Supplemental Financial Information - Income Statement (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Supplemental Financial Information
Earnings from continuing operations allocated to common shares	$ 1,226	$ 954	$ 2,302	$ 2,622
Net earnings allocated to common shares	$ 1,226	$ 954	$ 2,322	$ 2,622