Computation of Basic/Diluted Earnings Per Common Share - (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Numerator:
Consolidated net income	$ 395	$ 619
Denominator:
Denominator for basic earnings per common share - weighted-average common shares outstanding (in shares)	780	775
Effect of dilutive stock options and awards under the treasury stock method (in shares)	6	8
Denominator for diluted earnings per common share—weighted-average common shares outstanding plus dilutive common shares under the treasury stock method (in shares)	786	783
Basic earnings per common share (in dollars per share)	$ 0.51	$ 0.80
Diluted earnings per common share (in dollars per share)	$ 0.50	$ 0.79