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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, 2019 | $ 24,176 | $ 13,078 | $ (3,631) | $ 18,751 | $ (4,438) | $ 416
Net income (loss) | (10,796) |  |  | (10,810) |  | 14
Currency translation adjustments | (108) |  |  |  | (106) | (2)
Changes in fair value of cash flow hedges | (226) |  |  |  | (226) |
Pension and other postretirement benefit plans | 32 |  |  |  | 32 |
Vesting of restricted stock |  | (131) | 131 |  |  |
Shares issued under employee stock purchase plan | 85 | (95) | 180 |  |  |
Stock repurchase program | (26) |  | (26) |  |  |
Stock-based compensation expense | 213 | 213 |  |  |  |
Dividends declared | (868) |  |  | (868) |  |
Other | (26) | (21) | 7 |  |  | (12)
Balance at Jun. 30, 2020 | 12,456 | 13,044 | (3,339) | 7,073 | (4,738) | 416
Balance at Mar. 31, 2020 | 15,983 | 12,963 | (3,360) | 10,681 | (4,723) | 422
Net income (loss) | (3,428) |  |  | (3,434) |  | 6
Currency translation adjustments | 20 |  |  |  | 19 | 1
Changes in fair value of cash flow hedges | (24) |  |  |  | (24) |
Pension and other postretirement benefit plans | (10) |  |  |  | (10) |
Vesting of restricted stock |  | (14) | 14 |  |  |
Stock-based compensation expense | 105 | 105 |  |  |  |
Dividends declared | (174) |  |  | (174) |  |
Other | (16) | (10) | 7 |  |  | (13)
Balance at Jun. 30, 2020 | 12,456 | 13,044 | (3,339) | 7,073 | (4,738) | 416
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) |  |  |
Net income (loss) | $ 755 |  |  | 730 |  | 25
Currency translation adjustments | (26) |  |  |  | (24) | (2)
Changes in fair value of cash flow hedges | 17 |  |  |  | 17 |
Pension and other postretirement benefit plans | $ 119 |  |  |  | 119 |
Vesting of restricted stock |  | $ (174) | $ 174 |  |  |
Vesting of restricted stock, shares | 2 |  | 2 |  |  |
Shares issued under employee stock purchase plan | $ 62 | (202) | $ 264 |  |  |
Shares issued under employee stock purchase plan, shares | 4 |  | 4 |  |  |
Stock-based compensation expense | $ 156 | 156 |  |  |  |
Dividends declared | (349) |  |  | (349) |  |
Deconsolidation of subsidiary | (123) |  |  |  |  | (123)
Other | (41) | (20) | $ 4 |  | (4) | (21)
Balance at Jun. 30, 2021 | $ 13,059 | $ 12,730 | $ (2,591) | 7,399 | (4,776) | 297
Balance, shares at Jun. 30, 2021 | 1,398 | 1,434 |  |  |  |
Treasury shares, Balance at Jun. 30, 2021 |  |  | (36) |  |  |
Balance at Mar. 31, 2021 | $ 12,972 | $ 12,663 | $ (2,598) | 7,142 | (4,664) | 429
Net income (loss) | 443 |  |  | 431 |  | 12
Currency translation adjustments | (38) |  |  |  | (38) |
Changes in fair value of cash flow hedges | (131) |  |  |  | (131) |
Pension and other postretirement benefit plans | 61 |  |  |  | 61 |
Vesting of restricted stock |  | (3) | 3 |  |  |
Stock-based compensation expense | 72 | 72 |  |  |  |
Dividends declared | (174) |  |  | (174) |  |
Deconsolidation of subsidiary | (123) |  |  |  |  | (123)
Other | (23) | (2) | 4 |  | (4) | (21)
Balance at Jun. 30, 2021 | $ 13,059 | $ 12,730 | $ (2,591) | $ 7,399 | $ (4,776) | $ 297
Balance, shares at Jun. 30, 2021 | 1,398 | 1,434 |  |  |  |
Treasury shares, Balance at Jun. 30, 2021 |  |  | (36) |  |  |

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