Investigations, Claims and Litigation Investigations, Claims and Litigation (Details) € in Millions, BRL in Millions, $ in Millions	2 Months Ended	12 Months Ended	51 Months Ended		53 Months Ended		55 Months Ended
	Sep. 30, 2013 Defendant	Dec. 31, 2007 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 BRL	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	May 04, 2012 USD ($)
Loss Contingencies [Line Items]
Receivables, unpaid long-term contracts			$ 3,976		$ 3,976		$ 3,976	$ 3,299
Solystic Matter [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value					33	BRL 111
Counterclaim			37	€ 31
Unpaid Portions of Contract Price and Direct Costs Incurred [Member] | United States Postal Service [Member]
Loss Contingencies [Line Items]
Receivables, unpaid long-term contracts									$ 63
Acts and Omissions with Adverse Affects on Performance and Obligations [Member] | United States Postal Service [Member]
Loss Contingencies [Line Items]
Gain Contingency, Unrecorded Amount									$ 115
United States Postal Service [Member]
Loss Contingencies [Line Items]
Contract award		$ 875
United States Postal Service [Member] | False Claims Act [Member] | Threatened Litigation [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value							179
Solystic Matter [Member] | Solystic Matter [Member]
Loss Contingencies [Line Items]
Loss Contingency, Number of Defendants | Defendant	2
Initial Claim [Member] | Solystic Matter [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value					27	89
Incremental claim [Member] | Solystic Matter [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value					7	BRL 22
Maximum | United States Postal Service [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss			$ 410		$ 410		$ 410