Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
EARNINGS PER SHARE
Earnings from continuing operations allocated to common shares	$ 7,042	$ 4,449	$ 3,666
Net earnings allocated to common shares	$ 7,042	$ 4,473	$ 3,666