Equity and Comprehensive Earnings - Equity activity (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period	$ 3,701	$ 2,830	$ 3,337	$ 3,019
Net earnings	179	240	581	355
Other comprehensive earnings (loss), net of tax, excluding currency translation on assets transferred to held for sale	144	(87)	301	(245)
Common dividends	(66)	(49)	(164)	(148)
Treasury stock purchases	(219)		(368)	(54)
Treasury shares reissued	9	7	25	21
Shares issued and stock compensation for stock options and other stock plans, net of shares exchanged	14	11	42	(14)
Other activity	3	1	11	19
Balance at end of the period	3,765	2,953	3,765	2,953
Common Stock
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period	$ 1,195	$ 1,153	$ 1,167	$ 1,178
Balance (in shares)	680,246	678,484	679,524	676,302
Shares issued and stock compensation for stock options and other stock plans, net of shares exchanged	$ 14	$ 11	$ 42	$ (14)
Shares issued and stock compensation for stock options and other stock plans, net of shares exchanged (in shares)	421	517	1,143	2,699
Balance at end of the period	$ 1,209	$ 1,164	$ 1,209	$ 1,164
Balance (in shares)	680,667	679,001	680,667	679,001
Treasury Stock, Common
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period	$ (3,255)	$ (3,145)	$ (3,130)	$ (3,122)
Balance (in shares)	(353,475)	(352,102)	(351,939)	(351,667)
Treasury stock purchases	$ (219)		$ (368)	$ (54)
Treasury stock purchases (in shares)	(2,429)		(4,201)	(775)
Treasury shares reissued	$ 9	$ 7	$ 25	$ 21
Treasury shares reissued (in shares)	62	80	298	420
Other activity	$ 2	$ 1	$ 10	$ 18
Balance at end of the period	$ (3,463)	$ (3,137)	$ (3,463)	$ (3,137)
Balance (in shares)	(355,842)	(352,022)	(355,842)	(352,022)
Retained Earnings
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period	$ 6,496	$ 5,822	$ 6,192	$ 5,803
Net earnings	179	241	581	358
Common dividends	(66)	(49)	(164)	(148)
Other activity	2		2	1
Balance at end of the period	6,611	6,014	6,611	6,014
Accumulated Other Comprehensive Earnings (Loss).
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period	(797)	(1,068)	(954)	(910)
Other comprehensive earnings (loss), net of tax, excluding currency translation on assets transferred to held for sale	144	(87)	301	(245)
Balance at end of the period	(653)	(1,155)	(653)	(1,155)
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period	62	68	62	70
Net earnings		(1)		(3)
Other activity	(1)		(1)
Balance at end of the period	$ 61	$ 67	$ 61	$ 67