Other Assets (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Other Assets [Line Items]
Net receivable balance recorded in Other assets	$ 1,488	$ 1,792
Sea Launch Receivables [Member]
Other Assets [Line Items]
Net receivable balance recorded in Other assets	356	356
Maximum exposure to loss	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
Sea Launch Receivables [Member] | Bank Guarantees [Member]
Other Assets [Line Items]
Net receivable balance recorded in Other assets	147
Maximum exposure to loss	147
Sea Launch Receivables [Member] | Partner Loans [Member]
Other Assets [Line Items]
Net receivable balance recorded in Other assets	209
Maximum exposure to loss	$ 209