Contingent matters - Narrative (Details) $ in Millions |
Oct. 22, 2014
appeal
|
Sep. 17, 2014
USD ($)
|
Dec. 06, 2013
USD ($)
|
Oct. 28, 2010
USD ($)
|
|---|---|---|---|---|
| Loss Contingencies [Line Items] | ||||
| Damages awarded (less than) | $ | $ 1 | |||
| Litigation settlement amount | $ | $ (2) | $ 7 | ||
| Del Valle Gurria S.C. v. Servicio Pan Americano de Protección, S.A. de C.V | ||||
| Loss Contingencies [Line Items] | ||||
| Number of appeals | 2 | |||
| U.S. | Del Valle Gurria S.C. v. Servicio Pan Americano de Protección, S.A. de C.V | ||||
| Loss Contingencies [Line Items] | ||||
| Number of appeals | 1 | |||
| Mexico | Del Valle Gurria S.C. v. Servicio Pan Americano de Protección, S.A. de C.V | ||||
| Loss Contingencies [Line Items] | ||||
| Number of appeals | 1 |