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Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
NUMERATOR:    
Net income (loss) $ (278) $ 116
DENOMINATOR:    
Weighted-average shares outstanding, Basic (in shares) 592 591
Dilutive effects of convertible notes (in shares) 0 16
Dilutive effect of stock warrants (in shares) 0 1
Dilutive effect of restricted stock units (in shares) 0 1
Diluted (in shares) 592 609
NET INCOME (LOSS) PER SHARE:    
BASIC (in USD per share) $ (0.47) $ 0.20
DILUTED (in USD per share) $ (0.47) 0.19
Initial conversion price (in USD per share)   $ 38.48
Convertible Debt Securities    
Antidilutive Securities Excluded from Computation of Earnings Per Share    
Potentially dilutive amounts excluded from calculations (in shares) 47