Supplemental Financial Information - Income Statement (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Supplemental Financial Information
Earnings from continuing operations allocated to common shares	$ 1,184	$ 534	$ 2,969	$ 1,075
Net earnings allocated to common shares	$ 1,184	$ 534	$ 2,969	$ 1,095