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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - 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
Balance, shares at Dec. 31, 2017 | 1,384 | 1,434 |  |  |  |
Treasury shares, Balance at Dec. 31, 2017 |  |  | (50) |  |  |
Net income (loss) | $ 2,177 |  |  | 2,138 |  | 39
Currency translation adjustments | (196) |  |  |  | (191) | (5)
Changes in unrealized gain on marketable securities | (11) |  |  |  | (11) |
Changes in fair value of cash flow hedges | (15) |  |  |  | (15) |
Pension and other postretirement benefit plans | (22) |  |  |  | (22) |
Shares sold to optionees, less shares exchanged | $ 34 | $ (41) | $ 75 |  |  |
Shares sold to optionees, less shares exchanged, shares | 1 |  | 1 |  |  |
Vesting of restricted stock |  | (72) | $ 72 |  |  |
Vesting of restricted stock, shares | 1 |  | 1 |  |  |
Shares issued under employee stock purchase plan | $ 227 | (67) | $ 294 |  |  |
Shares issued under employee stock purchase plan, shares | 3 |  | 3 |  |  |
Stock repurchase program | $ (400) |  | $ (400) |  |  |
Stock repurchase program, shares | (6) |  | (6) |  |  |
Stock-based compensation expense | $ 345 | 345 |  |  |  |
Dividends declared | (2,770) |  |  | (2,770) |  |
Stranded tax related to US pension | (109) |  |  | 109 | (109) |
Other | (44) | (8) | $ 2 | (9) |  | (29)
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) | $ (10,107) |  |  | (10,137) |  | 30
Currency translation adjustments | 66 |  |  |  | 67 | (1)
Changes in fair value of cash flow hedges | (22) |  |  |  | (22) |
Pension and other postretirement benefit plans | 139 |  |  |  | 139 |
Shares sold to optionees, less shares exchanged | $ 23 | $ (26) | $ 49 |  |  |
Shares sold to optionees, less shares exchanged, shares | 1 |  | 1 |  |  |
Vesting of restricted stock |  | (155) | $ 155 |  |  |
Vesting of restricted stock, shares | 2 |  | 2 |  |  |
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 | $ 405 | 405 |  |  |  |
Dividends declared | (2,770) |  |  | (2,770) |  |
Other | (62) | (29) | $ 4 |  |  | (37)
Balance at Dec. 31, 2019 | $ 24,176 | $ 13,078 | $ (3,631) | 18,751 | (4,438) | 416
Balance, shares at Dec. 31, 2019 | 1,385 | 1,434 |  |  |  |
Treasury shares, Balance at Dec. 31, 2019 |  |  | (49) |  |  |
Net income (loss) | $ (10,486) |  |  | (10,518) |  | 32
Currency translation adjustments | (232) |  |  |  | (239) | 7
Changes in fair value of cash flow hedges | (36) |  |  |  | (36) |
Pension and other postretirement benefit plans | $ (171) |  |  |  | (171) |
Shares sold to optionees, less shares exchanged, shares | 6 |  | 6 |  |  |
Vesting of restricted stock |  | $ (173) | $ 173 |  |  |
Vesting of restricted stock, shares | 2 |  | 2 |  |  |
Shares issued under employee stock purchase plan | $ 146 | (298) | $ 444 |  |  |
Stock repurchase program | $ (26) |  | $ (26) |  |  |
Stock repurchase program, shares | (1) |  | (1) |  |  |
Stock-based compensation expense | $ 397 | 397 |  |  |  |
Dividends declared | (1,215) |  |  | (1,215) |  |
Other | (64) | (34) | $ 7 |  |  | (37)
Balance at Dec. 31, 2020 | $ 12,489 | $ 12,970 | $ (3,033) | $ 7,018 | $ (4,884) | $ 418
Balance, shares at Dec. 31, 2020 | 1,392 | 1,434 |  |  |  |
Treasury shares, Balance at Dec. 31, 2020 |  |  | (42) |  |  |

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