Computation of Basic/Diluted Earnings Per Common Share - (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Consolidated net income	$ 2,699	$ 2,197	$ 1,503
Denominator:
Denominator for basic earnings per common share - weighted-average common shares outstanding (in shares)	777	771	767
Effect of dilutive stock options and awards under the treasury stock method (in shares)	7	7	4
Denominator for diluted earnings per common share—weighted-average common shares outstanding plus dilutive common shares under the treasury stock method (in shares)	784	778	771
Basic earnings per common share (in dollars per share)	$ 3.47	$ 2.85	$ 1.96
Diluted earnings per common share (in dollars per share)	$ 3.44	$ 2.82	$ 1.95