Profit Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2023		Sep. 30, 2022		Sep. 30, 2023		Sep. 30, 2022
Earnings Per Share Reconciliation [Abstract]
Profit for the period (A) (in dollars)	$ 2,794	[1]	$ 2,041	[1]	$ 7,659	[2]	$ 5,251	[2]
Determination of shares (in millions):
Weighted-average number of common shares outstanding (B) (in shares)	509,800,000		525,000,000.0		513,000,000.0		530,100,000
Shares issuable on exercise of stock awards, net of shares assumed to be purchased out of proceeds at average market price (in shares)	2,800,000		2,600,000		2,700,000		3,100,000
Average common shares outstanding for fully diluted computation (C) (in shares)	512,600,000	[3]	527,600,000	[3]	515,700,000	[4]	533,200,000	[4]
Profit per share of common stock:
Assuming no dilution (A/B) (in dollars per share)	$ 5.48		$ 3.89		$ 14.93		$ 9.91
Assuming full dilution (A/C) (in dollars per share)	$ 5.45	[3]	$ 3.87	[3]	$ 14.85	[4]	$ 9.85	[4]
Shares outstanding as of June 30 (in shares)	509,100,000		520,400,000		509,100,000		520,400,000
Common shares under SARs and stock options not included in the computation of diluted earnings per share (in shares)	800,000		2,100,000		800,000		2,100,000
Common shares repurchased (in shares)	1,883,487		7,575,322		9,499,655		17,007,819
Cost of repurchase	$ 530	[5]	$ 1,385	[5]	$ 2,209	[6]	$ 3,309	[6]

[1] Profit attributable to common shareholders.

[2] Profit attributable to common shareholders.

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

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

[5] 1 See Note 12 for additional information.

[6] 2 See Note 12 for additional information.