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CONSOLIDATED STATEMENT OF 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, 2016 | $ 41,529 | $ 12,801 | $ (3,550) | $ 36,470 | $ (4,643) | $ 451
Net income | 203 |  |  | 205 |  | (2)
Currency translation adjustments | (26) |  |  |  | (26) |
Changes in unrealized gain on marketable securities | (25) |  |  |  | (25) |
Changes in fair value of cash flow hedges | 19 |  |  |  | 19 |
Pension and other postretirement benefit plans | 117 |  |  |  | 117 |
Shares sold to optionees, less shares exchanged | 47 | (33) | 80 |  |  |
Vesting of restricted stock |  | (80) | 80 |  |  |
Shares issued under employee stock purchase plan | 96 | (12) | 108 |  |  |
Stock repurchase program | (770) |  | (770) |  |  |
Stock-based compensation expense | 180 | 180 |  |  |  |
Dividends declared | (1,391) |  |  | (1,391) |  |
Other | (27) | (13) | 3 |  |  | (17)
Balance at Jun. 30, 2017 | 39,952 | 12,843 | (4,049) | 35,284 | (4,558) | 432
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 | $ 971 |  |  | 955 |  | 16
Currency translation adjustments | (82) |  |  |  | (81) | (1)
Changes in unrealized gain on marketable securities | (21) |  |  |  | (21) |
Changes in fair value of cash flow hedges | (15) |  |  |  | (15) |
Pension and other postretirement benefit plans | 86 |  |  |  | 86 |
Shares sold to optionees, less shares exchanged | $ 26 | $ (27) | 53 |  |  |
Vesting of restricted stock |  | (52) | $ 52 |  |  |
Vesting of restricted stock, shares | 1 |  | 1 |  |  |
Shares issued under employee stock purchase plan | $ 107 | (33) | $ 140 |  |  |
Shares issued under employee stock purchase plan, shares | 2 |  | 2 |  |  |
Stock repurchase program | $ (200) |  | $ (200) |  |  |
Stock repurchase program, shares | (3) |  | (3) |  |  |
Stock-based compensation expense | $ 176 | 176 |  |  |  |
Dividends declared | (1,385) |  |  | (1,385) |  |
Other | (27) | (9) | $ 3 |  |  | (21)
Balance at Jun. 30, 2018 | $ 36,897 | $ 13,030 | $ (4,001) | $ 31,760 | $ (4,305) | $ 413
Balance, shares at Jun. 30, 2018 | 1,384 | 1,434 |  |  |  |
Treasury shares, Balance at Jun. 30, 2018 | (50) |  |  |  |  |

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