Profit Per Share (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share Reconciliation [Abstract]
Profit for the period (A) (in dollars)	[1]	$ 1,943	$ 1,537
Determination of shares (in millions)
Weighted-average number of common shares outstanding (B) (in shares)		516,200,000	534,500,000
Shares issuable on exercise of stock awards, net of shares assumed to be purchased out of proceeds at average market price (in shares)		3,200,000	3,800,000
Average common shares outstanding for fully diluted computation (C) (in shares)	[2]	519,400,000	538,300,000
Assuming no dilution (A/B) (in dollars per share)		$ 3.76	$ 2.88
Assuming full dilution (A/C) (in dollars per share)	[2]	$ 3.74	$ 2.86
Common Stock, Shares, Outstanding		515,900,000	533,400,000
Common shares under SARs and stock options not included in the computation of diluted earnings per share (in shares)		800,000	2,100,000
Stock repurchase
Common shares repurchased (in shares)		1,701,760	3,571,684
Cost of repurchase	[3]	$ 400	$ 720

[1] Profit attributable to common shareholders.

[2] Diluted by assumed exercise of stock-based compensation awards using the treasury stock method.

[3] See Note 12 for additional information.