Computation of EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net income available to common shareholders	$ 1,559	$ 902	$ 2,893	$ 1,888
Weighted average number of common shares	1,338,302	1,347,512	1,341,963	1,345,942
Effect of dilutive outstanding equity-based awards	11,190	8,322	12,247	10,867
Weighted average number of diluted common shares	1,349,492	1,355,834	1,354,210	1,356,809
Basic EPS	$ 1.16	$ 0.67	$ 2.16	$ 1.40
Diluted EPS	$ 1.16	$ 0.67	$ 2.14	$ 1.39
Anti-dilutive awards	0	5,081	3	2,806