Derivatives - Not Designated (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
|
| Derivatives not designated as hedging instruments | ||||
| Gain (Loss) on Derivative Recognized in income | $ (111) | $ (132) | $ (91) | $ (91) |
| Foreign currency forward/option contracts | Cost of sales | ||||
| Derivatives not designated as hedging instruments | ||||
| Gain (Loss) on Derivative Recognized in income | 3 | 6 | 5 | |
| Foreign currency forward contracts | Interest expense. | ||||
| Derivatives not designated as hedging instruments | ||||
| Gain (Loss) on Derivative Recognized in income | $ (114) | $ (138) | $ (91) | $ (96) |