Computation of EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Net income available to common shareholders	$ 902	$ 842	$ 1,888	$ 1,591
Weighted average number of common shares	1,347,512	765,958	1,345,942	765,052
Effect of dilutive outstanding equity-based awards	8,322	8,645	10,867	9,277
Weighted average number of diluted common shares	1,355,834	774,603	1,356,809	774,329
Basic EPS	$ 0.67	$ 1.10	$ 1.40	$ 2.08
Diluted EPS	$ 0.67	$ 1.09	$ 1.39	$ 2.06
Anti-dilutive awards	5,081	26	2,806	18