Derivative Instruments - Location and Amounts of Pre-Tax Gains (Losses) on Cash Flow Hedges (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
---|---|---|---|---|
Sep. 30, 2018 |
Sep. 30, 2017 |
Sep. 30, 2018 |
Sep. 30, 2017 |
|
Derivative Instruments, Gain (Loss) [Line Items] | ||||
Gain (Loss) Recognized in Accumulated Other Comprehensive Loss (effective portion) | $ (4) | $ (4) | $ (8) | $ (7) |
Foreign exchange forward contracts | Designated as Hedging Instrument | Cash Flow Hedging | ||||
Derivative Instruments, Gain (Loss) [Line Items] | ||||
Gain (Loss) Recognized in Accumulated Other Comprehensive Loss (effective portion) | (3) | 3 | (6) | 2 |
Foreign exchange forward contracts | Revenue, Selling and general expenses | Designated as Hedging Instrument | Cash Flow Hedging | ||||
Derivative Instruments, Gain (Loss) [Line Items] | ||||
Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income (effective portion) | $ (2) | $ 2 | $ (3) | $ 6 |