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Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
NUMERATOR:        
Net income (loss) $ (1,157) $ 659 $ (2,166) $ 1,787
DENOMINATOR:        
Weighted-average shares outstanding, basic 590 533 556 542
Dilutive effect of restricted stock units 0 1 0 1
Adjusted weighted-average shares outstanding, diluted 590 534 556 543
NET INCOME (LOSS) PER SHARE:        
Basic $ (1.96) $ 1.24 $ (3.89) $ 3.30
Diluted $ (1.96) $ 1.23 $ (3.89) $ 3.29
Restricted Stock Units (RSUs)        
Antidilutive Securities Excluded from Computation of Earnings Per Share        
Potentially dilutive amounts excluded from calculations 1 0 1 0
Convertible Debt Securities        
Antidilutive Securities Excluded from Computation of Earnings Per Share        
Potentially dilutive amounts excluded from calculations [1] 5 0 2 0
[1] See Note 8 for further information.