Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Buildings, machinery and equipment	$ 16,510	$ 16,400
Geothermal properties	1,553	1,501
Other	291	286
Property, Plant and Equipment, Gross	18,354	18,187
Less: Accumulated depreciation	6,851	6,832
Property, Plant and Equipment, Gross, Less Accumulated Depreciation	11,503	11,355
Land	128	121
Construction in progress	332	966
Property, plant and equipment, net	11,963	12,442
Depreciation	627	684	$ 638
Interest Costs, Capitalized During Period	$ 12	$ 29	$ 26
Rotable Parts [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	1 year 6 months
Building, Machinery and Equipment, Gross [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	50 years
Geothermal Properties, Gross [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	13 years
Geothermal Properties, Gross [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	58 years
Property, Plant and Equipment, Other Types [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	3 years
Property, Plant and Equipment, Other Types [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	50 years