Equity and Accumulated Other Comprehensive Earnings - Equity activity (Details) - USD ($) shares in Thousands, $ in Millions	1 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2019	May 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period			$ 2,700	$ 3,649	$ 3,019	$ 3,562
Net earnings			92	197	115	314
Other comprehensive earnings (loss), net of tax, excluding currency translation on assets transferred to held for sale			71	(8)	(158)	117
Common dividends, net of tax benefits			(50)	(50)	(99)	(84)
Treasury stock purchases				(251)	(54)	(380)
Treasury stock purchases (in shares)	(100)	(3,400)
Treasury shares reissued			7	7	14	12
Shares issued and stock compensation for stock options and other stock plans, net of shares exchanged			2	18	(25)	15
Other activity			8	2	18	8
Balance at end of the period	$ 3,564		2,830	3,564	2,830	3,564
Common Stock
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period			$ 1,151	$ 1,154	$ 1,178	$ 1,157
Balance (in shares)			678,128	674,692	676,302	673,237
Shares issued and stock compensation for stock options and other stock plans, net of shares exchanged			$ 2	$ 18	$ (25)	$ 15
Shares issued and stock compensation for stock options and other stock plans, net of shares exchanged (in shares)			356	771	2,182	2,226
Balance at end of the period	$ 1,172		$ 1,153	$ 1,172	$ 1,153	$ 1,172
Balance (in shares)	675,463		678,484	675,463	678,484	675,463
Treasury Stock, Common
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period			$ (3,159)	$ (2,323)	$ (3,122)	$ (2,205)
Balance (in shares)			(352,209)	340,223	351,667	337,979
Treasury stock purchases				$ (251)	$ (54)	$ (380)
Treasury stock purchases (in shares)				(3,540)	(774)	(6,174)
Treasury shares reissued			$ 7	$ 7	$ 14	$ 12
Treasury shares reissued (in shares)			106	140	338	530
Other activity			$ 7	$ 1	$ 17	$ 7
Other activity (in shares)			1		1
Balance at end of the period	$ (2,566)		$ (3,145)	$ (2,566)	$ (3,145)	$ (2,566)
Balance (in shares)	343,623		352,102	343,623	352,102	343,623
Retained Earnings
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period			$ 5,777	$ 5,504	$ 5,803	$ 5,341
Net earnings			94	197	117	314
Reclassification of stranded tax effects						79
Common dividends, net of tax benefits			(50)	(50)	(99)	(84)
Other activity			1		1	1
Balance at end of the period	$ 5,651		5,822	5,651	5,822	5,651
Accumulated Other Comprehensive Earnings (Loss).
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period			(1,139)	(789)	(910)	(835)
Other comprehensive earnings (loss), net of tax, excluding currency translation on assets transferred to held for sale			71	(8)	(158)	117
Reclassification of stranded tax effects						(79)
Balance at end of the period	(797)		(1,068)	(797)	(1,068)	(797)
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period			70	103	70	104
Net earnings			(2)		(2)
Other activity				1
Balance at end of the period	$ 104		$ 68	$ 104	$ 68	$ 104