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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, 2015 | $ 4,713 | $ 2 | $ 2,481 | $ 6,199 | $ (38) | $ (3,960) | $ 29
Balance, shares at Dec. 31, 2015 |  | 143.0 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 523 |  |  | 490 |  |  | 33
Other comprehensive income (loss), net of taxes | (23) |  |  |  | (23) |  |
Dividends declared | (169) |  |  | (169) |  |  |
Distributions to noncontrolling interests | (31) |  |  |  |  |  | (31)
Issuance of common stock under benefit plans, value | 16 |  | 5 |  |  | 11 |
Issuance of common stock under benefit plans, shares |  | 1.0 |  |  |  |  |
Stock-based compensation expense | 52 |  | 49 |  |  | 3 |
Exercise of stock options, value | 63 |  | 1 |  |  | 62 |
Exercise of stock options, shares |  | 1.0 |  |  |  |  |
Shares to cover employee payroll tax withholdings on stock issued under stock-based compensation plans | (10) |  | (10) |  |  |  |
Purchases of treasury stock, value | (440) |  | 0 |  |  | $ (440) |
Purchases of treasury stock, shares |  | (6.0) |  |  |  | (5.7) |
Balance, value at Sep. 30, 2016 | 4,694 | $ 2 | 2,526 | 6,520 | (61) | $ (4,324) | 31
Balance, shares at Sep. 30, 2016 |  | 139.0 |  |  |  |  |
Balance, Value at Dec. 31, 2015 | 70 |  |  |  |  |  |
Redeemable Non-controlling Interest [Abstract] |  |  |  |  |  |  |
Net income | 6 |  |  |  |  |  |
Balance, Value at Sep. 30, 2016 | 76 |  |  |  |  |  |
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 income (loss), net of taxes | 24 |  |  |  | 24 |  |
Dividends declared | (185) |  |  | (185) |  |  |
Distributions to noncontrolling interests | (34) |  |  |  |  |  | (34)
Issuance of common stock under benefit plans, value | 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 | (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 |  |  |  |  |  |

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