Profit Per Share (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021	Jul. 01, 2018
Earnings Per Share [Abstract]
Profit for the period (A) (in dollars)	[1]	$ 1,537	$ 1,530
Determination of shares (in millions)
Weighted-average number of common shares outstanding (B) (in shares)		534,500,000	546,400,000
Shares issuable on exercise of stock awards, net of shares assumed to be purchased out of proceeds at average market price (in shares)		3,800,000	5,000,000.0
Average common shares outstanding for fully diluted computation (C) (in shares)	[2]	538,300,000	551,400,000
Profit (loss) per share of common stock:
Assuming no dilution (A/B) (in dollars per share)		$ 2.88	$ 2.80
Assuming full dilution (A/C) (in dollars per share)	[2]	$ 2.86	$ 2.77
Shares outstanding as of March 31 (in millions)		533,400,000	547,800,000
Common shares under SARs and stock options not included in the computation of diluted earnings per share (in shares)		2,100,000	1,100,000
Stock repurchase
Stock repurchase program, authorized amount				$ 10,000
Stock repurchase program, remaining authorized repurchase amount		$ 1,400
Common shares repurchased (in shares)		3,571,684	0
Cost of repurchase	[3]	$ 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