Investigations, Claims and Litigation (Unaudited) (Details) € in Millions, BRL in Millions, $ in Millions	2 Months Ended	12 Months Ended	26 Months Ended		28 Months Ended
	Sep. 30, 2013 Defendant	Dec. 31, 2007 USD ($)	Sep. 30, 2015 BRL	Sep. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2015 EUR (€)	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)	May. 04, 2012 USD ($)
Loss Contingencies
Receivables, unpaid long-term contracts							$ 3,268	$ 2,806
Claims asserted, range of possible loss, maximum							794
United States Postal Service
Loss Contingencies
Claims asserted, range of possible loss, maximum							410
Solystic Matter [Member]
Loss Contingencies
Gain contingency, unrecorded amount						€ 31	$ 35
Loss Contingency, Damages Sought, Value			BRL 111	$ 27
Unpaid Portions of Contract Price and Direct Costs Incurred [Member] | United States Postal Service
Loss Contingencies
Receivables, unpaid long-term contracts									$ 63
Acts and Omissions with Adverse Affects on Performance and Obligations [Member] | United States Postal Service
Loss Contingencies
Gain contingency, unrecorded amount									$ 115
United States Postal Service
Loss Contingencies
Contract award		$ 875
United States Postal Service | False Claims Act | Threatened Litigation
Loss Contingencies
Loss Contingency, Damages Sought, Value					$ 179
Solystic Matter [Member] | Solystic Matter [Member]
Loss Contingencies
Loss Contingency, Number of Additional Defendants | Defendant	2
Initial Claim [Member] | Solystic Matter [Member]
Loss Contingencies
Loss Contingency, Damages Sought, Value			89	22
Incremental claim [Member] | Solystic Matter [Member]
Loss Contingencies
Loss Contingency, Damages Sought, Value			BRL 22	$ 5