Derivative Instruments - Notional Values and Net Fair Value of Outstanding Contracts (Details) € in Millions, ¥ in Millions, ¥ in Millions, £ in Millions, kr in Millions, R$ in Millions, Kč in Millions, $ in Millions, $ in Millions, $ in Millions, $ in Millions, $ in Millions	Jun. 30, 2018 CZK (Kč)	Jun. 30, 2018 SEK (kr)	Jun. 30, 2018 USD ($)	Jun. 30, 2018 CAD ($)	Jun. 30, 2018 AUD ($)	Jun. 30, 2018 JPY (¥)	Jun. 30, 2018 GBP (£)	Jun. 30, 2018 MXN ($)	Jun. 30, 2018 CNY (¥)	Jun. 30, 2018 EUR (€)	Jun. 30, 2018 BRL (R$)	Jun. 30, 2018 SGD ($)	Dec. 31, 2017 CZK (Kč)	Dec. 31, 2017 SEK (kr)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CAD ($)	Dec. 31, 2017 AUD ($)	Dec. 31, 2017 JPY (¥)	Dec. 31, 2017 GBP (£)	Dec. 31, 2017 MXN ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 BRL (R$)	Dec. 31, 2017 SGD ($)
Derivative [Line Items]
Net fair value of asset (liability) of outstanding contracts | $			$ 1												$ (2)
Foreign Exchange Forward | U.S. dollar
Derivative [Line Items]
Notional balance of outstanding contracts	Kč 378	kr 14		$ 7	$ 50	¥ 144	£ 16	$ 127	¥ 44	€ 71	R$ 31	$ 6	Kč 361	kr 13		$ 12	$ 55	¥ 151	£ 13	$ 0	¥ 0	€ 108	R$ 34	$ 4
Foreign Exchange Forward | Euro
Derivative [Line Items]
Notional balance of outstanding contracts | £							£ 5												£ 5