Litigation, Investigations and Claims (Unaudited) (Details) (USD $) In Millions, unless otherwise specified					9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Solystic Matter [Member]	May 04, 2012 United States Postal Service	Sep. 30, 2013 Solystic Matter [Member] Defendant	Dec. 31, 2007 United States Postal Service	Sep. 30, 2013 United States Postal Service False Claims Act Threatened Litigation	Sep. 30, 2013 United States Postal Service FSS Main Case
Loss Contingencies
Contract award						$ 875
Receivables, unpaid long-term contracts	3,003	2,858		63
Gain contingency, unrecorded amount			42	115
Loss contingency, estimate of possible loss					$ 40		$ 179	$ 410
Loss Contingency, Number of Additional Defendants					2