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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, 2016 | $ 4,660 | $ 2 | $ 2,545 | $ 6,613 | $ (72) | $ (4,460) | $ 32
Balance, shares at Dec. 31, 2016 |  | 137.0 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 552 |  |  | 518 |  |  | 34
Other comprehensive loss, net of taxes | 24 |  |  |  | 24 |  |
Dividends declared | (185) |  |  | (185) |  |  |
Distributions to noncontrolling interests | (34) |  |  |  |  |  | (34)
Issuance of common stock under benefit plans | 18 |  | 9 |  |  | 9 |
Stock-based compensation expense | 54 |  | 51 |  |  | 3 |
Exercise of stock options, value | 125 |  | 3 |  |  | 122 |
Exercise of stock options, shares |  | 3.0 |  |  |  |  |
Shares to cover employee payroll tax withholdings on stock issued under stock-based compensation plans, value | (23) |  | (23) |  |  |  |
Purchases of treasury stock, value | (365) |  |  |  |  | $ (365) |
Purchases of treasury stock, shares |  | (4.0) |  |  |  | (3.6) |
Other | 2 |  |  |  |  |  | 2
Balance, value at Sep. 30, 2017 | 4,828 | $ 2 | 2,585 | 6,946 | (48) | $ (4,691) | 34
Balance, shares at Sep. 30, 2017 |  | 136.0 |  |  |  |  |
Balance, Value at Dec. 31, 2016 | 77 |  |  |  |  |  |
Redeemable Non-controlling Interest [Abstract] |  |  |  |  |  |  |
Net income | 5 |  |  |  |  |  |
Distributions to noncontrolling interests | (4) |  |  |  |  |  |
Balance, Value at Sep. 30, 2017 | 78 |  |  |  |  |  |
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 | 643 |  |  | 609 |  |  | 34
Other comprehensive loss, net of taxes | (8) |  |  |  | (8) |  |
Dividends declared | (203) |  |  | (203) |  |  |
Distributions to noncontrolling interests | (32) |  |  |  |  |  | (32)
Issuance of common stock under benefit plans | 20 |  | 10 |  |  | 10 |
Stock-based compensation expense | 53 |  | 49 |  |  | 4 |
Exercise of stock options, value | 95 |  | 5 |  |  | 90 |
Exercise of stock options, shares |  | 2.0 |  |  |  |  |
Shares to cover employee payroll tax withholdings on stock issued under stock-based compensation plans, value | (20) |  | (20) |  |  |  |
Purchases of treasury stock, value | (150) |  |  |  |  | $ (150) |
Purchases of treasury stock, shares |  | (1.0) |  |  |  | (1.4) |
Sale of noncontrolling interest in subsidiaries | 12 |  |  |  |  |  | 12
Reclassification of stranded tax effects resulting from enactment of the Tax Cuts and Jobs Act | 0 |  |  | 2 | (2) |  |
Balance, value at Sep. 30, 2018 | 5,365 | $ 2 | $ 2,656 | $ 7,546 | $ (58) | $ (4,829) | $ 48
Balance, shares at Sep. 30, 2018 |  | 136.0 |  |  |  |  |
Balance, Value at Dec. 31, 2017 | 80 |  |  |  |  |  |
Redeemable Non-controlling Interest [Abstract] |  |  |  |  |  |  |
Net income | 6 |  |  |  |  |  |
Distributions to noncontrolling interests | (9) |  |  |  |  |  |
Balance, Value at Sep. 30, 2018 | $ 77 |  |  |  |  |  |

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