Earnings /(Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Net income/(loss)	$ 280	$ (12,385)	$ 4,767
Basic weighted average shares outstanding (shares)	636	636	651
Dilutive effect of share-based awards (shares)	5	0	2
Diluted weighted average shares outstanding (shares)	641	636	653
Basic earnings (loss) per share (USD per share)	$ 0.44	$ (19.49)	$ 7.32
Diluted earnings (loss) per share (USD per share)	$ 0.44	$ (19.49)	$ 7.30