Other Assets (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Other Assets [Line Items]
Net receivable balance recorded in Other assets	$ 1,328	$ 1,317
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
Maximum exposure to loss	147	147
Sea Launch Receivables [Member] | Partner Loans [Member]
Other Assets [Line Items]
Net receivable balance recorded in Other assets	209	209
Maximum exposure to loss	$ 209	$ 209