Investigations, Claims and Litigation Investigations, Claims and Litigation (Details) (USD $) In Millions, unless otherwise specified			0 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	May 04, 2012 United States Postal Service Claims [Member]	Dec. 31, 2012 United States Postal Service Claims [Member]	May 04, 2012 Unpaid Portions of Contract Price and Direct Costs Incurred [Member] United States Postal Service Claims [Member]	May 04, 2012 Acts and Omissions with Adverse Affects on Performance and Obligations [Member] United States Postal Service Claims [Member]
Loss Contingencies [Line Items]
Contract award			$ 875
Receivables, unpaid long-term contracts	2,858	2,964			63
Gain Contingency, Unrecorded Amount						115
Claims asserted, range of possible loss, maximum	$ 746			$ 410