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STOCKHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 08, 2019 | Jan. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Common stock issuances |  |  |  |  |  |
Balance at the beginning of the year (in shares) |  | 1,044,435,000 | 895,116,000 | 893,469,000 | 892,215,000 |
Issued (in shares) |  |  | 3,188,000 | 1,628,000 | 1,252,000 |
Options exercised and other, net (in shares) |  |  |  | 19,000 | 2,000 |
Issued as part of the Acquisition (in shares) |  |  | 146,131,000 |  |  |
Balance at the end of the year (in shares) |  |  | 1,044,435,000 | 895,116,000 | 893,469,000 |
TREASURY STOCK |  |  |  |  |  |
Share repurchase program, authorized shares |  |  | 185,000,000 |  |  |
Share repurchase program, shares yet to be repurchased |  |  | 44,200,000 |  |  |
Shares purchased under share repurchase program |  |  | 2,700,000 | 16,900,000 | 0 |
Share repurchase program, average cost per share of shares repurchased during period (in dollars per share) |  |  | $ 66.94 | $ 74.92 |  |
Treasury stock, shares (in shares) |  |  | 150,323,151 | 145,726,051 | 128,400,000 |
NONREDEEMABLE PREFERRED STOCK |  |  |  |  |  |
Preferred stock, authorized shares (in shares) |  |  | 50,000,000 |  |  |
Preferred stock, par value (in dollars per share) |  |  | $ 1.00 |  |  |
Issued as part of the Acquisition (in shares) |  |  | 146,131,000 |  |  |
Preferred stock, shares outstanding (in shares) |  |  | 100,000 | 0 | 0 |
Preferred stock issued (in shares) |  |  | 100,000 |  |  |
Basic earnings per common share |  |  |  |  |  |
Income (loss) from continuing operations |  |  | $ (507) | $ 4,131 | $ 1,311 |
Loss from discontinued operations, net of tax |  |  | (15) | 0 | 0 |
NET INCOME (LOSS) |  |  | (522) | 4,131 | 1,311 |
Less: Net income attributable to noncontrolling interest |  |  | (145) | 0 | 0 |
Less: Preferred stock dividends |  |  | (318) | 0 | 0 |
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCKHOLDERS |  |  | (985) | 4,131 | 1,311 |
Less: Net income allocated to participating securities |  |  | 0 | (17) | (6) |
Net income (loss), net of participating securities |  |  | $ (985) | $ 4,114 | $ 1,305 |
Weighted average number of basic shares (in shares) |  |  | 809,500,000 | 761,700,000 | 765,100,000 |
Basic earnings (loss) per common share (in dollars per share) |  |  | $ (1.22) | $ 5.40 | $ 1.71 |
Diluted EPS |  |  |  |  |  |
Net income (loss), net of participating securities |  |  | $ (985) | $ 4,114 | $ 1,305 |
Weighted average number of basic shares (in shares) |  |  | 809,500,000 | 761,700,000 | 765,100,000 |
Dilutive securities (in shares) |  |  | 0 | 1,600,000 | 800,000 |
Total diluted weighted average common shares (in shares) |  |  | 809,500,000 | 763,300,000 | 765,900,000 |
Diluted earnings (loss) per common share (in dollars per share) |  |  | $ (1.22) | $ 5.39 | $ 1.70 |
ACCUMULATED OTHER COMPREHENSIVE LOSS |  |  |  |  |  |
Accumulated other comprehensive loss |  |  | $ 34,232 | $ 21,330 | $ 20,572 | $ 21,497
Subsequent Event |  |  |  |  |  |
NONREDEEMABLE PREFERRED STOCK |  |  |  |  |  |
Payments of Ordinary Dividends, Preferred Stock and Preference Stock |  | $ 200 |  |  |  |
Anadarko Petroleum Corporation | Series A Preferred Stock |  |  |  |  |  |
Common stock issuances |  |  |  |  |  |
Issued as part of the Acquisition (in shares) | 100,000 |  |  |  |  |
NONREDEEMABLE PREFERRED STOCK |  |  |  |  |  |
Issued as part of the Acquisition (in shares) | 100,000 |  |  |  |  |
Liquidation preference (in dollars per share) | $ 105,000 |  |  |  |  |
Dividend rate | 8.00% |  |  |  |  |
Dividend rate for unpaid amounts | 9.00% |  |  |  |  |
Common Stock |  |  |  |  |  |
ACCUMULATED OTHER COMPREHENSIVE LOSS |  |  |  |  |  |
Accumulated other comprehensive loss |  |  | $ 209 | 179 | 179 | 178
Common Stock | Anadarko Petroleum Corporation |  |  |  |  |  |
Common stock issuances |  |  |  |  |  |
Issued as part of the Acquisition (in shares) |  |  | 2,000,000 |  |  |
NONREDEEMABLE PREFERRED STOCK |  |  |  |  |  |
Issued as part of the Acquisition (in shares) |  |  | 2,000,000 |  |  |
Foreign currency translation adjustments |  |  |  |  |  |
ACCUMULATED OTHER COMPREHENSIVE LOSS |  |  |  |  |  |
Accumulated other comprehensive loss |  |  | $ (7) | (7) |  |
Unrealized gains (losses) on derivatives |  |  |  |  |  |
ACCUMULATED OTHER COMPREHENSIVE LOSS |  |  |  |  |  |
Accumulated other comprehensive loss |  |  | (122) | 5 |  |
Pension and postretirement adjustments |  |  |  |  |  |
ACCUMULATED OTHER COMPREHENSIVE LOSS |  |  |  |  |  |
Accumulated other comprehensive loss |  |  | (92) | (170) |  |
Accumulated Other Comprehensive Loss |  |  |  |  |  |
ACCUMULATED OTHER COMPREHENSIVE LOSS |  |  |  |  |  |
Accumulated other comprehensive loss |  |  | $ (221) | $ (172) | $ (258) | $ (266)

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