Restructuring, Impairment and Other - Narrative (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring and Related Activities [Abstract]
Restructuring, impairment and other	$ 59	$ 66	$ 146	$ 162	$ 119	$ 191	$ 59	$ 42	$ 433	$ 412	$ 516
Restructuring charges									304	385	293
Estimated remaining charges	$ 82								82
Restructuring Cost and Reserve [Line Items]
Amortization expense for intangible assets included in net income									455	387	239
Restructuring, impairment and other charges
Restructuring Cost and Reserve [Line Items]
Other asset impairment charges and foreign currency translation gain (loss), realized									129	27	223
Currency gain (loss)										(12)	(138)
Trade names and trademarks
Restructuring Cost and Reserve [Line Items]
Amortization expense for intangible assets included in net income									80
Corporate
Restructuring and Related Activities [Abstract]
Restructuring charges									31	$ 29	$ 27
Corporate | Restructuring, impairment and other charges
Restructuring Cost and Reserve [Line Items]
Legal Fees									25
Turbomachinery and Process Solutions and Oilfield Services | Operating segments | Restructuring, impairment and other charges
Restructuring Cost and Reserve [Line Items]
Business Exit Costs									$ 13