Progress Collections and Deferred Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Progress collections and deferred income (contract liabilities)	$ 3,196		$ 2,870
Revenue recognized, included in contract liability	410	$ 553
Progress collections
Disaggregation of Revenue [Line Items]
Progress collections and deferred income (contract liabilities)	3,066		2,760
Deferred income
Disaggregation of Revenue [Line Items]
Progress collections and deferred income (contract liabilities)	$ 130		$ 110