Other Assets (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Other Assets [Line Items]
Net receivable balance recorded in Other assets	$ 2,027	$ 1,416
Spirit Aerosystems [Member]
Other Assets [Line Items]
Loss Contingency, Receivable	137	143
Sea Launch Receivables [Member]
Other Assets [Line Items]
Net receivable balance recorded in Other assets	356	$ 356
Sea Launch Receivables [Member] | S.P. Koroley Rocket And Space Corporation Energia [Member]
Other Assets [Line Items]
Net receivable balance recorded in Other assets	223
Sea Launch Receivables [Member] | PO Yuzhnoye Mashinostroitelny Zavod [Member]
Other Assets [Line Items]
Net receivable balance recorded in Other assets	89
Sea Launch Receivables [Member] | KB Yuzhnoye [Member]
Other Assets [Line Items]
Net receivable balance recorded in Other assets	$ 44