Net Income (Loss) Per Share - Schedule of basic and diluted net income per share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Income (loss) from continuing operations	$ (536)	$ 294	$ (1,875)	$ 862
Income (loss) from discontinued operations, net of income taxes	5	10,440	3	10,513
Net income (loss)	$ (531)	$ 10,734	$ (1,872)	$ 11,375
Denominator:
Weighted average shares of common stock - basic (in shares)	556	674	571	678
Dilutive effect of equity incentive awards (in shares)	0	11	0	11
Weighted average shares of common stock - diluted (in shares)	556	685	571	689
Income (loss) per share - basic:
Continuing operations (in usd per share)	$ (0.96)	$ 0.44	$ (3.28)	$ 1.27
Discontinued operations (in usd per share)	0.01	15.48	0.01	15.52
Net income (loss) per share - basic (in usd per share)	(0.95)	15.92	(3.27)	16.79
Income (loss) per share - diluted:
Continuing operations (in usd per share)	(0.96)	0.43	(3.28)	1.25
Discontinued operations (in usd per share)	0.01	15.25	0.01	15.27
Net income (loss) per share - diluted (in usd per share)	$ (0.95)	$ 15.68	$ (3.27)	$ 16.52
Common stock equivalents excluded from income (loss) per diluted share because their effect would have been anti-dilutive (in shares)	16	8	16	9