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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Millions | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings | Treasury Stock | Non controlling Interest
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2015 | $ 2,168 | $ 0 | $ 956 | $ (10) | $ 1,358 | $ (147) | $ 11
Balance (in shares) at Dec. 31, 2015 |  | 253,710 |  |  |  |  |
Balance Treasury stock (in shares) at Dec. 31, 2015 |  |  |  |  |  | 13,024 |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net earnings | 563 |  |  |  | 562 |  | 1
Other comprehensive (loss) earnings, net of tax | (26) |  |  | (26) |  |  | 0
Common stock issued for acquisitions | 3,105 |  | 3,074 |  |  | $ 31 |
Common stock issued for acquisitions (in shares) |  | 96,436 |  |  |  | 2,750 |
Common stock issued for employee benefit plans | 12 |  | 12 |  |  |  |
Common stock issued for employee benefit plans (in shares) |  | 6,122 |  |  |  |  |
Common stock repurchases | (63) |  |  |  |  | $ (63) |
Common stock repurchases (in shares) |  |  |  |  |  | 2,156 |
Stock compensation expense | 148 |  | 148 |  |  |  |
Contribution from noncontrolling interest | 2 |  |  |  |  |  | 2
Balance at Dec. 31, 2016 | 5,909 | $ 0 | 4,190 | (36) | 1,920 | $ (179) | 14
Balance (in shares) at Dec. 31, 2016 |  | 356,268 |  |  |  |  |
Balance Treasury stock (in shares) at Dec. 31, 2016 |  |  |  |  |  | 12,430 |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net earnings | 828 |  |  |  | 828 |  | 0
Other comprehensive (loss) earnings, net of tax | 33 |  |  | 33 |  |  |
Common stock issued for employee benefit plans | 11 |  | 11 |  |  |  |
Common stock issued for employee benefit plans (in shares) |  | 4,490 |  |  |  |  |
Common stock repurchases | $ (65) |  |  |  |  | $ (65) |
Common stock repurchases (in shares) | 1,000 |  |  |  |  | 1,454 |
Stock compensation expense | $ 135 |  | 135 |  |  |  |
Purchase of noncontrolling interest | 13 |  | 13 |  |  |  |
Balance at Dec. 31, 2017 | $ 6,864 | $ 0 | 4,349 | (3) | 2,748 | $ (244) | 14
Balance (in shares) at Dec. 31, 2017 | 346,874 | 360,758 |  |  |  |  |
Balance Treasury stock (in shares) at Dec. 31, 2017 | 13,884 |  |  |  |  | 13,884 |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net earnings | $ 898 |  |  |  | 900 |  | (2)
Other comprehensive (loss) earnings, net of tax | (53) |  |  | (53) |  |  |
Common stock issued for acquisitions | 507 | $ 0 | 331 |  |  | $ 176 |
Common stock issued for acquisitions (in shares) |  | 0 |  |  |  | 9,787 |
Common stock issued for stock offering | 2,779 | $ 0 | 2,779 |  |  |  |
Stock issued, shares (in shares) |  | 53,207 |  |  |  |  |
Common stock issued for employee benefit plans | 17 | $ 0 | 17 |  |  |  |
Common stock issued for employee benefit plans (in shares) |  | 3,730 |  |  |  |  |
Common stock repurchases | $ (71) |  |  |  |  | $ (71) |
Common stock repurchases (in shares) | 1,000 |  |  |  |  | 1,120 |
Stock compensation expense | $ 145 |  | 145 |  |  |  |
Purchase of noncontrolling interest | (187) |  | (172) |  |  |  | (15)
Acquisition resulting in noncontrolling interest | 99 |  |  |  |  |  | 99
Balance at Dec. 31, 2018 | $ 11,013 | $ 0 | $ 7,449 | $ (56) | $ 3,663 | $ (139) | $ 96
Balance (in shares) at Dec. 31, 2018 | 412,478 | 417,695 |  |  |  |  |
Balance Treasury stock (in shares) at Dec. 31, 2018 | 5,217 |  |  |  |  | 5,217 |

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Name: | us-gaap_TreasuryStockValueAcquiredCostMethod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration