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Segment Information (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 segments	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Number of Reportable Segments	5us-gaap_NumberOfReportableSegments
Percent of operating assets located outside the United States	3.00%	3.00%
Earnings from operations associated with our cost and equity method investments	$ 287	$ 214	$ 268
Defense, Space & Security [Member] \| Network & Space Systems [Member]
Segment Reporting Information [Line Items]
Earnings from operations associated with our cost and equity method investments	229	203	196
Defense, Space & Security [Member] \| U S Government Contracts [Member] \| Sales [Member]
Segment Reporting Information [Line Items]
Entity-Wide Revenue, Major Customer, Percentage	30.00%	34.00%	33.00%
Commercial Airplanes [Member]
Segment Reporting Information [Line Items]
Earnings from operations associated with our cost and equity method investments	$ 58	$ 25	$ 77

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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