  |  | (274) |  |  |
Distributions to noncontrolling interest partners | (44) |  |  |  |  |  | (44)
Issuance of common stock under benefit plans | 28 |  | 14 |  |  | 14 |
Stock-based compensation expense | 61 |  | 56 |  |  | 5 |
Exercise of stock options, value | 99 |  | 6 |  |  | 93 |
Exercise of stock options, shares |  | 3.0 |  |  |  |  |
Shares to cover employee payroll tax withholdings on stock issued under stock-based compensation plans | (21) |  | (21) |  |  |  |
Purchases of treasury stock, value | (325) |  |  |  |  | $ (325) |
Purchases of treasury stock, shares |  | (3.0) |  |  |  | (3.4) |
Contributions from noncontrolling interest partners | 16 |  |  |  |  |  | 16
Reclassification of stranded tax effects resulting from enactment of the Tax Cuts and Jobs Act | 0 |  |  | 2 | (2) |  |
Balance, value at Dec. 31, 2018 | 5,267 | $ 2 | 2,667 | 7,602 | (59) | $ (4,996) | 51
Balance, shares at Dec. 31, 2018 |  | 135.0 |  |  |  |  |
Balance, value at Dec. 31, 2017 | 80 |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 7 |  |  |  |  |  |
Distributions to noncontrolling interest partners | (10) |  |  |  |  |  |
Balance, value at Dec. 31, 2018 | 77 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 900 |  |  | 858 |  |  | 42
Other comprehensive income (loss), net of tax | 20 |  |  |  | 20 |  |
Dividends declared | (286) |  |  | (286) |  |  |
Distributions to noncontrolling interest partners | (47) |  |  |  |  |  | (47)
Issuance of common stock under benefit plans | 24 |  | 9 |  |  | 15 |
Stock-based compensation expense | 56 |  | 55 |  |  | 1 |
Exercise of stock options, value | 119 |  | 7 |  |  | 112 |
Exercise of stock options, shares |  | 2.0 |  |  |  |  |
Shares to cover employee payroll tax withholdings on stock issued under stock-based compensation plans | (16) |  | (16) |  |  |  |
Purchases of treasury stock, value | (350) |  |  |  |  | $ (350) |
Purchases of treasury stock, shares |  | (4.0) |  |  |  | (3.5) |
Balance, value at Dec. 31, 2019 | 5,687 | $ 2 | 2,722 | 8,174 | (39) | $ (5,218) | 46
Balance, shares at Dec. 31, 2019 |  | 133.0 |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 6 |  |  |  |  |  |
Distributions to noncontrolling interest partners | (7) |  |  |  |  |  |
Balance, value at Dec. 31, 2019 | 76 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 1,484 |  |  | 1,431 |  |  | 53
Other comprehensive income (loss), net of tax | 18 |  |  |  | 18 |  |
Dividends declared | (302) |  |  | (302) |  |  |
Distributions to noncontrolling interest partners | (49) |  |  |  |  |  | (49)
Issuance of common stock under benefit plans | 25 |  | 11 |  |  | 14 |
Issuance of common stock under benefit plans, sharers |  | 1.0 |  |  |  |  |
Stock-based compensation expense | 97 |  | 97 |  |  |  |
Exercise of stock options, value | 189 |  | 26 |  |  | 163 |
Exercise of stock options, shares |  | 2.0 |  |  |  |  |
Shares to cover employee payroll tax withholdings on stock issued under stock-based compensation plans | (15) |  | (15) |  |  |  |
Purchases of treasury stock, value | (325) |  |  |  |  | $ (325) |
Purchases of treasury stock, shares |  | (3.0) |  |  |  | (2.7) |
Balance, value at Dec. 31, 2020 | 6,809 | $ 2 | $ 2,841 | $ 9,303 | $ (21) | $ (5,366) | $ 50
Balance, shares at Dec. 31, 2020 |  | 133.0 |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 15 |  |  |  |  |  |
Distributions to noncontrolling interest partners | (9) |  |  |  |  |  |
Balance, value at Dec. 31, 2020 | $ 82 |  |  |  |  |  |

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