Computation of EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net income available to common shareholders	$ 1,068	$ 735	$ 2,956	$ 2,326
Weighted average number of common shares	1,347,916	766,167	1,346,605	765,428
Effect of dilutive outstanding equity-based awards	10,206	9,624	10,569	9,479
Weighted average number of diluted common shares	1,358,122	775,791	1,357,174	774,907
Basic EPS	$ 0.79	$ 0.96	$ 2.20	$ 3.04
Diluted EPS	$ 0.79	$ 0.95	$ 2.18	$ 3.00
Anti-dilutive awards	1,647	0	3,267	0