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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 Income (Loss) | Treasury Stock, at Cost | Non-controlling Interests
--- | --- | --- | --- | --- | --- | --- | ---
Balance, value at Dec. 31, 2012 | $ 4,186 | $ 2 | $ 2,371 | $ 4,690 | $ 14 | $ (2,914) | $ 23
Balance, shares at Dec. 31, 2012 |  | 158.0 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 883 |  |  | 849 |  |  | 34
Other comprehensive loss, net of tax | (22) |  |  |  | (22) |  |
Dividends declared | (181) |  |  | (181) |  |  |
Distributions to noncontrolling interests | (32) |  |  |  |  |  | (32)
Issuance of common stock under benefit plans, value | 20 |  | 3 |  |  | 17 |
Issuance of common stock under benefit plans, shares |  | 1.0 |  |  |  |  |
Stock-based compensation expense | 28 |  | 24 |  |  | 4 |
Exercise of stock options, value | 138 |  | (9) |  |  | 147 |
Exercise of stock options, shares |  | 3.0 |  |  |  |  |
Tax benefits associated with stock-based compensation plans | 1 |  | 1 |  |  |  |
Shares to cover employee payroll tax withholdings on stock issued under benefit plans, value | (11) |  | (11) |  |  |  |
Shares to cover employee payroll tax withholdings on stock issued under benefit plans, shares |  | (1.0) |  |  |  |  |
Purchases of treasury stock, value | (1,037) |  |  |  |  | (1,037) |
Purchases of treasury stock, shares |  | (17.0) |  |  |  |  |
Balance, value at Dec. 31, 2013 | 3,973 | $ 2 | 2,379 | 5,358 | (8) | (3,783) | 25
Balance, shares at Dec. 31, 2013 |  | 144.0 |  |  |  |  |
Balance, value at Dec. 31, 2012 | 0 |  |  |  |  |  |
Balance, value at Dec. 31, 2013 | 0 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 592 |  |  | 556 |  |  | 36
Other comprehensive loss, net of tax | (19) |  |  |  | (19) |  |
Dividends declared | (191) |  |  | (191) |  |  |
Distributions to noncontrolling interests | (31) |  |  |  |  |  | (31)
Issuance of common stock under benefit plans, value | 19 |  | 2 |  |  | 17 |
Issuance of common stock under benefit plans, shares |  | 1.0 |  |  |  |  |
Stock-based compensation expense | 51 |  | 48 |  |  | 3 |
Exercise of stock options, value | 78 |  | (2) |  |  | 80 |
Exercise of stock options, shares |  | 1.0 |  |  |  |  |
Tax benefits associated with stock-based compensation plans | (3) |  | (3) |  |  |  |
Shares to cover employee payroll tax withholdings on stock issued under benefit plans, value | (6) |  | (6) |  |  |  |
Purchases of treasury stock, value | (132) |  |  |  |  | (132) |
Purchases of treasury stock, shares |  | (2.0) |  |  |  |  |
Other | (1) |  |  |  |  |  | (1)
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 |  |  |  |  |
Balance, value at Dec. 31, 2014 | 0 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 753 |  |  |  |  |  |
Net income | 751 |  |  | 709 |  |  | 42
Other comprehensive 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 | 1.1 | 1.0 |  |  |  |  |
Tax benefits associated with stock-based compensation plans | $ 5 |  | $ 5 |  |  |  |
Shares to cover employee payroll tax withholdings on stock issued under benefit plans, value | (7) |  | (7) |  |  |  |
Purchases of treasury stock, value | (224) |  |  |  |  | (224) |
Purchases of treasury stock, shares |  | (3.0) |  |  |  |  |
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 |  |  |  |  |
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 |  |  |  |  |  |

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