Intangible assets and goodwill (Details 2 Goodwill) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill by reportable segment
Goodwill impairment charge	$ 0	$ 0	$ 0
Changes in carrying amount of goodwill by reportable segment:
Goodwill, beginning of year	7,591	7,393
Impairments, beginning of year	(1,197)	(1,197)
Goodwill, Acquired	75	41
Other Adjustments	(145)	157
Goodwill, end of year	7,521	7,591	7,393
Impairments, end of year	(1,197)	(1,197)	(1,197)
Net goodwill, end of year	6,324	6,394	6,196
Net goodwill, beginning of year	6,394	6,196
Construction Industries
Changes in carrying amount of goodwill by reportable segment:
Goodwill, beginning of year	320	306
Impairments, beginning of year	(22)	(22)
Goodwill, Acquired	4	0
Other Adjustments	(22)	14
Goodwill, end of year	302	320	306
Impairments, end of year	(22)	(22)	(22)
Net goodwill, end of year	280	298	284
Net goodwill, beginning of year	298	284
Resource Industries
Changes in carrying amount of goodwill by reportable segment:
Goodwill, beginning of year	4,253	4,156
Impairments, beginning of year	(1,175)	(1,175)
Goodwill, Acquired	22	0
Other Adjustments	(93)	97
Goodwill, end of year	4,182	4,253	4,156
Impairments, end of year	(1,175)	(1,175)	(1,175)
Net goodwill, end of year	3,007	3,078	2,981
Net goodwill, beginning of year	3,078	2,981
Energy & Transportation
Changes in carrying amount of goodwill by reportable segment:
Goodwill, beginning of year	2,959	2,875
Goodwill, Acquired	49	41
Other Adjustments	(23)	43
Goodwill, end of year	2,985	2,959	2,875
All Other
Changes in carrying amount of goodwill by reportable segment:
Goodwill, beginning of year	59	56
Goodwill, Acquired	0	0
Other Adjustments	(7)	3
Goodwill, end of year	$ 52	$ 59	$ 56