Other Assets (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Other Assets [Line Items]
Net receivable balance recorded in Other assets	$ 1,444	$ 1,416
Spirit Aerosystems [Member]
Other Assets [Line Items]
Loss Contingency, Receivable	143	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	223
Sea Launch Receivables [Member] | PO Yuzhnoye Mashinostroitelny Zavod [Member]
Other Assets [Line Items]
Net receivable balance recorded in Other assets	89	89
Sea Launch Receivables [Member] | KB Yuzhnoye [Member]
Other Assets [Line Items]
Net receivable balance recorded in Other assets	44	44
Sea Launch Receivables [Member] | Bank Guarantees [Member]
Other Assets [Line Items]
Net receivable balance recorded in Other assets	147	147
Sea Launch Receivables [Member] | Partner Loans [Member]
Other Assets [Line Items]
Net receivable balance recorded in Other assets	$ 209	$ 209