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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Common stock issuances |  |  |  |
Balance at the beginning of the year (in shares) |  |  | 895,115,637 |
Balance at the end of the year (in shares) | 1,043,640,621 |  | 1,043,640,621 |
Basic earnings (loss) per common share |  |  |  |
Net income (loss) attributable to common stockholders | $ (912) | $ 1,869 | $ 354 | $ 3,425
Less: Net income allocated to participating securities | 0 | 8 | 1 | 16
Net income (loss), net of participating securities | $ (912) | $ 1,861 | $ 353 | $ 3,409
Weighted average number of basic shares (in shares) | 845,700,000 | 761,700,000 | 781,100,000 | 764,300,000
Net income (loss) attributable to common stockholders per share—basic (in usd per share) | $ (1.08) | $ 2.44 | $ 0.45 | $ 4.46
Diluted earnings (loss) per common share |  |  |  |
Net income (loss), net of participating securities | $ (912) | $ 1,861 | $ 353 | $ 3,409
Weighted average number of basic shares (in shares) | 845,700,000 | 761,700,000 | 781,100,000 | 764,300,000
Dilutive securities (in shares) | 0 | 1,600,000 | 1,100,000 | 1,500,000
Total diluted weighted average common shares (in shares) | 845,700,000 | 763,300,000 | 782,200,000 | 765,800,000
Net income (loss) attributable to common stockholders per share—diluted (in usd per share) | $ (1.08) | $ 2.44 | $ 0.45 | $ 4.45
Accumulated other comprehensive loss |  |  |  |
Beginning balance | $ 21,347 | $ 20,931 | $ 21,330 | $ 20,572
Other comprehensive loss, before reclassifications |  |  | (160) |
Ending balance | 41,005 | 21,488 | $ 41,005 | 21,488
Anadarko |  |  |  |
Common stock issuances |  |  |  |
Treasury stock (in shares) |  |  | 2,000,000 |
Common Stock |  |  |  |
Common stock issuances |  |  |  |
Issued in the ordinary course (in shares) |  |  | 2,394,000 |
Issued as part of the Merger (in shares) |  |  | 146,131,000 |
Accumulated other comprehensive loss |  |  |  |
Beginning balance | 179 | 179 | $ 179 | 179
Ending balance | 209 | 179 | 209 | 179
Gains and (losses) on derivatives |  |  |  |
Accumulated other comprehensive loss |  |  |  |
Beginning balance |  |  | 5 |
Other comprehensive loss, before reclassifications |  |  | (130) |
Ending balance | (125) |  | (125) |
Pension and postretirement benefit plans |  |  |  |
Accumulated other comprehensive loss |  |  |  |
Beginning balance |  |  | (170) |
Other comprehensive loss, before reclassifications |  |  | (30) |
Ending balance | (200) |  | (200) |
Foreign currency translation adjustments |  |  |  |
Accumulated other comprehensive loss |  |  |  |
Beginning balance |  |  | (7) |
Other comprehensive loss, before reclassifications |  |  | 0 |
Ending balance | (7) |  | (7) |
Accumulated Other Comprehensive Loss |  |  |  |
Accumulated other comprehensive loss |  |  |  |
Beginning balance | (184) | (308) | (172) | (258)
Ending balance | $ (332) | $ (155) | $ (332) | $ (155)

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