Derivatives and Hedging Activities - Summarization for Foreign Currency Forward Purchase and Sale Contracts (Details) - Foreign Exchange Forward $ in Millions	Dec. 31, 2018 USD ($)
Sell | Canadian dollars
Notional amount	$ 2
Sell | European euro
Notional amount	8
Sell | U.S. dollars
Notional amount	11
Purchase | European euro
Notional amount	1
Purchase | Polish zloty
Notional amount	35
Purchase | Mexican pesos
Notional amount	0
Purchase | U.S. dollars
Notional amount	$ 2