Intangible Assets and Goodwill (Details 2) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 02, 2018
Changes in carrying amount of goodwill by reportable segment:
Goodwill, beginning of period	$ 7,397
Impairments, beginning of period	(1,197)
Net goodwill, beginning of period	6,200
Goodwill Acquired	124
Goodwill impairment charge	0	$ 0
Other adjustments	52
Goodwill, end of period	7,573
Impairments, end of period	(1,197)
Net goodwill, end of period	6,376
Goodwill	6,200
Construction Industries
Changes in carrying amount of goodwill by reportable segment:
Goodwill, beginning of period	305
Impairments, beginning of period	(22)
Net goodwill, beginning of period	283
Goodwill Acquired	0
Other adjustments	8
Goodwill, end of period	313
Impairments, end of period	(22)
Net goodwill, end of period	291
Goodwill	283
Resource Industries
Changes in carrying amount of goodwill by reportable segment:
Goodwill, beginning of period	4,232
Impairments, beginning of period	(1,175)
Net goodwill, beginning of period	3,057
Goodwill Acquired	0
Other adjustments	24
Goodwill, end of period	4,256
Impairments, end of period	(1,175)
Net goodwill, end of period	3,081
Goodwill	3,057
Energy & Transportation
Changes in carrying amount of goodwill by reportable segment:
Goodwill, beginning of period	2,806
Goodwill Acquired	124
Other adjustments	16
Goodwill, end of period	2,946
All Other
Changes in carrying amount of goodwill by reportable segment:
Goodwill, beginning of period	54
Goodwill Acquired	0
Other adjustments	4
Goodwill, end of period	$ 58
ECM S.p.A.
Changes in carrying amount of goodwill by reportable segment:
Goodwill			$ 112
Downer Freight Rail
Changes in carrying amount of goodwill by reportable segment:
Goodwill			$ 12