Income Taxes (Income From Continuing Operations Before Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Domestic operations	$ 37,576	$ 16,426	$ 15,779
Foreign operations	10,506	23,199	19,134
Total	$ 48,082	$ 39,625	$ 34,913