Investments - Unrealized Gain (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Investments [Abstract]
Net gains/(losses) recognized during the period on equity investments	$ (2,716)	$ 200
Less: Net gains/(losses) recognized during the period on equity investments sold during the period	92	0
Total unrealized gains/(losses) on equity investments still held at December 31, 2021	$ (2,808)	$ 200