Other Financial Data - Other Assets (Details) - USD ($)	Mar. 30, 2019	Dec. 31, 2018
Other Assets [Abstract]
Defined benefit plan assets	$ 152,000,000	$ 135,000,000
Tax receivable	39,000,000	39,000,000
Non-current contract cost assets	99,000,000	98,000,000
Other	67,000,000	72,000,000
Other assets, total	$ 357,000,000	$ 344,000,000