Commitments and Contingencies - Narrative (Details) € in Millions, $ in Millions	1 Months Ended	12 Months Ended
	Jul. 31, 2015 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 28, 2017 USD ($)	Dec. 28, 2017 EUR (€)	Feb. 03, 2017 USD ($)
Loss Contingencies [Line Items]
Settlement payments		$ 0	$ 0	$ 202
PacchiaCase
Loss Contingencies [Line Items]
Settlement payments	$ 202
French Tax Authority
Loss Contingencies [Line Items]
Total assessment, including penalties and interest, not recorded					$ 680	€ 571
Revolver
Loss Contingencies [Line Items]
Amount of letters of credit that can be issued under the Revolver		$ 50					$ 50