Business Acquisition and Disposition - Narrative (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended								6 Months Ended	12 Months Ended
	Jul. 03, 2017	Oct. 31, 2018	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Transaction related costs			$ 41	$ 17	$ 50	$ 46	$ 63	$ 159	$ 85	$ 66		$ 153	$ 373	$ 33
GE Transaction Agreement
Business Acquisition [Line Items]
Consideration transferred	$ 24,798
Acquisition remeasurement, goodwill											$ 911
Acquisition remeasurement, property, plant and equipment											(362)
Acquisition remeasurement, equity method investment											(228)
Acquisition remeasurement, intangible assets											(123)
Acquisition remeasurement, other liabilities											314
Acquisition remeasurement, depreciation and amortization expense											$ (33)
Natural Gas Solutions (NGS) [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Business Acquisition [Line Items]
Sales price		$ 375
Gain (loss) on sale, before taxes		$ 171