Computation of EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income available to common shareholders	$ 3,028	$ 3,063	$ 2,220
Weighted average number of common shares	805,104	772,963	799,217
Effect of dilutive outstanding equity-based awards	10,100	10,521	11,760
Weighted average number of diluted common shares	815,204	783,484	810,977
Basic EPS	$ 3.76	$ 3.96	$ 2.78
Diluted EPS	$ 3.71	$ 3.91	$ 2.74
Anti-dilutive awards	4	22	210