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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, 2013 | $ 3,973 | $ 2 | $ 2,379 | $ 5,358 | $ (8) | $ (3,783) | $ 25
Balance, shares at Dec. 31, 2013 |  | 144 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 392 |  |  | 366 |  |  | 26
Other comprehensive loss, net of taxes | (7) |  |  |  | (7) |  |
Dividends declared | (143) |  |  | (143) |  |  |
Distributions to noncontrolling interests | (23) |  |  |  |  |  | (23)
Issuance of common stock under benefit plans, value | 14 |  | 1 |  |  | 13 |
Issuance of common stock under benefit plans, shares |  | 1 |  |  |  |  |
Stock-based compensation expense | 38 |  | 36 |  |  | 2 |
Exercise of stock options, value | 55 |  | (3) |  |  | 58 |
Exercise of stock options, shares |  | 1 |  |  |  |  |
Shares to cover employee payroll tax withholdings on stock issued under benefit plans, value | (6) |  | (6) |  |  |  |
Tax benefits associated with stock-based compensation plans | (1) |  | $ (1) |  |  |  |
Purchases of treasury stock, value | (82) |  |  |  |  | (82) |
Purchases of treasury stock, shares |  | (1) |  |  |  |  |
Balance, value at Sep. 30, 2014 | 4,210 | $ 2 | $ 2,406 | 5,581 | (15) | (3,792) | 28
Balance, shares at Sep. 30, 2014 |  | 145 |  |  |  |  |
Balance, value at Dec. 31, 2014 | 4,330 | $ 2 | 2,418 | 5,723 | (27) | (3,815) | 29
Balance, shares at Dec. 31, 2014 |  | 144 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 552 |  |  | 521 |  |  | 31
Net income | 553 |  |  |  |  |  |
Other comprehensive loss, net of taxes | (4) |  |  |  | (4) |  |
Dividends declared | (164) |  |  | (164) |  |  |
Distributions to noncontrolling interests | (28) |  |  |  |  |  | (28)
Issuance of common stock under benefit plans, value | 17 |  | 5 |  |  | 12 |
Issuance of common stock under benefit plans, shares |  | 1 |  |  |  |  |
Stock-based compensation expense | 39 |  | $ 37 |  |  | 2 |
Exercise of stock options, value | 58 |  |  |  |  | 58 |
Exercise of stock options, shares |  | 1 |  |  |  |  |
Shares to cover employee payroll tax withholdings on stock issued under benefit plans, value | (6) |  | $ (6) |  |  |  |
Tax benefits associated with stock-based compensation plans | 4 |  | 4 |  |  |  |
Purchases of treasury stock, value | (174) |  |  |  |  | (174) |
Purchases of treasury stock, shares |  | (2) |  |  |  |  |
Sale of redeembable noncontrolling interest | 11 |  | 11 |  |  |  |
Adjustment to fair value | (14) |  |  | (14) |  |  |
Balance, value at Sep. 30, 2015 | 4,621 | $ 2 | $ 2,469 | $ 6,066 | $ (31) | $ (3,917) | $ 32
Balance, shares at Sep. 30, 2015 |  | 144 |  |  |  |  |
Balance, Value at Dec. 31, 2014 | 0 |  |  |  |  |  |
Redeemable Non-controlling Interest [Abstract] |  |  |  |  |  |  |
Net income | 1 |  |  |  |  |  |
Sale of redeembable noncontrolling interest | 54 |  |  |  |  |  |
Adjustment to fair value | 14 |  |  |  |  |  |
Balance, Value at Sep. 30, 2015 | $ 69 |  |  |  |  |  |

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