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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, 2014 | $ 4,330 | $ 2 | $ 2,418 | $ 5,723 | $ (27) | $ (3,815) | $ 29
Balance, shares at Dec. 31, 2014 |  | 144.0 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 751 |  |  | 709 |  |  | 42
Other comprehensive income (loss), net of tax | (11) |  |  |  | (11) |  |
Dividends declared | (219) |  |  | (219) |  |  |
Distributions to noncontrolling interests | (42) |  |  |  |  |  | (42)
Issuance of common stock under benefit plans, value | 21 |  | 6 |  |  | 15 |
Issuance of common stock under benefit plans, shares |  | 1.0 |  |  |  |  |
Stock-based compensation expense | 52 |  | 48 |  |  | 4 |
Exercise of stock options, value | 60 |  |  |  |  | 60 |
Exercise of stock options, shares |  | 1.0 |  |  |  |  |
Tax benefits associated with stock-based compensation plans | 5 |  | 5 |  |  |  |
Shares to cover employee payroll tax withholdings on stock issued under stock-based compensation plans, value | (7) |  | (7) |  |  |  |
Purchases of treasury stock, value | (224) |  |  |  |  | $ (224) |
Purchases of treasury stock, shares |  | (3.0) |  |  |  | (3.2) |
Sale of redeemable noncontrolling interest | 11 |  | 11 |  |  |  |
Adjustment to fair value | (14) |  |  | (14) |  |  |
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 |  |  |  |  |
Balance, value at Dec. 31, 2014 | 0 |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 2 |  |  |  |  |  |
Sale of redeemable noncontrolling interest | 54 |  |  |  |  |  |
Adjustment to fair value | 14 |  |  |  |  |  |
Balance, value at Dec. 31, 2015 | 70 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 689 |  |  | 645 |  |  | 44
Other comprehensive income (loss), net of tax | (34) |  |  |  | (34) |  |
Dividends declared | (231) |  |  | (231) |  |  |
Distributions to noncontrolling interests | (41) |  |  |  |  |  | (41)
Issuance of common stock under benefit plans, value | 22 |  | 7 |  |  | 15 |
Stock-based compensation expense | 69 |  | 65 |  |  | 4 |
Exercise of stock options, value | 73 |  | 2 |  |  | 71 |
Exercise of stock options, shares |  | 1.0 |  |  |  |  |
Shares to cover employee payroll tax withholdings on stock issued under stock-based compensation plans, value | (10) |  | (10) |  |  |  |
Purchases of treasury stock, value | (590) |  |  |  |  | $ (590) |
Purchases of treasury stock, shares |  | (7.0) |  |  |  | (7.4) |
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 Temporary Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 7 |  |  |  |  |  |
Balance, value at Dec. 31, 2016 | 77 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 817 |  |  | 772 |  |  | 45
Other comprehensive income (loss), net of tax | 24 |  |  |  | 24 |  |
Dividends declared | (247) |  |  | (247) |  |  |
Distributions to noncontrolling interests | (47) |  |  |  |  |  | (47)
Issuance of common stock under benefit plans, value | 23 |  | 11 |  |  | 12 |
Stock-based compensation expense | 79 |  | 75 |  |  | 4 |
Exercise of stock options, value | 130 |  | 4 |  |  | 126 |
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 | (465) |  |  |  |  | $ (465) |
Purchases of treasury stock, shares |  | (5.0) |  |  |  | (4.6) |
Sale of redeemable noncontrolling interest | 4 |  |  |  |  |  | 4
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 Temporary Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 7 |  |  |  |  |  |
Distributions to noncontrolling interests | (4) |  |  |  |  |  |
Balance, value at Dec. 31, 2017 | $ 80 |  |  |  |  |  |

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