Derivatives and Risk Management - Designated Hedge Gains (Losses) (Details) - Foreign currency exchange contract - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Derivative Instruments, Gain (Loss) [Line Items] | |||
| Gain (Loss) Reclassified from AOCI to Earnings | $ 1 | $ (3) | $ 10 |
| Gain (Loss) Recognized in Other Comprehensive Income (Loss) | $ 0 | $ 1 | $ (43) |