Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
NUMERATOR:
Net income (loss)	$ (915)	$ 741	$ (1,009)	$ 1,128
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted Average Number of Shares Outstanding, Basic and Diluted	563	542	539	547
Earnings (Loss) Per Share, Basic and Diluted	$ (1.63)	$ 1.37	$ (1.87)	$ 2.06