Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016	Dec. 31, 2016
Income Tax Contingency [Line Items]
Effective income tax rate	14.00%	21.00%
Reductions Credited To Income Tax Expense	$ 38
Unrecognized tax benefits	60		$ 63
Projected additions to unrecognized tax benefits	6
Unrecognized tax benefits that would affect the effective income tax rate	40
Tax-related interest and penalties accrual	20
Other current liabilities
Income Tax Contingency [Line Items]
Unrecognized tax benefits	$ 11