Basis of Presentation (Details) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 29, 2019 USD ($) $ / shares	Jun. 30, 2018 USD ($) $ / shares	Jun. 29, 2019 USD ($) item $ / shares	Jun. 30, 2018 USD ($) $ / shares
Number of borrowing groups | item			2
Cumulative catch-up method
Cumulative catch-up adjustments	$ 27	$ 64	$ 58	$ 104
Change in accounting estimate financial effect increase in net income	$ 21	$ 49	$ 44	$ 79
Change in accounting estimate financial effect increase in earnings per share diluted | $ / shares	$ 0.09	$ 0.19	$ 0.19	$ 0.30
Gross favorable adjustments	$ 46	$ 70	$ 99	$ 126
Gross unfavorable adjustments	$ 19	$ 6	$ 41	$ 22