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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Millions, $ in Millions | Total | Common Stock Issued | Common Stock In Treasury | Retained Earnings | Accumulated Other Comprehensive Loss | Noncontrolling Interests
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 | $ 37,261 | $ 12,975 | $ (4,049) | $ 32,190 | $ (4,274) | $ 419
Net income (loss) | 1,628 |  |  | 1,599 |  | 29
Currency translation adjustments | (132) |  |  |  | (128) | (4)
Changes in unrealized gain on marketable securities | (33) |  |  |  | (33) |
Changes in fair value of cash flow hedges | (8) |  |  |  | (8) |
Pension and other postretirement benefit plans | 130 |  |  |  | 130 |
Shares sold to optionees, less shares exchanged | 29 | (37) | 66 |  |  |
Vesting of restricted stock |  | (63) | 63 |  |  |
Shares issued under employee stock purchase plan | 227 | (67) | 294 |  |  |
Stock repurchase program | (300) |  | (300) |  |  |
Stock-based compensation expense | 259 | 259 |  |  |  |
Dividends declared | (2,077) |  |  | (2,077) |  |
Other | (36) | (9) | 2 |  |  | (29)
Balance at Sep. 30, 2018 | 36,948 | 13,058 | (3,924) | 31,712 | (4,313) | 415
Balance at Jun. 30, 2018 | 36,897 | 13,030 | (4,001) | 31,760 | (4,305) | 413
Net income (loss) | 658 |  |  | 644 |  | 14
Currency translation adjustments | (50) |  |  |  | (47) | (3)
Changes in unrealized gain on marketable securities | (12) |  |  |  | (12) |
Changes in fair value of cash flow hedges | 6 |  |  |  | 6 |
Pension and other postretirement benefit plans | 44 |  |  |  | 44 |
Shares sold to optionees, less shares exchanged | 6 | (7) | 13 |  |  |
Vesting of restricted stock |  | (10) | 10 |  |  |
Shares issued under employee stock purchase plan | 120 | (34) | 154 |  |  |
Stock repurchase program | (100) |  | (100) |  |  |
Stock-based compensation expense | 83 | 83 |  |  |  |
Dividends declared | (692) |  |  | (692) |  |
Other | (12) | (4) |  |  | 1 | (9)
Balance at Sep. 30, 2018 | 36,948 | 13,058 | (3,924) | 31,712 | (4,313) | 415
Balance at Dec. 31, 2018 | $ 36,586 | $ 13,132 | (4,006) | 31,658 | (4,622) | 424
Balance, shares at Dec. 31, 2018 | 1,383 | 1,434 |  |  |  |
Treasury shares, Balance at Dec. 31, 2018 | (51) |  |  |  |  |
Net income (loss) | $ (10,450) |  |  | (10,470) |  | 20
Currency translation adjustments | 14 |  |  |  | 18 | (4)
Changes in fair value of cash flow hedges | (24) |  |  |  | (24) |
Pension and other postretirement benefit plans | 59 |  |  |  | 59 |
Shares sold to optionees, less shares exchanged | $ 23 | $ (26) | 49 |  |  |
Vesting of restricted stock |  | (146) | $ 146 |  |  |
Vesting of restricted stock, shares | 1 |  | 1 |  |  |
Shares issued under employee stock purchase plan | $ 196 | (249) | $ 445 |  |  |
Shares issued under employee stock purchase plan, shares | 6 |  | 6 |  |  |
Stock repurchase program | $ (278) |  | $ (278) |  |  |
Stock repurchase program, shares | (7) |  | (7) |  |  |
Stock-based compensation expense | $ 329 | 329 |  |  |  |
Dividends declared | (2,077) |  |  | (2,077) |  |
Other | (51) | (28) | $ 3 |  |  | (26)
Balance at Sep. 30, 2019 | $ 24,327 | $ 13,012 | $ (3,641) | 19,111 | (4,569) | 414
Balance, shares at Sep. 30, 2019 | 1,384 | 1,434 |  |  |  |
Treasury shares, Balance at Sep. 30, 2019 | (50) |  |  |  |  |
Shares sold to optionees, less shares exchanged | 1 |  | 1 |  |  |
Balance at Jun. 30, 2019 | $ 36,273 | $ 13,037 | $ (3,827) | 31,186 | (4,544) | 421
Net income (loss) | (11,373) |  |  | (11,383) |  | 10
Currency translation adjustments | (25) |  |  |  | (21) | (4)
Changes in fair value of cash flow hedges | (24) |  |  |  | (24) |
Pension and other postretirement benefit plans | 20 |  |  |  | 20 |
Vesting of restricted stock |  | (20) | 20 |  |  |
Shares issued under employee stock purchase plan | 111 | (134) | 245 |  |  |
Stock repurchase program | (79) |  | (79) |  |  |
Stock-based compensation expense | 135 | 135 |  |  |  |
Dividends declared | (692) |  |  | (692) |  |
Other | (19) | (6) |  |  |  | (13)
Balance at Sep. 30, 2019 | $ 24,327 | $ 13,012 | $ (3,641) | $ 19,111 | $ (4,569) | $ 414
Balance, shares at Sep. 30, 2019 | 1,384 | 1,434 |  |  |  |
Treasury shares, Balance at Sep. 30, 2019 | (50) |  |  |  |  |

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