Other Financial Data - Other Current Assets (Details) - USD ($)	Mar. 30, 2019	Dec. 31, 2018
Other Current Assets [Abstract]
Current contract cost assets	$ 36,000,000	$ 30,000,000
Tax-related deposits	137,000,000	138,000,000
Other	191,000,000	186,000,000
Other current assets	$ 364,000,000	$ 354,000,000